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.
Results
Showing 1 to 20 of 55 for “"microbial interactions"”.
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Microbial interactions with epithelial surfaces.
Background. Staphylococcus aureus is an important gram positive pathogen that causes a multitude of human diseases. Many of these diseases are associated with the production of staphylococcal exotoxins. Superantigens are a family of staphylococcal exotoxins associated with many of these illnesses. …
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Host Immune-Microbial Interactions in Inflammatory States
… co-expression and transcription factor-gene interactions further implicated weakened transcriptional regulation of dendritic cell activation pathways. To characterize the gut microbiome in sarcoidosis, taxonomic and functional profiles were constructed from metagenomic shotgun sequencing of …
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Host-Microbial Interactions that Modulate Luminal IgA
… IgA levels were heritable, transmissible, and microbially driven. In addition, the IgA-Low phenotype was dominant and functionally resulted in increased intestinal injury by DSS. Utilizing the primary epithelial monolayer system and IgA transcytosis assay, I found that anaerobically cultured …
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Bioinstrumentation and Statistical Methods for Investigating Host-Microbial Interactions
Metabolic interactions between hosts and their associated microbiota, the latter referred to as the microbiome, contribute to the host phenotype and nutrient cycling within the ecosystem. There is broad diversity in the type and complexity of interactions for a given host and environment. …
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Molecular characterization of microbial interactions with labile dissolved organic matter
… implications for global carbon cycling and microbial ecosystems. Intracellular measurements of biological activity cannot fully capture microbial interactions with dissolved carbon. Better understanding this carbon flux thus requires direct and compound-specific characterization of …
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Molecular characterization of microbial interactions with labile dissolved organic matter
… implications for global carbon cycling and microbial ecosystems. Intracellular measurements of biological activity cannot fully capture microbial interactions with dissolved carbon. Better understanding this carbon flux thus requires direct and compound-specific characterization of …
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Molecular mechanisms of microbial interactions in model systems and natural environments
… bacteria, archaea and single-celled eukaryotes. Interactions between marine microbes impact global biogeochemical cycles and form the base of marine food webs. Interactions range from symbiotic to parasitic, and are mediated through nutrient exchanges and chemical signals. In this dissertation, I …
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Investigation of mechanisms underpinning host-microbial interactions in the gastrointestinal tract
… cellular mechanisms underpinning host-bacterial interactions in both the gastrointestinal tract and in extra-intestinal tissues. In the first study (Chapter II) we identified the relative contributions of different pattern recognition receptors to the triggering of macrophage cytokine responses …
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Investigating the impact of microbial interactions with geologic media on geophysical properties
… study were to investigate the effect of: (1) microbial metabolic byproducts, microbial growth, and biofilm formation on the low frequency electrical properties of porous media, (2) biofilm formation on acoustic wave properties, and (3) the natural electrical (self-potential) signatures …
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Microbial interactions associated with biofilms attached to Trichodesmium spp. and detrital particles in the ocean
… beyond its involvement in certain symbiotic interactions. The objectives of this thesis were to constrain the chemical stability of AHLs in seawater, explore the production of AHLs in marine particulate environments, and probe selected behaviors which might be controlled by AHL-QS. I …
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Microbial interactions associated with biofilms attached to Trichodesmium spp. and detrital particles in the ocean
… beyond its involvement in certain symbiotic interactions. The objectives of this thesis were to constrain the chemical stability of AHLs in seawater, explore the production of AHLs in marine particulate environments, and probe selected behaviors which might be controlled by AHL-QS. I …
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Longitudinal colonisation by Streptococcus pneumoniae and nasopharyngeal microbial interactions in health and disease: a South African birth cohort study
… with other respiratory pathogens and how such interactions may contribute development of severe disease.
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Elucidating microbial interactions, adaptations, and evolution under extreme environmental conditions in modern microbial mats from Shark Bay, Western Australia
Fossilized microbial mats dating back 2+ Ga record some of the earliest evidence of life on Earth. These ancient pustular mats preserve evidence of microbial production of extracellular polymeric substances (EPS), revealing the potential importance of EPS in the protection and preservation of these …
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Disentangling plant-microbe interactions under environmental change
… carbon: nitrogen (C:N) ratios and shifting plant-microbial interactions, on which plants are largely dependent. This thesis addresses the potential impacts on plant-microbial interactions under different C:N fertiliser regimes and water-availability by analysing the overall and N-cycling …
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Soil microbial community dynamics associated with agricultural crops
… on our ability to understand and manage the interactions 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 …
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Microbial Dynamics and Mechanistic Insights into a Hydrogenotrophic Denitrifying Microbial Consortium
… greenhouse gases (N2O and CO2). This is due to microbial competition for limited organic electron donors such as methanol and acetate. Recently, autotrophic denitrification using hydrogen as a clean electron donor, also known as “hydrogenotrophic denitrification”, has garnered increasing …
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Response of Arabidopsis to bacterial presence under iron stress
… In response to these stressful conditions, microbial interactions can lead to improved plant health, however the mechanism by which this occurs is not understood. In this study we cocultured an Arabidopsis MTP8 knockout line, which is susceptible to iron stress, as well as a subset of a …
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Sources of Variation in the Microbiome of Pre-Weaned Dairy Calves
This study investigated the microbial colonization and maternal influences on the neonatal calf gut microbiome. Microbiome samples were collected from dams (n = 6) and calves (n = 6) using sterile flocked swabs. The vaginal, oral, and fecal bacterial communities were examined from the dam and the …
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