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Dissertations / Theses on the topic 'Plant extracts and phytochemicals'

Author: Grafiati
Published: 10 September 2021
Last updated: 1 February 2022

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1

Kumar, Suresh. "In vitro effects of medicinal plant extracts and phytochemicals on factors implicated in Alzheimer's disease." Thesis, University of Newcastle Upon Tyne, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.577147.

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BACKGROUND: Alzheimer's disease (AD) is a complex, multifactorial neurological disorder characterized by an insidious onset with progressive symptoms of memory impairment, language deficit, behavioural problems including agitation, mood disturbances and poor judgment. AD involves multiple pathogenetic factors such as A~ production and aggregation, oxidative stress, tau protein aggregation, metal ions (e.g. Cu2+, Zn2+, Fe2+) and reduced levels of acetylcholinesterase (AChE) and butyrylcholinesterase (BuChE) enzymes. All these factors play important roles in neurodegeneration associated with AD.
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2

Champagne, Donald Edmond. "Insect antifeedant and growth regulating activity of phytochemicals and extracts from the plant family Meliaceae." Thesis, University of British Columbia, 1989. http://hdl.handle.net/2429/29069.

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This thesis represents studies on aspects of the defenses against insect herbivores in species of the plant family Meliaceae, particularly with regard to phytochemicals. Methanolic extracts of foliage from thirty species in twenty-two genera were bioassayed for toxicity and growth inhibitory activity against the variegated cutworm, Peridroma sauciaf and for feeding inhibition against the migratory grasshopper, Melanoplus sanguinipes. All but three species were inhibitory to P. saucia, members of the tribe Melieae being most inhibitory. Members of the subfamily Melioideae were more active than
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3

Mbandezi, Yamkela. "Evaluation of cytotoxic activity of gold nanoparticles naturally synthesised from South African indigenous medicinal plant extracts." University of the Western Cape, 2018. http://hdl.handle.net/11394/6786.

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>Magister Scientiae - MSc<br>Nanotechnology has emerged as a promising field in the quest to address health conditions. Green nanotechnology is a fairly new branch of nanotechnology, which aims to produce and utilize nanomaterials in a way that is safe for living organisms and their environment. Plant extracts are increasingly used in the green synthesis of gold nanoparticles (AuNPs), which involves the reduction of sodium tetrachloroaurate (III) dehydrate by phytochemicals present in the plant extract. It is probable that the green synthesised AuNPs are more biocompatible than chemically synt
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4

Helal, Racha [Verfasser]. "Biopharmaceutical investigations of the effects of immune-modulatory plant extracts and phytochemicals on lysozyme expression in human cells / Racha Helal." Berlin : Freie Universität Berlin, 2011. http://d-nb.info/1025490010/34.

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5

Harris, Taahir. "Bambara groundnut (Vigna subterranean) from Mpumalanga province of South Africa: phytochemical and antimicrobial properties of seeds and product extracts." Thesis, Cape Peninsula University of Technology, 2017. http://hdl.handle.net/20.500.11838/2789.

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Thesis MTech (Food Technology))--Cape Peninsula University of Technology, 2017.<br>Bambara groundnut (Vigna subterranea) an indigenous legume cultivated in Sub-Saharan Africa has been proclaimed to have medicinal properties from communities and in rural areas. However, there is not enough scientific information to validate these claims. Therefore, this study aimed to identify possible medicinal properties of Bambara groundnut (BGN), by analysing the phytochemical and antimicrobial properties of BGN seed and product extracts from Mpumalanga province within South Africa. The BGN extracts (70% me
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6

Staffa, Pumla. "Anti-tick activities of extracts of Tulbaghia violacea (Alliaceae) cultivated in hydroponic media amended with entomopathogenic fungi (Hypocreales)." Thesis, Cape Peninsula University of Technology, 2018. http://hdl.handle.net/20.500.11838/2830.

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Thesis (MTech (Horticulture))--Cape Peninsula University of Technology, 2018.<br>Ticks and tick-borne diseases are important limiting factors to the attainment of sustainable animal and human health, affecting livelihood of resource poor farming communities in developing countries. Rhipicephalus appendiculatus and Amblyomma variegatum (Ixodidae) are among the most troubling tick species in Africa. While ticks can be controlled by applying chemical acaricides, these chemicals are quite expensive, especially, for small-scale famers in developing countries. Hence, the quest for alternative tick c
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7

Al-Marby, Adel [Verfasser], and Claus [Akademischer Betreuer] Jacob. "Nematicidal and antimicrobial evaluation of extracts, nanosized materials and fractions of selected plants and the identification of the bioactive phytochemicals / Adel Al-Marby ; Betreuer: Claus Jacob." Saarbrücken : Saarländische Universitäts- und Landesbibliothek, 2017. http://d-nb.info/1142919730/34.

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8

Vicente, David Gil Marques Borrero. "An overview of the role of cytochrome P450 enzyme system in food-drug interactions and possible applications in veterinary medicine." Bachelor's thesis, Universidade Técnica de Lisboa. Faculdade de Medicina Veterinária, 2009. http://hdl.handle.net/10400.5/1003.

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Dissertação de Mestrado Integrado em Medicina Veterinária<br>Cytochrome P450 enzymes (CYP) are hemoproteins belonging to the group of monooxygenases and one of the main enzymatic systems responsible for drug metabolism. In the present study, in vitro approach was applied to evaluate the relation of CYP-catalyzed activities between human, rabbit, minipig and mouse, using single substrate assays (MultiCYP 7-ethoxycoumarin 0-deethylase (ECOD), CYP1A1/2 7-ethoxyresorufin 0- deethylase (EROD), CYP2A6 coumarin 7-hydroxylase (COH), CYP3A4 midazolam 1- hydroxylase (OH-MDZ), and CYP2E1 chlorzoxaz
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9

Maciel, Mônica Jachetti. "Atividade antibacteriana de antibióticos, de desinfetantes e de extrações vegetais sobre Salmonella padrão e Salmonelas isoladas em produtos de origem animal." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2015. http://hdl.handle.net/10183/131252.

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O gênero Salmonella constitui um problema para a saúde animal e humana. Com a finalidade de evitar a ocorrência da transmissão deste microrganismo e a interrupção da doença provocada por eles, deve-se utilizar desinfetantes e antibióticos. A exposição continuada a estes agentes pode resultar no surgimento de resistência microbiana. Tendo em vista este fenômeno, a pesquisa por novos agentes antimicrobianos a partir de extratos vegetais se faz necessária, pois existe a possibilidade de se encontrar substâncias eficazes contra a resistência de micro-organismos já disseminados no ambiente. Os obje
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10

Adefuye, Ogheneochuko Janet. "Anti-diabetic and phytochemical analysis of sutherlandia frutescens extracts." Thesis, Nelson Mandela Metropolitan University, 2016. http://hdl.handle.net/10948/3549.

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In Africa, the importance of medicinal plants in folklore medicine and their contribution to primary healthcare is well recognized. Across the continent, local herbal mixtures still provide the only therapeutic option for about 80% of the population. The vast floral diversity and the intrinsic ethnobotanical knowledge has been the backbone of localized traditional herbal medical practices. In Africa, an estimated 5400 of the 60000 described plant taxa possess over 16300 therapeutic uses. Similarly, with a therapeutic flora comprising of approximately 650 species, herbal medical practitioners i
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11

Girlus, Elena Valeria. "Protective activity of phytochemicals from natural extracts." Master's thesis, Instituto de Tecnologia Química e Biológica António Xavier. Universidade Nova de Lisboa, 2016. http://hdl.handle.net/10362/43593.

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The rise in the incidence of neurodegenerative diseases leads to an increased demand for the development of alternative therapeutic strategies. Phytochemicals have proved beneficial effects for human health, exerting protective roles towards several diseases including neurodegenerative disorders. Thus, the search for new bioactivities is a field in constant growth. The beet and fruits belonging to Opuntia spp. are rich in betalains and phenolic compounds, which confer several benefits to human health such as regulators of antioxidant and anti-inflammatory responses as well as potential protect
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12

Okoh, Omobola Oluranti. "Chemical transformations and phytochemical studies of bioactive components from extracts of Rosmarinus officinalis L." Thesis, University of Fort Hare, 2010. http://hdl.handle.net/10353/354.

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Variations in the yield, chemical composition, antibacterial, and antioxidant properties of the essential oils of Rosmarinus officinalis L. cultivated in Alice, Eastern Cape of South Africa over a period of 12 months using the solvent-free microwave extraction and traditional hydrodistillation methods were evaluated. The GC-MS analyses of the essential oils revealed the presence of 33 compounds with 1,8-cineole, a-pinene, camphor, verbenone, bornyl acetate and camphene constituting about 80 percent of the oils throughout the period of investigation, with the solvent-free microwave extraction m
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13

Strawson, Steven William. "Fine chemicals from plant extracts." Thesis, Bangor University, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.539908.

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14

Njume, Collise. "Phytochemical analysis and bioactivity of selected South African medicinal plants on clinical isolates of Helicobacter pylori." Thesis, University of Fort Hare, 2011. http://hdl.handle.net/10353/449.

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Medicinal plants have been used as traditional medicine in the treatment of numerous human diseases for thousands of years in many parts of the world. In the developing world, especially in rural areas, herbal remedies continue to be a primary source of medicine. Scientifically, medicinal plants have proven to be an abundant source of biologically active compounds, many of which have already been formulated into useful therapeutic substances or have provided a basis for the development of new lead molecules for pharmaceuticals. Antibiotic resistance, undesireable side effects and expences asso
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15

Chan, Nicholas. "Separation and purification of high value phytochemicals from plant biomass." Thesis, University of Ottawa (Canada), 2008. http://hdl.handle.net/10393/27962.

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Phytochemicals are the individual chemicals from which plants are made and are alternatively referred to as natural products, which have been used since ancient times as drugs. In modern times, natural products are still used as drugs; however, more importantly they are used as a source of new leads into new bioactive compounds. Paclitaxel and betulinic acid, in particular are prized for their characteristics as anti-cancer compounds among other traits. The following work examines the extraction of paclitaxel from Taxus canadensis on a pilot scale set-up using Dynamic Pressurized Liquid Extra
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16

Sagbo, Idowu Jonas. "Phytochemical analysis and antibacterial properties of aqueous and ethanol extracts of Brachylaena elliptica (Thurb.) dc. and Brachylaena ilicifolia (Lam.) Phill & Schweick." Thesis, University of Fort Hare, 2015. http://hdl.handle.net/10353/d1021289.

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Resistance of human pathogenic bacterial strains results in selective pressure against known antibiotic. However, plant derived compounds that possess antibacterial potential are currently being investigated for treatment of wound infections in diabetic patients as they are inexpensive and non-toxic. Hence, this dissertation was designed to evaluate two medicinal plants (Brachylaena elliptica and Brachylaena ilicifolia) traditionally used in the treatment of various diseases such as diabetes, and its secondary complications in diabetic patients. The in vitro antioxidant activity of both plants
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17

Debbri, Hawa Abdulgader. "Plant extracts as treatment for diabetes mellitus." Thesis, University of Glasgow, 1996. http://theses.gla.ac.uk/2113/.

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The herbal extract of Artemisia has been regarded to be anti-hyperglycaemic since olden times and is commonly used by diabetics in Libya. The present work was designed to evaluate, test and determine which fraction or component of the herb had the hypoglycaemic effects in normal and streptozotocin-induced diabetic rats. The plant extract was administered to the animals in their drinking water and body weight, food and fluid intake and urine volume were all monitored daily. Food and fluid intake and body weight gain in normal rats were not altered by treatment with the plant extract but there w
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18

Moshref, Mahmood. "Investigation of plant extracts for antimicrobial activity." Thesis, University of Sheffield, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388711.

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19

Salloum, Gregory Stewart. "Insect growth inhibitors from asteraceous plant extracts." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26529.

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Petrol and ethanolic extracts of six asteraceous weeds were added to artificial diet and screened for inhibition of larval growth on variegated cutworm, Peridroma saucia (Hbn.). Petrol and ethanolic extracts of Artemisia tridentata and Chamomilla suaveolens and ethanolic extracts of Chrysothamnus nauseosus and Centaurea diffusa were highly inhibitory at five times the naturally occurring concentrations. The two C. suaveolens extracts and the ethanol extract of A. tridentata were active at the natural concentration (100%) and were further examined at 20, 40, 60, and 80% of this level. Inhibitio
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20

Silva, Inês Alexandra Marreiros. "Evaluation of chemotherapeutic potential of natural extracts using 3D models of colon cancer." Master's thesis, Faculdade de Ciências e Tecnologia, 2013. http://hdl.handle.net/10362/10982.

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Dissertation to obtain master degree in Biotechnology<br>Recently there is a growing interest in cancer treatment through the use of natural compounds. In particular, phenolic compounds and monoterpenes found in fruits and vegetables are very attractive in the prevention and chemotherapy of various types of cancer. However, many promising compounds previously tested in in vitro cell models fail to demonstrate activity when evaluated in vivo. Therefore, there is an emerging need to develop more robust and reliable cellular models for pre-clinical evaluation of new chemotherapeutic agents. The
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21

Ahmad, Nema Ali. "Applications of modified plant extracts in controlling parasites." Thesis, Bangor University, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.664602.

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Parasitic diseases remain a major public health problem affecting hundreds of millions of people, particularly in tropical developing countries. Pharmaceutical research in natural products represents a major strategy for discovering and developing new drugs. The use of medicinal plants for the treatment of parasitic diseases is well known and documented since ancient times. Saponins are a structurally diverse class of compounds occurring in many plant species, and possessing a number of desirable biological and pharmacological activities. In this work methodology was developed to extract, isol
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22

Loron, Anne. "Chitosan polymers and plant extracts to develop biofungicides." Thesis, Bordeaux, 2021. http://www.theses.fr/2021BORD0002.

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Les cultures céréalières sont sujettes aux invasions de champignons pathogènes, ce qui altère la qualité des grains et pose un problème de santé publique, en raison de mycotoxines potentiellement contenues dans ces grains. Face à la prise de conscience publique et politique de la nécessité d’inclure la composante environnementale dans nos modes de consommation et de production, les fongicides synthétiques traditionnels se voient petit à petit remplacés par des alternatives plus « vertes ». Dans ce contexte, ce travail de thèse a pour but de créer une formulation à base de produits renouvelable
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23

Pung, Thitiya. "The Isolation of Natural Products From Plant Extracts." Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/33973.

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Bioassay-guided fractionation of the ethyl acetate extract of Virola sp. (Myristicaceae) using the Sc7 yeast strain resulted in the isolation of the weakly cytotoxic biochanin A (an isoflavone compound). The bioassay of three mutant yeast strains (1138, 1104, and 1353) directed the isolation of DNA-damaging alkaloids from Solanum hostmannii. These alkaloids were identified as verazine and (20R) epimer verazine. In addition, three oxoaporphine alkaloids were isolated from the bark of Papualthia sp. (Annonaceae). Oxocrebanine and atherospermidine showed DNA-damaging activity whereas liriod
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24

Oh, Myungmin. "Plant adaptation and enhancement of phytochemicals in lettuce in response to environmental stresses." Diss., Manhattan, Kan. : Kansas State University, 2008. http://hdl.handle.net/2097/673.

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Hughes, Michael Douglas Jr. "Investigating the Influence of Fresh and Aged Garlic Extracts on the Biosynthesis of Trimethylamine N-Oxide." Diss., Virginia Tech, 2021. http://hdl.handle.net/10919/101785.

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Introduction: Garlic-derived organosulfur compounds are associated with physiological benefits, including the reduction of cardiovascular disease (CVD) risk, possibly by reducing the risk marker trimethylamine-N-oxide (TMAO). TMAO production in humans is largely influenced by the metabolic activity of the intestinal bacteria on dietary precursors including L-carnitine. Dietary supplementation of bioactive garlic phytochemical allicin has recently been suggested to reduce the formation of TMAO precursor molecule trimethylamine (TMA) from L-carnitine through impact on the intestinal bacteria, th
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Otienoburu, Philip E. "Plant Semiochemicals as Mosquito Attractants." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1313605670.

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Daigneault, Luce. "A study of crude and fractionated willow extracts for rooting /." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=63114.

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Ilsley, Siân Elizabeth. "Plant extracts as dietary supplements for reproductive sows and piglets." Thesis, University of Leeds, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.411302.

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Palaty, Jan. "Oxidative coupling of dibenzylbutanolides catalyzed by plant cell culture extracts." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/29710.

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This thesis aims to develop a new and inexpensive synthetic route to the anti-cancer drug etoposide (6) via 4'-demethylpodophyllotoxin (4) or 4'-demethylepipodophyllotoxin (5) involving the oxidative coupling of a dibenzylbutanolide catalyzed by a cell-free extract (CFE) from plant cell culture. This step was studied in depth using the Catharanthus roseus CFE-catalyzed biotransformation of frans-2-(3,5-dimethoxy-4-hydroxybenzyl)-3-(3-hydroxy-4-methoxybenzyl)butanolide (58) to 1-(3,5-dimethoxy-4-hydroxyphenyl)-6-hydroxy-3-hydroxymethyl-7-methoxy-1,2,3,4-tetrahydro-2-naphthoic acid γ lactone (5
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Kudi, Ayuba Caleb. "Antiviral and antibacterial screening of some Nigerian medicinal plant extracts." Thesis, University of Leicester, 2000. http://hdl.handle.net/2381/29814.

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Plants from Northern Nigeria with a history of use in both human and veterinary traditional medicine have been investigated in vitro, for antiviral and antibacterial activity and their cytotoxicity against human cells in culture determined. Aqueous extracts were tested against poliovirus, astrovirus, human and Equine herpes simplex virus and canine and bovine parvovirus, using the microtitre plate inhibition test. Most of the extracts were non toxic to cells in culture and had activity against more than one virus at a dose rate of between 100 and 400 g/100. the most effective of the plant extr
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Mawela, Kedibone Gloria. "The toxicity and repellent properties of plant extracts used in ethnoveterinary medicine to control ticks." Diss., Pretoria : [s.n.], 2008. http://upetd.up.ac.za/thesis/available/etd-02162009-151403/.

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Odei-Addo, Frank, and Ruby-Ann Levendal. "Leonotis leonurus: understanding the mechanism of anti-diabetic action and investigating a nano drug delivery system." Thesis, Nelson Mandela Metropolitan University, 2016. http://hdl.handle.net/10948/13116.

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Diabetes mellitus is a metabolic disease characterised by hyperglycaemia resulting from defects in insulin secretion, insulin action, or both. The leaf extract of Leonotis leonurus and its active compound marrubiin, have been shown to possess anti-diabetic, antiplatelet, anti-inflammatory and anti-coagulation activity. In the present study, the mechanism by which L. leonurus and marrubiin exert their anti-diabetic properties, the cross-talk between the peripheral tissues and a nano drug delivery system were investigated. Marrubiin in the plant extract was effectively quantified by an optimised
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Bordoh, Paa Kwesi. "Integrated postharvest management of anthracnose in dragon fruits using plant extracts." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/48293/.

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Integrated Postharvest Management of Anthracnose in Dragon Fruits Using Plant Extracts The study was conducted to develop an environmentally, biodegradable, non-toxic and sustainable bio-fungicide using the formulation where each plant crude extract (ginger, turmeric and “dukung anak”) at different concentrations were incorporated separately with 10% gum Arabic (GA). The formulation was assessed against a wide range of parameters such as disease incidence (DI) and severity (DS) as well as postharvest quality (physicochemical and nutritional) on dragon fruits during storage at 11±20C, 80% RH fo
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Zaimoglu, Selin. "Inhibitiory Effects Of Plant Originated Extracts On Bovine Lens Aldose Reductase." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/2/12605076/index.pdf.

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Aldose reductase, E.C.1.1.1.21, catalyzes the reduction of different types of aldehydes to their corresponding alcohols, and especially reduces various aldo-sugars using NADPH as the coenzyme. Under hyperglycemic conditions aldose reductase is involved in the development of diabetic complications. As a result, interest has been placed over the years on the development of potent aldose reductase inhibitors for possible use in the therapy of these severe diabetic complications. In this study, aldose reductase was isolated from bovine lens by differential centrifugation and ammonium sulfa
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Odumosu, Patricia. "Evaluation of the plant extracts of an anti-tubercular herbal remedy." Thesis, University of Sunderland, 2012. http://sure.sunderland.ac.uk/3330/.

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Ximenia americana root bark (Olacaceae) and Pavetta crassipes (Rubiaceae) leaf used in Nigerian traditional medicine were tested individually against clinical isolate of Mycobacterium tuberculosis by Lowenstein - Jensen method. Crude aqueous extracts of X. americana and P. crassipes exhibited minimum inhibitory activity (MIC) of 100 μg/mL and 200 μg/mL respectively. Sequential screening with solvents of different polarities was used in evaluation tests to readily locate the source of the activity against tuberculosis and for conditions related to skin diseases since it was readily available. I
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Zheng, Zongping, and 郑宗平. "Isolation and structural elucidation of tyrosinase inhibitors from five plant extracts." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B45700072.

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Kapewangolo, Taatsu Petrina. "Lamiaceae plant extracts and isolated compounds demonstrate activity against HIV/AIDS." Thesis, University of Pretoria, 2013. http://hdl.handle.net/2263/40262.

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Background: HIV/AIDS remains a major health concern worldwide and the number of people infected in Sub-Saharan Africa continues to increase. This despite increased awareness and availability of HIV drugs in most countries. The success of current HIV-1 drugs is overshadowed by the emergence of drug resistant viral strains and the adverse side-effects they may cause. It is these limitations and many more that drives the continuous search for better HIV treatments. Research into drug discovery and development using natural products is becoming better established. With natural products, the
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Kelani, Madeha Mohammed. "Antibacterial activity of some South African plant extracts against streptococcus mutans." University of the Western Cape, 2015. http://hdl.handle.net/11394/4745.

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Magister Scientiae (Medical Bioscience) - MSc(MBS)<br>Good oral health has a major influence on the general quality of life and well-being. Several chronic and systemic diseases have been attributed to poor oral health. With the increasing incidence of oral diseases, the global need for alterative prevention and treatment methods and safe, effective, and economical products has expanded. There are many studies showed that Streptococcus mutans has been implicated as major etiological agent of dental caries. South African has very rich natural flora especially Cape region. Several South African
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Belewa, Xoliswa Vuyokazi. "The effect of tulbaghia violacea plant extract on the growth of aspergillus species." Thesis, Nelson Mandela Metropolitan University, 2009. http://hdl.handle.net/10948/d1008186.

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Traditional medicine has become an important part of healthcare worldwide. It is estimated that about 25 percent of prescribed medicines contain plant products or active compounds derived from plants. In South Africa, traditional medicine forms part of the culture and tradition of most communities. Garlic compounds have been shown to have a variety of antimicrobial properties. Amongst these are antifungal, antibacterial, antiviral and anti protozoal activities. Allicin and its breakdown products have been shown to be the main active compounds which possess these properties. Tulbaghia violacea
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Jones, Sarah Jane. "Metal-binding peptides in root extracts of Mimulul guttatus." Thesis, University of Liverpool, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317137.

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Lyddiard, James Robert Alexander. "Studies on the mode of action of plant allelochemical of relevance in schistosomiasis control." Thesis, King's College London (University of London), 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266513.

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Novais, Renata Zoccal. "Avaliação da resposta tecidual dos extratos vegetais aquoso e hidroalcoólico de araçá (Psidium cattleianum) pela análise edemogênica e morfológica em ratos /." Araçatuba : [s.n.], 2008. http://hdl.handle.net/11449/95481.

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Resumo: Atualmente, tem se verificado um grande avanço científico envolvendo os estudos químicos, farmacológicos e microbiológicos de plantas medicinais que visam obter novos compostos com propriedades terapêuticas. A demonstração de notável atividade antimicrobiana de extratos aquoso e hidroalcoólico de Araçá (Psidium cattleianum) sobre a microbiota bucal e a busca de substâncias que reúnam tais propriedades resguardando os princípios biológicos, nos levam a considerar uma possível utilização clínica desse extrato como coadjuvante na terapia odontológica. Desta forma, o objetivo deste estudo
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Hudson, Christine Cecilia. "Isolation of signal transduction inhibitors by bioassay-directed fractionation of plant extracts." Diss., Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/30636.

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Hussain, Shayne. "Evaluation of microbial extracts for contamination control in plant tissue culture systems." Thesis, University of Plymouth, 1991. http://hdl.handle.net/10026.1/2716.

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Culture filtrates of 13 microbial antagonists exhibited in vitro growth inhibition of a range of test contaminations of herbaceous and woody plant tissue culture systems. Filtrates produced by Bacillus subtilis and Trichoderma viride isolates displayed the greatest broad- range inhibitory activity. Microscopic analysis of antagonized fungal mycelia revealed altered hyphal morphology. Maximum filtrate inhibitory activity was produced when selected antagonists were cultured within a pH range of 5-7 and a temperature range of 20-35°C. Filtrates were thermo-stable at 70°C and could be stored for u
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Ibrir, Fathia. "The use of plant extracts as anticoccidial feed additives in broiler chickens." Thesis, University of Leeds, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.411151.

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46

Rauha, Jussi-Pekka. "The search for biological activity in Finnish plant extracts containing phenolic compounds." Helsinki : University of Helsinki, 2001. http://ethesis.helsinki.fi/julkaisut/mat/farma/vk/rauha/.

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47

Andreu, Vanessa. "Valorisation de plantes invasives et rudérales : développement de biofongicides utilisables en phytoprotection." Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS004.

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Abstract:
Avec la prise de conscience de l'impact environnemental et sanitaire des pesticides et l'apparition de phénomènes de résistance face à ces produits, les exigences règlementaires européennes (UE 1107/2009) encadrant leur mise sur le marché sont de plus en plus drastiques. Pour répondre à ces exigences, de nouveaux types de produits de protection des cultures font leur apparition : les bio-pesticides, ou produits de biocontrôle. Il s'agit de produits naturels d'origine végétale, animale ou microbienne, à priori moins rémanent et impactant pour l'environnement que les pesticides conventionnels. C
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48

Farley, David Brian. "An investigation of the effects of aqueous extracts from green waste compost on plant growth and plant pathogens." Thesis, University of Exeter, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.414030.

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49

Mahsunah, Anis H. "Development and application of reversed phase liquid chromatography based techniques for automated purification of biologically active ingredients from plant extracts and for characterization of plant extracts and environmental pollutants." [S.l.] : [s.n.], 2007. http://deposit.ddb.de/cgi-bin/dokserv?idn=984081704.

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50

Mahsunah, Anis H. "Development and application of reversed phase liquid chromatography based techniques for automated purification of biologically active ingredients from plant extracts and for characterization of plant extracts and environmental pollutants." [S.l. : s.n.], 2006.

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