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 30 for “"microbial abundance"”.
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Assessing the Effect of “Time of Birth” on Nasopharyngeal Microbial Load in Infants
… the effect of “month of birth” (MOB) on the microbial load of the most abundant otopathogen, Moraxella Catarrhalis. This is a retrospective analysis of data collected between 2009 – 2014 as part of a longitudinal study to determine risk factors for AOM. Subjects were recruited near birth and …
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Benthic mineralization and microscale heterogeneity
… functioning including: trace metal mobilization, microbial abundance/activity and localized increased concentrations of electron donors. The combined findings highlight the need for high spatial resolution to achieve a full conceptual and quantitative understanding of benthic microbial systems. …
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Analysis of Bacterial Abundance and Species Diversity in Various Soils
… types display a wide range of nutrient content, microbial abundance and diversity. Many of the microbes viable in soil have practical functions in the agricultural and medical fields while others are pathogenic. Garden topsoil, potting soil, forest soil, compost and manure were the five soil …
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Microbiome and Metagenomics: Statistical Methods, Computation and Applications
Human microbial communities are associated with many human diseases such as obesity, diabetes and inflammatory bowel disease. High-throughput sequencing technology has been widely used to profile the microbial communities in order to understand their impact on human health. In the first part of …
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Understanding the microbiota in drinking water distribution networks – from municipal to indoor water supply systems
… structure, and spatio-temporal variation of microbial communities in the municipal distribution system and indoor plumbing. The Champaign-Urbana water distribution system, which received conventionally treated and disinfected groundwater, was used as a model system. High throughput sequencing …
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Relationships Among Soil Properties and Soil CO2 Efflux in a Loblolly Pine-Switchgrass Intercropped System
… soil properties including temperature, moisture, microbial abundance and activity, and other soil physical and chemical properties. Changes in these factors can result in high spatial and temporal variability of total soil CO2 efflux. Low molecular weight organic acids (LMWOAs), dissolved organic …
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Locational and temporal patterns in microorganisms potentially affecting water quality in the Dan River system
… TandO problems, and to characterize changes in microbial community structure. Although no significant TandO event occurred during the study period, the work produced unique and valuable data that describe patterns of microbial populations and communities in a river ecosystem. Results from the …
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Global meta-analysis and metagenomics approach on the soil microbiome associated with cover cropping
… baseline effect size of cover cropping on soil microbial abundance, activity, and diversity, ii) identify environmental and agricultural factors that affect the cover crop effects sizes on the soil microbiome, iii) further understand the cover crop effects on the soil microbial diversity by …
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Microbial characterisation of bioaerosols from indoor environments using molecular techniques.
… health, relatively little is known about the microbial agents in indoor air and there are still critical gaps in our understanding of the airborne microbial communities. Molecular biology methods demonstrate a great potential for improving our comprehension of the significance of the indoor …
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The effects of temperature and moisture on alpine microbial processes across a gradient of soil development
… introducing bioavailable nutrients. Because microbial communities are important drivers of nutrient cycling and ecosystem function in the alpine, and because temperature, moisture and nutrient availability are primary controls of microbial abundance and activity, it is likely that microbial …
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Geochemical changes, plant growth and ecosystem recovery in soils after high temperature remediation
… its ability to support plant growth and microbial activity. This thesis demonstrates the effects of such heating on soil properties, the impact on plant and microbial systems, and potential methods for rehabilitating soils to improve plant growth after remediation. Soils subjected to …
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The effects of warming on carbon and microbial community wetland dynamics at Turnbull National Wildlife Refuge, Washington
… I report on differences in both wetland soil microbial abundance and diversity between treatments. Total abundance was measured by qPCR to quantify 16S rRNA gene copy numbers. Soil microbial diversity, composition, and relative abundance was determined using Illumina sequencing protocol for …
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Characterization of microbial primary and secondary metabolism in the marine realm
… of BGCs in free-living and particle-associated microbial communities along the oxycline water column of the Cariaco Basin, Venezuela, revealed that differences in water column redox potential were associated with microbial lifestyle and the predicted composition and production of secondary …
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Long Range Transport of Microorganisms in the Upper Atmosphere
… arrive from distant, transpacific sources. Microbial abundance and richness values were derived from qPCR measurements and 16S rRNA microarray analysis. Thousands of distinct bacterial taxa (and 6 archaeal species) were detected in Asian air samples, spanning a wide range of phyla and …
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UNDERSTANDING DIFFERENTIAL ABUNDANCE IN MICROBIAL ECOLOGY USING COMMUNITY STRUCTURE.
… science, agriculture, and medicine. Differential abundance analysis (DAA) is one of the central statistical methods for identifying microbial features that are associated with macroscopic states. Differentially abundant microbial features can broaden the understanding of disease mechanisms and …
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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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Natural and Anthropogenic Drivers of Variation in Bumble Bee Gut Microbiotas
… colony life cycle. I found that during diapause microbial abundance fell by an order of magnitude and gut microbial communities underwent dramatic restructuring, with some core phylotypes becoming undetectable past diapause onset. Finally, in Chapter 5 I examined how bumble bee gut microbiota …
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Characterization of Microbial Primary and Secondary Metabolism in the Marine Realm
… of BGCs in free-living and particle-associated microbial communities along the oxycline water column of the Cariaco Basin, Venezuela, revealed that differences in water column redox potential were associated with microbial lifestyle and the predicted composition and production of secondary …
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Buried Surface Horizons in Saskatchewan Croplands Provide Insight into Microbial Soil Carbon Cycling and Development of Persistent Organic Matter
… serves as the primary C for the buried native microbial community. The goal of this thesis was to quantify and characterize the soil organic C (SOC) and examine microbial decomposition of this C in buried surface horizons, decades after burial. Surface (Ah) soils were sampled at 0-10 cm, buried …
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The spatiotemporal dynamics of bacterial and fungal abundance in Great Plains non-perennial streams
… Surface flow connectivity to the local microbial habitat provides organic energy and dissolved nutrients that support microbial growth, and in turn, nutrient immobilization. However, the sensitivity of microbial populations to stream drying and rewetting is not well understood. Thus, …
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