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 478 for “"microbial community"”.
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Microbial community analysis for denitrifying biofilters
… was limited. Therefore, in this study, the microbial community of the biofilter was described using several different techniques. Denitrifying enzyme assays with inhibition showed that denitrification is primarily mediated by bacterial populations, but that fungi are also indirectly …
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Bacterial Interspecies Interactions and Microbial Community Assembly
Microbial communities play central roles in the development and maintenance of human health and in the functioning of the Earth’s ecosystems. The microbial biodiversity of many environments has been thoroughly studied in recent years, yet the dominant processes shaping microbiota assembly remain …
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Soil microbial community dynamics associated with agricultural crops
… that occur between agricultural crops and microbial communities that reside in the soil. Soil microbes regulate the decomposition of organic matter, the cycling of nutrients to crops and can induce systemic resistance. They also drive global biogeochemical cycles that influence the climate, …
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Soil Microbial Community Dynamics In Florida Scrub Ecosystem
… short- and long-term fire effects on the soil microbial community. Fire effects were studied in a chronosequence, comprising a recently burned scrub during a winter-prescribed fire to scrub where fire did not occur for 40 years. The number of culturable cells was reduced by two orders of …
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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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Phylometagenomics: a new framework for uncovering microbial community diversity
Microbial communities are recognized as major drivers of global biogeochemical processes. However, the genetic diversity and composition, as well as processes leading to the origin and diversification of these communities in space and time, are poorly understood. Character- ization of microbial …
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Microbial community structure and nitrogen cycling in limestone biofilms
… one quarter of the variation in the taxonomic community data is explained by climate variables, indicating that a combination of stochastic and deterministic factors may drive community assembly. Limestone biofilm communities may be colonized from guilds of organisms that assemble based on the …
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Microbial community dynamics in denitrifying biofilters receiving agricultural drainage
… environmental and management factors affect the microbial communities responsible for biofilter functional. To do so, we employed two different approaches. First, in our spatial study we sampled one biofilter over the course of an afternoon in 2007 to determine how total and denitrifying …
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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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Patterns of microbial community development in isolated aquatic systems
… of this research was to compare the process of microbial community development in isolated aquatic systems to the MacArthur-Wilson equilibrium theory of island biogeography and suggest alternative models for the observed patterns. Water-filled plastic containers were used as aquatic islands to …
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Microbial community responses of an anaerobic enrichment to temperature shocks
… and failure, perhaps through disruption of microbial cooperation. Nevertheless, understanding of how AD microbiota respond to temperature shock is poor. Specifically, we have yet to identify organisms vulnerable to heat shock or responsible for recovering post-shock AD activity. 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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Omics-driven and constraint-based modelling of microbial community metabolism
As microbial ecology research has benefited from advancements in omics technologies, the increasing complexity and volume of generated data has in turn stimulated developments in computational biology approaches for analysis and interpretation. This is where my research lies: at the intersection of …
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Evaluation of Nitrogenase Genes as Markers in Soil Microbial Community Studies
Molecular tools were developed to overcome some of the constraints to analyzing nitrogen-fixing bacteria in the environment. Two distinct plant-microbe systems were used to develop these tools, and to evaluate their utility and flexibility. The first system focused on nitrogen-fixing bacteria in …
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Soil Microbial Community Response to Human Decomposition in Michigan's Upper Peninsula
… conditions, with predictable patterns in microbial succession offering potential for postmortem interval (PMI) estimation. This study examines the soil microbiome associated with human decomposition at the Forensic Research Outdoor Station (FROST) in Marquette, Michigan – a unique …
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Interactions between cover crop residue and microbial community affect weed suppression
… weed germination, growth and production. Soil microbial communities are especially important for the allelochemical potential of a cover crop residue, because microorganisms can modify residues and allelochemicals to make them more or less phytotoxic. In addition to their effects on …
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Automated Plant Morphological Assessment and Microbial Community Monitoring in Simulated Lunar Regolith
… on Mizuna mustard growth while assessing microbial community diversity and functionality. To support this effort, a custom software pipeline utilizing an open-source library, PlantCV, was developed to automatically track plant leaf area and height via image analysis. Results indicated that …
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Unraveling key drivers of microbial community assembly and impacts on microbial function
To view the abstract, please see the full text of the document.
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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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