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 40 for “"Pyrethroids."”.
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Identification and Screening of Biomarkers of Human Exposure to Environmental and Food Toxicants in Sewage
… exposure to organophosphates, triazines and pyrethroids. A specific analytical method based on liquid chromatography tandem mass spectrometry was developed and validated to measure human urinary metabolites of pesticides in influent wastewater. This method was applied to samples collected …
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STUDIES ON INSECTICIDE RESISTANCE IN TUTA ABSOLUTA (MEYRICK), WITH SPECIAL EMPHASIS ON CHARACTERISATION OF TWO TARGET SITE MECHANISMS
… in susceptibilities to organophosphates and pyrethroids, which are a major class of neurotoxic insecticides and acaricides used extensively over the last decades. One important mechanism of resistance to pyrethroids, termed knockdown resistance (kdr), has been shown to arise through …
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The science behind Tenax extractable concentrations and their use in evaluating environmental risk
… specifically acutely toxic compounds, such as pyrethroids, during environmental sampling and risk assessments of aquatic sediments. However, the use of this method is limited within the scientific literature and absent from most risk assessment protocols. The reasons for its limited use are …
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ΣΧΕΔΙΑΣΜΟΣ ΚΑΙ ΣΥΝΘΕΣΗ ΝΕΩΝ ΠΥΡΕΘΡΟΕΙΔΩΝ
… THE MODEL PROPOSED, THE FOLLOWING TWO GROUPS OF PYRETHROIDS WERE PLANNED AND PREPARED: 1) CHRYSANTHEMUM MONOCARBOXYLIC ACID ESTERS WITH A- SUBSTITUTED PIPERONYL ALCOHOLS, WHICH WERE PREPARED BY THE REACTION OF THE SUITABLE GRIGNARD REAGENTS (CH3(R)C=CHCH2CH2MGBR,R:ME, ET,N-R,PH) WITH PIPERONAL. …
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Oviposition and dispersal responses of the two spotted spider mite Tetranychus urticae Koch (Acari: Tetranychidae) to fenvalerate and permethrin residues in soybeans Glycine max (L) Merrill
… fenvalerate and permethrin. In all instances the pyrethroids were found to reduce the number of eggs oviposited. Mites recovered after several days, and oviposition returned to normal. The results did not lend support to the hormoligosis hypothesis of insecticide induced mite outbreaks. Field and …
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Molecular, Biochemical, and Toxicological Evaluation of Anticholinesterases for control of the Malaria Mosquito, Anopheles gambiae
Pyrethroids are the only class of insecticides approved by the World Health Organization (WHO) for use in insecticide treated nets (ITNs), the first line of malaria vector control. Widespread resistance development to pyrethroids undermines current control efforts, and hence an urgent need for …
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What is the best chemical approach to estimate the bioavailability of pyrethroid insecticides to benthic invertebrates?
… and Tenax to predict the bioavailability of two pyrethroids (permethrin and bifenthrin) (Chapter 3); Developing bioavailability-based toxicity endpoints for bifenthrin using two aquatic species (Chapter 4); and, Validating these techniques using sediments from known contaminated field sites …
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Insecticide detoxification in the navel orangeworm Amyelois transitella (Lepidoptera: Pyralidae)
… butoxide synergized the toxicity of the pyrethroids β-cyfluthrin and bifenthrin, which suggests that P450s are involved in detoxification of pyrethroid insecticides. Only azinphos-methyl was a substrate for GSTs in A. transitella, as evidenced by diethyl maleate synergism assays. Neither …
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Dynamics of La Crosse virus: Surveillance, Control and Effect on Vector Behavior
… assays were used to evaluate the efficacy of two pyrethroids and two essential oil sprays on LACV infected and uninfected mosquitoes. LACV-infected Ae. triseriatus females were more susceptible to both pyrethroids than uninfected ones. Infection status did not affect the susceptibility of Ae. …
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Species survey, monitoring and management of economically important stink bug species in eastern Virginia
… hilare adults and nymphs were susceptible to all pyrethroids tested. Generally, the neonicotinoids, dinotefuran and clothianidin, were more toxic to A. hilare, while thiamethoxam and acetamiprid were more toxic to E. servus. In soybean field efficacy trials, dinotefuran performed comparably to the …
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Quantifying the presence of current-use insecticides and toxicity of sediments in urban residential watersheds in central Texas.
… with MS/MS for the presence of several pyrethroids and other common insecticides. Ten-day sediment toxicity tests using H. azteca were also conducted with the sediment samples. Results of this study suggest that pyrethroid insecticide contamination of urban sediments may indeed be a …
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Characterization of the Increased Risk of Attention Deficit Hyperactivity Disorder Following Early-Life Exposure to Deltamethrin
… has been identified as one such risk factor. Pyrethroids, a popular class of insecticides, have been directly correlated with an increased risk in Attention Deficit Hyperactivity Disorder (ADHD). The focus of this thesis is to elucidate the mechanism through which the pyrethroid deltamethrin …
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Antibiotic resistant and xenobiotic degrading bacteria that shape the microbiota of the vectors Aedes aegypti & Culicoides sonorensis
… the use of insecticides such as synthetic pyrethroids like permethrin; however, the development of insecticide resistance has rendered this measure insufficient to control the spread of vectors and their diseases. The new age approach to vector control, microbiota manipulation, has shown …
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Exploiting muscarinic acetylcholine receptors as an insecticidal target to enhance the toxicity of gamma-amino butyric acid channel blockers and the continued challenges with resistance
… (CNS) responds to muscarinic compounds, type I pyrethroids, and acetylcholinesterase (AChE) inhibitors. In the case of acetylcholinesterase, the resistant insect increases the expression of Ace gene encoding this enzyme. Fully understanding how the CNS responds to receptor modifications is not …
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Evaluation of Multiple Insecticidal Products for Control of the Common Bed Bug (Cimex lectularius (L.))
… None of the insecticides tested, including the pyrethroids, were repellent to laboratory or field strain bed bugs. A field test was conducted comparing 2 pesticide treatments regimens (traditional and novel) for bed bug control in low income apartments. Both the traditional and novel …
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Evaluation of Economic Injury Levels and Chemical Control Recommendations for Rice Stink Bug (Oebalus Pugnax) in Louisiana
… Growers in Texas averaged more applications of pyrethroids than respondents in Arkansas and Louisiana. Seed treatments to combat rice water weevils have been adopted rapidly in all states surveyed.
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The cabbage whitefly, aleyrodes Proletella: causes of outbreaks and potential solutions
… method was developed. Resistance to several pyrethroids was found in multiple populations in Lincolnshire and Kent, with similar patterns between compounds but differing magnitudes of resistance. This resistance was expressed to a similar degree by both adults and nymphs. The host plant used …
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Identifying mechanisms of pyrethroid resistance in the navel orangeworm and novel methods of control
… sodium channel and confers resistance to pyrethroids. This mutation was identified in three separate populations from the San Joaquin Valley of California, two of which came from areas without any previously described pyrethroid resistance. Although the sweep was present in the reference …
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Toxicity and toxicokinetics of fenvalerate in fish
… susceptibility of this species to the synthetic pyrethroids.</p>
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Phenology and Management of Annual Bluegrass Weevil on Virginia Golf Courses
… climate. Reported cases of ABW resistance to pyrethroids (IRAC Group 3) continues to grow in the northeast, yet no pyrethroid-resistance cases have been reported in Virginia outside of the metropolitan Washington, D.C. For this thesis, I confirmed the widespread distribution of ABW across …
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