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Dissertations / Theses on the topic 'Natural pesticides'

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Published: 4 June 2021
Last updated: 25 July 2025

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1

Aigner, Elizabeth Jo. "Enantiomeric ratios and concentrations of organochlorine pesticides in Ohio soils /." Connect to online version, 1996. http://hdl.handle.net/1989/3567.

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2

NTALLI, NIKOLETTA. "Phytochemistry in the development of pesticides and biocides." Doctoral thesis, Università degli Studi di Cagliari, 2016. http://hdl.handle.net/11584/266867.

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To date biopesticides and biocides are studied as substitutes for their toxic synthetic ancestors. The botanical pesticides are evaluated as tools intended for integrated crop protection schemes, while the natural biocides for their potential use in residential areas. In this study we evaluate various botanical matrixes for the nematicidal properties against the root knot nematode Meloidogyne spp., in the form of pastes and extracts for soil amendment as well as plant secondary metabolites isolated from the afore mentioned matrixes and used individually or in binary mixtures to create synergis
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3

Dixon, Peggy L. "Pesticides and natural enemies (particularly ground beetles) of aphids on potato." Thesis, University of Edinburgh, 1987. http://hdl.handle.net/1842/27914.

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4

Burdge, Ryan Brennan. "Songbirds, Pesticides, and Golf Courses: Exposure and Effects." W&M ScholarWorks, 2009. https://scholarworks.wm.edu/etd/1539626888.

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5

Salvarani, Patricia Ishisaki. "Impact of contaminants in natural populations of marine turtles (Campeche, Mexico)." Doctoral thesis, Universidade de Aveiro, 2017. http://hdl.handle.net/10773/23764.

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Doutoramento em Biologia<br>As tartarugas marinhas sofrem um forte impacto populacional devido às atividades antropogênicas, como as causadas pelo aumento da exploração comercial e industrial nas áreas costeiras, alteração do habitat, ingestão de resíduos sólidos, captura acidental nas atividades pesqueiras e a contaminação de poluentes químicos. Das sete espécies de tartarugas marinhas existentes distribuídas por quase todos os oceanos (Caretta caretta, Chelonia mydas, Dermochelys coriacea, Eretmochelys imbricata, Lepidochelys olivacea, Natator depressus e Lepidochelys kempii), exceto
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6

Miller, Penney Leigh. "Photochemical transformation of agricultural pesticides promoted by natural water constituents in wetland surface waters /." The Ohio State University, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486399451961935.

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7

Elyassi, Ali. "Bioremediation of the pesticides dieldrin, simazine, trifluralin using tropical and temperate white-rot fungi." Thesis, Cranfield University, 1997. http://dspace.lib.cranfield.ac.uk/handle/1826/4654.

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The natural breakdown of three pesticides on the UK Red List (dieldrin, simazine and trifluralin) in water and soil varied with environmental conditions. In both sterile and unsterile water, trifluralin was degraded to some extent at 20 and 30°C. In contrast, dieldrin and simazine were stable over the 42 days incubation period. A gradient HPLC method was developed for the simultaneous quantification of the three pesticides in soil. In field capacity soil mixtures of the three pesticides (5 and 10 ppm) showed a similar stability with limited degradation at 20°C but increased rates of degradatio
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8

Ribeiro, Francisco Wirley Paulino. "Sensores e Biossensores EletroquÃmicos: Ferramentas VersÃteis para a DeterminaÃÃo de Contaminantes Ambientais." Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=12281.

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Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgico<br>No presente trabalho apresentou-se o emprego de sensores e de biossensores eletroquÃmicos para a determinaÃÃo dos pesticidas endossulfam (EDS), tiabendazol (TBZ) e cloridrato de formetanato (FMT) em amostras de cana-de-aÃÃcar, tomate, manga, uva e Ãguas naturais. AlÃm disso, informaÃÃes acerca do mecanismo redox dos pesticidas EDS, TBZ e FMT tambÃm foram apresentadas. Os sensores consistiram em eletrodos de gota pendente de mercÃrio (HMDE, do inglÃs Hanging Mercury Drop Electrode), de diamante dopado com boro (EDDB) e de carbono
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9

Cuthbertson, Andrew Garnet Steen. "The role of the predatory mite Anystis baccarum in Bramley apple orchards." Thesis, Queen's University Belfast, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326402.

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10

Morgado, Rui Guilherme da Costa. "Single and joint effects of natural and chemical stressors to the terrestrial isopod Porcellionides pruinosus." Doctoral thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/14138.

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Doutoramento em Biologia<br>Environmental contamination and climate changes constitute two of the most serious problems affecting soil ecosystems in agricultural fields. Agriculture is nowadays a highly optimized process that strongly relies on the application of multiple pesticides to reduce losses and increase yield production. Although constituting, per se, a serious problem to soil biota, pesticide mixtures can assume an even higher relevance in a context of unfavourable environmental conditions. Surprisingly, frameworks currently established for environmental risk assessments keep
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11

Gott, Ryan Christopher. "Development of gene expression-based biomarkers of exposure to metals and pesticides in the freshwater amphipod Hyalella azteca." Thesis, University of Maryland, College Park, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10128659.

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<p>Ecological risk assessment (ERA) is a framework for monitoring risks of exposure and adverse effects of environmental stressors to populations or communities of interest. One tool of ERA is the biomarker, which is a characteristic of an organism that reliably indicates exposure to or effects of a stressor like chemical pollution. Traditional biomarkers which rely on characteristics at the tissue level and higher often detect only acute exposures to stressors. Sensitive molecular biomarkers may detect lower stressor levels than traditional biomarkers, which helps inform risk mitigation and r
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12

CHAKOR, JYOTSNA NARAYAN. "SYNTHESIS AND BIOLOGICAL ACTIVITY EVALUATION OF NATURAL PRODUCTS AND THEIR ANALOGUES." Doctoral thesis, Università degli Studi di Milano, 2010. http://hdl.handle.net/2434/150172.

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The aim of the thesis entitled “Synthesis and biological activity evaluation of natural products and their analogues” is to synthesize some natural products and their analogues in order to study SAR and evaluate their biological activity as fungicides or herbicides. The thesis reports the first enantioselective synthesis of crassinervic acid in 12 steps and 11.8% overall yield. Crassinervic acid, recently isolated from leaves of Piper crassinervium by Kato and co-workers, shows high antifungal activity mainly against Cladosporium cladosporioides and Cladosporium sphaerospermum (minimum amoun
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13

Biondi, Antonio. "Combining natural enemies and selective pesticides in IPM programmes of exotic pests: the Tuta absoluta (Lepidoptera: Gelechiidae) case." Doctoral thesis, Università di Catania, 2013. http://hdl.handle.net/10761/1452.

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The recent invasion of the Mediterranean basin by the South American tomato pinworm, Tuta absoluta (Lepidoptera: Gelechiidae), has lead to a swift increase in insecticide applications in tomato crops. Such increase may compromise the tomato Integrated Pest Management (IPM) packages that were sustainable and commonly used by farmers. My work aimed at providing key bases for including indigenous biocontrol agents of T. absoluta in IPM programs on tomato in Europe. A survey carried out in 3 Italian regions demonstrated that T. absoluta was rapidly used as host by indigenous parasitoids. The recov
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14

Abountiolas, Marvin. "In Vitro and In Vivo Antioxidant Capacity of Synthetic and Natural Polyphenolic Compounds Identified from Strawberry and Fruit Juices." Scholar Commons, 2016. http://scholarcommons.usf.edu/etd/6057.

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Strawberries can be considered a functional food because their consumption has been associated with several health benefits. They are important sources of bioactive compounds, such as vitamins and polyphenolic compounds, with recognized antioxidant capacity (AOC). However, strawberry overall quality and bioactive content are greatly affected by environmental conditions during pre- and post-harvest and, little is known about the stability of its bioactive compounds, specifically ascorbic acid (AA) and polyphenolics compounds. Furthermore, additional research that addresses the impact of polyphe
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15

Tascone, Oriane. "Le suivi des xénobiotiques dans les extraits naturels destinés aux industries de la cosmétique, des parfums et des arômes alimentaires." Thesis, Nice, 2015. http://www.theses.fr/2015NICE4010.

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Les extraits naturels tels que les huiles essentielles, les absolues ou les résinoïdes utilisés en parfumerie, arômes et cosmétique sont produits à partir de matières premières naturelles. La culture de ces matières premières est souvent basée sur la monoculture et implique l'utilisation de pesticides. La réglementation pour les matières premières destinées à ces industries devient de plus en plus stricte en termes de niveaux résiduels autorisés de pesticides, en raison de leur impact sur la santé publique et sur l'environnement. Dans ce manuscrit, un état de l’art montrant la problématique po
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16

Mwanza, Patrick. "Determination of the effects of sunlight and UV irradiation on the structure, viability and reapplication frequency of the biopesticide cryptophlebia leucotreta granulovirus in the protection against false codling moth infestation of citrus crops." Thesis, Nelson Mandela Metropolitan University, 2015. http://hdl.handle.net/10948/6346.

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Cryptophlebia leucotreta granulovirus (CrleGV-SA) is a baculovirus specifically pathogenic to the citrus pest false codling moth, Thaumatotibia leucotreta. CrleGV- SA is formulated as a commercial biopesticide, Cryptogran® (River Bioscience, South Africa). The virus has a stable, proteinaceous crystalline occlusion body (OB) that protects the nucleocapsid. The major limitation to the use of baculoviruses is their susceptibility to the ultraviolet (UV) component of sunlight, which rapidly and greatly reduces their efficacy as biopesticides. The UVA and UVB components are the most destructive to
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17

Sbardelotto, De Bona Gicele. "STUDY OF THE CONTENT OF STILBENES ON GRAPE CANES WASTE. USE OF FOOD BY-PRODUCTS AS NATURAL PESTICIDES ON GRAPEVINE." Doctoral thesis, Università degli studi di Padova, 2018. http://hdl.handle.net/11577/3426815.

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Grapes (genus Vitis) are an important fruit crop from economic and cultural point of view in many countries of Europe, Asia and America. Currently, countries as France, Spain and Italy produce on average 7% of the fresh grape and 90% of the wine grape. At the same time, chemical pesticides are a ubiquitous element in agriculture and are among the most widely used chemicals in the world. In addition, grape canes represent a large source of waste derived from the viticulture industry, with an estimated volume of 1−3 t/ha/year. Likewise, the seafood processing industry produces a large quantity o
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18

Leitão, Sara Pais de Almeida da Silva. "New improvements on pesticide ecological risk assessment on the soil-water interface." Doctoral thesis, ISA, 2013. http://hdl.handle.net/10400.5/6449.

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Doutoramento em Engenharia Agronómica - Instituto Superior de Agronomia<br>Improving knowledge to evaluate and reduce pesticide impacts in the environment is a present concern to achieve their sustainable use. With the aim of increasing ecological relevance on the environmental risk assessment of pesticides (ERA), an integrated approach was undertaken linking pesticide fate and effects on aquatic and terrestrial non-target organisms under irrigated crop-based scenarios in Mediterranean realistic conditions, for which there is a lack of studies. Pesticides fate and effects were assessed b
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19

Schmitz, Juliane [Verfasser]. "Assessing the effects of pesticides and fertilizers on a natural plant community of a field margin: An experimental field study / Juliane Schmitz." Landau : Universitätsbibliothek Landau, 2014. http://d-nb.info/1060774380/34.

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20

Marques, Ana Patrícia dos Reis. "Herpetofauna in caves of the Estremenho Karst Massif." Master's thesis, Universidade de Aveiro, 2018. http://hdl.handle.net/10773/22044.

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Mestrado em Ecologia Aplicada<br>The karst landscape has among other features and peculiarities, caves and scarce water at surface. The water rare at surface can be found underground in a complex hydrological network. In Portugal, karst massifs are distributed by two major zones, Lusitanian and Algarve basins. The Estremenho karst massif is the biggest massif of the country (around 900 Km2) and most of it is covered by the Serras de Aire and Candeeiros Natural Park (PNSAC). It has more than 2,000 caves and a great variety of habitats. In this territory are present 15 amphibians and 19 reptiles
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21

Hossain, Mohammad Babul. "Effects of azadirachtin and the natural pesticides Spinosad and Avermectin on the leafminer Liriomyza sativae (Diptera: Agromyzidae) and its parasitoids on tomatoes under protected cultivation in the humid tropics." [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=979810469.

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22

Amara, Anis. "Évaluation de la toxicité de pesticides sur quatre niveaux trophiques marins : microalgues, échinoderme, bivalves et poisson." Phd thesis, Université de Bretagne occidentale - Brest, 2012. http://tel.archives-ouvertes.fr/tel-00795396.

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L'objectif de ce travail de thèse vise à analyser les effets de quelques pesticides et d'un adjuvant sur des organismes marins, représentatifs de quatre niveaux trophiques, à savoir des micro-algues, un échinoderme, des bivalves et un poisson. L'analyse de la pollu-sensibilité est basée sur l'utilisation de différents bio-essais existants ou adaptés au contexte de cette étude.Les tests de toxicité ont permis d'évaluer la sensibilité de trois espèces phytoplanctoniques (Chaetoceros calcitrans, Isochrysis aff. Galbana et Tetraselmis suecica) vis-à-vis d'un fongicide l'époxiconazole (pur et en fo
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23

Santos, Viviane Belo dos. "Desenvolvimento e validação de método multi-resíduos de pesticidas em tomate (Lycopersicum esculentum Mill) in natura por cromatografia líquida de alta frequência (CLAE)." Universidade Federal de Roraima, 2013. http://www.bdtd.ufrr.br/tde_busca/arquivo.php?codArquivo=218.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>Nos últimos anos, o consumo mundial de legumes e frutas aumentou, assim como o aumento no uso de defensivos agrícolas para garantir essa produção. Em decorrência disso, desenvolveu-se uma crescente preocupação dos cidadãos e da comunidade científica relacionada com a presença e o controle de resíduos de pesticidas nesses produtos. Para avaliar os riscos potenciais à saúde da população são estabelecidas medidas preventivas para que os efeitos indesejáveis sejam mantidos em níveis compatíveis com a vida, além de visar a proteção da r
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24

Ogla, Ali. "Halter av bekämpningsmedel i rå- och dricksvatten i Sverige." Thesis, Karlstads universitet, Institutionen för miljö- och livsvetenskaper, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-64596.

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Oönskade effekter av bekämpningsmedel (BM) har noterats i svenska vatten. Råvatten är råvara till dricksvatten, och i Sverige kommer råvatten ursprungligen från både yt- och grundvatten. Resultaten av vattenundersökningar i Sverige har visat innehåll av bekämpningsmedel i både rå- och dricksvatten. I denna studie presenteras halter av BM i rå- och dricksvatten i Sverige. Resultaten har visat att det finns signifikanta skillnader i både antalet och andelen prover med BM mellan rå- och dricksvatten. Resultaten har även visat att i Blekinge län har registrerats den högsta andelen av BM i dricksva
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25

Jukes, Michael David. "The isolation, genetic characterisation and biological activity of a South African Phthorimaea operculella granulovirus (PhopGV-SA) for the control of the Potato Tuber Moth, Phthorimaea operculella (Zeller)." Thesis, Rhodes University, 2015. http://hdl.handle.net/10962/d1017908.

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The potato tuber moth, Phthorimaea operculella (Zeller), is a major pest of potato crops worldwide causing significant damage to both field and stored tubers. The current control method in South Africa involves chemical insecticides, however, there is growing concern on the health and environmental risks of their use. The development of novel biopesticide based control methods may offer a potential solution for the future of insecticides. In this study a baculovirus was successfully isolated from a laboratory population of P. operculella. Transmission electron micrographs revealed granulovirus
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26

Nunes, Maria Edna Tenório. "Avaliação dos efeitos de agrotóxicos sobre a fauna edáfica por meio de ensaios ecotoxicológicos com Eisenia andrei (Annelida, Oligochaeta) e com comunidade natural de solo." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/18/18139/tde-24012011-140524/.

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Os impactos ambientais relacionados ao uso de agrotóxicos em áreas agrícolas vêm sendo considerados como preocupantes nas últimas décadas, verificando-se efeitos adversos em diferentes níveis de organização biológica nos ecossistemas terrestres e aquáticos e, consequentemente, com elevados riscos à saúde humana. No municipio de Bom Repouso, MG, com economia baseada na produção de batata e morango, a situação é similar, evidenciando-se a utilização intensiva e inadequada de agrotóxicos (mais de 80 produtos), muitos com alta periculosidade ambiental e toxicológica, entre eles o Vertimec® 18 EC.
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27

Tchikuala, Emílio Figueira. "Desenvolvimento de carvões ativados com base em novos percursos naturais oriundos de Angola." Doctoral thesis, Universidade de Évora, 2020. http://hdl.handle.net/10174/27845.

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Neste trabalho foi efectuada a produção de carvões activados a partir de desperdícios de madeiras naturais de Angola, designadamente madeira, casca e semente de Embondeiro e madeira de Njiliti, de Tchitiotioli, de Nuati, de Hama e de Candeia. Os materiais produzidos por activação com dióxido de carbono, ácido fosfórico e hidróxido de potássio foram devidamente caracterizados e efectuados estudos para aplicações em fase líquida. Por FTIR foi possível identificar nos CAs obtidos os grupos funcionais álcool, alcano, alceno, amida, ligações (C = O), nomeadamente quinonas , lactonas e piron
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28

Macedo, Danilo Silva de. "Desenvolvimento de método para determinação de pesticidas em grãos de milho (Zea mays) in natura por cromatografia líquida com detector DAD." Universidade Federal de Sergipe, 2015. https://ri.ufs.br/handle/riufs/6111.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>The corn (Zea mays) is considered a grain of social and economical importance. In Brazil, which Sergipe is a big producer of Northeast, the culture of corn is planted in all of the regions. However, this culture has been attacked by many pests, making necessary the use of some pesticides. This project intend to show the development of a method to analyse pesticide wastes atrazine, carbofuran, cyfluthrin, methyl parathion, pyraclostrobin, teflubenzuron in corn grains using as a extraction technic the matrix solid phase dispersion (M
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29

Aleixo, Adriana Mendes. "Sintese de produtos naturais oticamente ativos." [s.n.], 1993. http://repositorio.unicamp.br/jspui/handle/REPOSIP/248432.

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Orientador : Lucia H. B. Baptistella<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Quimica<br>Made available in DSpace on 2018-07-18T06:40:07Z (GMT). No. of bitstreams: 1 Aleixo_AdrianaMendes_M.pdf: 11906996 bytes, checksum: eaf5b006e4b8047971a8e3c05606b1b1 (MD5) Previous issue date: 1993<br>Mestrado
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30

Pastrana, Bertha Irina Gastelbondo. "Toxicidade e genotoxicidade do biopesticida Azamax™ em ovário e intestino de Ceraeochrysa claveri (Neuroptera:Chrysopidae)." Botucatu, 2019. http://hdl.handle.net/11449/190758.

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Orientador: Daniela Carvalho dos Santos<br>Resumo: O biopesticida Azamax™ tem sido utilizado como uma alternativa aos inseticidas sintéticos para o controle de pragas em plantações. Além disso, este produto tem obtido destaque por poder se associar ao uso de predadores naturais no controle biológico previsto pelo Manejo Integrado de Pragas (MIP). Dentre os modelos biológicos, destaca-se a espécie Ceraeochrysa claveri, sobretudo devido sua característica predadora na fase de larva com ampla variedade de presas e alto potencial reprodutivo na fase adulta. Embora a azadiractina, ingrediente ativo
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31

Mirgain, Isabelle. "Degradation bacterienne de deux pesticides (acetate de phenyl-mercure et atrazine) dans l'environnement naturel." Université Louis Pasteur (Strasbourg) (1971-2008), 1992. http://www.theses.fr/1992STR13068.

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Des bacteries prelevees dans l'environnement naturel ont ete isolees afin d'etudier in vitro leurs potentialites a metaboliser deux familles de xenobiotiques: les organomercuriels et les s-triazines. L'acetate de phenyl mercure et l'atrazine sont des pesticides dont les incidences sur les ecosystemes aquatiques, principalement les eaux souterraines, posent des problemes ecotoxicologiques pour la sante humaine. Des etudes sur le terrain ont revele notamment que, l'atrazine, herbicide selectif des cultures de mais, contamine annuellement la nappe phreatique sous-jacente de ces terres agricoles d
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32

Cerri, Fabiana. "Validação de metodologia para análise de procimidona em morango e determinação de seus resíduos na fruta \"in natura\" e produtos processados." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/11/11141/tde-15122008-145419/.

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O morango utilizado pela indústria alimentícia tem seu sabor e aroma bastante valorizados e apreciados, quando comparado com outras frutas. Entretanto, é um produto muito delicado e altamente perecível, exigindo, assim, o uso de técnicas adequadas de colheita e pós-colheita. Para manter sua qualidade e quantidade de produção, observa-se um aumento do uso de agrotóxicos para minimizar prejuízos causados por pragas e doenças do campo. Porém, os pesticidas podem deixar resíduos persistentes nos alimentos e o seu consumo in natura ou industrializado pode ficar comprometido, colocando em risco a sa
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33

Ansanay-Alex, Salomé. "Mise au point d'un nouvel échantillonneur intégratif à base de solide naturel poreux." Phd thesis, Université Nice Sophia Antipolis, 2013. http://tel.archives-ouvertes.fr/tel-01016693.

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L'échantillonnage passif est une alternative prometteuse à l'échantillonnage ponctuel. Cette technique permet d'accumuler les contaminants présents dans l'eau directement in-situ, intégrant ainsi les variations de concentrations temporelles qui ne sont pas détectables avec l'échantillonnage ponctuel. Cependant la plupart des échantillonneurs commercialisés actuellement utilisent des phases complexes et coûteuses. Ces travaux de thèse ont pour objectif de mettre au point un nouvel échantillonneur intégratif plus robuste et moins coûteux, capable d'échantillonner autant les contaminants métalliq
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34

Roca, Genovés Pascual. "Anàlisi de pesticides en aigües i sols mitjançant cromatografia líquida micel.lar." Doctoral thesis, Universitat Jaume I, 2017. http://hdl.handle.net/10803/481956.

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En la present memòria es desenvoluparen i validaren mètodes analítics per a determinar pesticides en mostres mediambientals (aigües residuals urbanes, agrícoles, de la indústria agroalimentària, d'EDAR, aigües decoratives i sols). Aquestes formulacions de pesticides s'utilitzen en diferents àmbits: agricultura, a les llars, per al manteniment d'edificis públics i privats (plantes decoratives, aquaris, neteja d'instal.lacions, material divers i superfícies), espais verds (jardins i fonts), vies de transport, etc. Es va fer ús d'una estratègia analítica basada en la injecció directa (aigüe
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Silva, Bianca Carvalho da. "Avaliação da toxicidade de quatro solventes e um surfactante, e dos fenilpropanoides eugenol e (E)-cinamaldeído sobre larvas e pupas de Musca domestica Linnaeus, 1758 (Diptera: Muscidae)." Universidade Federal de Juiz de Fora (UFJF), 2016. https://repositorio.ufjf.br/jspui/handle/ufjf/4062.

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36

Grbin, Lynne C. "Sublethal effects of Bacillus thuringiensis Berliner on the diamondback moth, Plutella xylostella (L.), and its natural enemy, Cotesia plutellae Kurdjumov : implications for resistance management." Title page, table of contents and summary only, 1997. http://web4.library.adelaide.edu.au/theses/09PH/09phg785.pdf.

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Bibliography: leaves 165-188. This research examines biological and behavioural interactions among the diamond-back moth, Plutella xylostella L. (Lepidoptera: Plutellidae), Cotesia plutellae Kurdjumov (Hymenoptera: Braconidae) and the microbial insecticide, Bacillus thuringiensis Berliner. A deterministic simulation model is developed describing the influence of C. plutellae on the evolution of resistance to Bt in a diamond-back moth poulation.
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37

Ferreira, Abel Luís Gonçalves. "Efeito da combinação de stressores químicos e naturais em Daphnia magna." Master's thesis, Universidade de Aveiro, 2007. http://hdl.handle.net/10773/749.

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Mestrado em Toxicologia e Ecotoxicologia<br>A contaminação ambiental é quase sempre caracterizada pela combinação de factores de stress de várias origens (biológica, química e física). Na agricultura, a grande diversidade de colheitas e das pestes que as atingem, conduz à utilização de diversos tipos de tratamentos e à aplicação de uma larga diversidade de produtos químicos. O fungicida carbendazim, pertencente ao grupo dos benzimidazóis, e é um dos mais utilizados em todo o mundo, enquanto que o insecticida organofosforado clorpirifos, também globalmente utilizado, é somente o mais ven
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38

Júnior, Paulo Roberto Vieira da Silva. "Ultramicroeletrodo de irídio com filme de mercúrio eletrodepositado para medidas in situ de íons metálicos e pesticidas em solos e águas naturais." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/75/75132/tde-26082009-094714/.

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Neste trabalho foram desenvolvidas metodologias para a determinação de substâncias de interesse, como metais pesados (micronutrientes e contaminantes), macronutrientes e pesticidas em solo e águas naturais com ultramicroeletrodo de irídio recoberto com filme de Hg eletrodepositado (UME Ir-Hg) e técnicas voltamétricas, utilizando uma cápsula porosa de cerâmica como cela eletroquímica. As metodologias de medidas com os ultramicroeletrodos foram desenvolvidas inicialmente em condições controladas e posteriormente aplicadas a medidas in-situ, com experimentos com águas naturais e solos, conduzidos
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39

Coste, Astrid. "Rôle des expositions environnementales aux rayons ultraviolets naturels et aux pesticides liés aux activités agricoles dans l’incidence des hémopathies malignes de l’enfant." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS354/document.

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Résumé : Cette thèse porte sur le rôle de deux expositions environnementales encore peu étudiées et pouvant influer sur l’incidence des hémopathies malignes (HME) de l’enfant : les rayons ultraviolets (UV) et les pesticides liés aux activités agricoles.Les leucémies (LA) et lymphomes de l’enfant sont les deux types principaux de HME et représentent respectivement environ 470 et 200 nouveaux cas par an en France. Leur prise en charge thérapeutique et leur survie ont fait d’immenses progrès, cependant la connaissance de leurs facteurs de risque est encore très partielle.Les études sur les effets
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40

Bergström, Emelie, and Johanna Bird. ""ÄTA BÖR MAN, ANNARS DÖR MAN" : En studie om möjligheten till implementering av lakto-ovo-vegetarisk och ekologisk kost i Eskilstuna kommuns förskola." Thesis, Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-25859.

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The purpose of this study was to describe the possibility of implementing a lacto-ovo-vegetarian and organic diet in Eskilstuna municipality’s public preschool. Furthermore the purpose was to identify and describe the most important components involved in the implementation and their influence in the process.  The methods used were a survey based on a literature study. This study includes general information about meat production and consumption and also the use of pesticides in farming. It also brings up the environmental and health effects caused by the previously mentioned areas. The effect
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41

He, Xuan (Sarah). "The use of naturally generated volatile fatty acids for pesticide removal during the denitrification process." Thesis, University of Canterbury. Civil Engineering, 2006. http://hdl.handle.net/10092/1169.

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The effect of naturally produced volatile fatty acids (VFAs) on the removal of 2, 4-D from a wastewater during the denitrification process was studied in this thesis. The VFAs were generated from an anaerobic digester using soya flour solution as a synthetic feed. The digester was operated at an SRT and HRT of 10 days. The pH (4.8 ± 0.2) and temperature (32 ± 3 ℃) of the digester were not controlled. A mean VFA concentration of 3153 ± 801 mg/L was achieved with acid speciation results of acetic (51.4 %), propionic (27.5 %), n-butyric (19.6 %) and iso-valeric (1.4 %). The specific VFA productio
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42

Soares, Susana Patrícia Veloso. "Paretic syndrome in gulls (Laridae) in the south of Portugal." Master's thesis, Universidade de Lisboa. Faculdade de Medicina Veterinária, 2014. http://hdl.handle.net/10400.5/6554.

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Dissertação de Mestrado Integrado em Medicina Veterinária<br>RIAS, a Portuguese wildlife rehabilitation centre located in Algarve, has been admitting a substantial high number of seagulls, since its opening in October of 2009, with consistent clinical presentations pertaining to a paretic syndrome without cues of a particular disease. This preliminary study describes the clinical signs and microbiological, parasitological, toxicological and pathologic findings of paretic gulls received between 2009 and 2012. It tries to understand if there is an association between the manifestation of th
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43

Lima, Maria dos Prazeres Rodrigues de. "Combined effects of chemical and natural stressors to soil organisms and plants." Doctoral thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/14766.

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Doutoramento em Biologia<br>Nas últimas décadas, a Terra tem experimentado um aquecimento global e mudanças nos padrões de precipitação. Muitos estudos sobre a avaliação de risco de agrotóxicos em organismos não-alvo foram realizados com base em protocolos padronizados, com condições abióticas controladas. Mas, em campo, os organismos são expostos a flutuações de vários fatores ambientais, bem como a poluentes, que podem alterar os limites de tolerância dos organismos aos stressores naturais, bem como alterar a toxicidade ou biodisponibilidade do químico em causa. Considerando isso, o principa
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44

Magalhães, Louise Lee da Silva. "Desenvolvimento e validação de método para determinação multirresíduo de agrotóxicos por cromatografia líquida de alta eficiência em uva in natura." [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/249849.

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Orientadores: Isabel Cristina Sales Fontes Jardim, Sonia Cláudia do Nascimento de Queiros<br>Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Quimica<br>Made available in DSpace on 2018-08-18T09:46:45Z (GMT). No. of bitstreams: 1 Magalhaes_LouiseLeedaSilva_D.pdf: 920587 bytes, checksum: 2181b3ef5653dc834d474ffbb6be4574 (MD5) Previous issue date: 2011<br>Resumo: Nos últimos anos, uma das considerações mais importantes no sistema produtivo de frutas é a capacidade de gerar produtos de qualidade e saudáveis, atendendo os requisitos de sustentabilidade ambiental, segurança alim
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45

Driutti, Artenio Angel. "Controle biologico natural de tripes, thrips tabaci lindeman 1888 (thysanoptera : thripidae) por sirfideos predadores em cebola (allium cepa) pelo cultivo de bordaduras ou entrelinhas." Florianópolis, SC, 1998. http://repositorio.ufsc.br/xmlui/handle/123456789/77586.

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46

Martínez, Heredia Jaime Teodocio. "Efecto de la temperatura sobre la acción tóxica del extracto acuoso de la raíz del "Lonchocarpus nicou" (barbasco) en ratas normales." Doctoral thesis, Universidad Nacional Mayor de San Marcos, 2012. https://hdl.handle.net/20.500.12672/12341.

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Evalúa el efecto tóxico del extracto acuoso de la raíz del Lonchocarpus nicou (Aubl) D.C. “Barbasco” sometido a 100 ºC de temperatura durante 5, 10, 30 y 60 minutos de ebullición, al ser administrado oralmente durante 30 días a ratas normales. El estudio es experimental, con grupos equivalentes randomizados, ciego para quien administró la solución, el analista de laboratorio, el anatomopatólogo y el estadístico. Se sometieron a 100 ºC de temperatura trozos pequeños de raíz desecados con agua destilada, obteniéndose extractos a 5, 10, 30 y 60 minutos de ebullición para efectuar ensayos fitoquí
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47

Quispe, Tippe Luis Gerardo. "Estudio de pre-factibilidad para la producción y exportación del barbasco en polvo como insumo de insecticidas y pesticidas naturales al mercado de los Estados Unidos." Bachelor's thesis, Pontificia Universidad Católica del Perú, 2016. http://tesis.pucp.edu.pe/repositorio/handle/123456789/7758.

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A través de los cinco capítulos del presente estudio de pre-factibilidad, se demuestra la factibilidad técnica, legal, económica y financiera de la implementación de una fábrica de molido de raíz de barbasco para su exportación al mercado de los EE.UU. En primer lugar, en el estudio estratégico se analizaron los factores macro y micro ambientales; se definieron la misión, visión y un análisis FODA que delimitó una estrategia genérica de diferenciación, industrializando el producto, promocionando su uso por sus características biodegradables y repotenciándola como alternativa a la hoja de
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48

Erazo, Sandoval Norma Soledad. "Desarrollo de un bionematicida para el manejo del Nematodo Meloidogyne spp en tomate Solanum lycopersicum L. en San Luis, provincia de Chimborazo." Doctoral thesis, Universidad Nacional Mayor de San Marcos, 2017. https://hdl.handle.net/20.500.12672/8089.

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Publicación a texto completo no autorizada por el autor<br>Desarrolla uno o más bionematicidas para el manejo del nematodo Meloidogyne spp. en cultivos de tomate en San Luis, provincia de Chimborazo, Ecuador. Para ello obtiene aislamientos de especies de hongos nativos con características nematofagas a partir de muestras de suelos procedentes de cinco agroecosistemas, selecciona e identifica los aislamientos de hongos con características nematofagas, mediante pruebas de mortalidad sobre poblaciones J2 del fitonematodo Meloidogyge spp, determina el efecto de sustratos sólidos en el desarrollo
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49

Figueiredo, Filho Luiz Carlos Soares de. "Desenvolvimento de minissensores de filme de bismuto para a determinação voltamétrica in loco de atrazina, diquat e paraquat em águas naturais." Universidade Federal de São Carlos, 2011. https://repositorio.ufscar.br/handle/ufscar/6485.

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Made available in DSpace on 2016-06-02T20:36:29Z (GMT). No. of bitstreams: 1 3452.pdf: 2283262 bytes, checksum: b35fc0c6b1b4c5e555f369b4a79c729a (MD5) Previous issue date: 2011-02-25<br>Universidade Federal de Minas Gerais<br>The development of bismuth film electrodes (BiFE) and minissensors/BiFE for application to the development of electroanalytical procedures for determination of atrazine, Diquat and Paraquat using voltammetric techniques as square wave (SWV) and differential pulse (DPV) is reported in this work. It was chosen to combine the working electrode (BiFE), pseudo-reference (sil
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50

Lima, Josiene Ferreira dos Santos. "Influência do cultivo da cana-de-açúcar nas nascentes do alto e baixo rio Japaratuba." Pós-Graduação em Desenvolvimento e Meio Ambiente, 2013. https://ri.ufs.br/handle/riufs/4238.

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The most aggravating factors in the context of agricultural activities correspond to the indiscriminate use of water, so it is necessary to take measures in relation to the actions of environmental damage related to predatory acts on the man / nature. Address issues that involve human actions on water takes us to a complex challenge, since there are numerous possibilities to approach. In this context, the research aimed to evaluate the influence of the cultivation of sugar cane in the headwaters of the Planning Units called Upper and Lower River Japaratuba. The research qualitative descriptive
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