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 551 for “"microbial communities"”.
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Strategies for engineering microbial communities
Understanding how microbes assemble into communities is a fundamental open question in biology, with applications to human health, environmental sustainability, and metabolic engineering. Although it is known that the competition and exchange of nutrients (i.e., metabolic interactions) shape …
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Multiscale modeling of microbial communities
… exist in nature primarily in the form of complex communities, participating in a vast array of social interactions through regulatory gene networks. The social interactions between individual cells drive the emergence of community structures, resulting in an intricate relationship across multiple …
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Emergent behaviors in microbial communities
… structures, and symmetries at larger scales. Microbial communities, which play indispensable roles in nature, are complex active systems that naturally pushes us to the unexplored frontier of emergent phenomena. During my PhD, I studied how some behaviors of microbial communities can be simple …
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Environmental modulation of microbial communities
Microbial communities are crucial to the health of all ecosystems, and their vast diversity constitutes the majority of species on Earth. A single sample of such a community immediately reveals its complexity, but simultaneously the challenges to understanding its form and function. First, a sample …
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Petroleum effects on soil microbial communities
… hydrocarbons. This work aimed to evaluate microbial community shifts in soils under crude oil contamination and assess the effects of Biodiesel co-product (BCP) as a protecting agent of soil microbiota under crude oil addition. We used soils from the Trindade Island and from the Highfield …
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Improving Our Comprehension of Microbial Communities
… commonly used methodologies for characterizing microbial communities. The use of universal genes, such as those for small subunit ribosomal ribonucleic acid (SSU rRNA), or randomly sequenced genome fragments form the foundation upon which a majority of microbiologists evaluate community …
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Mechanistic modeling of complex microbial communities
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-15 without embargo terms
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Stream microbial communities along an agricultural gradient
… and nitrogen (N) cycling, responses of microbial communities to N additions within watersheds is not well understood. Agriculture contributes excess N into stream systems, predominantly as ammonia, which is transformed through nitrification into nitrate by prokaryotes that produce the …
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Understanding microbial communities through horizontal gene transfer
Microbial communities represent the majority of biodiversity on Earth and underpin key ecosystem functions. Motivated by the experimental observation that communities from garden composts were capable of maintaining high diversity in single-carbon-source microcosms, I started by tracing the …
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Microbial Communities of Healthy and Diseased Corals
The extent of phenotypic plasticity in the corallite morphology of colonies of M. annularis s.s. was determined by analyzing the three-dimensional morphology of calical surfaces and the two-dimensional corallite morphology as represented in transverse thin sections. Significant phenotypic …
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Microbial Communities Colonizing Leaves during Early Decomposition Stages
<p>Microbial communities associated with decaying leaves play an important role in the cycling of nutrients in stream ecosystems. In headwater streams that are deemed as heterotrophic, bacteria and fungi are main drivers of organic matter decomposition and thus partly responsible for facilitating …
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The diversity and functioning of coastal microbial communities
Microbial communities are notably complex and underpin many important global biogeochemical processes. However, there is still much that we do not know regarding the structuring dynamics of microbial communities and their biodiversity-ecosystem functioning (BEF) relationships. Therefore, there is …
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Mathematical Modelling of Emergent Survival in Microbial Communities
… governing emergent survival dynamics in microbial communities, with a focus on elucidating complex interaction networks that determine community stability, invasion success, and resilience to external perturbations. The concept of emergence – where community-level behaviours and …
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Identifying ecological differentiation in microbial communities across taxonomic scales
Microbial diversity, both genetic and phenotypic, is a product of evolutionary and ecological processes interacting at multiple levels of biological organization. High-throughput sequencing is providing a means to resolve the vast amount of genetic diversity in microbial assemblages. However, a …
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Evolutionary Consequences of Metabolic Competition and Cooperation in Microbial Communities
Microbial communities are ubiquitous and perform functions fundamental to life on earth. The high density of organisms within them and the many ways in which these species interact with each other result in limitless opportunities for competition and cooperation to affect the fitness of individual …
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A phylogenetic framework for large-scale analysis of microbial communities
… phylogenetics allows researchers to study microbial evolution, resolve strain-level relationships between microbes, and also taxonomically place and characterize novel and unknown microbial genomes. This thesis presents a novel computational phylogenetic approach implemented during my …
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ASSESSING THE IMPACT OF EMERGING CONTAMINANTS ON ANAEROBIC MICROBIAL COMMUNITIES
The impact of emerging contaminants on anaerobic microbial communities is critical and
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The Principles and Applications of Plasmid Transfer in Microbial Communities
… maintenance of diverse traits and functions in microbial communities. This role depends on the plasmid’s ability to persist in a population. However, for a community consisting of multiple populations transferring multiple plasmids, the conditions underlying plasmid persistence are poorly …
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Composition and activities of microbial communities in Alberta’s oil sands
… resource. This thesis focuses on determining the microbial communities in Alberta’s oil sands and their activities with the intention of eventually utilizing this information for improved production strategies. The microbial communities from oil sands outcrops, mined oil sands and oil sands cores …
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