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 193 for “"Bacterial Communities"”.
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The influence of mucins on bacterial communities
… In this thesis, I demonstrate that mucins impact bacterial communities in their physical structure as well as microbe-microbe and microbe-host dynamics. In Chapter 2, 1 study the ability of mucin surface coatings to suppress bacterial surface attachment, the first step in biofilm formation, for …
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Ecotoxicity of silver nanoparticles on estuarine and coastal bacterial communities
… may threaten non-target natural environmental bacterial communities. For this reason the main aim of this PhD project was to examine the effects of AgNPs on the functioning of natural bacterial assemblages that inhabit estuaries and coastal areas including the mechanisms behind the recovery and …
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Response to environmental change by bacterial communities in stream biofilms
… energy and organic matter to aquatic food webs. Bacterial community composition in stream biofilms is shaped by biotic interactions as well as physicochemical conditions which vary across space and time. It is, therefore, crucial to understand how natural and human-driven activities can impact …
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Long-term n fertilization affects soil bacterial communities in agronomic fields
Soil microbial communities influence plant productivity, chemistry and structure of soil and nutrient cycling. In turn, long-term nitrogen fertilization changes soil physical and chemical properties and thus influences soil microbiomes. In-depth understanding of the long-term nitrogen fertilization …
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Seasonal dynamics of edaphic bacterial communities in the hyper-arid Namib desert
… aim of this study is to investigate the edaphic bacterial community dynamics over short (57 days) and long-term (1 year) sampling intervals using an extensive sampling strategy in combination with community fingerprinting by T-RFLP analyses and micro environmental characterization. The short-term …
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Seasonal dynamics of edaphic bacterial communities in the hyper-arid namib desert
… impose constraints on edaphic microbial communities. Several studies in the Namib Desert have investigated changes in soil microbial communities across space. However, the temporal variation of edaphic bacterial community in response to seasonal microenvironmental variation in the Namib …
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Fecal Bacterial Communities as an Indicator of Trophic Interactions Among Anuran Larvae
… growth and survival of smaller tadpoles. Fecal bacterial communities have the potential to be used as indicators of changes in diet making it possible to determine if tadpoles in the wild are eating the same food or not. After feeding on two prepared diets that differed in the percentage of …
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The effects of toluene contamination on epilithic bacterial communities in a stream
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1994.
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Effects of Prebiotics on Gut Bacterial Communities and Healing of Induced Colitis in Mice
<p>Inflammatory Bowel Diseases (IBD) cause chronic inflammation of the gastrointestinal tract and debilitating symptoms in those suffering from the diseases. After inducing colitis in a mouse model using Dextran Sulfate Sodium (DSS), prebiotics inulin and oligofructose enriched inulin (OEI) were …
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Factors affecting the response of marine and estuarine bacterial communities to trace metal enrichment
… effects of trace metal perturbation on microbial communities have, to date, concentrated on contaminated environments, single phylotypes or single metals. The effects of trace metals on bacterial communities in estuarine and marine environments have been largely overlooked. The aim of this …
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Bacterial communities in glacier forefields of the Larsemann Hills, East Antarctica : structure, development & adaptation
… structure and development of glacier forefield bacterial communities, especially how soil parameters impact the microorganisms and how those are adapted to the extreme conditions of the habitat. To this effect, a combination of cultivation experiments, molecular, geophysical and geochemical …
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Influence of plant species, location, and seasonality on rhizosphere bacterial communities in freshwater wetlands
… abiotic stress tolerance. Rhizosphere microbial communities have been shown to vary according to differences in wetland vegetation. Owing to the complexity of factors influencing soil microbial community structure, a greater knowledge of the relationship between rhizosphere microbial communities …
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An Experimentally-validated Agent-based Model to Study the Emergent Behavior of Bacterial Communities
… dependent regulation of gene expression), bacterial population dynamics and emergent behavior play a key role in regulating their own life and their impact on their immediate environment. Computational models that accurately and robustly describe bacterial population behavior and response …
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Impact of Spatial Distance and Pollinators on Floral and Fruit Bacterial Communities of Solanum carolinense
Fruits and flowers house microbial communities that are unique from the rest of the plant. While a great deal is known about a handful of symbiotic microbes associated with roots and leaves, the microbial communities of fruits and flowers have received considerably less attention. Fruits are …
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Molecular characterisation of the bacterial communities in cabbage aphid (Brevicoryne brassicae) and their associated fitness effects
… is known however, about the fitness effects of bacterial associations in other aphid species. The aim of this study was to characterise bacterial diversity in a Scottish arable pest, the cabbage aphid (Brevicoryne brassicae), and investigate whether bacterial composition influences trophic …
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Understanding the temporal variability of skin-associated bacterial communities for the conservation of threatened amphibian species
… (Bd). However, while skin-associated microbial communities may alter host infection risk, the structure of these complex microbial communities can be impacted by both biotic and abiotic factors. In a series of three studies, I investigated the natural temporal and spatial variation in bacterial …
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The role of Cladophora glomerata as a habitat for bacterial communities and a reservoir of antibiotic resistance.
… and analyzed the community composition of the bacterial colonizers of C. glomerata mats by taking samples of water and C. glomerata mats from 4 sites along nearshore Lake Ontario and 2 wetland sites. Using plate screening techniques, bacteria resistant to ampicillin were found at all sites and …
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The Structure and Function of Amphibian Skin Bacterial Communities and Their Role in Susceptibility to a Fungal Pathogen
… were examined by conducting a field survey of bacterial communities from bullfrogs, newts, pond water, and pond substrate at a single pond, and newts from multiple ponds. There was variation among amphibian host species and populations in their skin symbionts, and, in a host species-specific …
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