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 36 for “"Repellents"”.
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Managing deer: attractants, repellents, invasion modelling and impact assessment
… additional approaches, including attractants and repellents. These remain largely untested on deer in the British Isles, therefore this thesis aims to develop knowledge of the efficacy of each of these. In addition, with the continuing invasion of introduced deer species, predicting their impacts …
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Laboratory and Field Evaluation of Factors Affecting the Performance of Fly Repellents
Made available in DSpace on 2015-05-12T17:15:36Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 0005946.PDF: 2578576 bytes, checksum: 96fe8265f5b77ce4a3cfb3b634009301 (MD5) Previous issue date: 1953
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Efficacy of Organic Insecticides and Repellents against Brown Marmorated Stink Bug in Vegetables
The brown marmorated stink bug (BMSB), Halyomorpha halys (Stål), is a major pest of vegetable crops, fruit crops, and even ornamental plants in the Mid-Atlantic States. Organic growers have limited chemical options to manage this pest, and are in need of better management options. Several …
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Investigation of impregnants for low-cost buildings
… penetration. Impregnation of masonry with water repellents particularly with silicone impregnants is the most successful method of protection of masonry from capillary water absorption. This thesis investigates the various impregnants available for low-cost buildings and measures their …
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Chemical Manipulation of Honey Bee Behavior
… pesticide-treated crops. Historically, insect repellents (IRs) have been used to prevent the spread of deadly human diseases by arthropod vectors. However, it has been shown that bees can be repelled from pesticide-treated crops using DEET and bee pheromonal compounds. Here, I report the …
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Chemotactic Methylation in Bacillus Subtilis (Chemosensory, Adaptation)
… attractants and away from high concentrations of repellents. Methylation and demethylation of methyl-accepting chemotaxis proteins (MCPs) has been demonstrated to play a central role in this process. The goal of this work was to clarify the nature of the response of the Bacillus subtilis …
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A Computational Analysis of the Gradient Concentration Profile of DEET and the Mosquito Behavioral Response
… is a common active ingredient in most spatial repellents. DEET is also a volatile organic compound. DEET prevents mosquitoes from detecting and coming into contact with an human individual. Gas sensing technologies such as metal oxide semiconductor sensors can detect VOCs. The World Health …
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Balancing growth and repulsion: Slit proteolysis generates diverse signals in axon guidance
… called Slits. Slits were first identified as repellents of CNS axons at the midline, the medial separation of the left and right sides of the body. In the absence of Slits, all CNS axons collapse onto the midline. The repulsion conducted by Slits is essential to maintain separation of axons on …
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Structure-Function Analysis of Insect Olfactory Receptors
… that might be used as possible targets of future repellents to modulate the activity of insect OSNs. The discoveries described in this thesis will have an impact on the design of better and safer insect repellents and the control of insect-borne diseases.</p>
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Exploring Aethina tumida Biology and the Impacts of Environmental Factors to Generate Novel Management Strategies
… of A. tumida to several attractants and repellents was quantified on behavioral and physiological levels. An additional source of attractive volatiles is the A. tumida fungal symbiont Kodamaea ohmeri, which ferments larval waste and is present throughout the A. tumida lifecycle, both …
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Studies on CheA(B): Phosphorylation, methylation and behavioral control during chemotactic signal transduction in Bacillus subtilis
… mediates the effect of binding of attractants or repellents at the MCPs (receptors) by altering its rate of autophosphorylation and subsequent phosphorylation of CheY, to bring about behavioral change, and CheB, to bring about adaptation. CheA$\sb{\rm B}$ appears to play a similar central …
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The contribution of design in sustaining social activities in central urban squares within large cities: the case of Belo Horizonte
… spaces, atmospheres, views, anchors and repellents) that emerged from the present study as supportive of social activities in urban open spaces are applicable to the design of most gathering urban open spaces while robustness, richness and legibility are identified as key urban design …
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A proposed role for the Ca ion in the chemotactic response of Physarum polycephalum
… the membrane and a subsequent movement forward. Repellents would act in a reverse manner by causing Ca⁺⁺ entry. This hypothesis also allows for the existence of a Ca⁺⁺-accumulating organelle. This organelle might replace or act in concert with the proposed Ca⁺⁺ fluxes across the external …
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Factors influencing arbovirus transmission: vector competence and the effects of virus infection on repellent response, oxidative stress, and glutathione-S-transferase activity
… and PMD. Increasing concentrations of the repellents to ≥10% was able to increase percent protection (%p) against infected and uninfected mosquitoes. Lastly, we determined the effects of ZIKV and LACV infection on oxidative stress and glutathione-S-transferase (GST) activity in Aedes …
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Durability and waterproofing investigations of the building envelope
… emphasized the need for redundancy in water repellents for porous units and the significant leniency of ASTM C90. Lastly, masonry veneer anchor guidelines were discussed, and it was found that the prescriptive nature of the MSJC code does not provide adequate guidance on installation of …
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Use of Bioinformatics in the Analysis of Chemotaxis Proteins
… transduction systems. Levels of attractants and repellents are sensed in the surrounding environment by various chemoreceptors. The signal is passed to the excitation pathway via the transfer of a phosphoryl group from the receptor-associated histidine kinase CheA to the response regulator CheY. …
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Role of Flagellar Motility in Apple Blossom Invasion and Tactic Response to Various Plant Nectar Extracts by Erwinia Amylovora
… Benzoate and salicylate were used as repellents while malate and tartarate were used as attractants in field trials. None of these compounds applied to apple blossoms as 1 or 10 nM solutions provided consistent protection from fire blight infection at an inoculum concentration of …
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Using Pheromone Lures, Insecticide Netting, and a Novel Food-Grade Repellent to Develop BMSB IPM Strategies
… so we tested the exclusion efficacy of repellents on overwintering shelters and found an 8-fold reduction in BMSB that entered shelters treated with geranyl cyclopentanone (apritone). The use of BMSB pheromones paired with insecticide netting for attract-and-kill of BMSB, the development …
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Cells that Kill: The Chemosensory Cell Types of Aedes aegypti Mosquitoes
… including human odor, carbon dioxide, and insect repellents. Mosquitoes are human's deadliest predator, causing 700,000 deaths every year through the transmission of malaria parasites and arboviruses including dengue. My research has focused on the molecular underpinnings of mosquito chemosensory …
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