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 18 of 18 for “"Chemical controls"”.
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Chemical controls on tetrahedral site occupancy in amphiboles
Thesis (M.S.)--Michigan State University. Dept. of Geology, 1971
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Chemical Controls on the Formation of Amorphous and Crystalline Calcium Phosphates
… brushite shortly after reagent mixing, without chemical stabilization. This method was used in the second project to examine how the initial Ca/P affects ACP structure and transformation. Our results identify the first structural differences in types of ACP, controlled by the initial Ca/P. At …
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Chemical controls on the cycling and reactivity of marine dissolved organic matter
… black box, models of DOM reactivity use chemical characteristics, as well as environmental parameters, to describe trends in the turnover time of classes of DOM. In this thesis, I describe two projects that examine hypotheses regarding the turnover of two classes of DOM. In the 1st …
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Chemical Controls on the Cycling and Reactivity of Marine Dissolved Organic Matter
… black box, models of DOM reactivity use chemical characteristics, as well as environmental parameters, to describe trends in the turnover time of classes of DOM. In this thesis, I describe two projects that examine hypotheses regarding the turnover of two classes of DOM. In the 1st …
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Physical and Chemical Controls on Suffosion Development in Gypsic Soil, Culberson County, Texas
… of gypsic soils were delineated through geochemical analyses, further expanding upon the soil descriptions published in the Culberson County Soil Survey (USDA, 2013). Suffosion modeling replicated processes observed in the field through repeated infiltration of Dellahunt and Elcor soils—soil …
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Physical and chemical controls on carbonate precipitation in surficial hot springs and subterranean cold springs
… Cave, IL, are compared to determine physical and chemical parameters controls on carbonate precipitation. Macroscale (> 0.5mm) morphology and depositional patterns of carbonate precipitation in these hot and cold springs are independent of water temperature and calcite saturation states. …
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The Effect of Foliar and Root Pathogens of Soybean on Selected Host Parameters
… of soybean health, but when used together these chemical controls resulted in consistent increases in plant vigor, photosynthetic mass, and yield. Fumigation followed by inoculation of soil with Phytophthora megasperma var. sojae (PMS) provided a method to evaluate the effect of PMS infection, …
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The biogeochemistry of marine nitrous oxide
… methods have 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 …
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The biogeochemistry of marine nitrous oxide
… methods have 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 …
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Understanding Plant Pathosystems in Wild Relatives of Cultivated Crop Plants
… defeating current resistance genes (R genes) but chemical controls as well. Phytophthora sojae (P. sojae), the causal agent of Phytophthora root and stem rot disease, reduces soybean harvests worldwide. We developed an approach to screen for new R genes that recognize core effectors from P. sojae. …
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Novel Approaches for Anthelmintic and Nematicide Discovery
… on the use of anthelmintic medicines and agrochemical nematicides to control these devastating parasitic nematode infections. The development of genetic resistance to anthelmintics and the phase-out of effective nematicides due to environmental toxicity and human safety concerns necessitates …
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Illuminating controls on solute and water transport in the critical zone
… Thus, there is a need to better evaluate controls on pollutant partitioning in Earth's critical zone. Our first study investigated the transport and distribution of the neonicotinoid insecticide thiamethoxam (TMX) by growing TMX-coated corn seeds in coarse vs fine-textured soil columns …
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The geochemistry of boron and lithium in mid -ocean ridge hydrothermal vent fluids
… in order to better constrain the physical and chemical controls on these elements.</p><p>The results for B suggest that water-rock reaction and phase separation are important controls on the B content of hydrothermal fluids. Boron concentrations vary over a relatively narrow range (∼0.7 to …
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Spotted-wing Drosophila: Investigating the Efficacy of Innovative and Alternative Management Techniques
… particularly difficult for growers due to fewer chemical options and increased cost compared to conventional products. Since the arrival of SWD and the subsequent increase of insecticidal sprays, it has been a significant challenge for producers to balance economics as well as pest and pollinator …
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Trace Element Cycling during Iron(II)-activated Recrystallization of Iron(III) Oxide Minerals
Biogeochemical iron cycling initiates secondary abiotic reactions between aqueous Fe(II) and Fe(III) oxide minerals, which results in dynamic recrystallization via simultaneous Fe(II) oxidative adsorption and Fe(III) reductive dissolution. Fe(III) oxide minerals are abundant in soils, sediments, …
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Impacts of organic and conventional neurotoxic pesticides on a pest and a pollinator in almond agroecosystems (Prunus dulcis)
… resulting in the development and usage of novel chemical controls, such as spinosyns, derived from natural products, in contrast with conventional pesticides, such as neonicotinoids, synthesized based on natural products. Both spinosyn and neonicotinoid insecticides act on binding sites of the …
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Predicting induced sediment oxygen flux in oxygenated lakes and reservoirs
… the current understanding of physical and chemical controls on JO2, methods for predicting oxygenation-induced JO2 are still based on empirical correlations and factors of safety. As hypolimnetic oxygenation becomes more widely used as a lake management tool for improving and maintaining …
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Insights into the seasonal ecology and thermal biology of the lesser grain borer, Rhyzopertha dominica (Coleoptera: Bostrichidae)
… and promoting fungal growth. Its resilience to chemical controls and behavior of developing within grain kernels make traditional management challenging, prompting interest in alternative strategies such as cold-based interventions, including ambient and chilled aeration. Yet, the effectiveness …