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1
Gqibityala, Akhona. "Farmers’ perception on factors influencing small-scale vegetable production at Tsengiwe village, South Africa." Thesis, Nelson Mandela Metropolitan University, 2017. http://hdl.handle.net/10948/15281.
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Food security and self-sufficiency in the rural areas has been and remains a major concern for the South African government. The study aimed to investigate farmer’s perception of factors influencing small-scale vegetable production in Tsengiwe village in the Eastern Cape. The research focus was on the following aspects that may have an influence on small-scale vegetable production: socio-economic factors, production and resource deficiencies and the impact of indigenous leafy vegetables. The researcher conducted several demonstration workshops during the field work. The pilot studies and community engagements were essential to extract knowledge systems embedded in the cultural traditions of indigenous or local communities. The action research was part of the reflective process of broadminded problem solving led by researcher and community. The research approach used a triangulation research method to extract information, whereby both quantitative and qualitative research was used to ensure greater accuracy. The main data collection was obtained from interviews with small-scale farming households in the Tsengiwe area. The study revealed that households were dependent on elderly female pensioners to source food and water. These women received most of their income from social grants and were mainly responsible for all farming activities in the households. Most households attempted to produce vegetables, although food security and self-sufficiency through own production was rarely achieved.Other perceived farming challenges included: lack of market accessibility, irrigation infrastructure, drought, financial limitations and soil degradation. Indigenous leafy vegetables were found to play a nutritional role in times of food shortage and not as much for their medicinal value. The study recommended the following interventions: Support for the elderly women in development and production practices, interventions to address factors affecting vegetable production, improving soil structure, working towards food self-sufficiency, moving away from dependence on mechanisation in rural farming.
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Anele, Mayekiso. "Production of Indigenous Leafy Vegetables (ILVs) and their contribution to household food security: evidence from Coffee Bay, Eastern Cape Province of South Africa." Thesis, University of Fort Hare, 2016. http://hdl.handle.net/10353/712.
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This study used cross-sectional survey data to estimate farmers` perceptions of, and commonly cultivated ILVs, factors that influence the participation of smallholder famers in the production of Indigenous Leafy Vegetables and its contribution to household food security]. With regard to farmers` perceptions of ILVs, descriptive results reveal that a majority of the people from the study area share positive perceptions with respect to ILVs. Regression estimates for determinants of participation indicate that the production of ILVs is primarily conditioned by shared perceptions and institutional factors rather than the socio-economic attributes of farmers. Public policies that address the institutional framework (extension, credit, market and social networks) in favour of ILVs are more likely to promote production. Also, more research on the documentation and benefits of ILVs, supported by investments targeting educational campaigns towards promoting positive attitudes and dispelling fears and myths surrounding ILVs, will further promote production. With reference to the contribution of ILVs to food security, descriptive results indicate that participation in the production of ILVs leads to a higher HDDS and a lower HFIAS. Regression estimates further revealed that participation positively contributes to a higher HDDS and a lower HFIAS, suggesting that households who participate in the production of ILVs are more likely to be food secure than non-participants. Therefore, participation in the production of ILVs has significant potential to address household food security.
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Sheldon, Bonita Joy. "Heavy metal uptake and accumulation in agricultural crops in urban areas of the Western Cape." Thesis, Cape Peninsula University of Technology, 2005. http://hdl.handle.net/20.500.11838/2006.
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Thesis (MTech (Physical Sciences))--Cape Peninsula University of Technology, 2005.A research study into heavy metals in the Cape Town area, found significant amounts of potentially toxic metals such as lead, cadmium, chromium and iron leaching into the underground aquifer. A further additional study conducted on a community garden in Khayelitsha, showed that vegetable crops have the tendency to accumulate certain heavy metals if they are present in soil and water resources. This study was centered around the Philippi Horticultural Area, which is a large significant farming area within the Cape Metropolitan Region. The significance of the study lies in the fact that at least 50% of the local farmers' produce is sold directly to street traders, residents, local supermarket-chains and restaurants. The remainder of the produce is sold at the Epping Market. The purpose of this study was to investigate heavy metal accumulation in various vegetable crop species taken from some of the local farms in the Phillipi Farming area with the objective to: • investigate heavy metal accumulation in various vegetable crop species taken from some local farms in the Phillipi Farming area. • determine the concentrations of heavy metals present in water and soil resource since these will be the primary source of heavy metals to the vegetables. • determine the soil pH and soil organic matter as these two factors would determine the bie-availability ofthe heavy metals. • identify those crops that pose a definite health risk by means of comparing the determined results to the allowed limits.
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Zitho, Andiswa. "A poverty alleviation strategy of Vukuzenzele gardening project in Motherwell township." Thesis, Nelson Mandela University, 2017. http://hdl.handle.net/10948/13724.
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Poverty is one of the issues that affects the development in our country. the strategies that are used differ from one to person to another. development is said to be measured through a lot of things but mostly through economic growth which influenced by poverty. the purpose of this study was to investigate the effectiveness of the strategies being used to alleviate poverty in the Motherwell township, in Port Elizabeth. The study focused mainly on Vukuzenzele gardening project, where a sample of 15 participants were purposovely selected to be part of the study. Furthermore, the aim of the study was to contribute towards community development by investigating the social issues that directly influence poverty eradication.
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Van, Averbeke W. "Urban farming in the informal settlements of Atteridgeville,Pretoria, South Africa." Water SA, 2007. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1000784.
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The objectives of the study were to provide quantitative information on the material benefits generated from urban farming
in order to assess the contribution of this activity to the food security and nutrition of participating households and to explore
the meaning of urban agriculture in the livelihood of participants. The study was conducted in five informal settlements of
Atteridgeville, Pretoria and involved a pilot study, a household survey and multiple case studies using participants in the different
types of urban farming projects as units of data collection and analysis. More than half of the households in the study
area participated in urban farming which consisted of home gardening, group gardening and dryland farming in open urban
spaces. Active participation was predominantly by women. The contribution to total household income and food security of
the different types of farming found in the study area was generally modest but the livelihood benefits derived from urban
farming extended far beyond material gain, reducing social alienation and the disintegration of families associated with urban
poverty. Lack of space and limited access to water for irrigation were the main constraints that affected participants in urban farming.
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Monaren, Nomfundo Nadine. "An economic overview of the baby vegetable industry in South Africa." Diss., University of Pretoria, 2013. http://hdl.handle.net/2263/24533.
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The study investigated and analysed the baby vegetable industry in South Africa in order to understand the profile, extent and economics of the industry. The study was conducted in the Mpumalanga, Gauteng, Limpopo and the Western Cape Provinces. Four baby vegetable categories were selected namely, baby carrots, baby sweet corn, baby gems and baby marrows and enterprise budgets for these baby vegetables were developed. Baby vegetables are unique produce trading at a premium price to traditional vegetables. Unlike traditional vegetables, baby vegetables are not produced in large quantities in South Africa as only few producers are producing them on a scale smaller than traditional vegetables. Since it is such a small industry very little is known about the production, distribution and the marketing of baby vegetables, both in South Africa and in the export market. Thus the size, volumes, economics of production, distribution and marketing channels as well as the export market of the baby vegetable industry are not known. This is because research on baby vegetables is limited as data for these vegetables is not readily available and accessible. The cost involved in producing the four baby vegetables was also determined through the development of their enterprise budgets and labour costs were found to be the highest cost of production. The enterprise budgets developed are expected to assist farmers when planning and making production decisions as well as projecting future yields and cost of production. The study ascertained that the supply chain for baby vegetables in South Africa is comprised of baby vegetable producers, staging companies, distribution centres, and the different markets. Markets for baby vegetables in South Africa consist of food retail outlets, fresh produce markets, fresh fruit and vegetable outlets, individual agents and the export market. Baby vegetables are also exported from South Africa. Europe is the largest market for South African baby vegetable exports. However, African countries such as Kenya, Zambia and Zimbabwe are also major role players in baby vegetable exports to the European market, followed by Swaziland. When compared to these countries, South Africa is not a major producer and exporter of baby vegetables. The baby vegetable industry according to the study, is a competitive industry and the continuation of supply by all supply chain members is determined by adhering to set standards, which requires the supply of high quality produce which is safe for consumption and is traceable. In the South African market, also referred to as the domestic market, food retail outlets have high standards of food quality and food safety that producers must adhere to. In the export market, standards are set and monitored by the Department of Agriculture, Forestry and Fisheries and import agents and these standards include Global Good Agricultural Practices (GlobalGAP) and sanitary and phytosanitary (SPS) measures. Further research into the baby vegetable industry is essential in order to know the size of the industry, the volumes of baby vegetables produced and the farm-to-retail price spreads within the industry, and to develop enterprise budgets that are representative of the baby vegetable industry. Since the data for baby vegetable production and sales are currently combined with those for traditional vegetables, it is important to document the industry separately.Dissertation (MCom)--University of Pretoria, 2013.
Agricultural Economics, Extension and Rural Development
unrestricted
7
Smith, Allister John. "A study of export performance as related to Cape vegetable producers." Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/52708.
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Thesis (MBA)--Stellenbosch University, 2002.ENGLISH ABSTRACT: The aim of this study is to define export performance and to identify factors which influence or improve export performance. There is a considerable lack of coherence among scholars on what export performance is; from whose viewpoint to measure it, namely the government, the company, the product or the specific market exported to and the time frame. A variety of factors was found to influence export performance positively and these are tested on a Cape Town based pumpkin exporter. It was concluded that net profit is the only consistently valid measure of export performance .. To achieve success in exports require the expertise of overseas distributors and agents as well as a world-oriented approach where delivery and services is important. When exporting a perishable agricultural product it is important to compete on superior quality and to concentrate on a few major markets. Success in any export venture depends primarily on top-management commitment, management being prepared to endure setbacks in order to become successful and channelling its attitude towards risk-taking into positively influencing export performarice.
AFRIKAANSE OPSOMMING: Die doel van hierdie studie is om uitvoerprestasie te meet en die faktore wat uitvoerprestasie bepaal, te identifiseer. Daar is teenstrydigheid tussen navorsers oor presies wat uitvoerprestasie is, asook die uitgangspunt vanwaar dit gemeet word, naamlik die regering, die maatskappy, die produk, die spesifieke mark waarheen uitgevoer word en die tydraam. 'n Verskeidenheid faktore is geïdentifiseer wat uitvoerprestasie positief beïnvloed en dit word getoets op 'n Kaapstadse pampoenuitvoerder. Daar is gevind dat nettowins die enigste betroubare en geldige maatstaf is om uitvoerprestasie te meet. Die gebruik van oorsese verspreiders en agente, asook 'n wêreld-georiënteerde benadering van lewering en diens is belangrik vir suksesvolle uitvoere. Wanneer 'n bederfbare landbouproduk uitgevoer word, is dit belangrik om mee te ding op grond van voortreflike diens en deur te konsentreer op 'n paar hoofmarkte. Sukses in enige uitvoerprojek hang hoofsaaklik af van die toewyding van topbestuur, of bestuur bereid is om terugslae te verduur ten einde suksesvol te raak en deurdat bestuur sy benadering jeens risiko in die regte rigting kanaliseer ten einde uitvoere positief te beïnvloed.
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Khapayi, Musa. "Agribusiness challenges to effectiveness of contract farming in commercialisation of small-scale vegetable farmers." Thesis, Nelson Mandela University, 2017. http://hdl.handle.net/10948/13981.
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The spread of contract farming in South Africa in recent years has provoked an ideological debate in literature. Linking small-scale vegetable farmers with lucrative agricultural markets through agribusiness value chains is seen as one of the foremost emerging agricultural practices to develop the subsistence farming sector into a mainstream economic sector – thereby revitalising the rural economy and alleviating poverty levels in the developing rural areas of South Africa. However, the challenges agribusiness and small-scale farmers experience in contract farming engagement and the prospects for enhancing the inclusion of small-scale farmers into modern value chains remain open to debate – two decades after transition to democracy. Yet the factors and mechanisms influencing the effective application of contract farming in the transition to commercial farming by small-scale farmers have not been thoroughly explored in South African research. Despite the efforts and the substantial investments made and the various policies and initiatives instigated to fast-track the linkages of small-scale farmers into high-value markets, the success stories of previously disadvantaged farmers operating in commercial agri-food chains are rare. Given the millions of small-scale farmers in former homelands alone, the negligible number of small-scale farmers successfully operating in commercial agri-food chains shows that the objectives to enable small-scale farmers to improve their livelihoods through participation in commercial agri-food chains have not yet been met. The broad objectives of the study were therefore to investigate the agribusiness challenges inherent in contract farming and the conditions and incentives required by agribusiness firms to engage small-scale vegetable farmers in contract farming programmes. Furthermore, the study examined the role played by the South African government to reduce the high transaction costs incurred by agribusinesses when engaging small-scale farmers in contractual arrangements. The Amathole and Sarah Baartman (formerly Cacadu) district municipalities in the Eastern Cape Province of South Africa were chosen as the composite survey area for this study. A predominantly qualitative research approach was applied to gather data on the phenomena under study. The following methodologies and research instruments and tools were selected. Firstly – as the secondary component of the research – a systematic review of literature to date was conducted to guide the empirical research and primary methodology. Secondly, the empirical component of the study comprised a questionnaire survey, unstructured interviews and focus group discussions. The questionnaire survey was used to collect data from the agribusiness firms in the area surveyed concerning the following aspects: the significant determinants of contract farming, the incentives required by the agribusiness firms to engage small-scale vegetable farmers in their contract farming programmes and the challenges faced by agribusiness firms in their interaction with small-scale farmers in contractual arrangements. Unstructured interviews were used to gather data from officials at each of the three levels of government – the Department of Rural Development and Land Reform nationally, Department of Agriculture and Land Reform provincially and (at local government level) two district municipalities – on the role played by government to reduce the high transaction costs incurred by agri-firms when procuring agricultural raw materials from small-scale vegetable farmers. Focus group discussions were conducted with small-scale farmers regarding their perspective on working with agribusiness firms and to establish the distinguishing characteristics of small-scale farmers in the area surveyed. Relevant policy documents collected from two of the three representative groups of the study population, i.e. agribusiness personnel and government officials, provided the essential context. The study revealed a limited number of contract farming business linkages between small-scale vegetable farmers and agribusiness firms in the survey area. Those that do exist are problematic to both the agribusiness firms and the small-scale farmers. It emerged that the contract farming environment in the area surveyed is highly polarised and characterised by a fundamental conflict of interest between agribusiness and farmer. Among the divergent key factors inhibiting contract farming engagement were a lack in terms of quality seeds, trust, entrepreneurial skills and formal contract agreements. Asset endowment (both land and non-land assets) was found to be significant pre-selection determinants in the farmer’s capacity to be contracted. Access to innovative technology, as well as government incentives such as production inputs, were found to be critical to agribusiness firms to engage smallscale farmers in their contract farming programmes. Government assistance in terms of high transaction costs to agribusiness firms working with large groups of small-scale farmers was found to be essential but inadequate under current policy. This impacts directly on the effectiveness and promotion of contract farming. Furthermore, the current results corroborate the findings of numerous South African studies in the vast body of worldwide research. Firstly, lack of land and non-land assets continue to be major impediments to the direct participa-tion of small-scale farmers in contract farming programmes and, secondly, the transaction and market information costs incurred by agribusiness prevent the participation of less endowed farmers in contract farming programmes. Conducted within the interpretivist paradigm, the explorative research identified wide-ranging challenges in the relationship between agri-business and small-scale farmers which directly impact the effective-ness of contract farming as a development and agrarian reform strategy. Despite their problematic relationship, however, agribusiness and small-scale contract farmers were in agreement that the government needs to expand its support for agri-firms to incentivise greater numbers of small-scale farmers having the opportunity to achieve commercial status through contract farming. The study therefore recommends a collaborative partnership between private firms and government, with state support through revised policies and development programmes. These amendments are crucial to enhancing the engagement of small-scale vegetable farmers in lucrative agri-food chains.
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Sowunmi, Linda Ifeanyichukwu. "Nutritional value and cultivation requirements of Cleome Gynandra: a wild vegetable growing in the Eastern Cape Province, South Africa." Thesis, University of Fort Hare, 2015. http://hdl.handle.net/10353/2600.
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South Africa has wide ranges of plants among which are leafy vegetables growing in the wild. These wild vegetables have been reported to have high nutritive and medicinal potentials. Yet, there is still high prevalence of malnutrition and micronutrients deficiencies among the low income bracket of the population. Effective utilization of wild vegetables has been proposed as part of the solutions to address the problem of dietary deficiencies among the populace. Their importance is mainly as relish to accompany and complement starch based diets. They are also known to serve as supplements for food which have the potential to improve the health status of its consumers in many rural communities. Cleome gynandra L. (Capparaceae) is one of the underutilized species mentioned during asurvey conducted in Nkonkobe municipality of the Eastern Cape Province, South Africa. The plant is an erect annual herb with alternate, palmately compound leaves and its petals are white, pink or lilac. It grows as a weed in this part of the Province and is usually gathered from the wild for food and medicine. It is commonly found on wastes land, road sides and on grass lands. Therefore, this research work was designed to contribute to the possible domestication of this wild vegetable in order to explore the nutritive and therapeutic potentials which would broaden the food base in the Eastern Cape Province. The ultra-micromorphological features of plants have become an essential tool in proper identification and authentication of several plant species. In the light of this, the micromorphology of Cleome gynandra was examined to reveal the micro-morphological characters of the plantand to determine if micro and macro mineral elements are present using energy dispersive x-rays. The present study revealed the epidermal cells of the leaves to be asymmetric in shape with undulating cell walls having four subsidiary cells around the stomata. The leaves have anomocyctic stomata which are more distributed in the abaxial surface than the adaxial surface. The mean length and width of the guard cells in the abaxial surface are 0.09 ± 0.01 mm and 0.08 ± 0.01 mm respectively while that of adaxial surface are 0.1± 0.01 mm and 0.07 ± 0.01 mm respectively. The energy dispersive x-rays (EDXS) micro-analysis of the leaf revealed the presence of phosphorus, manganese, iron, calcium, sodium, magnesium, potassium and zinc as the major constituents of the crystal deposits present in the stomata pores and the mesophyll. C. gynandra was collected from the wild and analysed for its mineral and proximatecomposition using standard analytical methods. The plant showed high levels of sodium, iron, zinc, calcium and potassium while many other macro and micro minerals were moderately present. Amongst the proximate factors investigated, moisture content was found to be 82.1% while crude fibre and protein contents were 39.9 percent and 31.03 percent respectively. Vitamin C was also high (345.3 mg/100g). The anti-nutrients compositions revealed low concentrations of oxalate (7.4 ± 0.4) and phytate (0.6 ± 0.0) mg/100g. The study revealed high nutritive value of the species growing naturally from the wild. Interest in the phenolic compounds has greatly increased recently because these compounds have been implicated in suppressing the risk of degenerative diseases in humans. The pharmacological properties of plants may be related to their antioxidant capacities and hence there was need to investigate the antioxidant potential using aqueous, ethanolic and acetone extracts of different parts of C. gynandra. The quantities of phenols, flavonoids and flavonols were significantly higher (p < 0.05) in both aqueous and ethanol extracts of the leaf while the concentration of proanthocyanidins was higher in the aqueous stem extract compared to other plant parts. The aqueous extract of the different parts exhibited better ABTS, reducing power and NO radical scavenging abilities than ethanol extract.
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Mahlangu, Sandile Alexandra. "Production and commercialisation potential of indigenous leafy vegetables : case study of Capricorn District in the Limpopo Province, South Africa." Thesis, University of Limpopo, 2014. http://hdl.handle.net/10386/1332.
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Thesis (MSc. (Agricultural Economics)) -- University of Limpopo, 2014There are few plant species commercialised significantly globally and food requirements are mainly met by only few species. However, there is an enormous number of under-utilised species that play a vital role in the livelihood of rural households. These species are referred to as indigenous crops. Indigenous crops are adaptable to local agro-ecological conditions even where there is unreliable rainfall, which is the case in many parts of the country, require a minimum production management, mature early, and are easy to harvest and preserve and require less capital investments. Despite all these, in South Africa indigenous leafy vegetables (ILVs) were not commercialised and most researchers did not pay much attention to do research on possibilities of commercialising these crops. Thus this study investigated the economic potential of commercialising indigenous leafy vegetables in the rural South African context in general and in the study area in particular. The objectives of the study were (1) to identify the socio-economic characteristics of ILVs producers in rural areas of Capricorn district, (2), to investigate constraints faced by farmers in commercialising ILVs in rural areas of Capricorn district, (3), to determine the productivity of indigenous leafy vegetables in rural areas of Capricorn district, and (4), to assess different types of marketing channels of ILVs in rural areas of Capricorn district. The study used Stochastic Frontier Production Function to determine the productivity and to assess the socio-economic characteristics of producers of Indigenous Leafy Vegetables. Bubble chart was used to assess the marketing channels whilst consumer data was captured into a statistical package. The results indicated that there are several significant socio-economic factors that affect ILV production and there are also factors which constraint farmers from commercialising ILVs. Productivity of ILVs in the study area varied a lot among farmers; some farmers had a high productivity but most farmers had a low productivity. The results indicated that out of the factors included in the analysis significant production factors were; amount of labour used, cost of hiring tractor service and land devoted to ILVs and inefficiency factors were; gender, age, household size, farming experience, farm size, v hired labour, primary occupation and land ownership. ILV farmers had no formal marketing channels; they sold their product direct to consumers or through hawkers. Therefore, the study recommends the integration of science/modern technology and indigenous knowledge, to improve the productivity of ILVs. Since farmers were not technically efficient, therefore it is important to run workshops that will help them improve their production and marketing skills and how to market their products. Or create booklets that have information on how to efficiently produce ILVs. There should also be awareness campaign on the benefit of ILVs in both rural and urban communities. The study also recommends a multi-disciplinary approach in developing the crop; more stakeholders should be involved so as to make the crop appealing. Finally the study recommends the commercialisation of these crops due to the fact that they have the potential and are demanded in most parts of South Africa.
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Munyai, Keneilwe. "Small-scale sustainable vegetable-tanned leather in rural South Africa: a collective-efficiency approach." Thesis, Cape Peninsula University of Technology, 2014. http://hdl.handle.net/20.500.11838/1338.
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Thesis submitted in fulfilment of the requirements for the degree:
Doctor of Technology: DESIGN
In the Faculty of Informatics and Design
At the Cape Peninsula University of TechnologyCurrently, the South African leather tanning industry is dominated by chromium tanning which has been identified as highly polluting. Vegetable tanning is considered less environmentally hazardous. Yet, there have been no plans to promote it in South Africa. Vegetable tanning process utilises vegetable matter for converting animal skins or hides into pliable material that is known as leather. South Africa has a variety of plants that produce tannins. However, the focus of this study is on the mimosa locally known as black wattle (Arcacia miernsii). Furthermore, the South African vegetable tanning sector has been left behind in terms of research and development despite the country being endowed with the Mimosa plant that is widely used in the vegetable tanning process. The country is also endowed with surplus labour which can be absorbed by the leather industry which is labour intensive.
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Wilson, Gayle Pamela. "Optimisation of an in vitro model for anti-diabetic screening." Thesis, Nelson Mandela Metropolitan University, 2006. http://hdl.handle.net/10948/428.
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The need for alternative strategies for the prevention and treatment of diabetes is growing rapidly as type II diabetes is reaching epidemic status in our society. This need was the basis for the creation of this study, as it was necessary to start looking towards medicinal plants as potential antidiabetic treatment and no comprehensive in vitro model existed. In creating a model for determining the effects of alternative traditional medicines as antidiabetic potentiates, it was necessary that two metabolic pathways, namely glucose uptake and insulin secretion, which play a significant role in glucose homeostasis, be at the centre of our investigations. The objective of this project was to optimize the methodology required to screen and ultimately determine the effectiveness of the plant extracts Kankerbos and MRC2003, as antidiabetic potentiates, through observing their effects on glucose utilisation and insulin secretion. If these medicinal plants are going to make a positive contribution to the health of type II diabetic South Africans, then the determination of their efficacy is essential. The cell lines used in this study included 3T3-L1 preadipocytes, Chang liver, C2C12 muscle and INS-1 rat pancreatic cells. Each cell line represents a different in vivo organ that is known to have an influence on glucose homeostasis in our bodies, each with its own unique metabolic pathways and mechanisms of activity, thereby making each one a vital component in the study. The positive controls for the two models were insulin and metformin (glucose utilisation) and glibenclamide (insulin secretion). Insulin was shown to provide a significant increase in the amount of glucose taken up in C2C12 muscle and Chang liver cells for acute conditions. Chronic treatments with metformin provided a significant increase in glucose utilised by Chang liver cells. Glibenclamide was an effective positive control for stimulating insulin secretion by INS-1 cells under acute conditions as there was a significant increase in the amount of insulin secreted. MRC2003 did not show any significant antidiabetic activity. Sutherlandia frutescens (Kankerbos) showed biological activities comparable to some of the more recognized antidiabetic compounds throughout the study. With regards to the glucose utilisation model, Kankerbos was seen to have both acute and chronic effects in different cell lines. In the C2C12 muscle cell line, Kankerbos significantly increased glucose uptake when they were exposed to acute conditions. Kankerbos also had a significant effect on the Chang liver cells as it was observed that under both acute and chronic conditions, this plant extract induced the uptake of glucose into these cells. With respect to the insulin secretion model involving INS-1 cells, no significant effect was seen during acute exposure with Kankerbos treatment. However during chronic exposure, an increase in insulin secretion was initiated by this plant extract. Overall, the results of this study suggest that Kankerbos has a twofold mechanism of action for its glucose-lowering effects. Given that Kankerbos is widely available in South Africa, this study was valuable as it provided an indication that Kankerbos has antidiabetic activities and could possibly be used as an alternative antidiabetic medication.
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Naude, Celeste. "Fruit and vegetable consumption by South African children, aged 12 to 108 months : a secondary analysis of the National Food Consumption Survey data." Thesis, Stellenbosch : University of Stellenbosch, 2007. http://hdl.handle.net/10019.1/2251.
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Thesis (MNutr (Human Nutrition))--Stellenbosch University, 2007.INTRODUCTION: Epidemiologic research strongly supports the importance of adequate fruit and vegetable intake for the promotion of human health and the prevention of chronic disease. Data suggest that fruit and vegetable consumption in children may protect against an array of childhood illnesses. Low fruit and vegetable intake has been recognized as a key contributor to micronutrient deficiencies in developing countries. Evidence indicates that fruit and vegetable consumption is inadequate in both developed and developing nations. A paucity of data on fruit and vegetable consumption exists in South Africa. Quantification of fruit and vegetable consumption is important for the worldwide drive to increase consumption and for strategy development to address inadequate consumption. METHODS: A secondary analysis of the dietary intake data (24 hour recall questionnaire (24-H-RQ) and quantified food frequency questionnaire (QFFQ)), collected during the 1999 National Food Consumption Survey (NFCS) in 12 – 108 month old children in South Africa, was conducted to ...
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Bosch, Janine. "Production of biologically active recombinant HIV-1 protease and intehrase for the purpose of screening medicianl plant extracts." Thesis, Nelson Mandela Metropolitan University, 2009. http://hdl.handle.net/10948/1056.
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Human immunodeficiency virus (HIV) and its gradual weakening of the immune system is an ever growing threat. Acquired immune deficiency syndrome (AIDS), the final stage of HIV, renders a person vulnerable to various opportunistic infections, which in the end lead to death. Apart from intensive vaccine studies, treatment research mainly focuses on preventing the individual HIV enzymes (reverse transcriptase, integrase and protease) from performing their functions. Entry inhibitors, however, block viral entry into the cell, while antisense drugs lock onto the viral genome to keep it from functioning. In this study production of active recombinant HIV-1 protease and integrase was attempted for future drug screening programs. HIV-1 protease was cloned into a pET28b(+) vector and expressed in ROSETTA(DE3)pLysS cells. The protein was purified using a nickel-affinity column utilizing the hexa-histidine tag encoded by the vector. Gel filtration chromatography was attempted after refolding of the protease, but protease yield seemed to decrease with the additional purification step. Partially purified protease was characterized with kinetic studies. Kinetic parameters of HIV-1 protease were determined to be Km = 592 μM, Vmax = 0.59 μM/min and kcat = 31 s-1. HIV-1 integrase, which was cloned into a pET15b vector, was expressed in E. coli BL21(DE3) cells. The coding sequence had been mutated to introduce the amino acid substitutions F185K and C280S, increasing solubility of the protein. The first step in purification of this protein was nickel-affinity chromatography, after which cation exchange chromatography was attempted. HIV-1 integrase concentration was low throughout experiments and no clear elution from the cation exchange column could be observed. A non-radioactive enzyme linked HIV-1 integrase assay failed to detect integrase activity. Modifications to future studies of the integrase are suggested in the chapter involved.
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Harnett, Siobhán Margaret. "In vitro anti-HIV activities of Sutherlandia frutescens and Lobostemon trigonum extracts." Thesis, University of Port Elizabeth, 2004. http://hdl.handle.net/10948/347.
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Currently, the approved anti-HIV drugs on the market only target the three HIV enzymes: reverse transcriptase, protease and more recently, integrase. Due to the limited nature of the current therapy, it is possible that a multi-drug resistant virus can emerge. The main concerns in developing countries however, are the expense and availability of the drugs and because of this, it is essential to investigate all alternatives. Traditional medicine offers many advantages as compared to allopathic treatment in so far as being relatively cheaper, accessible and it is broadly accepted in the population groups of the developing countries. Little is known though, of the exact efficacy and toxicity of these remedies so it is vital that these possible leads be investigated thoroughly. For the purpose of this study, two plants, Sutherlandia frutescens and Lobostemon trigonum were studied to ascertain their potential anti-HIV activity. Sutherlandia has received international attention as a possible cheap herbal remedy to improve the health of AIDS sufferers. Anecdotal evidence from health workers claim that HIV- infected patients on Sutherlandia treatment have shown improved CD4 counts, decreased viral loads and a general improvement in well-being. Extracts were prepared from dried leaves and flowers in methanol, ethanol, acetone, methylene dichloride or distilled water. Sulphated polysaccharides have been described extensively in literature with regards to their anti-HIV activity, so as a form of dereplication; an ethanol precipitation was performed on the aqueous extracts to remove sulphated polysaccharides. A toxicity study was performed on all crude extracts using uninfected peripheral mononuclear blood cells (PBMCs) isolated from whole blood. To measure anti-HIV activity, HIV-infected PBMCs were cultured with each of the crude extracts and cell viability measured using the tetrazolium salt, XTT. HIV-infected CEM-NKR-CCR5 cells were also used and supernatant from the viral studies was tested for the HIV antigen p24. xii Results varied greatly between assays but with the inclusion of a point-scale system to evaluate the extracts it was clear that overall the organic extracts of the Sutherlandia flowers, especially the acetone extract (SFA), showed great anti-HIV potential. SFA in every case decreased p24 levels and in the toxicity study did not decrease cell proliferation. With the HIV-infected PBMCs SFA actually helped improve cell proliferation despite the infection. To determine the specific anti- HIV activity, all crude extracts were tested for inhibition of HIV-I reverse transcriptase, the glycohydrolase enzymes: a-glucosidase, ß-glucosidase, ßglucuronidase, HIV-I integrase and HIV-II protease. No significant inhibition was seen with these experiments except for the HIV-I RT assay. The aqueous extract of the Lobostemon leaves produced an inhibitor of HIV-RT with a very low IC50 value of 0.049mg/ml. Some inhibitory effect was lost with the removal of the sulphated polysaccharides and the addition of BSA to the assay, but still 64% inhibition of the HIVRT remained, which confirmed that the inhibitor could be something novel, and not of the polysaccharide or tannin compounds.
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Madlodlo, Sinazo. "Technical and institutional constraints faced by vegetable co-operatives in the Buffalo City Metropolitan Municipality in Eastern Cape Province, South Africa." Thesis, University of Fort Hare, 2016. http://hdl.handle.net/10353/1497.
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This study focused on the technical and institutional constraints faced by the vegetable co-operatives with regard to the impact on productivity. Vegetable co-operatives have no access to markets due to their poor performance on productivity and poor quality produce resulting to low prices for the produce such that they cannot compete in a market economy. In this study, the data was drawn from a sample of thirty vegetable co-operatives in the Buffalo City Metropolitan Municipality (BCMM) of the Eastern Cape; obtained through focus group discussions and interviews from each cooperative. The objectives of the study are to measure the productivity of vegetable co-operatives using Total factor productivity analysis (TFP) and profitability of vegetable co-operative using Gross Margin (GM). Followed by the descriptive statistics in identifying and assessing the socio-economic characteristics as well as coping strategies adopted by vegetable co-operatives in BCMM where percentages, means and tables are used looking at the highest frequency. The results show that the vegetable co-operatives in the BCMM are not productive and profitable due to major constraints experienced by co-operatives such as lack of market, information, trainings and business skills, capital, infrastructural facilities, effective extension services that all leads to poor produce quality. Co-operative is said to be profitable and viable if total revenue is greater than the total variable cost which makes the gross margin positive. In this case, the total gross margin is negative. The results showed that the production costs, maintenance (tractor hire, generator hire and servicing) and electricity costs were the major costs incurred in the production of vegetable by the co-operatives.
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Jacobs, Cindy. "The role of social capital in the creation of sustainable livelihoods : a case study of the Siyazama Community Allotment Gardening Association (SCAGA)." Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/2336.
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Thesis (MPhil (Sociology and Social Anthropology))--University of Stellenbosch, 2009.Cape Town’s growing economy has benefited greatly from its natural resources. The city boasts the unique Table Mountain; Blue Flag beaches; and the distinctive fynbos of the Cape Floral Kingdom, all of which have contributed considerably to the revenue generated by the tourism industry. Even though the city’s economy appears robust, many people living in townships on the Cape Flats continue to face a reality of being trapped in a state of deprivation; unable to access those natural resources as a means to make a living; and unable to cope with shocks, trends and seasonality in a dynamic, vulnerable society plagued by inequitable distribution of wealth and environmental degradation. Yet, while access to financial, natural (and other) assets is limited, poor people can rely upon their social assets – or Social Capital (SC) in order to make a living. This case study explores the three types of Social Capital – (i) Bonding SC (between project beneficiaries), (ii) Bridging SC (between project beneficiaries and implementing agents) and (iii) Linking SC (between implementing agents and local government organs) – in an attempt to understand their impact on the livelihoods of project beneficiaries involved in the Khayelitsha-based Siyazama Community Allotment Gardening Association (SCAGA). This was done with the purpose of enabling development practitioners, government officials and local people to work together to plan sustainable initiatives that enhance peoples’ quality of life. Although case studies have been criticised by some authors as lacking scientific rigor and do not address generalisability, this study employed a case study approach due to its appropriateness when dealing with a small number of participants and the specific context of their complex real-life activities in great depth. By taking a post-positivistic stance, the researcher was able to appreciate the different constructions and meanings that people place upon their life experiences.
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Kabatende, Joseph. "Pharmacological evaluation of some central nervous system effects of Cotyledon Orbiculata." Thesis, University of the Western Cape, 2005. http://etd.uwc.ac.za/index.php?module=etd&.
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The use of traditional medicine through the use of medicinal plants in Africa and especially in South Africa has long been considered an important characteristic of people's daily lives and socio-cultural heritage. Cotyledon Orbiculata is among the medicinal plants that are used by South African traditional practitioners for the treatment of epilepsy and painful conditions such as corns, warts, toothache, earache, boils and various other ailments. However, the claim of therapeutic successes of medicinal plants by traditional medicine practitioners are hardly subjected to scientific scrutiny. This study therefore, investigated the anti-epileptic property of Cotyledon Orbiculata by studying the effects of the methanol extract of the plant against chemically induced seizures by pentylenetetrazole, picrotoxin, bicuculline and N-methyl-DL-aspartic acid in mice. The study also investigated the analgestic effects of Cotyledon Orbiculata by studying the effect of the plant extract on pain induced by acetic acid and hot plate thermal stimulation.
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De, Witt Christelle. "The development of a strategy to promote fruit and vegetable consumption in South Africa / Christelle de Witt." Thesis, North-West University, 2005. http://hdl.handle.net/10394/945.
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The theory is that increased intake of fruit and vegetables will address both under nutrition and
over nutrition, which are both apparent in South Africa. Because of the nutrition transition evident in South
Africa, which goes hand in hand with the increased prevalence of non-communicable diseases (NCDs), the
focus in this dissertation is on over nutrition, hence addressing the problem of NCDs in South Africa.
In the Global Strategy on Diet, Physical Activity and Health developed by the World Health Organization
(WHO) and endorsed by the May 2004 World Health Assembly, the increase of fruit and vegetable
consumption is one of the recommendations to reduce the risk factors for NCDs. In September 2004, a
joint Food and Agricultural Organization (FA0)MIHO workshop addressed the need for a global increased
fruit and vegetable consumption. The workshop resulted in a framework that will guide the development
of interventions for the promotion of adequate consumption of fruit and vegetables at national level.
Non-communicable diseases were the number one cause of death in South Africa in the year 2000 and
accounted for 37% of the deaths. Fruit and vegetable intake has been shown to reduce the risk for
cardiovascular diseases, diabetes and cancer. However, overall intakes of fruit and vegetables for South
Africans cannot be regarded as meeting the recommendation of five portions daily.
The low fruit and vegetable consumption patterns of South Africans resulted in the need to adopt a
national framework sensitive to the present situation by using the above-mentioned framework as
reference.
As starting point, a review of available literature regarding South African eating patterns was used to
characterise the fruit and vegetable consumer domains and their corresponding supply networks and to
identify barriers to eating fruit and vegetables. The consumer domains in South Africa are characterised
as follows: (i) rural small-holders producing fruit and vegetables for own consumption; (ii) market dependent
consumers; (iii) mixed consumers; and (iv) institutional consumers. The most commonly
perceived barriers to eating fruit and vegetables are affordability, availability and household taste
preference.
The recommended national goal for fruit and vegetable consumption is five portions a day. Possible
stakeholders involved in reaching this goal primarily fall under four sectors namely, the public sector,
private sector, non-governmental organisations and international stakeholders. There is an opportunity to
revise existing national policies and programmes that do not consider fruit and vegetables for example
specifying the amount of fruit and vegetables to be mandatory in the Primary School Nutrition Programme
(PSNP).
The way forward would be to involve a broader stakeholder participation especially at regulatory and
government level to create a national coordinating team. It is suggested that the 5-A-Day for Better Health
Trust be the driving force of the whole process. It, however, needs to be capacitated further with regard to
the generation of funds and expansion of the Board of Trustees and objectives. Discussions should be
held with the WHO to hold an implementation workshop with regard to the suggested framework for
increasing fruit and vegetable consumption in South Africa with the national coordinating team and the
most important stakeholders. Specific short-term, medium-term and long-term objectives should be set for
the team.
The national coordinating team would provide leadership at national level by inter alia developing
sustainable and cost-effective interventions through applying the proposed framework, whilst focusing on
the most vulnerable target groups. From the planning to the implementation of projects, programmes and
interventions, the evaluation of processes and outcomes should be of high importance. The evaluation
and monitoring of interventions are a continuous process and invaluable to ascertain the progress made,
whether the target group has been reached and/or whether the intervention has been successful.Thesis (M.Sc. (Nutrition))--North-West University, Potchefstroom Campus, 2005.
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Mohlakoana, Keneuoe. "Antimicrobial activity of selected Eastern Cape medical plants." Thesis, Nelson Mandela Metropolitan University, 2010. http://hdl.handle.net/10948/1199.
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Bacterial resistance to antibiotics has been a great problem for many years. The degree of resistance and the speed with which resistance develops varies with different organisms and different drugs. Enzymes called β-lactamases are produced by bacteria and are one mechanism in which bacteria develop antimicrobial resistance. Gram-negative bacteria producing enzymes called ESBLs because of their wide substrate range are of a particular concern in nosocomial infections. In many countries people still use traditional medicine derived from plants as an alternative to the Western medicine due to increased cost of Western medicine and microbial resistance of antibiotic treatments. Biologically active compounds isolated from plants species are used in herbal medicine. Because of the high prevalence of the ESBLs and their increasing resistance to the antibiotics, this research study was done to test the antimicrobial activities of selected medicinal plants of the Eastern Cape; G. incanum, D. angustifolia and E. autumnalis which were traditionally used to treat various infections. The in vitro antimicrobial activity of three different extracts (acetone, methanol & distilled water) and the traditional preparations of the three plants were tested against the selected strains of ESBL-producing bacteria, non β-lactamase producers and the different fungal species. The extracts were screened against 26 Gram-positive bacterial strains, 53 Gram-negative bacterial strains and 15 fungal strains. The Gram-positive bacteria included strains from S. aureus, B. cereus and E. faecalis. The Gram-negative bacteria included strains from E. ii coli, E. cloacae, K. pneumoniae, P. aeruginosa and Acinetobacter spp. The fungal strains included 9 strains of Candida albicans and a single strain of each of the following opportunistic fungi, Mucor sp, Geotrichium sp, Penicillium sp, Fusarium sp and Rhizopus sp. The agar dilution assay was used for the antimicrobial screening of the plants extracts and for the determination of the MICs. The Ames test was performed for the determination of probable carcinogenicity of the extracts of G. incanum and D. angustifolia. The distilled water extracts followed by acetone extracts of the plants revealed the highest antimicrobial activity against the different microbial strains. The extracts of G. incanum followed by the extracts of D. angustifolia inhibited the highest number of microbial strains. The extracts of E. autumnalis did not show any antimicrobial activity against all the pathogens in this study. More of the Gram-positive bacteria were inhibited by the plant extracts. The lowest MIC was obtained with Gram-positive bacteria. The bacterial strains of E. faecalis and P. aeruginosa were not inhibited by any of the plants extracts in the agar dilution assay yet Acinetobacter species which are MDR were inhibited by the distilled water and methanol extracts of G. incanum. A single strain of Mucor sp was the only spore forming fungi that was inhibited by the distilled water extracts of G. incanum. None of the plants extracts showed any mutagenic effects on the TA100 S. typhimurium strains incorporated on the Ames test. Apart from revealing of new antimicrobial agents that may be used against resistant organisms, the proper use of antimicrobial agents should be recommended. The study has highlighted a need for further investigations on the properties of the medicinal plants used in this study.
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Du, Plessis Francois. "The development of a balanced scorecard for strategic planning in a frozen vegetable processing plant." Thesis, Port Elizabeth Technikon, 2001. http://hdl.handle.net/10948/52.
Full textAbstract:
This research investigated the development of a balanced scorecard for a frozen vegetable processing plant. The balanced scorecard can be utilised as a strategic management and performance measurement system. First, an overview of the balanced scorecard concept was presented. Its four perspectives, namely financial, customer, internal business process, and learning and growth were explained. Thereafter, the process of developing a balanced scorecard was outlined and the translation of a firm’s vision into measurable objectives and targets was discussed. Finally, the literature study evaluated the development of balanced scorecards by means of selected case studies. This included an analysis of the successes and failures of balanced scorecards in practice. The research methodology consisted of: (a) A literature study to determine a framework for developing a balanced scorecard. (b) Interviews and workshops to gather the primary data required to develop a balanced scorecard. The development of a balanced scorecard for a frozen vegetable processing plant using the findings from (a) and (b) above. The following recommendations were made: · Targets and action plans should be developed for the outstanding strategic objectives of the plant, and all key performance measurements should be formalised on key performance area documents. All role players should be involved in this process. · All employees must be exposed to, and understand the plant’s vision, mission statement and the purpose of the balanced scorecard. · All employees need to understand how their actions impact on other employees and the well-being of the plant. They must have set objectives and targets that can be measured. · To increase the chance of a successful scorecard implementation, regular feedback must be provided to all employees, and managers must hold people accountable for using the system.
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Norman, Grant. "A comparative analysis of the pre-1996 marketing control board system and the post-1996 free market system, with reference to the South African fruit and vegetable industry." Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/4579.
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Thesis (MBA (Business Management))--University of Stellenbosch, 2009.ENGLISH ABSTRACT: This research report is a comparative analysis of the pre-1996 marketing control board system and the post-1996 free market system in the fruit and vegetable industry in South Africa. The report investigates and discusses the advantages and disadvantages of both systems and their effect on the stakeholders of the industry. The control boards had both positive and negative effects on the producer within the fruit and vegetable industry. The free market system is currently also having an effect, both positive and negative, on the producer. In this research report these divergent effects are explored, the objective being to obtain a better understanding of their impact on the industry stakeholders. On reaching a clearer understanding, strategy recommendations have been designed and are presented for all producers operating within the fruit and vegetable industry. The fresh produce industry is large, with many stakeholders. The information potentially available is vast, but, given the fact that time was too limited to do a complete research study on the entire industry, it was decided to focus on four sectors of the industry, namely bananas, deciduous fruit, citrus and potatoes. To give the report more credibility in terms of the data acquired, a number of interviews were conducted with producers and producer organisation leaders, from whom first-hand, ground level information was obtained. In this research it was found, among other things, that in general there was an imbalance in both the producer and consumer surplus in South Africa. Despite regulation, the marketing control boards had, through the pooling of prices, provided benefits only to certain producers. This, in effect, meant that quality improvement was largely negated, as the return to the producer did not provide an incentive to produce a better quality product. Contrary to the control board system, the free market system provides industry stakeholders with many opportunities, while the role of producers is also evolving to incorporate aspects of marketing. Producers consider service excellence, and culture and diversity to be important. Furthermore, in terms of available channels for marketing, many producers view the fresh produce markets as a desirable means of marketing their produce, as these outlets are still considered to be the price-determining mechanism for the fresh produce industry.
AFRIKAANSE OPSOMMING: Hierdie navorsingsverslag is 'n vergelykende studie van die bemarkingsbeheerraadstelsel voor 1996 en die vryemarkstelsel ná 1996 in die vrugte- en groentebedryf in Suid-Afrika. Die verslag ondersoek en bespreek die voor- en nadele van albei stelsels en hul uitwerking op die bedryf se belangegroepe. Die beheerrade het ’n positiewe sowel as negatiewe uitwerking op die produsent in die vrugte- en groentebedryf gehad. Die vryemarkstelsel het tans ook ’n positiewe sowel as negatiewe uitwerking op die produsent. Hierdie uiteenlopende gevolge word in hierdie navorsingsverslag verken om só ’n beter begrip van die impak daarvan op die bedryf se belanghebbers te verkry. Strategie-aanbevelings is op grond van groter begrip ontwerp en aan produsente in die vrugte- en groentebedryf voorgelê. Varsprodukte is die grootste bedryf in vrugte- en groentebedryf, en daar is talle belangegroepe. Die inligtingsmoontlikhede is enorm, maar gegewe die feit dat tyd te beperk was om ’n volledige navorsingstudie van die hele bedryf te onderneem, is daar besluit om vier sektore te beklemtoon, naamlik piesangs, sagtevrugte, sitrus en aartappels. Om die verslag meer geloofwaardigheid te gee ten opsigte van die data wat verkry is, is ’n aantal onderhoude met produsente en die leiers van produsentorganisasies gevoer om eerstehandse, voetsoolvlakinligting te bekom. Die verslag het onder meer bevind dat daar oor die algemeen ’n wanbalans in die produsente- sowel as verbruikersurplus in Suid-Afrika is. Die bemarkingsbeheerrade het ondanks regulasie voordele slegs aan sekere produsente gebied deur die saampot van pryse. Dit het in werklikheid beteken dat gehalteverbetering grootliks ontken is omdat die opbrengs nie die produsent aangespoor het om die gehalte van hul produkte te verbeter nie. Die vryemarkstelsel bied, in teenstelling met die beheerraadstelsel, talle geleenthede aan die bedryf se belangegroepe terwyl die rol van produsente ook ontwikkel word om aspekte van bemarking te inkorporeer. Produsente beskou voortreflike diens, en kultuur en diversiteit as belangrik. Daarby beskou produsente die varsproduktemark, wat een van die beskikbare bemarkingskanale is, as ’n wenslike manier om hul produkte te bemark omdat dié afsetpunt steeds as die prysbepalende meganisme vir die varsproduktebedryf gesien word.
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Pereira, Catherine Jane. "Understanding fruit and vegetable consumption : a qualitative investigation in the Mitchells Plain sub-district of Cape Town." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86712.
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Thesis (Mnutr)--Stellenbosch University, 2014.ENGLISH ABSTRACT: Introduction Adequate fruit and vegetable consumption can provide many health and nutrition benefits, and can contribute to nutritional adequacy and quality of the diet. Despite existing strategies, most people in South Africa do not consume the recommended intake of five fruits and vegetables per day, and micronutrient intakes remain low. Aim The aim of this study was to describe underlying factors that influence individual and household fruit and vegetable consumption, in an area of the Mitchells Plain sub-district, by engaging with community members in a participatory manner in accordance with a human rights-based approach. Methodology This study was cross-sectional and descriptive. Data collection was conducted from November 2012 until January 2013, in an area of Mitchells Plain. Focus group discussions were conducted to gain a broad understanding of factors that influence fruit and vegetable consumption in the community and to identify individuals for individual interviews. In-depth interviews were conducted with strategically selected community members considered to be influential in food preparation, distribution or consumption, in order to gain in-depth understanding of specific factors associated with fruit and vegetable consumption. Results Four focus group discussions were conducted with 40 participants in total, allocated to three different groups (18 to 29 year old females, 30 to 70 year old females, 18 to 60 year old males). Fifteen in-depth interviews were conducted with community leaders, individuals involved in food production (kitchen managers) or sale thereof (an informal vendor and a tuck shop owner), individuals involved in health education (a professional nurse) and basic education (a grade one educator), and others. Dominant themes discussed included fruit and vegetable consumption patterns (religious, cultural and traditional dishes, seasonal variation), fruit and vegetable preparation techniques and commonly prepared dishes, fruit and vegetable access (purchasing, vegetable gardens and direct provision) and changes in fruit and vegetable consumption patterns. Barriers to fruit and vegetable consumption included that although most participants considered them to be important, fruit and vegetables were not considered a priority food item (inadequate time and effort is allocated to food purchasing and preparation), negative side-effects of consumption, fruit and vegetables are perishable and benefits of fruit and vegetable consumption are not immediately apparent. Facilitators of fruit and vegetable consumption were personal preference, traditional dishes prepared that include fruit or vegetable ingredients, individuals who sell or grow fruit and vegetables having increased availability, use of convenience fruit and vegetable items, and modelling and discipline in children. Suggestions to improve consumption included education using practical advice such as fruit recipes to improve the appeal of fruit and vegetable dishes, and methods to decrease preparation time and cost. Conclusions Limited fruit and vegetable consumption is not simply determined by limited nutrition knowledge or poor decision-making by households, but rather by a much wider set of social, economic and spatial processes. Creative and innovative behaviour-changing strategies are required that target individuals but also take cognisance of wider structural barriers, and work to create an enabling environment that is supportive of healthy eating and an adequate consumption of fruit and vegetables.
AFRIKAANSE OPSOMMING: Inleiding Voldoende inname van vrugte en groente hou baie gesondheids- en voedingsvoordele in, en kan bydra tot voedingstoereikenheid en kwaliteit van die dieet. Ongeag bestaande strategieë, neem die meeste mense in Suid-Afrika nie die aanbevole vyf vrugte en groente in nie, en mikronutriënt inname bly laag. Doelwit Die doel van hierdie studie was om die onderliggende faktore wat indiwiduele en huishoudelike vrugte- en groenteverbruik in 'n area van die Mitchells Plein subdistrik beïnvloed, te beskryf, deur met lede van die gemeenskap in 'n deelnemende manier betrokke te raak in ooreenstemming met 'n menseregte-gebaseerde benadering. Metodes Hierdie deursnee studie was beskrywend. Data-insameling het vanaf November 2012 tot Januarie 2013 in 'n gedeelte van Mitchells Plein plaasgevind. Fokusgroepbesprekings is gehou om 'n breër begrip van die faktore wat vrugte- en groenteverbruik in die gemeenskap beïnvloed, te bekom en om indiwidue te identifiseer vir indiwiduele onderhoude. In-diepte onderhoude is gevoer met strategies verkose gemeenskapslede wat beskou word as invloedryk in voedselvoorbereiding, verspreiding en verbruik, om 'n dieper begrip van spesifieke faktore wat met vrugte- en groenteverbruik verband hou, te bekom. Resultate Vier fokusgroep-besprekings is gehou met 'n totaal van 40 deelnemers, versprei oor drie verskillende groepe (18 - 29 jarige vroue, 30 - 70 jarige vroue, 18 - 60 jarige mans). Vyftien in-diepte onderhoude is gevoer met gemeenskapsleiers (polities en godsdienstig), indiwidue betrokke by voedselverwerking (kombuisbestuurders) of verkope (informele verkoper en snoepwinkeleienaar), indiwidue betrokke by gesondheidsopvoeding (professionele verpleegster) en basiese onderrig (graad een opvoeder) en andere. Oorheersende temas sluit in vrugte- en groenteverbruikspatrone (godsdienstige, kulturele en tradisionele disse, seisonale wisseling in gebruik), vrugte en groente voorbereidingstegnieke en alledaagse disse, toegang tot vrugte en groente (aankoop, groentetuine en direkte voorsiening) en verandering in vrugte- en groenteverbruikspatrone. Hindernisse tot vrugte- en groenteverbruik sluit in dat hoewel die meeste deelnemers vrugte- en groenteverbruik belangrik ag, word vrugte en groente nie as 'n prioriteitsvoedsel gesien nie. Voldoende tyd en aandag word nie aan voedsel-aankope en -voorbereiding afgestaan nie, daar is negatiewe newe-effekte aan verbruik, vrugte en groente is bederfbaar en die voordele van vrugte en groenteverbruik is nie duidelik waarneembaar nie.Persoonlike voorkeur is bevorderlik vir vrugte- en groenteverbruik, sommige tradisionele disse word met vrugte of groente bestanddele voorberei, asook die groter beskikbaarheid van indiwidue wat vrugte en groente verkoop of kweek, die gebruik van vrugte en groente gemaksitems, en die gedragsmodellering en dissiplinering van kinders. Voorstelle om verbruik te verbeter het ingesluit opvoeding met praktiese raad soos vrugte en groente resepte om die aantreklikheid van vrugte en groente disse te verhoog en metodes om voorbereidingstyd en onkoste te verminder. Gevolgtrekking Beperkte vrugte en groente verbruik word nie net bepaal deur beperkte voeding kennis of swak besluitneming deur huishoudings nie, maar deur 'n veel wyer reeks van maatskaplike, ekonomiese en ruimtelike prosesse. Skeppende en innoverende gedragsveranderende-strategieë wat gemik is op indiwidue is nodig, asook aandag aan wyer strukturele hindernisser. Sodoende kan ‘n bemagtigende omgewing geskep word om gesonde eetgewoontes en die verbruik van voldoende vrugte en groente te ondersteun.
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Tshivhandekano, Itani. "Water quality in the City of Tshwane, South Africa and its role in food safety for vegetable production." Pretoria : [s.n.], 2006. http://upetd.up.ac.za/thesis/available/etd-07092008-151025.
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Ncula, Ntombizandile Shirley. "Food gardens, environmental lesson planning and active learning in the life orientation learning area - foundation phase : a case study at Lungelolethu Lower and Higher Primary School /." Thesis, Rhodes University, 2007. http://eprints.ru.ac.za/927/.
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Van, Gend Tania Anli. "Effect of a South African medicinal plant on antiretroviral drug induced abnormalities in rats." Thesis, Nelson Mandela Metropolitan University, 2008. http://hdl.handle.net/10948/1080.
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The worldwide AIDS epidemic is known to have had a profoundly negative social, economic and personal impact and has taken a heavy toll on existing health care systems, particularly in developing countries. South Africa is experiencing an HIV epidemic with enormous social and economic consequences. Lopinavir/ritonavir antiretroviral treatment has been accredited with having a significantly positive effect and is a key advance in controlling HIV morbidity and mortality. An indigenous South African medicinal plant, Sutherlandia frutescens, known for its anti-diabetic properties and immune-boosting effects, is used for treating HIV positive patients suffering from opportunistic infections. Despite the use of the medicinal plant extract as homeotherapeutic medication, there is little evidence of toxicity testing that identifies its potential for interaction with antiretroviral drugs. However, scientific data relating to the mechanism through which Sutherlandia frutescens acts on the immune system has not been comprehensively documented. The aim of this study was to investigate lopinavir/ritonavir induced metabolic abnormalities in rats and whether the introduction of a plant extract of Sutherlandia frutescens would counteract the side effects of ARV medication. The results indicated that the rodents did not become insulin resistant, however, biochemical analysis indicated that extended ARV drug treatment would have caused insulin resistance. Significant morphological changes were found in the livers, kidneys and pancreases of rats exposed to the lopinavir/ritonavir. Rats exposed to the Sutherlandia frutescens plant extract showed improved histopathology with minimal abnormalities.
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Mnonopi, Nandipha Olivia. "In vitro testing to investigate the anticoagulant/antithrombotic and antidiabetic biological activity of Leonotis Leonurus." Thesis, Nelson Mandela Metropolitan University, 2007. http://hdl.handle.net/10948/693.
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The rising costs of prescription drugs in the maintenance of personal health and wellbeing have increased the interest in medicinal plants. The World Health Organization estimates that 65 percent-80 percent of the world’s population use traditional medicine as their primary form of health care. In this project the focus has been on the use of Leonotis leonurus extracts as a traditional medicine. The major chemical constituent of this plant is marrubiin, which is a diterpenoid labdane lactone formed from a precursor called premarrubiin. Aqueous and acetone extract (AL and OL extract, respectively) of this plant has been found to have an antithrombotic effect, with IC50 values of 3mg/ml and 6mg/ml, respectively. The extracts also have an effect on fibrinolysis, where the lysis time was decreased by more than 50 percent by the organic extract and standard marrubiin. In whole blood ADP-induced platelet aggregation, the organic extract inhibited aggregation by 68 percent at a final concentration of 138μg/ml (equivalent to 7.2μg/ml marrubiin). Marrubiin has also been screened for antithrombotic/anticoagulant activity; no antithrombotic activity has been observed but it increased the rate of fibrinolysis, by decreasing lysis time by 64 percent and also decreasing fibrin formation. From these findings it can be concluded that marrubiin has a fibrinolytic effect and antiplatelet aggregation effect. In the diabetic studies, in hyperglycemic condition, the OL (10μg/ml) extract and standard marrubiin significantly increased insulin secretion by 200 percent (2-fold) and 400 percent (4-fold), respectively, with respect to the control. The OL extract and standard marrubiin stimulated the release of insulin, the stimulatory index was significantly increased by 450 percent (4.5-fold) and 500 percent (5-fold), respectively, with respect to the control. In the apoptotic studies, in the normoglycemic and hyperglycemic conditions, the OL extract decreased the occurrence of apoptosis, in a dose-dependent manner, with the lower concentrations inducing apoptosis significantly higher than the relevant controls. Standard marrubiin did not have an effect on apoptosis in hyperglycemic condition, but it decreased the occurrence of apoptosis by 200 percent (2-fold) under normoglycemic conditions. The OL extract increased proliferation by 148 percent (1.48- fold) and 155 percent (1.55-fold) in normoglycemic and hyperglycemic conditions, respectively. The same effect was observed for standard marrubiin, where, proliferation was increased by 180 percent (1.8-fold) and 200 percent (2.0-fold) in normoglycemic and hyperglycemic conditions, respectively. RT-PCR displayed that standard marrubiin inhibited the expression of insulin by 50 percent under normoglycemic conditions.
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Mnonopi, Nandipha. "Leonotis leonurus: the anticoagulant and antidiabetic activity of Leonotis leonurus." Thesis, Nelson Mandela Metropolitan University, 2010. http://hdl.handle.net/10948/1194.
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Commercial marrubiin, aqueous and organic extracts of Leonotis leonurus were tested in vitro for their anticoagulant and antiplatelet activities. The aqueous extract inhibited platelet aggregation by 69.5 percent (100 μg/mL), while the organic extract (100 μg/mL) and marrubiin (5 μg/mL) showed 92.5 percent and 91.6 percent inhibition, respectively, by inhibiting the binding of fibrinogen to glycoprotein IIb/IIIa receptor in a concentration dependent manner. The extracts significantly prolonged activated partial thromboplastin time compared to untreated plasma controls. Fibrin and D-Dimer formation were drastically decreased. The extracts and marrubiin concentration-dependently inhibited calcium mobilization induced by collagen and thrombin. The formation of thromboxane A2 was also significantly reduced by both the extracts and marrubiin. Protein secretion and platelet adhesion were significantly reduced by both the extracts and marrubiin. The organic extract and marrubiin showed a more pronounced effect than the aqueous extracts in all the in vitro assays. The ex-vivo animal model confirmed the results obtained in vitro. Similar to the in vitro studies, activated partial thromboplastin time clotting time was prolonged by marrubiin and the number of aggregated platelets were significantly reduced relative to aspirin. The findings reflect that marrubiin largely contributes to the organic extract's anticoagulant and antiplatelet effect in vitro. INS-1 cells were cultured under normo- and hyperglycaemic conditions. Marrubiin and the two Leonotis leonurus extracts were screened for anti-diabetic activity in vitro. The stimulatory index of INS-1 cells cultured under hyperglycaemic conditions was significantly increased by 60 percent and 61 percent (p<0.01; n=5) in cells exposed to the organic extract (10 μg/mL) and marrubiin (500 ng/mL), respectively, relative to the normoglycaemic conditions. The gene expression of insulin was significantly increased by 76.5 and 71 percent, and of glucose transporter-2 by 93 and 92.5 percent for marrubiin and the organic extract, respectively, under the same conditions stipulated above (p<0.01; n=4). The extract and marrubiin similarly showed an increase in respiratory rate under hyperglycaemic conditions. Marrubiin increased insulin secretion, HDL-cholesterol, while it decreased total cholesterol, LDL-cholesterol and the atherogenic index in the in vivo rat model.
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Fang, Yuan Yuan. "In vitro drug-herb interaction potential of African medicinal plant products used by Type II diabetics." Thesis, Nelson Mandela Metropolitan University, 2011. http://hdl.handle.net/10948/1341.
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In Africa, use of medicinal plants for the treatment of diabetes is very common. However, efficacy on co-administering of medicinal plants with therapeutic drugs hasn't been fully determined, especially for African medicinal plants. The current study focused on assessing the in vitro modulation effects of three popular African medicinal plants, namely: Aloe ferox, Sutherlandia frutescens and Prunus africana (including five commercial preparations containing these medicinal plants) on two of the most important anti-diabetic drug metabolising enzymes, Cytochrome P450 (CYP450) 2C9 and CYP3A4 and a key drug efflux transporter, P-glycoprotein (P-gp). Vivid® microsome-based screening kits were used to assess inhibitory potency of plants preparations on CYP2C9 and CYP3A4 enzymes activities. The study showed that P. africana was a more potent inhibitor of CYP2C9 and CYP3A4 activity than the corresponding positive controls Ginkgo biloba and St. John's wort, which are known to cause clinically significant drug-herb interactions. S. frutescens leaf extract demonstrated potent to moderate inhibition on both the tested CYP activities, while its commercial products (Promune® and Probetix®) possessed moderate to mild inhibitory effects on the activities of both CYPs. Potent inhibitory effect on CYP2C9 and CYP3A4 was seen with Aloe Ferox®. Prosit® and Aloes powder® showed potent to moderate inhibition on CYP2C9 activity and moderate to mild inhibition on CYP3A4 activity. In addition to CYP450 activity, the present study also investigated the effects of the selected medicinal plant products on the activity of the main drug efflux protein, P-gp. A screening assay was specifically developed to assess the potential for herbal remedies to interact with P-gp mediated drug absorption. The assay is based on the principle of the reversal of drug resistance in modified Caco-2 cells specifically altered to express high iv efflux protein activity. These cells display a multidrug resistance phenotype and the addition of a plant extract containing a P-gp inhibitor or substrate will inhibit or compete with any cytotoxic drug and consequently reverse the drug resistance. The suitability of the assay was confirmed using a known P-gp inhibitor. The study observed that the anti-proliferation effect of vinblastine was significantly enhanced in vinblastine-resistant Caco-2 cells, which have high P-gp expression, when they were exposed to the selected African herbal preparations. This observation indicates that the studied plant preparations may alter P-gp functionality and therefore lead to interference with the absorption of co-administered drugs. The outcomes of this study provide useful information on whether there are any potential drug-herb interactions between the commonly used African medicinal plants and oral anti-diabetic drugs, at the level of CYP and P-gp drug metabolism and could contribute to better therapeutic management of Type II diabetics. However these predicted interactions will need to be verified in a clinical setting.
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Chinyama, Robert Fred. "Biological activities of medicinal plants traditionally used to treat Septicaemia in the Eastern Cape, South Africa." Thesis, Nelson Mandela Metropolitan University, 2009. http://hdl.handle.net/10948/1274.
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Over the past 25 years, there has been a resurgence of worldwide scientific research in the fields of ethnopharmacology. The Western world has acknowledged the continued use of traditional medicines by the majority of third world countries, and the need for novel drug development. Hence, much of the pharmaceutical research in recent years has focused on the ethnobotanical approach to drug discovery (Light et al., 2005). In South Africa, as in most developing parts of the world, traditional herbal medicine still forms the backbone of rural healthcare. The government health services in South Africa provide only western medical care although the majority of the population consult traditional healers for some or all of their healthcare needs (McGaw et al., 2005). Medicinal plants like Harpephyllum caffrum are used as blood purifiers or emetics (Watt and Breyer-Brandwijk, 1962), and also for treating acne and eczema. The antimicrobial activity of this plant can be used to treat septicaemia, which is ranked the sixth leading cause of death among neonates and the eighth leading cause of death for infants through the first year of life (Heron, 2007). In this study, the plants investigated for antimicrobial activity were Harpephyllum caffrum, Hermannia cuneifolia, Chironia baccifera, Rhigozum obovatum, Felicia muricata and Pentzia incana. These plants were tested against ATTC (American Type Culture Collection) strains and microorganisms isolated from clinical isolates of patients suffering from septicaemia. The assay methods used included the agar diffusion method using the Mast multipoint inoculator, the microtitre dilution method were used to determine the minimum inhibitory concentration, thin layer chromatography fingerprints accompanied by bioautographic assay were used to detect the inhibition of bacterial growth by active compounds separated from plant extracts and the Ames test was required to assess the possibility of bacterial mutagenesis upon the exposure to plant extracts which can lead to carcinogenicity. In agar diffusion method, extracts of Harpephyllum caffrum inhibited nine strains of Candida albicans, three species of Acinetobacter and four strains of E.faecalis. Extracts of Hermannia cuneifolia inhibited four strains of B.cereus and three strains of Staphylococcus aureus. Extracts of Chironia baccifera inhibited one strain of Acinetobacter and five strains of E.faecalis. Extracts of plants Rhigozum obovatum, Felicia muricata, and Pentzia incana showed no antimicrobial activity. In the microtitre dilution method used to determine the minimum inhibitory concentration (MIC), the results were different from the agar diffusion method. More activity was observed. Extracts of Harpephyllum caffrum inhibited three strains of E.coli, six strains of S.aureus, three species of Acinetobacter and one strain of Klebsiella pneumonia. Extracts of Hermannia cuneifolia inhibited four strains of B.cereus, three strains of S.aureus, two strains of K.oxytoca and one species of Acinetobacter. Extracts of Chironia baccifera inhibited three strains of S.aureus, one strain of MRSA, one species of Acinetobacter and one strain of S.haemolyticus. The MIC values ranged from 0.049 to 6.25mg/ml. Using the thin layer chromatography fingerprints, bioautography showed the presence of various inhibitory chemical compounds. Methanol and acetone extracts of Harpephyllum caffrum, separated very well and showed various inhibition zones on exposure to Candida albicans, Enterococcus faecalis and Staphylococcus aureus. The different inhibition zones were recorded as Rf In the Ames test (Maron and Ames, 1983) the methanol and acetone extracts of Harpephyllum caffrum and Hermannia cuneifolia were negative which means they were devoid of any mutagenic properties. Methanol extracts of Harpephyllum caffrum showed similar results in the Ames assay as reported by Verschaeve and Van Staden (2008). values ranging from 0.25 to 0.95. The zones indicate the different inhibiting chemical compounds present in the plant. Petroleum ether, ethyl acetate, chloroform and formic acid were the solvents used in the assay in the ratio 8:7:5:1, respectively. Establishing the antimicrobial activity of these plants contribute to the systematic scientific investigation of indigenous South African medicinal plants.
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Muwanga, Catherine. "An assessment of Hypoxis hemerocallidea extracts, and actives as natural antibiotic, and immune modulation phytotherapies." Thesis, University of the Western Cape, 2006. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_3303_1184589097.
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In South Africa, the crude aqueous extract from Hypoxis hemerocallidea is used by AIDS patients to treat opportunistic infections, such as tuberculosis. The rapid emergence of multidrug-resistant tuberculosis, and extreme drug resistant tuberculosis, in recent years, is a major threat to human health. The treatment of TB, nosocomial bacterial infections, and fungal infections is now a clinical challenge, especially in the immuno-compromised individual. There is a dire need for novel antibiotic alternatives with phytotherapies and plant-derived compounds as potentially promising alternatives. The main objective of this study was to investigate the antimycobacterial activity of Hypoxis hemerocallidea, a South African medicinal plant, using Mycobacterium smegmatis.
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Williams, Samantha. "Socio-economic aspects of the sustainable harvesting of buchu (Agathosma Betulina) with particular emphasis on the Elandskloof community." Thesis, University of the Western Cape, 2005. http://etd.uwc.ac.za/index.php?module=etd&.
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The aim of this thesis was to explore the socio-economic factors that impact on the sustainable harvesting of buchu in the Western Cape of South Africa. Some of the factors that were explored include poverty, natural resource tenure, legislation, and local practices with regard to the harvesting of buchu.
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Ramoroka, Kgabo Hector. "Participation and utilisation of formal vegetable markets by smallholder farmers in Limpopo : A tobit II approach." Thesis, University of Limpopo (Turfloop Campus), 2012. http://hdl.handle.net/10386/738.
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Thesis (M.Sc. (Agricultural Economics))--University of Limpopo, 2012Farmers in Polokwane Local Municipality produce many vegetables including beetroot, carrots, spinach, garlic, cabbage and butternut, which they mainly sell in informal local markets through speculating and hawking. Some sell to hawkers, who sell fresh produce from stalls in small markets and on the streets. Although there are a number of fresh produce markets operating successfully in Polokwane, such as Goseame Fresh Produce Market and Polokwane Fruit and Veg City, only a few smallholder farmers supply vegetables to these major markets. This research focused on providing information relevant to vegetable marketing in the province by identifying and analysing those farm and farmer characteristics influencing smallholder farmers’ decision to participate and utilise formal vegetable markets. The overall objective of the study was to examine farm and farmer characteristics of smallholder vegetable farmers that influence their decision to participate and utilise formal markets. The study was conducted in Polokwane Local Municipality and a sample size of 80 subsistence and emerging farmers was interviewed. STATA (2010) was used to analyse the data.Two approaches were used; the separated OLS and logit regression models and the Heckman selection model, although conclusions are based on the Heckman selection model regression results. We recommend the use of the Heckman selection model due to its limited bias compared to the other method. Results show that two variables; level of education and farmer occupation were positively and significantly associated with smallholder farmers’ decision to participate in the formal vegetable markets. Household size, tenure security and distance to the market had a significant negative influence on smallholder farmers’ decision to participate in the formal markets. Level of education, farm labour, hectares used and cost of transport were significantly and positively associated with the value of vegetables marketed in the formal markets. Gender of household head, member of a farmer group, farming experience, access to non-farm income and access to extension services had a significant negative impact on the value of vegetables marketed in the formal markets. In view of the research findings, several policy suggestions are made. These include capacitating farmers, provision of land for farming, establishment of depots and markets closer to the farmers, encouraging formation of farmer groups or organisations, increasing the number of extension visits to farmers, specialised services and encouraging commercialisation of smallholder agriculture in rural areas.
University of Limpopo Department of Agricultural Economics and Animal Production
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Rasi, Nandi. "Contextualizing the NCS through the use of school gardens in the Butterworth area." Thesis, Rhodes University, 2009. http://hdl.handle.net/10962/d1003345.
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The research focuses on how teachers can use school gardens sponsored by South African National Biodiversity Institute as resource materials for teaching and learning. The study also focused on how teachers can integrate local knowledge into the school curriculum. The setting of the research is Zizamele Senior Primary School situated in Zizamele community in Butterworth in the Eastern Cape. The study is designed in portfolio format. It consists of three separate studies: a contextual profile; a stakeholder analysis; and a small-scale action research project, which build on each other. By developing a contextual profile of the research site, and the school community and school gardens project, I was able to collect information that informed the stakeholder analysis and the action research study. Data for the contextual profile was gathered by using a variety of data gathering techniques like questionnaires and interviews. The findings were that: the study area is characterized by socio-economic issues like poverty, unemployment, drug abuse and crime. This requires that the people of the area take responsibility in addressing some of the problems by being involved and knowing where to report issues. The second study, which is the stakeholder analysis, was done to mobilize stakeholders’ contributions to the gardens project in Zizamele School, sponsored by the South African National Biodiversity Institute. Data was collected at meetings and workshops in the schools through interviews. Findings indicated that different stakeholders had various contributions to make and that they were prepared to work with the school and with each other to develop the school garden and the learning potential of the school garden. This paved the way for the small scale action research case study that would follow. The last study, the small scale action research, was undertaken in the same school, Zizamele School, and focused on investigating ways of integrating local knowledge into the curriculum and how teachers use the gardens as resource for teaching and learning, with reference to Life Orientation Learning Area. Data was collected by interviews, questionnaires and worksheets. The study involved two teachers who worked with me on the action research and Grade 5 and 6 learners, as well as some of the community stakeholders. The main finding of the action researched showed the potential for involving community members in the process of integrating local knowledge as a way of implementing aspects of the Life Orientation curriculum requirements. The three studies link with each other, and show that to start with an action research project, one needs to understand the context, and the roles of different stakeholders, and how they might contribute to the programmes in the school. Findings showed that teachers could use gardens as resource materials for teaching and learning, and that they could bring in local knowledge to the school curriculum.
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Monakisi, Charlotte M. "Knowledge and use of traditional medicinal plants by the Setswana-speaking community of Kimberley, Northern Cape of South Africa." Thesis, Stellenbosch : Stellenbosch University, 2007. http://hdl.handle.net/10019.1/18589.
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Thesis (MSc)--University of Stellenbosch, 2007.ENGLISH ABSTRACT: The majority of South Africans still depend on the use of traditional remedies, as these are sometimes the only types of health care systems available, especially within rural communities. South Africa comprises approximately 400 000 traditional healers and an estimated 60 to 80% of individuals consulting such traditional healers. As a result, the over-harvesting of many traditional medicinal plants has become a threat to the country’s species diversity and has resulted in the scarcity of certain medicinal plant species. The non-sustainable use of traditional medicinal plants stems from their intense harvesting from the wild to supply the high demands from urban and rural markets. As a result of the escalating population growth rate; high rural unemployment; and fundamental value attached to traditional medicinal plants (socio-economic factors), the national and regional trade of traditional medicines is currently higher than it has ever been. Another reason for the increased threat to traditional medicinal plants is the degradation and weakening of customary laws that have previously regulated such resources. This study focuses on the use of traditional medicinal plants by the Setswana-speaking community for self-medication and as a form of primary health care. Research was conducted in Kimberley, Northern Cape of South Africa and focuses on the issue of the sustainability of medicinal plant use in the area, specifically on use and users as well as the acquisition of material sold by a single trader and harvesting techniques. This is to determine whether harvesting of medicinal plants is a potential threat to plant communities in the area. To address the shortcomings of medicinal anthropology the study also investigates the impacts of relocation and resettlement of various communities in the area, on plant use, methods of collection, the sustainability of the natural resource, as well as the transmission of Setswana indigenous knowledge inter-generationally. most abundant under high disturbances. Certain species reacted positively to disturbance and were most abundant in disturbed habitats. These included Elephantorrhiza elephantina and a Helichrysum sp. To minimise destructive harvesting in the Kimberley area and to ensure the sustainable harvesting of plant material, it is important that local harvesters are educated on proper harvesting techniques and that local gatherers are educated on sustainability issues as well as other ecologically fundamental issues.
AFRIKAANSE OPSOMMING: Die meeste Suid-Afrikaners is steeds afhanklik van tradisionele geneesmiddels aangesien dit soms, veral in landelike gemeenskappe, die enigste beskikbare gesondheidsorg is. Suid-Afrika het sowat 400 000 tradisionele geneeshere wat deur ’n geraamde 60% tot 80% van individue geraadpleeg word. As gevolg hiervan hou die oorontginning van talle tradisionele medisinale-planthulpbronne ’n bedreiging vir die land se spesiediversiteit in en het dit reeds tot ’n skaarste aan sekere medisinale plante gelei. Tradisionele medisinale plante word tans nievolhoubaar aangewend aangesien dit op groot skaal in die veld geoes word om in die groot vraag van stedelike en landelike markte te voorsien. As gevolg van die stygende bevolkingsgroeikoers, hoë landelike werkloosheidsyfer en die grondliggende waarde wat aan tradisionele medisinale plante geheg word (sosio-ekonomiese faktore), is die nasionale en streekhandel in tradisionele geneesmiddels tans groter as ooit tevore. Nog ’n rede vir die toenemende bedreiging van tradisionele medisinale plante is die verslapping en versagting van gewoonteregwetgewing wat voorheen sodanige hulpbronne gereguleer het. Hierdie studie fokus op die gebruik van tradisionele medisinale plante deur die Setswanagemeenskap vir selfbehandeling en as ’n vorm van primêre gesondheidsorg. Die navorsing vir die studie is in Kimberley in die Noord-Kaapprovinsie van Suid-Afrika gedoen en fokus op die kwessie van volhoubare medisinale-plantgebruik in die gebied, met bepaalde klem op gebruik en gebruikers, die verkryging van middels wat deur ’n enkele handelaar verkoop word, en oestegnieke. Die doel van die navorsing was om te bepaal of die oes van medisinale plante ’n moontlike bedreiging vir plantgemeenskappe in die gebied inhou. Om die tekortkominge van medisinale antropologie aan te pak, ondersoek die studie ook die uitwerking van die verskuiwing en hervestiging van verskeie gemeenskappe in die gebied op plantgebruik, oesmetodes, die volhoubaarheid van die natuurlike hulpbronne, asook die oordrag van inheemse Setswana-kennis oor geslagte heen. Selfbehandeling en die gebruik van tradisionele medisinale plante speel steeds ’n groot rol in Kimberley, aangesien die meeste van die individue wat aan die navorsing deelgeneem het steeds tradisionele geneesmiddels as deel van hulle kultuur en tradisie gebruik. Daar word in ’n uiteenlopende verskeidenheid plantmateriaal handel gedryf. Hoewel sommige van die middels plaaslik ingesamel word, word die meeste van ander dele van die land, en in party gevalle van buurlande soos Lesotho en Swaziland, ingevoer. Hoewel die meeste van die materiaal dus nie plaaslik ingesamel word en dus nie bepaald op hierdie studie betrekking het nie, is dit steeds aanduidend van oes- en volhoubaarheidskwessies in ander dele van die land. Die kruiekenner dryf in sewentig tradisionele medisinale-plantsoorte handel, waarvan party beskermd en erg bedreig is, waaronder Prunus africana en Warburgia salutaris wat slegs in beskermde gebiede in die land voorkom. Prunus africana is ’n gelyste spesie in CITES, aanhangsel 2. Ander bedreigde spesies sluit Ocotea bullata, Bersama lucens, Curtisia dentata en ’n Eugenia-spesie in. Die meeste van die plante wat (in Kimberley) geoes word, is in die vorm van ondergrondse bergingsorgane (uitlopers en bolle). Hoewel hierdie plante van stingelskade en die skade aan ondergrondse bergingsorgane kan herstel, vat hulle swak pos indien hulle oorgebruik en oorontgin word, en kan hulle dus mettertyd al hoe minder voorkom. In hierdie studie word die mettertydse afname in plantbevolkings deur die toename in reisafstande na insamelingspunte aangetoon. Hierdie tendens is egter nie in die handelsprys en -materiaalhoeveelhede oor die afgelope eeu weerspieël nie. Die meeste van die studiedeelnemers het bevestig dat die prys en hoeveelheid van die handelsmateriaal deurentyd betreklik stabiel gebly het. Van die teikenspesies wat vir kwesbaarheid of sensitiwiteit vir ontwrigting ondersoek is, het Withania somnifera, Boophane disticha, Dicoma anomala en Bulbine natalensis die laagste oorlewingspotensiaal en die hoogste ontwrigtingsensitiwiteit getoon. Die meeste van hierdie spesies het in baie klein hoeveelhede op die gekose terreine voorgekom. In die geval van Withania somnifera kon die negatiewe resultate egter met die laereënvalseisoen gedurende daardie betrokke jaar in verband gebring word. Hierdie spesie word oor die algemeen as ’n onkruid in ontwrigte gebiede geklassifiseer en kom meestal onder erg ontwrigte toestande voor. Sekere spesies, soos Elephantorrhiza elephantina en ’n Helichrysum-spesie, het positief op ontwrigting gereageer en het volop in ontwrigte habitatte voorgekom. Om vernietigende oestery in die Kimberley-omgewing te minimaliseer en die volhoubare ontginning van planthulpbronne te verseker, is dit belangrik dat plaaslike plukkers in gepaste oestegnieke, en plaaslike insamelaars oor volhoubaarheidskwessies en ander ekologies belangrike sake opgelei word.
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Mazingisa, Bongani Eric. "How can school gardens be used for teaching environmental activities in the technology learning area at senior phase?" Thesis, Rhodes University, 2009. http://hdl.handle.net/10962/d1003440.
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This study was conducted as a case study at the rural Ethridge Junior Secondary School which is located in the Eastern Cape Province of South Africa. The aim of the study was to investigate how school gardens could be used to teach environmental activities in the Technology Learning Area at senior phase. The study examined how environmental activities in the school garden can be used to develop technological concepts and knowledge and for developing technological problem-solving abilities. Furthermore, it examined the relationship between technology, society and environment, and how structural and socio-cultural factors influence the use of environmental activities in the school garden. The overall approach was a case study. The data was generated using qualitative methods such as interviews, observation, workshops and document analysis of learners’ work. Of all the research tools used, the interviews and observations were the most fascinating and informative methods. The study focused on various activities undertaken by Grade 8 learners in their Technology Learning Area. These activities were compost making, planting and irrigating. The study showed how learners from poor rural homes can use available resources and suitable technology processes to plant vegetables. In terms of resources, virtually all resources used in the study were free, sourced locally and/or borrowed. This indicated that even in poor, rural areas materials are available to make structures and complete activities. In terms of available suitable technology, learners in the study explored the use of old car tyres for planting containers that can be easily transported. They also, using easily available resources such as tin cans, explored how to design and construct an effective, low-water consumption, low cost irrigation devise. The study explored the achievement of Learning Outcomes (LO) using the school garden. This study uses the school garden as a teaching aid to achieve the three main LO’s in the Technology Learning Area (LA). This study has also indicated that LO’s are sometimes intertwined, that is to say that more than one can be achieved at the same time. The three activities (compost making, planting and irrigation) were used to attain the required LO’s. The study indicates that LO 1 (related to applying technological processes and skills ethically and responsibly) can easily be achieved by designing a compost box and a compost heap, making them and evaluating the process. LO 2 (related to understanding and applying relevant technological knowledge) could easily be achieved in the irrigation activity, and LO 3 (related to demonstrating interrelations between science, technology, society and environment) could easily be attained in both compost making and planting. The study also showed that curriculum activities, such as those used in this study, are influenced by socio-cultural and structural factors that influence the curriculum contextualizing process. The main findings of the study are captured in five analytical statements. These form the basis for a set of recommendations to inform the use of school gardens as a resource for technology teaching in Ethridge Junior Secondary School, and possibly for other rural schools.
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Jenkins, Msawenkosi Wiseman. "Curriculum recontextualising using gardens for the health promotion in the life orientation learning area of the senior phase." Thesis, Rhodes University, 2008. http://hdl.handle.net/10962/d1003368.
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With a view to understanding how curriculum is interpreted at classroom practice level, the study examined three stories of how the environmental discourse of the National Curriculum Statements (R-9) was recontextualised using school gardens in the Life Orientation Learning Area for the Senior Phase. To understand how the curriculum is recontextualised, I used Bernstein's theory of recontexutalisation where he explained how official pedagogic discourse (OPD) (in this case the environmental discourse is first delocated once it is transferred from the field of production (FOP) and relocated in the recontextualising field (where teacher educators and departmental officials mediate the discourse) and in the field of reproduction (FOR) which is the classroom and school. Bernstein explained that as the discourse is delocated and relocated it undergoes transformation. This transformation is influenced by practitioners' prior-knowledge, experience, culture and beliefs and other factors. To understand how transformation of the environmental discourse takes place, Bernstein's conceptual constructs of selective appropriation and ideological transformation were applied to an interpretation of three lesson processes, to explain how the discourse was changed. Each lesson was reviewed in terms of the selective appropriations and ideological transformations which took place. All three of the lessons observed took place in one school, and as such the study is designed as an interpretive case study where I have tried to make meaning from a rich, thick description of a specific case context. The school is located in Bizana, one of the villages in the O.R. Tambo District Municipality in the Eastern Cape Province,, and is currently in the process of implementing South Africa’s new National Curriculum Statement (NCS) like all other schools in South Africa. In conducting the research I observed lessons, interviewed the learners and teachers, and a community member and the manager of the SANBI greening project, and I also analysed documents which included the NCS for Life Orientation, and teachers planning documents and learners work produced in the lessons. I started the study by conducting a document analysis of the NCS, through which I identified dimensions of the Official Pedagogic Discourse. This was used as a framework to review the lessons to understand how the OPD was being recontextualised. The study concludes by discussing the key findings of the study in the form of a set of analytical statements. Some of the findings indicate that teachers have not been given adequate training for understanding and implementing the NCS which affects the recontextualisation process. The study shows that there is a dire need for professional development if the OPD is to be interpreted adequately by teachers so that its implementation at the meso and micro- levels becomes clear and effective.
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Muhizi, Theoneste. "The extraction, purification and evaluation of compounds from the leaves of Leonotis Leonorus for anticonvulsant activity." Thesis, University of the Western Cape, 2002. http://hdl.handle.net/11394/1609.
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Magister Scientiae - MScThe aim of this study is to isolate and evaluate the anticonvulsant components from the leaves of Leonotis leonorus (L) R.aR. and to see if there is any change in activity with the origin of the plant material and I or the season in which plant material is collected. Therefore, in this study, two sites were chosen for collection of plant material and the collection was made in summer and in winter. Chemical, physical and pharmacological methods were used to isolate, identify and to evaluate compounds isolated from the leaves of Leonotis leonorus for anticonvulsant activity.
South Africa
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Polori, Ketlareng Liza. "The medicinal properties of ipomoea oblongata E.Mey. ex Choisy." Thesis, Bloemfontein: Central University of Technology, Free State, 2014. http://hdl.handle.net/11462/671.
Full textAbstract:
Thesis (M. Tech. (Biomedical Technology)) -- Central University of Technology, Free State, 2014.Traditional medicine has been known by mankind since ancient times as a healthcare system. All cultures have used herbs throughout history and it was an integral part of the development of modern civilization. Primitive man observed and appreciated the great diversity of plants available to him. Plants provided food, clothes, shelter and medicine and still play a vital role in rural villages of South Africa. The medicinal uses of plants and animals have been developed through trial and error. Herbal plants produce and contain a wide variety of chemical substances that act upon the body’s immune system. The medicinal properties of Ipomoea oblongata (E.Mey.ex Choisy) in this study was to determine the phytochemical content, antioxidant, anti-cancer and anti-diabetic properties of I. oblongata (Mothokho), a medicinal plant used by traditional medical practitioners of Thaba-Nchu in the Free State. The study was carried out in order to validate the ethnomedicinal claims made by the traditional medical practitioners and to evaluate the plant’s potential as a novel therapeutic agent. Twelve traditional medical practitioners of the Kopanang Dingaka Association were interviewed on the knowledge and use of I. oblongata (Mothokho). The phytochemical constituents of the plant were determined using standard screening methods. Testing for antioxidant properties (free radical scavenging activity) was carried out by means of the 2, 2- diphenylpicrylhydrazyl (DPPH) assays. The Sulforhodamine B assay was used to screen for anti-cancer activity in breast (MCF7), colon (HCT116) and prostate (PC3) cancer cell lines. Glucose uptake in C2C12 muscle cells was used to evaluate the anti- iii diabetic potential of I. oblongata. Methanol extract was fractionated using Ultra-Pure Liquid Chromatography (UPLC) to identify active compounds. The traditional medical practitioners cited the plant roots as the main ingredient in the treatment of respiratory infections, sexually transmitted infections, postnatal womb treatments, inflammation, arthritis, wounds and cancer. The methanol extract of I. oblongata showed remarkable (99.03%, 98.39, 71.31%) antioxidant potential in all triplicates tested which explains its use in oxidative stress-related diseases such as arthritis and cancer. Phytochemical tests showed the presence of carbohydrates, glycosides, steroids, terpenoids, alkaloids, flavonoids and tannins. However, the extracts were inactive against the cancer cell lines used. Glucose uptake by the C2C12 muscle cells was increased by over 150% and was comparable to that of insulin and metformin, suggesting good anti-diabetic activity. Predicted compounds found were dihydroquercetin pentaacetate, actinorhodin and actinorhodine, using Chemspider analysis. These are possible compounds that could be found in the Ipomoea oblongata extracts when using nuclear magnetic resonance (NMR) to determine the structure and names of the active compounds. Ethnobotanical uses of Ipomoea oblongata were found to have a link with other ethnobotanical studies to capture the indigenous knowledge, culture and therapeutic uses. The phytochemical results of Ipomoea oblongata can contribute to the knowledge of new drug development as indicated by literature (Harbone; 1973, Soforowa, 1993; De et al., 2010) that plants contain phytochemical contents and phenolic compounds that are valuable as medicinal properties. Methanolic extract of Ipomoea oblongata presented high levels of antioxidant activity respectively, which can become a potential iv antimicrobial agent and remedy oxidative stress related diseases. The anticancer properties were inactive and the cytotoxicity levels were found to below in I. oblongata. Low levels of cytotoxicity allow medicinal plants to be consumed by humans with fewer side effects however doses must be standardized. High levels of glucose uptake in muscle cells were indicated from the aqueous extract of Ipomoea oblongata, therefore showing great potential as an antidiabetic agent. Many medicinal plants have been validated as antidiabetic therapeutic agents in South Africa and the world. New treatment of cancer, diabetes, bacterial and viral infections is required from natural products that are cost effective with minimal side effects that can be used in health care systems. There is a correlation between the medicinal properties found in I. oblongata and the ethnomedicinal uses cited by the traditional medical practitioners. The plant I. oblongata has six ethno-pharmaceutical uses. I. oblongata is a good source of anti-diabetic and antioxidant agents that can be developed further. However the plant is not a good source of anticancer properties. Future research will be into the isolation and identification of the active compounds.
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Mbandezelo, Mongikazi. "Bioactive compounds in a Manayi traditional medicinal product from East London." Thesis, Cape Peninsula University of Technology, 2016. http://hdl.handle.net/20.500.11838/2450.
Full textAbstract:
Thesis (MTech (Chemistry))--Cape Peninsula University of Technology, 2016.In Africa, herbal medicines are often used as primary treatments for a variety of ailments and diseases including HIV/AIDS and for HIV-related problems. In general, traditional medicines are not well researched scientifically in controlled studies, and are poorly regulated. Since the pharmacological effectiveness of natural products is affected by several native and foreign factors, studies on the variations of chemical composition and biological activity of these medicines are necessary. The processes of investigating plants to identify chemical substances are of great interest to natural product researchers because there is a need to discover new drugs for treating old and new diseases. These facts underscore an urgent need to develop new anti HIV and AIDS drugs with fewer or no side effects. Research into drug discovery and development using natural products is increasingly becoming better established. Marine organisms as a source of natural products delivered numerous novel compounds with multiple pharmacological properties. Natural products give endless opportunities for discovering novel compounds that can be used as drugs or backbones of drug leads. Manayi is a natural product that has been used to treat and manage people with HIV, but no scientific studies have been done to prove its efficacy on the HIV under controlled conditions. For the purposes of this study, cooked and uncooked Manayi product was evaluated for its efficacy on HIV in vitro. Manayi samples were collected in East London, Eastern Cape and sequentially extracted with hexane, chloroform, dichloromethane, butanol, methanol, and water as a series of increasingly polar solvents for its bioactive chemical constituents.
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Weideman, Liezel. "An investigation into the antibacterial activities of medicinial plants traditionally used in the Eastern Cape to treat secondary skin infections associated with burn wounds." Thesis, Nelson Mandela Metropolitan University, 2005. http://hdl.handle.net/10948/172.
Full textAbstract:
Traditional medicine has a long history of being used for treating various ailments ranging in severity. Although traditional medicine has typically been the health care for the poorest levels of society, there is a worldwide growth in popularity. The growing popularity of traditional medicine, termed the green boom, may be ascribed to people taking a more holistic approach to maintain their health. Traditional medicine is widely used on a regular basis by 70% of South Africans. Various indigenous medicinal plants are used for the preparation of traditional herbal medicine. These plants are mostly indigenous to the regions were it is used. In this study four medicinal plants (Bulbine frutescens, Leonotis leounurus, Melianthus major & Zantedecshia aethiopica) that are traditionally used in the Eastern Cape region for treating burn wound infections, were collected for investigation. The in vitro antibacterial activity of these plants was tested against different bacterial strains of eight different bacteria. The bacteria used in this investigation included bacterial strains of four Gram-positive bacteria, S. aureus, methicillin-resistant S. aureus (MRSA), E. feacalis, S. pyogenes and four Gramnegative bacteria, P. aeruginosa, A. baumanii, K. pneumoniae and P. mirabilis. Traditional preparations as well as three different extracts (methanol, aqueous & acetone) of the plants were used for in vitro antibacterial activity testing. The microtitre plate assay and agar dilution assay were used for determining the antibacterial activity of the traditional preparations and plant extracts against the different bacterial strains. In the microtitre plate assay the antibacterial activity was tested using the bacterial growth indicator, INT and a microtitre plate spectrophotometer to determine the minimal inhibitory concentrations of the plant extracts and traditional preparations. The microtitre plate assay was used for testing the antibacterial activity of the plants against the bacterial strains of five bacteria, S. aureus, MRSA, P. aeruginosa, A. baumanii and K. pneumoniae. The bacterial strains of the three bacteria, S. pyogenes, E. feacalis and P. mirabilis were not compatible with the microtitre plate assay using INT and spectrophotometric readings to determine bacterial inhibition. Therefore the agar dilution assay were used as an alternative method for determining the MIC’s of the plant extracts against the bacterial strains of these bacteria. The initial plant extract concentration in the microtitre plate assay differed with the different plant extracts in the microtitre plate assay. Acetone followed by methanol extracted the highest plant extract concentrations with the different medicinal plants. M. major followed by L. leonurus produced the highest plant extract concentrations following extraction with the different extraction solvents. Consequently the acetone extract of M. major had the highest plant extract concentration before serial dilution in the microtitre plate assay. Uniform plant extract concentrations were tested in the agar dilution assay. The methanol extract followed by the acetone extract of the plants gave the highest antibacterial activity against the different bacterial strains. The extracts of M. major followed by L. leonurus inhibited the highest number of bacterial strains in the microtitre plate assay and the extracts of B. frutescens inhibited the lowest number of bacterial strains. The acetone and methanol extracts of M. major were the only extracts that displayed antibacterial activity in the agar dilution assay. The bacterial strains of P. mirabilis were the only bacteria that were inhibited using this method. The bacterial strains of S. pyogenes and E. feacalis were not inhibited at any of the plant extract concentrations in the agar dilution assay.
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Dilika, Fikile. "The medicinal value of Amaryllidaceae and Asteraceae species used in male circumcision." Thesis, Connect to this title online, 2002. http://upetd.up.ac.za/thesis/available/etd-04112007-153554/.
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Kwinda, Pfanani Charlotte. "Development and implementation of nutrion strategies to improve the application of a food-based dietary guideline for use by créche caregivers in Thulamela Limpopo Province, South Africa." Diss., University of Pretoria, 2010. http://hdl.handle.net/2263/25897.
Full textAbstract:
Many of the world’s children, particularly those living in developing countries, subsist on diets that seldom vary and often do not allow for an adequate intake of the complete range of nutrients required for healthy living. Of concern is the absence of regular consumption of fresh vegetables and fruit that provide vitamin A which, if deficient, impairs children’s growth and development. In South Africa about 21% of children under the age of six years attend crèche facilities on a daily basis. The nutritional state of meals provided to children at many crèches tends to lack micronutrients, particularly vitamin A. Vitamin A deficiency is the main nutritional problem facing crèche children in South Africa today. Underlying causes are unsatisfactory diets restricted in variety and minimal knowledge of optimal dietary practices, a situation exacerbated by a high incidence of food insecurity. Limpopo is a province seriously affected by vitamin A deficiency. A South African study, based on a quantitative research paradigm, was undertaken (April-September 2007) in Thulamela municipality with the aim of developing and implementing nutrition strategies to improve crèche children’s consumption of vitamin A-rich vegetables and fruit, as advocated by an officially recognised food-based dietary guideline. Through convenience sampling, 100 caregivers from 20 crèches in the study area responded to questionnaires and participated in a game. Ongoing observation continued. Information about the participants, their nutrition knowledge and the meals provided was collected following the triple-A cycle approach (assessment, analysis and action). The research process was structured in three phases. Phase one involved a situational assessment and analysis that provided baseline information. Limitations contributing to the problem under investigation were identified and data showed that the children’s intake of vitamin A from vegetables and fruit at crèches was low. This was found to be due to a lack of knowledge and information about vitamin A, coupled with the unavailability and inaccessibility of food primarily due to non-production and affordability. Food preparation, storage and preservation also posed challenges to caregivers. Using evidence from documented studies and the findings from phase one, nutrition strategies were developed and implemented in phase two. Caregivers were shown how to increase the availability and use of foods rich in vitamin A and were encouraged to grow, and use, both cultivated and non-cultivated vitamin A-rich vegetables and fruit. Furthermore, the concept of the food-based dietary guideline “eat plenty of vegetables and fruits everyday” was introduced to the caregivers and became part of the developed nutrition strategies. Follow-up data collected in phase three showed substantial advancement in caregivers’ knowledge and skills. Access, availability and utilisation of vitamin A-rich vegetables and fruit had improved markedly. Flourishing vegetable gardens, planned menus and well prepared meals were concrete evidence, and vegetables and fruit were more frequently served to children. Implementation of the developed nutrition strategies epitomised the envisaged outcome of this study. Based on the research results, important recommendations are made to enhance the appropriate consumption of vegetables and fruit rich in vitamin A, leading to a reduction in disease and death caused by vitamin A deficiency among children.Dissertation (MConsumer Science)--University of Pretoria, 2010.
Consumer Science
unrestricted
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Pretorius, Rudolph Johannes. "A plant health management system for aphididae on lettuce under variable shadehouse conditions in the central Free State, South Africa." Thesis, Bloemfontein : Central University of Technology, Free State, 2008. http://hdl.handle.net/11462/114.
Full textAbstract:
Thesis (M. Tech) --Central University of Technology, Free State, 2008Aphids (Hemiptera: Aphididae) are amongst the most destructive insects in agricultural crop production systems. This reputation stems from their complex life cycles which are mostly linked to a parthenogenetic mode of reproduction, allowing them to reach immense population sizes within a short period of time. They are also notorious as important and efficient vectors of several plant viral diseases. Their short fecund life cycles allow them to be pests on crops with a short growth period, e.g. lettuce (Lactuca sativa L.). It is common practice to provide this crop with some degree of protection from environmental extremes on the South African Highveld. Shadehouses are popular in this regard, but aphids are small enough to find their way into these structures, and their presence on lettuce is discouraged due to phytosanitary issues. In addition, the excessive use of insecticides is criticized due to the negative influence on human health, and because aphids can rapidly develop resistance. This necessitates the use of alternative control options in order to suppress aphid numbers. Biological control is popular in this regard and the use of predatory ladybirds (Coleoptera: Coccinellidae) is a popular choice. This study investigated the aphid and coccinellid species complex encountered under varying shadehouse conditions on cultivated head lettuce in the central Free State Province (South Africa). Their seasonality was also examined, along with variations in their population size throughout a one-year period. Finally, the impact of varying aphid populations on some physical characteristics of head lettuce was examined, and recommendations for aphid control (using naturally occurring coccinellid predators) were made. Two shadehouse structures were evaluated during this study. One was fully covered with shade netting and designed to exclude the pugnacious ant, Anoplolepis custodiens (Hymenoptera: Formicidae), while the other was partially covered with shade netting (on the roof area) allowing access to the ants. Six cycles of head lettuce were planted and sampled four times during each cycle. These were scheduled to monitor the seedling, vegetative and heading stage of lettuce. Four important aphid species were recorded on the lettuce, namely Acyrthosiphon lactucae, Nasonovia ribisnigri, Myzus persicae and Macrosiphum euphorbiae. Both structures harboured similar aphid and coccinellid species, but their population dynamics differed. A. lactucae dominated in the absence of A. custodiens in the fully covered structure (whole study), while N. ribisnigri dominated in the partially covered structure in the presence of these ants during the warmer months (December – January). M. euphorbiae replaced this species as the dominant species in the absence of A. custodiens (April – September). M. persicae occured during the winter (May – August) in the fully covered structure. Promising coccinellid predators were Hippodamia variegata and Scymnus sp. 1, and to a lesser extent, Exochomus flavipes and Cheilomenes lunata. However, the fully covered structure hampered the entrance of the larger adult coccinellid species, resulting in their lower occurrence. Aphid and coccinellid activity peaked during the summer months (October – January), and the fully covered structure attained the highest aphid infestation levels and coccinellid larval numbers during this time. On the other hand, aphid numbers were higher in the partially covered structure during the cooler months of the year (April – July) and this structure also harboured more adult coccinellids. In most cases, aphid infestation levels did not affect the amount of leaves formed. However, symptomatic damage in terms of head weight reduction did occur under severe infestation levels. Specific environmental conditions within a shadehouse structure concurrently contributed to this reduction, with less favourable conditions accelerating this condition. Results from this study have shown that even though the type of shadehouse structure does not influence the insect species complex found on lettuce, it does have an influence on detrimental and beneficial insect population dynamics. Aphid species infesting lettuce have been identified, along with coccinellid predators that could potentially be used in their control. Both types of structures had advantages and disadvantages, and therefore, decisions concerning shadehouses should not be focused on which type of structure to use, but rather which type of structure to use during different seasons of the year.
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Mhlontlo, Simphiwe. "Effects of sheep kraal manure and intercropping with maize on growth, nutrient uptake and yield of a vegetable Amaranthus accession in the central region of the Eastern Cape, South Africa." Thesis, University of Fort Hare, 2008. http://hdl.handle.net/10353/76.
Full textAbstract:
Amaranthus is among the nutritious indigenous plant species that are gathered from the wild in the Eastern Cape to prepare a traditional meal known as ‘imifino’ or ‘isigwampa’ to supplement the necessary proteins, vitamins and minerals which are poor in maizebased meals. Amaranthus species are adapted to wild conditions unsuitable for exotic vegetables and could be cultivated but information on its fertility requirements, as sole or intercrop, is the key for its domestication and production as a leafy vegetable, particularly where manure is used. Two dry-land and one glasshouse experiments were conducted to study the effects of sheep kraal manure application rate, intercropping with maize and soil type on growth, fresh and dry matter yields, nutrient uptake and grain yield of a local Amaranthus accession that grows wild in the Eastern Cape. Sheep kraal manure rates ranging from 0 to 10 t ha-1 and an NPK {2:3:4(30) + 0.5% Zn} fertilizer as a positive control, applied at rates recommended for spinach, were tested. In the Gqumahashe experiment, where Amaranthus was grown as a sole crop, low manure rates (≤ 2.5 t ha-1) resulted in plant heights and fresh matter yields which were comparable to those in the unfertilized control, whereas higher rates (5 and 10 t ha-1) and recommended NPK fertilizer had higher levels both at 30 and 60 days after transplanting (DAT) at p < 0.05. At 30 DAT, manure application rates of ≥ 2.5 t ha-1 and the NPK fertilizer treatment, produced greater shoot dry-matter yields (29.35, 30.75 and 37.68 g plant-1) than the unfertilized control (17.11 g plant-1) at p < 0.05. Uptake of N and P in the leaves increased with increase in manure application rate with N uptake reaching a maximum (308 mg plant-1) at a manure rate of 2.5 t ha-1 which corresponded with the maximum dry matter yield. There was no effect of manure rate or fertilizer on residual soil N and Ca, whereas P, K, Mg and Zn increased. In a pot experiment with soils from Ntselamanzi and Gqumahashe Villages, manure rates ≥ 2.5 t ha-1 resulted in plant heights and fresh matter yield that compared well with the NPK fertilizer treatment in the Gqumahashe soil whereas only the 10 t ha-1 manure treatment was comparable to the NPK fertilizer treatment in the Ntselamanzi soil. Only treatments with ≥ 5 t ha-1 manure had stem girth (1.00 and 1.07 cm) that compared well to NPK fertilizer (1.03 cm) in the Ntselamanzi soil whereas in the Gqumahashe soil, all manure levels compared well to NPK fertilizer (1.02 cm). However, no significant difference was observed in plant height and stem girth and fresh matter due to soil type. In both soils, the 1.3-10 t ha-1 manure treatments had dry leaf weight comparable to plants fertilized with NPK fertilizer (3.72 g plant-1 for the Ntselamanzi soil and 3.65 g plant-1 for the Gqumahashe soil) and were bigger than the unfertilized control (2.2 g plant-1 for the Ntselamanzi soil and 1.38 g plant-1 for the Gqumahashe soil) at p < 0.05. Uptake of N, P and K increased as result of manure application but nonetheless, it was less when compared to plants fertilized with NPK fertilizer in both soils. In a field intercropping experiment carried out at Ntselamanzi, growth and yield of sole and intercropped Amaranthus plants grown with manure improved when compared to the unfertilized control and compared well to NPK fertilizer. At 30 days after transplanting (DAT), both sole and intercropped plants grown with ≥ 2.5 t ha-1 manure had fresh and dry matter yield comparable to plants fertilized with NPK fertilizer. At 60 DAT, intercropped plants grown with all manure levels had bigger fresh matter yield when compared to unfertilized control (836.0 g plant-1) whereas for sole cropped plants only those grown with ≥ 2.5 t ha-1 compared to NPK fertilizer (1467.7 g plant-1) at p < 0.05. Uptake of N, P, K, Ca and Mg increased with increase in manure application in both sole and intercropped Amaranthus. Whereas Amaranthus did not suffer from the competition in the intercrop, maize biomass and grain yield were severely reduced with the effects being evident after 60 DAT. Based on results of this study, it is therefore suggested that, if Amaranthus is to be intercropped with maize under dry land conditions of the Central Region of the Eastern Cape, sheep manure should at least be applied at rate of ≥ 2.5 t ha-1 and Amaranthus be harvested at 30 DAT.
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Ramabulana, Vusani. "Empowerment of women in the Mangondi and Tshisahulu gardening projects in the Northern Province." Thesis, 2012. http://hdl.handle.net/10210/5634.
Full textAbstract:
M.A.In the former Republic of Venda, many people lost their jobs when industries that had mushroomed during the 1980's pulled out of the area. This happened just prior to the collapse of the Bantustan government. The most affected were women who, because of lack of education, could not get employment within and outside of the province. As a way of alleviating poverty, people resorted to selfemployment and community development projects. Different community development projects were started throughout Venda. Some non-governmental organisations (NGOs) helped women who were unemployed by giving them training and help them to start projects such as sewing, knitting, chicken farming, creches and small-scale gardening. The training of people in different skills was done as a way of helping to equip communities so that they may start projects that they could manage, and that could become selfsustainable. The new South African government, through its Reconstruction and Development Programme (RDP), also assisted the poverty-stricken rural areas to start generating projects that would generate jobs for the people. These programmes involved the communities, the NGOs and the government through the RDP. Short and long term projects that were considered suitable by the members and community developers in the different areas were started. In order to maintain the smooth running and the co-ordination of all their projects, many communities instituted Community Development Committees (CDC). The CDC was an umbrella body within a community whose members had been elected by the community itself. The main task of the CDC was to help the different `Community Development Project' (CDP) committees responsible for the different projects within the community to obtain funds from different sources. They also helped to organise training for interested project members. In most cases, they worked hand in hand with the civic association committees and the traditional leaders, as well as the community members themselves. In this study, I have compared the activities of the community gardening projects within two rural communities. These two gardening projects are at Mangondi and Tshisahulu rural areas in Venda within the Northern Province. In their attempts to fight unemployment and poverty, these two communities (like many other communities within the Province and Venda in particular) embarked on the establishment of several community development projects, gardening being one of them. Most of the gardeners in these two projects are women. These women vary in age, education and family situations. The aim of this study was to establish the problems facing rural women in their attempts to free themselves from the grip of poverty and unemployment that continues to render them marginalised. The provision of government policy on the problem of women's rights on land ownership was also examined. The method of research used in the collection of data during field work was the interview method. This method was most preferred because it allowed me an opportunity to ask questions directly to these gardeners most of whom cannot read or write. A literature study was done on the role and activities of women in small gardening projects and the development process. It is my wish that this work be of assistance to the development workers and the policy-makers as well as the RDP officers of the Northern Province under which this area falls.
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Pappas, Anastasia. "Feed.u.cation: propagating urban spaces through an educational food facility." Thesis, 2016. http://hdl.handle.net/10539/22967.
Full textAbstract:
Thesis (M.Arch. (Professional))--University of the Witwatersrand, Johannesburg, Faculty of Engineering and the Built Environment, 2016Globalisation is a considerable catalyst for the state of the world today, and so it is evident through industrialisation, modernism and capitalism that the power and spatiality of food has shifted. Food has always brought people together as it is an universal language that is understood by everyone. However food no longer exists as this valued product of necessity but has now become a product of consumerism. Large corporations control our food industry which has lead to an economic food crisis where our basic needs have become too expensive. This is a consequence of increased population, demands, immoral farming methods and greed. Not only is it affecting our economies but our natural resources. Food production systems need to change along with our attitude towards the environment. In an age of technology, branding and mass production, people have become disconnected from nature, regarding the food we eat and where it comes from. In South Africa, this has resulted in increased food insecurity, obesity, malnutrition and health risks. The necessity of honest, healthy and nutritious clean-living has been lost. So how can we overcome this pressure before we collapse as a society and as a planet? The quality of food affects our daily productivity, well-being and psyche, our primal need. How can architecture instigate a change for the free food philosophy? How can it challenge profit margins in the food system through urban contexts by re-establishing our connection with nature? Investigating the journey through the history of farming, politics and food, I will observe the gradual change in the food industry from the farmer to corporation to consumer, exposing the cultural power plays, which can be reconsidered through architecture. This thesis proposes an holistic approach towards propagating parks and public spaces through food education in an urban context. It concentrates on re-igniting the relationship between man and nature through small-scale agriculture using small-scale architecture: ‘agritechture’. Establishing its roots in Joubert Park, Park Station Precinct, Johannesburg, the strategy unfolds biophilia characteristics observing the intricacy of Persian architecture and soil structures stimulated by modular systems, grid proportions and layering. The prairie ecosystem becomes a precedent study for heterotopian architecture rooting itself as homogeneity. Creating catalytic nodes of urban renewal, it unifies communities while defending its territory, similar to the original African settlement, ‘the Kraal’.
MT2017
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Lekotoko, Queen Lebogang. "A home gardening training programme to alleviate household food insecurity for low income household dwellers." Thesis, 2008. http://hdl.handle.net/10352/291.
Full textAbstract:
M. Tech. (Food Service Management, Department of Hospitality and Tourism, Faculty of Human Sciences) -- Vaal University of Technology|INTRODUCTION: Urban agriculture (UA) is increasingly being seen as an important component of urban development and urban environmental management. Urban agriculture is an alternative source of employment, household income, food and nutrition security among many low-income urban dwellers. Investments in Urban agriculture in South Africa are negatively influenced by a paucity of information on available land and farming opportunities and lack of policy. A situation analysis in Eatonside concluded that high unemployment rates, income-poverty, chronic household food insecurity and a high prevalence of malnutrition existed. Efforts to increase food availability will bring overall benefits to the community. OBJECTIVES: The main objective of this project was to conduct an empirical study to assess food insecurity training needs in order to develop an appropriate home gardening training programme for gardeners in the informal settlements. METHODS: A random selection of 143 households was made from the informal settlement (refer baseline), but only 91 dwellers successfully completed the questionnaires that were administered by four trained field workers. The resu Its were analysed using the SPSS® 12.0 program. MAJOR FINDINGS AND IMPLICATIONS: The results showed that 72.5 percent had some knowledge of home gardening, whereas 29.7 percent had skills at all in home gardening; 69.2 percent responded that they had some knowledge of soil management, while 69.2 percent had no knowledge regarding planting management and only 13.2 percent had any knowledge regarding storage after harvesting and preparation of vegetables. Out of all the 91 participants, only 29.7 percent had ever worked in a garden. The researcher and fieldworkers were the first group to be trained so that they could conduct the training of the participants with the assistance of the farmers. Since the patiicipants were both male and female, no problems were encountered with digging the ground, as every day after training the males made a point of preparing the ground for the next day. Training was conducted over two days for each group; there were four groups including the fieldworkers. Groups 2 and 3 had 25 participants each while group 4 had 41 participants (n = 91). On day one, the trainers provided all the theory that the participants would need to work in a garden. On day two, the trainers incorporated theory with practical training which involved the participants. CONCLUSION It was found that most of the householders who participated in this project owned a vegetable garden. Most of the participants felt that they had benefited greatly from the training given in the gardening project, both because they were now able to have year round access to fresh vegetables, and because of the money-saving aspect
NRF -- CRC
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Selepe, Bolyn Mosa. "The impact of home gardens on dietary diversity, nutrient intake and nutritional status of pre-school children in a home garden project in Eatonside, the Vaal triangle, Johannesburg, South Africa." Thesis, 2010. http://hdl.handle.net/10413/8469.
Full textAbstract:
Urban agriculture is a strategy poor urban, informal settlement residents adopt to reduce
poverty and improve food security and child nutrition. It is widely asserted in the literature
and development circles that household vegetable gardens can provide a significant
percentage of recommended dietary allowances of macro- and micro-nutrients in the diets of
pre-school children. These children are vulnerable in terms of food access and nutrition. The
first five years of a child’s life are crucial to psychological well-being. This study set out to
determine the impact of home gardens on access to food, dietary diversity and nutrient intake
of pre-school children in an informal settlement in Eatonside, in the Vaal Region,
Johannesburg, South Africa.
The home gardening project was undertaken in five phases, namely the planning phase; a
baseline survey (including quantitative food intake frequencies, 24-hour recall, individual
dietary diversity questionnaires and anthropometric measurements); a training programme on
home gardens; planting and tending the gardens and evaluating the impact of home gardens
on access to food, dietary diversity and nutrient intake of pre-school children.
Children aged two to five years (n=40) were selected to participate in the study. The sample
population consisted of 22 boys and 18 girls. The children were categorised into three groups
at the start of the project: children of 24-35 months (four boys and one girl), 36-47 months
(four boys and five girls) and 48-60 months (14 boys and 12 girls). All but 10 per cent of the
children’s consumption of foods in the food groups increased. At the start of the project, low
consumption rates were observed for white tubers and roots, vitamin A-rich fruit, other fruit
and fish. After the gardening project, the number of children consuming vegetables increased
considerably. There was an increase in the intake of food groups over the period of the
project. The number of children consuming vitamin A-rich increased the most, with all
children (45 per cent improvement) consuming vitamin A-rich vegetables at the end of the
project, compared with just over half at the start of the project. The consumption of
vegetables increased with 78 per cent of the children consuming beans and 33 per cent
beetroot. Most children (95 per cent) consumed cabbage, carrots and spinach post-home
gardening. Seventy eight percent of children consumed beans by the end of the project, but
only a third of the children had consumed beetroot during the post-project survey period.
Intakes of all nutrients considered in the study improved by the end of the project, except for
energy and calcium, which dropped marginally, but both remained at around 50 per cent
below requirements.
Twenty five percent of boys (24-35 months) were underweight and below the 50th percentile
at the pre- and post-project stages. The same boys were severely stunted (on average -4.41
standard deviations below the third percentile). Of the boys aged 36-47 months, 25 per cent
were stunted pre-project, but by the end of the project, this number had decreased to 50 per
cent. Twenty one per cent of the older boys (48-60 months) were within their normal height
for age.
Twenty five per cent of girls were underweight (36-47 months). A slight change was
observed in the 36-47 month group, where the mean changed from -0.14 standard deviations
(below 50th percentile) pre-project to -0.5 (below 50th percentile) post-project. All girls aged
24-35 months were below -2 standard deviations pre-project. After the home gardening
project, the figure dropped to 50 per cent. For girls aged 36-47 months, 25 per cent were
below -3 standard deviations after the project, compared with 20 per cent pre-project. Height-for-
age for girls aged 36-47 months dropped by 10 per cent below -2 standard deviation post-home
gardening. Girls from 24 to 35 months were severely stunted [-3.02 (below 3rd
percentile) pre- and -2.31 (below 5th percentile) post-project]. Stunting was observed in 36-47
months girls who had means of -2.39 (below 3rd percentile) and 1.86 (below 25th percentile)
both pre-and post-gardening respectively and were at risk of malnutrition. The older girls
were well nourished with means of height-for-age at -0.88 (below 50th percentile) pre-project
and -0.92 (below 50th percentile) post-project.
Home-gardening improved food access, dietary diversity, energy, protein, carbohydrate, fat,
fibre, vitamin A and iron intakes, but did not make a significant impact on the malnutrition
of the children in the project or ensure adequate intakes. Home gardens had a positive
impact on height-for-age scores; but had no significant impact on mean weight-for-age and
height-for-weight z-scores of the pre-school children. Increases in carbohydrate and fat
intakes were shown to have the only significant impact on the children’s nutritional status
and only with regard to improving height-for-age scores. The results show that the gardens
did not have the expected impact on children’s nutrition, but confirm that increases in
incomes from gardening are likely to have a greater impact through savings from consuming
produce grown and selling produce to buy energy-dense foods for the children. This needs
to be considered in nutrition interventions.Thesis (Ph.D.)-University of KwaZulu-Natal, Pietermaritzburg, 2010.
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Mudzinganyama, Tatenda Charmaine. "A livelihood analysis of the contribution of community gardens to food security in Msunduzi and uMngeni Municipalities in KwaZulu-Natal, South Africa." Thesis, 2012. http://hdl.handle.net/10413/10588.
Full textAbstract:
South Africa is a net food exporter, however, scores of households in the rural and peri-urban and urban areas are food insecure. Some households in the peri-urban areas of uMngeni and Msunduzi Municipalities of KwaZulu-Natal have sought to alleviate their households from food insecurity through community gardens, which are widely promoted and used as a means to increase food supply. This study was centred on a livelihood based analysis of the contribution of community gardens to food security in Msunduzi and uMngeni Municipalities, KwaZulu-Natal. A survey was conducted among 46 participants and data was collected through the use of Livelihood- based Participatory Analysis (LiPA) tools. LiPA emerged as a tool for analysis with the development of sustainable livelihoods approach. Livelihood analysis made use of participatory methods to evaluate the following Framework of African Food Security indicators: improvement of risk management and resilience; increase in supply of affordable food; increase in economic opportunities for the vulnerable; and improvement in dietary diversity. Gardening helped to supply the participants with fresh produce, however, gardening did little to improve the participants risk management and economic opportunities. Drought, theft and insects were identified as the major factors limiting the success of community gardens. Despite the challenges, the community gardeners were indeed benefiting from community gardening therefore, further research could be carried out to compare food security among households involved in community gardening and those not involved.Thesis (M.Sc.Agric.)-University of KwaZulu-Natal, Pietermaritzburg, 2012.