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 24 for “"microbial ecosystems"”.
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Emergent behaviors in complex microbial ecosystems
… or the strength of interactions increases, microbial ecosystems transition through three distinct dynamical phases: from stable coexistence, to partial coexistence, to the emergence of persistent fluctuations and alternative stable states in species abundances, confirming theoretical …
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Exploring multispecies evolutionary dynamics using model microbial ecosystems
… many other species. We developed experimental microbial ecosystems with which we can start to answer some of the fundamental questions regarding evolution in complex ecosystems. We first tested how the evolution of cooperation within a species can be affected by the presence of competitor …
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Carbon cycling and functional redundancy in closed microbial ecosystems
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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The Impacts of Disruptive Environmental Change on Vital Microbial Ecosystems
… and functional & taxonomic composition, microbial communities determine ecosystem services and stability. Through a mix of experiments, observational studies, and theory, we investigate the dynamic interplay between microbes and their changing environment.</p><p>In our first research …
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Effect of microbial ecosystem from wild herbivores browsing tanniferous plants on goat rumen fibrolytic activity
Ruminant have developed advanced microbial ecosystem for digesting fibrous feedstuffs over the past years. The efficiency of harnessing energy from these forages is still a major problem as less than 60% of forages consumed are still passed out as faeces. Many factors have been associated with the …
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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 hosts of bacteriophage transduction in microbial communities with RNA-addressable modification
… important ecological interactions in all microbial ecosystems by killing their host organism or contributing to the rapid evolution of bacteria via horizontal gene transfer (HGT). Because of these traits, phages are increasingly being applied to manipulate microbial communities by killing …
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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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ANALYSIS OF MICROBIOME IN VARIOUS HUMAN MEDICAL CONDITIONS USING NEXT-GENERATION SEQUENCING OF THE 16S rRNA GENE
… offer a unique perspective into the complex microbial communities within the body. Influenced by age, gender, and disease, it mirrors broader microbial ecosystems. This study specifically delves into the ocular and gastrointestinal tract microbiome, comparing its composition in 43 healthy and …
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Surveying and harnessing the genetic, (meta)genomic, and metabolic potential of the deep carbonated biosphere
… and nutrient cycling in deep subsurface sCCO₂ microbial ecosystems at McElmo Dome. Supercritical CO₂ is frequently used as a solvent for compound extraction and in vitro biocatalysis. However, due to its lethal effects, scCO₂ has previously been considered inaccessible for in vivo microbial …
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In vitro Recapitulation of the Polymicrobial Communities Associated with Cystic Fibrosis Airway Infections
… are prone to lifelong colonisation with dense microbial ecosystems comprised of a diverse combination of bacteria and fungi. The role of interspecies interactions in modulating changes in gene expression and the metabolism of individual members of a polymicrobial community, compared with growth …
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The ecology of prophages at the microscale
Microbial communities shape nearly every habitat on Earth. Delineating the principles by which microbial collectives assemble, function, and evolve across systems is fundamental to transforming microbial ecology from an observational science to a predictive one. In this thesis, I argue that …
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Two's More Fun than One: How the Presence of Multiple Nutrients Changes Microbial Competition and Foraging in Unexpected Ways
… in the order in which resources are depleted in ecosystems with a pulsed resource supply and show that these temporal niches reshape community structure, vastly increasing the expected diversity of microbial ecosystems. Finally, I present a novel differential strategy in which a microbe …
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Population Dynamics In A Model Closed Ecosystem
… are needed over many generations. Laboratory microbial ecosystems afford the short time and length scales required for such measurements. Their conventional implementations, batch cultures with period refreshment of growth medium or chemostats with continuous refreshment, have a number of …
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Phase transitions in fluids and biological systems
… seemingly different fields: fluid dynamics and microbial ecology. In these systems, the unifying features are the existences of global non-equilibrium steady states. I consider generic and statistical models for transitions between these global states, and I relate the model results with …
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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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Heterotrophic Microbial Colonization of the Interior of Shocked Rocks from the Haughton Impact Structure, Devon Island, Nunavut, Canadian High Arctic
… restricting the impact structure ecosystem to microbial communities. As such, it provides a unique opportunity to examine, in a natural setting, the microbiological colonization of impact-shocked rocks. This colonization is facilitated primarily by the creation of interconnected fissures and …
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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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Impact assessment of different agricultural practices in grapevine soil and must microbiota
… the composition and functionality of these microbial communities. However, most studies on emerging practices in viticulture have not incorporated a microbiological perspective, limiting our understanding of their real impact on the agroecosystem. In this thesis, we hypothesized that …
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Liberation of low molecular weight organic acids from sedimentary organic matter and their role on microbial activity
… and acetate are the most common LMWOAs used for microbial metabolism. In terrestrial mud volcanoes (TMVs), sedimentary material is rapidly ascending from great depth to the surface. Therefore LMWOAs that were produced from buried macromolecular organic matter at depth are also brought up to the …
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