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 83 for “"environmental microbiology"”.
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Prevalence, persistence and consequences of microorganisms within oil field environments and mitigation strategies
… drilling, have increased access to samples for environmental microbiology, enabling microorganisms inhabiting those ecosystems to be studied. It is now better understood that microorganisms must withstand extreme conditions (high temperatures, high salinities, high pressures and the presence of …
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Fluorescence correlation spectroscopy: ultrasensitive detection in clear and turbid media
… and characterization of microorganisms in environmental microbiology and the food industry, and to the fast and ultrasensitive detection of protein aggregates for the diagnosis of Alzheimer’s and other neurodegenerative diseases in clinical medicine. A prototype instrument has been built …
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The Role of Multidrug Efflux Pumps in the Stress Response of Pseudomonas aeruginosa to Organic Contamination
… <i>Pseudomonas aeruginosa</i>, to a common environmental pollutant, pentachlorophenol (PCP). In the first part of the research, it was revealed that nutrient-limited <i>P. aeruginosa</i> is able to respond to PCP with minimal physiological damage due to the upregulation of multidrug efflux …
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Impacts of trace metal pollution, urbanization and aquifer recharge on Spokane River macroinvertebrates
<p>This study analyzed macroinvertebrate communities of the Spokane River to determine: 1) accumulation of toxic trace metals in macroinvertebrate tissue, 2) effects of aquifer recharge, and 3) impact of urbanization. I predicted that aquifer inflows of cold, clean water would mitigate effects of …
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Monitoring the influx of marine derived Nitrogen and characterizing soil food webs of riparian zones of the Elwha River Watershed, WA, USA.
<p>Nitrogen is often the most limiting nutrient to productivity in terrestrial ecosystems, and can have large effects on ecosystem processes. Two sources of nitrogen to Pacific Northwest riparian areas are marine derived nitrogen (MDN) via anadromous pacific salmon and symbiotic nitrogen fixation …
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The effects of warming on carbon and microbial community wetland dynamics at Turnbull National Wildlife Refuge, Washington
<p>Wetlands are biodiverse ecosystems that play a key role in the biogeochemical cycling of carbon. In the face of global warming, wetland hydroperiods could shift causing changes in their functionality. My field experiment surveyed 3 plots within 12 wetlands of each hydroperiod class (i.e. 12 …
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Fate and Transport of E. coli Through Appalachian Karst Systems
Karst waters serve as important water sources in rural Appalachia and are well-connected to surface waters, making them susceptible to anthropogenic contamination, including by fecal indicator bacteria which represent a public health risk. This work designed and implemented a watershed-scale …
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Remnant assessment and soil inoculation to inform large-scale prairie restoration at Eastern Washington University
<p>The Palouse Prairie of Eastern Washington and Western Idaho, characterized by rolling hills of deep loess soil, is one of the most endangered ecosystems in the world, with more than 99% converted to tilled farmland. To mitigate this loss, Eastern Washington University has begun prairie …
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Bacterially-Mediated Formation of Rock Coatings in Kärkevagge, Swedish Lapland: A Mineralogical and Micro-Environmental Analog for Mars
… on Mars.</p> <p>To examine the role of microbiology in these terrestrial rock coatings and what the biotic formation of coatings might tell us about observed coatings on Mars, we asked three basic questions: 1) What microbes inhabit the coatings, 2) What are those microbes contributing …
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Epiphytic Diatom Community Structure in a Karst Riverine System
<p>The goal of this study was to assess the epiphytic diatom community structure of two host species along a karst gradient in the upper Green River, Kentucky to a gain a better understanding of the role of diatoms in the food web. The host species studied were Podostemum ceratophyllum and …
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Escherichia coli Strain Diversity in Humans: Effects of Sampling Effort and Methodology
<p>Studies investigating <em>Escherichia coli</em> strain diversity and demographics in human hosts are frequently inconsistent regarding sampling effort and methodology while current strain typing methods are often expensive or laborious. To rectify these inconsistencies, sampling effort was …
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How Historic Shipwrecks Influence Dispersal of Deep-Sea Microbiomes
<p>This thesis investigates how historic shipwrecks potentially shape dispersal of deep-sea microbiomes. Processes impacting dispersal of microbiomes around artificial structures in the ocean and how they connect to other deep-sea habitats is unknown. Dispersal processes are explained for some …
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EFFECT OF MYCORRHIZAE INOCULATION ON THE GROWTH AND SUCCESS OF THREE TAXODIUM DISTICHUM HYBRIDS IN SALINE - IMPACTED COASTAL SOILS
<p>In 2008, Galveston Island was severely impacted by Hurricane Ike, resulting in high salt deposition in the soil and groundwater. This caused a loss of many native plant species. A study was initiated to determine effective ways to promote the growth conditions of three bald cypress genotypes …
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Demographics and Transfer of Escherichia coli Within Bos taurus Populations
<p>In the United States, symptoms caused by pathogenic strains of <em>Escherichia coli</em> are on the rise. A major source of these pathogenic strains is the <em>E. coli</em> in the digestive tract of cattle. The purpose of this project was to determine if <em>E. coli</em> are transferred between …
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Microbial monitoring and degradation of lindane in soil
… the production of lindane, also pose a major environmental threat. Because of the widespread pollution by lindane (and other HCH-isomers), there is a need for risk assessment tools to monitor its environmental impact. Monitoring of polluted sites is as yet often restricted to the …
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Shifts in Myxomycete Community Structure in Selected Microhabitats Across Nutrient Treatments in a Lowland Tropical Forest of Panama
<p>Myxomycetes (plasmodial slime molds) are abundant amoeboid predators of bacteria and other microorganisms. They are found worldwide, largely in association with decaying plant material in terrestrial habitats. Their consumption of bacterial prey puts microbial predators such as myxomycetes in a …
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