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 142 for “"Microbial populations"”.
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Metabolic heterogeneity in microbial populations
… their environment and grow. We model independent microbial cells, each with their own set of enzyme copy numbers sampled from experimental distributions, and use flux balance analysis (FBA) to compute the optimal way that each cell can use its metabolic pathways—an approach we dubbed Population …
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The eco-evolutionary dynamics of microbial populations
Microbes have adapted to life in complex microbial communities in a large variety of ways, and they are continually evolving to better compete in their changing environments. But identifying the conditions that a particular microbe thrives under, and how they have become adapted to those condition …
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Phenotypic heterogeneity and evolutionary games in microbial populations
… variability between individual cells in clonal microbial populations, even in identical environments. While some variation is an inevitable consequence of low numbers of regulatory molecules in cells, the magnitude of the variability is nevertheless an evolvable trait whose quantitative …
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Interactions between bifidobacteria and other human intestinal microbial populations
La microbiota intestinal es un ecosistema dinámico influenciado por factores como la dieta, enfermedades o la edad. Produce vitaminas, así como ácidos grasos de cadena corta (AGCC) a partir de carbohidratos no digeribles de la dieta, y protege frente a patógenos. Tres de los géneros más …
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CRISPR immune diversity in simulated and natural microbial populations
… applications of diverse CRISPR immune alleles in microbial populations. Using a mathematical model of CRISPR-mediated host-virus coevolution to simulate microbial populations, we observe the emergence of multiple coexisting CRISPR alleles in a single population, which we call distributed immunity. …
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Horizontal gene transfer as a cohesive force in microbial populations
Populations are the central unit of evolution and ecology. In the context of evolution, populations are commonly defined as groups of organisms with a shared gene pool in which adaptive genes can spread freely through natural selection. Ecology takes a less abstract view of populations and …
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Impact of pollution sources of microplastics and associated microbial populations in surface water
Submitted in fulfilment of the academic requirement for the degree of Masters in Applied Sciences: Biotechnology, Durban University of Technology, Durban, South Africa, 2024.
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Spatial dynamics of microbial populations driven by social interactions and horizontal gene transfer
The functions of the microbial ecosystems are closely related to the spatial structures formed by microbial communities. Yet, it is not well understood what determines, controls and regulates the spatial dynamics of microbial populations. In this study, we use synthetic microbial consortia as our …
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The role of microbial populations in the cycling of iron and manganese from marine aggregates
… Within aggregates the oxygen depleted by aerobic microbial respiration may<br/>not be replaced rapidly, generating anoxic or suboxic microzones. Reduced<br/>compounds that are unstable in the oxygenated water column have been previously<br/>found associated with marine snow. Therefore, in the …
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Impact of Sanitizers on Salmonella enterica Contamination and Microbial Populations of Poultry Processing Reuse Water
<p>As human populations increase in numbers, access to clean, fresh water is becoming increasingly difficult to balance between agricultural and municipal demands. Water scarcity is a limiting factor of food production in many countries, whether they are emerging or established economies. In …
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Glucooligosaccharides and Fructooligosaccharides Alter Microbial Populations and Fermentation Characteristics in Animal Models and Human Subjects
… their effects on nutrient digestibility, gut microbial populations, and fecal characteristics in vivo. The second experiment evaluated FOS supplementation of dogs consuming either plant-based diets or meat-based premium type diets to determine its effects on nutrient digestibility, microbial …
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Investigation of the microbial populations in the activated sludge of the Hoechst-Celanese wastewater treatment plant
The microbial populations in the Hoechst-Celanese activated sludge were examined. Heterotrophs, denitrifiers, sulfate-reducers, protozoa and filamentous bacteria were enumerated. Variations in microbial populations were compared with influent and effluent constituent concentrations, and with …
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The effects of acetate concentrations on competition between microbial populations in enhanced biological phosphorus removal from wastewater
Enhanced biological phosphorus removal (EBPR) is a popular modification of the activated sludge process, and has been studied and applied for decades. It was hypothesized that the bacteria responsible for EBPR, polyphosphate accumulating organisms (PAOs), have an advantage over their competitors, …
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Influence of Oilseeds on Ruminal Microbial Populations and Fermentation Patterns in Vivo and in Rumen-simulating Fermenters
… to examine the effects of oilseeds on ruminal microbial metabolism. Experiment 1 utilized six rumen-simulating fermenters in six-7 d periods to screen diets for successive experiments 2 and 3. Fermenters were fed 10 g of their perspective diet twice daily and contained a dilution rate of .05 S …
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The Effect of Various Feed Additives on Growth Performance, Nutrient Utilization, and Cecal Microbial Populations in Poultry
… nutrient utilization, and select cecal microbial populations in poultry. Unless otherwise noted, all diets were corn soybean meal. In the first study, inulin, oligofructose, short-chain fructooligosaccharide (SCFOS), mannanoligosaccharide (MOS), and transgalactooligosaccharide (TOS) were …
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Effects of iso-alpha-acids on rumen fermentation and comparison of microbial populations between rumens and continuous culture fermenters
… 2 used 16S amplicon sequencing to compare microbial populations between the rumen of dairy cattle and continuous culture fermenters and to determine the temporal changes in microbial community during fermenter operation. Redundancy analysis (RDA) was performed to determine correlations …
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Prebiotics and Probiotics: Impact on Gut Microbial Populations, Nutrient Digestibilities, Fecal Protein Catabolite Concentrations, and Immune Function of Humans and Dogs
These experiments demonstrated that prebiotic and (or) probiotic supplementation seems to improve indices associated with gut health of humans and dogs. However, caution should be taken, as LAC supplementation did result in some negative effects (e.g., increased fecal putrefactive compounds). …
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Effects of a lactobacillus fermentation product on the fecal characteristics, fecal microbial populations, immune function, and stress markers of adult dogs
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-09-01 without embargo terms
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Effects of direct-fed Bacillus pumilus 8G-134 (NRRL B-50174) on ruminal and fecal microbial populations of pre- and postpartum Holstein cows
Direct-fed microbials (DFM) are used as feed supplements in agricultural industry to enhance animal health and performance. The effects of Bacillus pumilus 8G-134 (NRRL B-50174) as a feed supplement were investigated through 16S rRNA gene-based inferences about community structure changes, …
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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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