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 97 for “"Microbial Community Structure"”.
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Microbial community structure and dynamics on patchy landscapes
… consequences remains a major challenge in microbial ecology. However, for the most part, studies employ coarsegrained sampling schemes, which average over the heterogeneous microscopic structure of microbial communities. This has limited our ability to establish mechanistic links between …
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Microbial community structure and nitrogen cycling in limestone biofilms
… analysis indicated that the general physical structure of the biofilm remained constant, but the organisms inhabiting the biofilm varied. Metagenomic analysis confirmed that taxonomic diversity in biofilm communities is dynamic and variable, but the predicted functional capacities appear to be …
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Insights into microbial community structure from pairwise interaction networks
Microbial communities are typically incredibly diverse, with many species contributing to the overall function of the community. The structure of these communities is the result of many complex biotic and abiotic factors. In this thesis, my colleagues and I employ a bottom-up approach to …
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Performance and microbial community structure of Midwestern groundwater pretreatment reactors
… of startup without any nutrient amendment or microbial inoculation. Terminal restriction fragment length polymorphism revealed temporal and depth-related changes in microbial community structure throughout the ripening period in parallel with performance data. This study demonstrates that …
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Resolving Drivers of Microbial Community Structure in The Dry Valleys of Antarctica
… the processes that underlie patterns of microbial distribution is fundamental to the field of microbial ecology, but extremely challenging given the complexity of natural systems. Antarctica’s ice-free regions possess unique ecosystems of simple trophic structure, shaped by the harsh …
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LAND USE LEGACY REGULATES MICROBIAL COMMUNITY STRUCTURE AND FUNCTION IN TRANSPLANTED CHERNOZEMS
… agricultural influences on soil nutrients and microbial dynamics is often complicated by the heterogeneity of soil environments as well as complex interactions between confounding factors of climate, topography and hydrology. A long-term soil transplant experiment located at the Agriculture and …
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Landscape history and contemporary environmental drivers of microbial community structure and function
Recent work in microbial ecology has focused on elucidating controls over biogeographic patterns and connecting microbial community composition to ecosystem function. My objective was to investigate the relative influences of landscape legacies and contemporary environmental factors on the …
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Soil microbial community structure and function along environmental gradients: implications for wetland nitrogen cycling
Item released from any restrictions by Sarah Shreeves (sshreeve@illinois.edu) on 2014-02-01T11:00:27Z
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The effects of hydrology and vegetation on microbial community structure and soil function in the sediments of freshwater wetlands
… the primary factors shaping wetland function and microbial community structure, but plant-soil interactions are also important mechanisms affecting microbial nutrient transformations. The research presented here considered the interactive effect to describe how hydrology and the presence of plants …
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An Evaluation of the Effects of Marine Oil-spills, Remediation Strategies, and Shipwrecks on Microbial Community Structure and Succession
… which quantifies the proportion of a bacterial community with hydrocarbon-biodegradation potential, revealed an extremely low score, highlighting a limited capacity for the environment, at the time of sampling, to naturally attenuate oil. Analysis of sediments contaminated by the Agia Zoni II …
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Molecular Characterization of Spinach (Spinacia Oleracea) Microbial Community Structure and its Interaction With Escherichia coli O157:H7 in Modified Atmosphere Conditions
… and population size of the spinach bacterial community. Decreases in the overall soil and ambient temperature and increased rainfall decreased richness and bacterial population size. Fresh spinach richness and composition assessed by parallel pyrosequencing of 16S rRNA elucidated 600 …
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Soil microbial community structure and function of agriculturally used Mollisols in the periurban area around Buenos Aires, Argentina, with emphasis on pesticide and heavy metal contamination
… land use systems lead to an alteration of soil microbial community structure and function. Additionally, it was investigated whether conventional cultivation leads to a soil quality deterioration and if a replacement by organic cultivation can improve this situation. With the aid of a field …
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Effects of Organic and Conventional Agricultural Practices on Soil Microbial Communities and Molecular Detection of Soil Borne Disease
<p>Agricultural practices affect soil microbial communities and health through the input of pesticides, herbicides, fertilizers, and cycling of crop rotation. By examining the microbial community structure, we analyzed how microbial species respond to the environment that individual farms create. …
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Evaluation of Chitin as an Electron Donor and Nutrient Source for Stimulating the in Situ Bioremediation of Chlorinated Solvents
… and raises interesting questions on microbial community structure and motility in groundwater systems.
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DEPTH AND TIME RELATED VARIATIONS OF MICROBIAL COMMUNIITES IN AN EMERGENT FRESHWATER WETLAND
Soils, and the microbial communities contained within them, are vital for most chemical, physical, and biological processes. This study investigated how microbial community structure responded to environmental changes, such as hydrology, across vertical space (depth) and time in an emergent fresh …
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Microbial Regulation of Soil Greenhouse Gas Emissions in a Non-Bloat Legume Grazing System
… dioxide (CO2), and nitrous oxide (N2O) from microbial respiration of soil carbon (C) and nitrogen (N). Producers may introduce non-bloat legumes to cattle pastures to improve soil N content, increase cattle protein uptake, and decrease enteric methane emissions. However, such land management …
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Regenerative agriculture and soil carbon storage in the Upper Corn Belt
… affects SOC storage, erosion processes, and microbial community structure. Factors such as topography, time since adoption of regenerative practices, climate, and soil texture significantly influenced SOC stocks and microbial community structure. Slope and historical erosion emerged as a key …
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Mechanistic insight into the role of dietary fibers and short chain fatty acids in the regulation of metabolism and inflammation in the pig
… and host metabolism via modulation of gut microbial community structure and production of short chain fatty acids (SCFA). A series of in vivo experiments were conducted to determine the effects of dietary fiber on pig growth performance and gut microbial community as well as host …
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Relating Biological Rate Measurements and Microbial Processes Across Diverse Ocean Ecosystems
… of such interactions between the marine microbial community and ocean biogeochemistry, oceanographers have yet to attain a deep understanding of the ecological mechanisms underlying these connections. Due to the vast scale of ocean ecosystems, however, large-scale yet high-resolution …
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