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 44 for “"Bacterial Community Structure"”.
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The Effects of Temperatures on System Performance and Bacterial Community Structure in a Biological Phosphorus Removal System
… acclimated to 20°C had a much more diverse bacterial population than the biomass acclimated to 5°C. However, no GAO population was detected in electron microscopy samples under any temperature conditions. The decreased P removal efficiency at 20°C was then attributed to the presence of …
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Experimental litterfall manipulation effects on soil bacterial community structure and soil carbon cycling in a wet tropical forest
… detrital C inputs on belowground microbial community function, C cycling and fluxes remain largely unknown, especially in tropical forest ecosystems. To investigate how shifts in bacterial community composition resulting from differences in C availability affect organic matter decomposition …
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Experimental litterfall manipulation effects on soil bacterial community structure and soil carbon cycling in a wet tropical forest
… detrital C inputs on belowground microbial community function, C cycling and fluxes remain largely unknown, especially in tropical forest ecosystems. To investigate how shifts in bacterial community composition resulting from differences in C availability affect organic matter decomposition …
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Influence of vegetation on sediment bacterial community structure, microbial enzyme activities and phosphorus retention in constructed freshwater wetlands
… focuses on the influence of vegetation on bacterial community structure, microbial enzyme activities, and phosphorus retention capacity of constructed wetland systems. A greenhouse experiment was conducted using unvegetated or vegetated mesocosms with Juncus effusus, Carex lurida or …
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The Influence of Land Coverage and Soil Chemical Factors on Soil Bacterial Community Diversity and Structure in Cedartown, GA, USA
… metal stress, but the response of different bacterial groups may vary depending on the level and type of heavy metal contamination. When subjected to heavy metal stress, many bacterial species or populations may become extirpated, while some may survive to form the foundations of a new …
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Influence of plant species, location, and seasonality on rhizosphere bacterial communities in freshwater wetlands
… complexity of factors influencing soil microbial community structure, a greater knowledge of the relationship between rhizosphere microbial communities and different types of plant species will lead to a deeper understanding of plant-microbe interactions in wetlands. Thus, the purpose of my …
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Soil bacterial structure and function associated with the invasive grass Microsteguim vimineum and two native grasses
… soil health. An invasive plant that alters the structure and function of the soil microbial assemblage could gain an advantage over native plants, enhancing its ability to invade new habitats, alter ecosystem function, and hinder efforts to reestablish native populations. Assays of enzyme …
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Change in the Structure of Soil Microbial Communities in Response to Waste Amendments
… to primarily assess if there is a change in bacterial community structure in response to poultry litter amendments to pasture land across geographically independent land across northern Georgia. It may be that changes in the relative abundance of bacterial communities also result in …
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A multi-disciplinary approach to the characterization of waterlogged burial environments : assessing the potential for the in situ preservation of organic archaeological remains
… of the composition and activity of the microbial community.Soil cores were taken from two wetland sites located in the Humberhead Levels in Yorkshire: Hatfield Moor and Sutton Common. Cores were subsampled at depth intervals down to 100 cm depth, to allow for the examination of the vertical …
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Effects of nutrition on honey bee microbiology, disease occurrence, and hive growth
… how nutritional supplementation impacts gut bacterial community structure and function, disease occurrence, and overall colony health. The supplementation was mixed in 1:1 sugar-water and mimicked nectar and pollen, consisting of protein, vitamins, and minerals. Control hives were fed 1:1 …
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Detection of an Introduced Bacterial Culture in Greywater Treatment Reactors
This research describes overall bacterial community structure within a greywater wastewater treatment reactor, and identifies one specific bacterial inoculum. Biological samples were removed from both the unattached (planktonic) and surface-adherent (biofilm) populations in several inoculated …
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The effect of environmental factors on the dynamics of bacterial populations associated with coral colonies and the implications for holobiont health
The coral holobiont is comprised of a diverse community of microbial partners, including bacteria living within microhabitats, such as the coral tissue’s and surface mucus layer (SML). However, little is known about the interactions between the bacterial communities in the various compartments of …
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Profiling Bacterial Community Dynamics For Wildlife Ecology and Geological Mineral Exploration
Bacterial communities are dynamic biological systems with complex metabolic interactions that influence ecological functions across a broad range of microbiome environments. Bacterial community 16S rRNA gene amplicon sequencing is an approach to microbiome exploration that profiles community …
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Isoprene Degradation in the Terrestrial Environment
… incorporate isoprene into its DNA. Changes in bacterial community structure analysis through isoprene enrichment suggested a replicable isoprene-degrading community. An extensive collection of isoprene-degrading isolates was created. Isoprene-degrading genes were investigated at the amplicon …
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Effect of tree mortality on biogeochemical response after mountain pine beetle forest infestation, The
… tree mortality also affected the soil bacterial community structure with associated increases in alpha diversity and overall community structure. However, functional processes tended to correlate better with changes in C:N ratio. Collectively, these biogeochemical and microbial …
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The wheat seed phytomicrobiome as a potential source of resistance to the fungal disease, Fusarium head blight
… used field trials to characterize the seed head bacterial community (16S rRNA gene amplicons) across planting locations, host resistance genotypes, varieties, and plant development stages. We identified bacterial amplicon sequence variants (ASVs) present in each sample and then examined ASV …
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Field and laboratory evaluation of the interactions between pesticides and the gut microbiome in Honey Bees (Apis mellifera)
… factors like pesticides impact their gut bacterial symbionts. I hypothesized that 1) pesticide concentrations in bees are correlated with gut bacterial community structure, and 2) strain variation in growth response to pesticides exists within and among bacterial taxa. In this two-part …
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Soil physical impacts and recovery rates following human-induced disturbances in the Ross Sea region of Antarctica
… disturbance trial was set up near Scott Base and bacterial DNA profiling was used to investigate the response of communities to removal of the top 2 cm of soil. Infra-red track counters were installed on Ross Island walking tracks to record visitor use over a two-year period. Five case studies, …
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Biochemical Composition of Caribbean Gorgonian Corals and Their Symbiosis Under Ambeint and Stressful Conditions
… predict how climate change will affect the reef community, it is essential to understand gorgonian physiology under ambient and stressful situations. Under ambient conditions, eight gorgonian species hosted different clade B Symbiodinium, and in two gorgonian species in which the bacterial …
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