Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 626 for “"Pesticides"”.
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Pesticides in the Aquatic Environment
Pesticides are ubiquitous contaminants of the freshwater aquatic environment. Pesticide residues are found in varying amounts in all components of the aquatic ecosystem including water, animal and plant tissue and sediments. Organochlorine pesticide residues in water, usually in the parts per …
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Crops, pesticides, and honey bee disease
… to the decline. These factors include pesticides, parasites and diseases, management practices, and nutritional factors. In order to help the mission to combat colony losses, I employ new methods to consider the environmental causes of honey bee disease. This thesis analyzes the spatial …
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Effects of Various Pesticides on Hyalella Azteca
The amphipod, Hyalella azteca, was described by Saussure in 1856. Weckel (1907) discussed the synonomy of the species and credited its discovery to Bate (1862), who classified this species as Hyalella knickerbockeri. | Depending upon age and sex, this small crustacean ranges from 2 to 7 mm in …
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Pesticides and pesticide combinations on brain neurochemistry
Pesticides have been suggested to play a role in the development of many neurodegerative diseases including Parkinson's disease and Alzheimer's disease. Additionally, it has been suggested that exposure to pesticides and other environmental chemicals during the early stages of life could result in …
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Effects of water treatment on pesticides in freshwaters.
… treatment processes for the removal of selected pesticides from freshwaters. Of particular interest were the herbicides likely to contaminate water courses used for potable water supplies in Grampian Region. Laboratory based simulation experiments were set up to determine the removal of …
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Sorption and degradation of pesticides in biopurification systems
The increasing use of pesticides in agriculture has given rise to a situation in which countries now have to cope with the problem of residues of these compounds in ground and surface water. 40-90% of surface water contamination is caused by direct losses (e.g. spills during filling operations, …
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Phytochemistry in the development of pesticides and biocides
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 …
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Fate of Current-use Pesticides in the Canadian Atmosphere
… and around the world, very large amounts of pesticides are produced and applied to agricultural crops each year. Although pesticide usage is declining, they are still a necessary part of industrial agriculture. Numerous pesticides have been quantified in the atmosphere, at high levels near …
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Sublethal Effects of Pesticides on Visually-Guided Bee Behaviours
… course during flight. The persistent use of pesticides in seed treatments and bees’ exposure negatively impact honeybee’s ability to engage in these ecologically relevant behaviours. Previous studies showed that neonicotinoids and sulfoxaflor impaired flight performance and walking tracks …
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Competitive Enzyme Immunoassay by Polyclonal Antibodies Against Organophosphorus Pesticides
… (OPs) comprise one of the major classes of pesticides in use today because they are highly effective and less toxic. Because of their extensive use, there is a need for monitoring OPs in water and vegetables. Gas chromatography (GC) is the usual method for OPs screening, but it is …
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Quelques réactifs inorganiques pour la détection fluorimétrique de pesticides
… inorganiques furent aussi examinés. Dix-sept pesticides furent détectés par fluorescence sur des couches minces et les conditions optimales de fluorescence furent établies; c'est-à-dire que la meilleure combinaison de réactifs, température, temps de chauffage et type d'adsorbant donnant la …
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Studies on the residue chemistry of some organophosphorus pesticides
… to specific studies on two organophosphorus pesticides, viz. Q, Q-diethyl -(K-ethosycarbonyl-8-methylcarbamoylmethyl) phosphorodithioate (common name mecarbam) and 0, G-diethyl S-chloromethyl phosphorodithioate (common name chlormephos). The preparation of a full range of possible metabolites …
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The Role of Pesticides in the Development of Childhood Leukemia
… had more types and frequency of exposure to pesticides than a matched control group of children that have not been diagnosed with leukemia. Parents of children with leukemia were asked to complete a telephone interview regarding their child's diagnosis and age at diagnosis, place and type of …
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Effects of the Chemical Pesticides DDT and Sevin on Rabbits
… study is to evaluate the effects of the chemical pesticides DDT (p, p'dichlorodiphenyltrichloroethane) and Sevin (1-naphthyl n-methyl-carbamate) on domestic rabbits.
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Rapid reductive dechlorination of environmentally hazardous aromatic compounds and pesticides
Organochlorine compounds, such as polychlorinated biphenyls (PCBs), pentachlorophenol (PCP), p,p'-DDE and Toxaphene, have been widely used in industry and agriculture for more than fifty years. Although they have served their purpose very effectively and at low cost, many of these compounds have …
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Ecological Magnification of Persistent Organochlorine Pesticides in an Illinois Watershed
… magnification of selected organochlorine pesticides in aquatic organisms of the Lake Decatur watershed in central Illinois were determined in this study. A review of the use of persistent organochlorine pesticides in the United States and the study area is provided. Samples of Pisces, …
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The removal of pesticides and heavy metals by reverse osmosis
In the past few years, the contamination by pesticides and heavy metals in surface water and groundwater has increased. Reverse osmosis is a unit process that has demonstrated capacity to remove dissolved pesticides and heavy metals from aqueous solution, and it is therefore worthwhile to consider …
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