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 669 for “"Biogeochemical"”.
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Modelling biogeochemical controls on planetary habitability
… zone, which was then coupled with a zero-D biogeochemical carbon cycle model to investigate the operation of the carbonate-silicate cycle under conditions of varying incident stellar flux and planet size. The Earth will remain within habitable temperature limits for 6.34 Gyr (1.8 Gyr from …
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Biogeochemical applications of compound-specific radiocarbon analysis
Compound-specific carbon isotopic (δ13C and Δ14C) data are reported for lipid biomarkers isolated from Santa Monica Basin (SMB) and Santa Barbara Basin (SBB) surface sediments. These organic compounds represent phytoplanktonic, zooplanktonic, bacterial, archaeal, terrestrial, and fossil carbon …
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Microbial-biogeochemical interactions in tropical lacustrine environments
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-05-01
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Biogeochemical applications of compound-specific radiocarbon analysis
Compound-specific carbon isotopic (613C and A14C) data are reported for lipid biomarkers isolated from Santa Monica Basin (SMB) and Santa Barbara Basin (SBB) surface sediments. These organic compounds represent phytoplanktonic, zooplanktonic, bacterial, archaeal, terrestrial, and fossil carbon …
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Biogeochemical Alteration of Particulate Pyrogenic Organic Carbon (pyC)
<p>The resistance of plant derived pyrogenic organic carbon (<em>py</em>C) to abiotic and biotic means of degradation has led to increased interest in the role of <em>py</em>C as a potential carbon sink, as well as a strategy for sequestering atmospheric CO2 to mitigate excess carbon emissions. …
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Biogeochemical reconnaissance survey of Chandalar quadrangle, Alaska, A
Includes bibliographical references.
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What are the biogeochemical consequences of heuweltjie formation?
This study was to determine whether the basal calcrete layer of heuweltjies derives its nutrients from local or exotic sources and also to estimate relative rates of deposition and an approximate age of the heuweltjie. By calculating deposition rates and by using data from Soderberg and Compton …
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Biogeochemical Cycling of Manganese in Drinking Water Systems
This work represents an interdisciplinary effort to investigate microbiological and chemical manganese (Mn) cycling in drinking water systems using concepts and tools from civil and environmental engineering, microbiology, chemistry, surface science, geology, and applied physics. Microorganisms …
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Quantifying ocean carbon and oxygen cycles using Biogeochemical Argo
… of the ocean carbon and oxygen cycles using Biogeochemical (BGC) Argo, which is a global array of autonomous drifting profiling floats. Chapter 2 of this thesis addresses the question of: “How can we improve BGC-Argo float oxygen measurement and address biases related to sensor response …
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Biology and potential biogeochemical impacts of novel predatory flavobacteria
Predatory bacteria are ubiquitous in aquatic environments and may be important players in the ecology and biogeochemistry of microbial communities. Three novel strains belonging to two genera of marine flavobacteria, Olleya and Tenacibaculum, were cultured from coastal sediments and found to be …
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Nitrate isotope anomaly as a tracer of biogeochemical processes
… fractionation) signature as a tracer of biogeochemical processes. Nitrate δ15N, δ17O and δ18O of water samples collected at the Marano lagoon (Italy) have been analysed, by combining the denitrifier method with the N2O thermal decomposition in a gold furnace. No clear correlation between …
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Biology and potential biogeochemical impacts of novel predatory flavobacteria
Predatory bacteria are ubiquitous in aquatic environments and may be important players in the ecology and biogeochemistry of microbial communities. Three novel strains belonging to two genera of marine flavobacteria, Olleya and Tenacibaculum, were cultured from coastal sediments and found to be …
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A biogeochemical investigation of Trunk River Lagoon, Falmouth, Massachusetts
This thesis delves into the intricate dynamics of lipid biomarker creation, deposition and preservation within Trunk River Lagoon, encompassing sediments, microbial blooms, and mats. Through a multi-faceted approach, the research uncovers the interplay between natural processes and anthropogenic …
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Headwater stream network connectivity: biogeochemical consequences and carbon fate
… Though headwater streams integrate many biogeochemical signals from the watersheds they drain and provide important ecosystem services, their diverse habitats and dynamic changes in wet length have been under- examined compared to dendritic, perennial streams. This oversight complicates …
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Biogeochemical controls on arsenic cycling in a hydrocarbon plume
Arsenic (As) in drinking water poses a critical threat to public health. More than 150 million people worldwide are at risk of developing diseases from unsafe concentrations of As in groundwater. Arsenic occurs naturally in rocks, soils, and sediments and generally remains associated with solid …
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Biogeochemical and phylogenetic signals of Proterozoic and Phanerozoic microbial metabolisms
Life is ubiquitous in the environment and an important mediator of Earth’s carbon cycle, but quantifying the contribution of microbial biomass and its metabolic fluxes is difficult, especially in spatially and temporally-remote environments. Microbes leave behind an often scarce, unidentifiable, or …
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Hydrological and biogeochemical cycling along the Greenland ice sheet margin
… the interdependence of glacial hydrology and biogeochemical cycling in terms of export of carbon and iron from the Greenland ice sheet. I develop a new isotope mixing-model to quantify water source contributions to the bulk meltwater discharge draining a GrIS outlet glacier. Results illustrate …
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Coupled Biogeochemical Cycles of Iron and Organic Carbon in Soils
… knowledge gap for understanding the coupled biogeochemical cycles of C and Fe.This study comprehensively investigated the amount and characteristics of Fe-bound OC in forest soils as well as the coupled biogeochemical reactions of Fe and OC during redox processes. Iron-bound OC contributed …
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Biogeochemical drivers of microbial methane removal in eutrophic coastal waters
Contains fulltext : 310766.pdf (Publisher’s version ) (Open Access)
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Seaglider observations of biogeochemical variability in the Iberian upwelling system.
… providing high spatial and temporal resolution biogeochemical data through the use of an autonomous underwater gliderthe Seaglider. SG510 “Orca” was outfitted with sensors to measure dissolved oxygen, temperature, salinity, chlorophyll a (chl a), coloured dissolved organic material (CDOM) and …
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