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 25 for “"microbial mats"”.
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Identification of Quorum Sensing Genes in Hypersaline Microbial Mats
… unexplored biological reservoirs on earth. Microbial communities carry out biochemical processes, interactively, by functioning as social units and ultimately define the overall functionality of ecosystems. Bacterial communities in all ecosystems likely utilize signaling pathways to adapt to …
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Complex lipids in microbial mats and stromatolites of Hamelin Pool, Shark Bay, Australia
… structures, are potentially some of the oldest, microbially mediated fossils visible in the rock record; if biogenesis is able to be confirmed for these ancient stromatolites, some being greater than 3 billion years old, these ancient stromatolites could be used to demonstrate the microbial …
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Complex lipids in microbial mats and stromatolites of Hamelin Pool, Shark Bay, Australia
… structures, are potentially some of the oldest, microbially mediated fossils visible in the rock record; if biogenesis is able to be confirmed for these ancient stromatolites, some being greater than 3 billion years old, these ancient stromatolites could be used to demonstrate the microbial …
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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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Multi-scale Studies of Microbial Mats and Biocrusts: Integrating Remote Sensing with Field Investigations in Antarctica's McMurdo Dry Valleys
… more extreme ecosystems. In dense associations, microbial organisms can form visually conspicuous layers on sediment, soil, and rock surfaces, called microbial mats and biological soil crusts (i.e., biocrusts). Both microbial mats and biocrusts consist of cyanobacteria, moss, diatoms, and green …
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Microbiology of the sulfur-dominated glacial ecosystem at Borup Fiord Pass, and high Arctic low-temperature spring associated microbial mats, The
… also make BFP an ideal location for studying how microbial organisms can utilize reduced and oxidized forms of sulfur to thrive in cold environments. Yet, due to human influence Arctic research sites may not remain cold perpetually also making the location ideal to study climate change. Over field …
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Microbiology of the sulfur-dominated glacial ecosystem at Borup Fiord Pass, and high Arctic low-temperature spring associated microbial mats, The
… also make BFP an ideal location for studying how microbial organisms can utilize reduced and oxidized forms of sulfur to thrive in cold environments. Yet, due to human influence Arctic research sites may not remain cold perpetually also making the location ideal to study climate change. Over field …
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Microbial Mat Abundance and Activity in the McMurdo Dry Valleys, Antarctica
… the main drivers of primary production. These microbial communities form multi-layered sheets (i.e., microbial mats) on top of desert pavement. The cryptic nature of these communities, their often patchy spatial distribution, and their ability to survive desiccation make assessments of …
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Bacterial and archaeal community structure across a gradient of saline lakes in Kiritimati, Republic of Kiribati
Microbial mats, multilayered sheets of microorganisms often found in extreme environments, are increasingly gaining attention for their utility and influence on the global carbon cycle. However, our understanding of the organisms that define microbial mats and how they vary across environmental …
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Marine carbohydrate-active enzymes illuminate microbial ecology, evolution, and carbonate precipitation
Marine carbohydrate-active enzymes (CAZymes) in microbial mats build, modify, and degrade the matrix of exopolymeric substances (EPS) that structure these ancient ecosystems and control mineral formation via the alkalinity engine and organic surfaces involved in mineral nucleation and growth. …
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Streams, stromatolites and the geometry of growth
… to a diffusive flux. The first system is a microbial mat which overlays a layer of precipitated mineral. The microbial mat grows in response to the diffusion of nutrients while the mineral layer grows in response to the precipitation of dissolved ions which diffuse through the microbial mat. …
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Influence of landscape-variation in geochemistry on taxonomic and functional composition of microbial mat communities in the McMurdo Dry Valleys, Antarctica
Microbial communities play critical roles in biogeochemical cycles of aquatic and terrestrial ecosystems, but studies of soil microbial communities have been limited by the diversity and complexity found in most ecosystems. Here we report on work investigating the functional diversity of microbial …
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Influence of Organic Matter Source, Abundance, and Growth Habit on Depositional Textures and Associated Pore Attributes of Hypersaline Lacustrine Microbial Deposits (Holocene, Bahamas)
Discovery of lacustrine microbialite reservoirs in South Atlantic pre-salt has motivated the search for analogs for perspectives on their deposition and initial porosity. Although previous efforts mapped spatial patterns and produced facies models of large microbial lacustrine systems, details of …
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An Investigation of the Geochemistry and Hydrogeology of the Queen Charlotte Fault
… column anomalies (i.e seeps), mud volcanoes, microbial mats, and indicators of seabed fluid flow along the QCF. Analyses of pore fluids recovered from the 2017 cruise revealed abundant overprinting signatures of carbonate precipitation, anaerobic oxidation of methane, and particulate organic …
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Stable isotope and organic biomarker analysis of the late Proterozoic Coppercap formation in the MacKenzie Mountains
… basin with purple and green sulfur bacteria microbial mats. This suggest persistent hydrogen sulfide rich waters in the shallow photic zone persisted until the Sturtian.
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Stromatolitic Knobs in Storrs Lake, San Salvador, Bahamas: Insights into Organomineralization
… Island, Bahamas, contains well-developed microbial mats, some of which have developed calcified structures called microbialites. Many of these microbialites are laminated, and therefore classified as stromatolites. This study focuses on small stromatolitic knobs located in the southern …
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A biogeochemical investigation of Trunk River Lagoon, Falmouth, Massachusetts
… Trunk River Lagoon, encompassing sediments, microbial blooms, and mats. Through a multi-faceted approach, the research uncovers the interplay between natural processes and anthropogenic influences, shedding light on the evolutionary trajectory of this aquatic ecosystem. From ancient sediment …
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The Effect of Nitrates, pH, and Dissolved Inorganic Carbon Concentrations on the Extracellular Polysaccharide of Three Strains of Cyanobacteria Belonging to the Family Nostocaceae
… structure of cyanobacterial biofilms and microbial mats found in nature. As cyanobacteria are ubiquitous organism both now and in the past, they play a pivotal role in the biological and geological processes of the Earth, controlling the availability and cycling of carbon and nitrogen both …
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Assessing the Role of Solution Chemistry and Organic Matter in the Genesis of the Dengying Formation Dolostones at Sichuan Basin, China
… that produce dolomite phases associated with microbial surfaces and metabolism, support a microbial model for dolomite formation. However, more research is needed to substantiate this model. This study here aims to clarify the role of organic matter abundance and solution chemistry in a …
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The Geobiology of the Paleoproterozoic Belcher Group, Nunavut, Canada
… Group Microbiota (BGM) are a collection of microbial organisms from the Paleoproterozoic (~2.0 to 1.8 Ga) Belcher Group from the Belcher Islands, Nunavut, Canada. The Belcher Group is exceptionally well-preserved, having avoided deep burial or strong deformation during the Trans-Hudson …
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