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.
Results
Showing 1 to 20 of 21 for “"biological controls"”.
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Physical, chemical and biological controls on the origin, crystallization and dissolution of human kidney stones
… deposits that undergo few physical, chemical and biological post-depositional changes (diagenesis) such as dissolution and recrystallization. Furthermore, with the exception of struvite mineralogy, stones are generally considered sterile and microbial influences on stone formation are nil. This is …
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Diagnosis of physical and biological controls on phytoplankton distribution in the Gulf of Maine-Georges Bank region
… the internal bio-chemical parameters affect the biological system. The second model investigates the effect of the circulation field on the distribution of phytoplankton, and the relative importance of physical circulation and biological sources by using a data assimilation approach. The model …
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Diagnosis of physical and biological controls on phytoplankton distribution in the Gulf of Maine-Georges Bank region
… the internal bio-chemical parameters affect the biological system. The second model investigates the effect of the circulation field on the distribution of phytoplankton, and the relative importance of physical circulation and biological sources by using a data assimilation approach. The model …
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The mineralogy and chemistry of modern shallow-water and deep-sea corals
… Different models based on geochemical versus biological controls over coral skeleton biomineralization propose conflicting predictions about the fate of corals under OA. Rather than investigating the mechanism directly, I use a mineralogical approach to study the aragonite end-products of …
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Chemical characterization of dissolved organic matter (DOM) in seawater : structure, cycling, and the role of biology
… compounds within the HMWDOM pool, and the biological controls on DOM release. The first section of this thesis provided additional molecular level characterization of HMWDOM. While some individual components have been identified, the total yield of compounds isolated is much smaller than …
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The controls of watershed nutrient export
… of N loading, hydraulic characteristics, and biological activity. The representation of biological activity strongly influenced predicted N removal of aquatic systems, pointing out the need to better understand biological controls in different regions of the world.</p><p>A great deal of …
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The biogeochemistry of marine nitrous oxide
… been used to characterize the biogeochemical controls on N2O production by marine nitrification as well as the natural abundance stable isotopic signatures of N2O produced by marine nitrifiers. This thesis shows that in addition to chemical controls on N2O production rates such as oxygen (O2) …
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Biological control agents of soybean insect pests in the Tidewater area of Virginia
The species of biological control agents which affect soybean pests in the Tidewater area were investigated, and their relative values were determined. Two pentatomids, <u>Podisus Macu1iventris</u> Say and <u>Stiretrus anchorago</u> F., were the only significant bio-contro1 agents which attacked …
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The biogeochemistry of marine nitrous oxide
… been used to characterize the biogeochemical controls on N₂O production by marine nitrification as well as the natural abundance stable isotopic signatures of N₂O produced by marine nitrifiers. This thesis shows that in addition to chemical controls on N₂O production rates such as oxygen (O₂) …
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Chemical characterization of dissolved organic matter (DOM) in seawater : structure, cycling, and the role of biology
… compounds within the HMWDOM pool, and the biological controls on DOM release. The first section of this thesis provided additional molecular level characterization of HMWDOM. While some individual components have been identified, the total yield of compounds isolated is much smaller than …
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The effects of temperature and moisture on alpine microbial processes across a gradient of soil development
… moisture and nutrient availability are primary controls of microbial abundance and activity, it is likely that microbial linkages exist between global change and ecosystem-level consequences of global change in alpine regions. Deglaciation in high-elevation regions incrementally exposes soils to …
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An Economic Evaluation of the Health and Environmental Benefits of the Integrated Pest Management Program (IPM CRSP) in the Philippines
… control strategies, and alternative cultural and biological controls. If successful, the program should generate benefits that can be measured in economic terms. These benefits include improvements in water quality, food safety, pesticide applicator safety, and long run sustainability of pest …
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Chemical and biological control of silvery threadmoss on creeping bentgrass putting greens
… threadmoss control on greens. Carfentrazone controls moss up to 75% applied at a three week interval throughout the growing season. Alternatives providing longer residual or more effective control are desirable. Studies were conducted to examine the growth of moss gametophytes from spores and …
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The mineralogy and chemistry of modern shallow-water and deep-sea corals
… Different models based on geochemical versus biological controls over coral skeleton biomineralization propose conflicting predictions about the fate of corals under OA. Rather than investigating the mechanism directly, I use a mineralogical approach to study the aragonite end-products of …
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Physical and Biological Drivers of Wetlandscape Biogeochemistry
… as a study ecosystem to explore physical and biological controls on wetland chemistry within forested wetlandscapes. The Delmarva wetlandscape consists of thousands of geographically isolated wetlands on the Delmarva Peninsula, United States, which despite their proximity to each other have …
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Herbivore resistance in inavasive and native Myriophyllum spicatum and Myriophyllum heterophyllum
… made to use augmented herbivore populations as a biological control of nuisance populations, however, the success of these efforts has been variable. One character which can affect the success of these biological controls is the expression of plant herbivore resistance. In this study I examined …
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Investigations on the role of the gut microbiota in hippocampal neuroplasticity and behaviour throughout the lifespan
… making it imperative to understand the biological controls of hippocampal neurogenesis. Hippocampal neuroplasticity is shaped by factors such as aging, diet, and psychological stress. However, the underlying mechanisms by which these factors influence neuroplasticity in the hippocampus …
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Climate proxies in planktic foraminifera: Environmental or biomineralisation controls?
… and individuals, indicating different degrees of biological control during calcification. This introduces significant uncertainties in their interpretation. To improve the reliability of foraminiferal proxies, it is crucial to understand the biomineralisation processes that govern the …
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