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 160 for “"dissolved organic matter"”.
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Aluminium stabilizes dissolved organic matter by precipitation
… by large Al concentrations. Precipitation of dissolved organic matter (DOM) by dissolved Al could contribute substantially to C retention in acidic forest soils. However, no information is available on the properties of precipitated organic matter (OM) and its stability against microbial decay …
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Bioavailability of dissolved organic matter in coastal waters
Dissolved organic matter (DOM) is the largest reservoir of organic matter in the ocean containing the same amounts of carbon as atmospheric carbon dioxide. DOM consists of a mixture of compounds ultimately originating from terrestrial and aquatic plant, and microbial materials. The complex chemical …
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Marsh-Exported Dissolved Organic Matter Fate in Estuaries
<p>Dissolved organic matter (DOM) is a significant driver of estuarine productivity and nutrient cycling. The colored component of DOM, chromophoric dissolved organic matter (CDOM), impacts coastal optical properties, ocean color, and light attenuation. While marshes are largely considered sinks …
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Microbial production and consumption of marine dissolved organic matter
… are the principal producers of oceanic dissolved organic matter (DOM), the organic substrate responsible for secondary production by heterotrophic microbes in the sea. Despite the importance of DOM in marine food webs, details regarding how marine microbes cycle DOM are limited, and few …
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Microbial adaptation to dissolved organic matter in freshwater ecosystems
Dissolved organic matter (DOM) is the primary source of nutrients for heterotrophic bacteria at the base of the aquatic food web and its decomposition by microbes is a major flux in the global carbon cycle. Climate change is altering the composition of terrestrial DOM that enters into freshwaters, …
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Microbial production and consumption of marine dissolved organic matter
… are the principal producers of oceanic dissolved organic matter (DOM), the organic substrate responsible for secondary production by heterotrophic microbes in the sea. Despite the importance of DOM in marine food webs, details regarding how marine microbes cycle DOM are limited, and few …
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Molecular characterization of microbial interactions with labile dissolved organic matter
Marine microbes produce and consume labile dissolved organic matter (DOM), generating a carbon flux with significant implications for global carbon cycling and microbial ecosystems. Intracellular measurements of biological activity cannot fully capture microbial interactions with dissolved carbon. …
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Microbial cycling of marine high molecular weight dissolved organic matter
… biogeochemical cycles in the ocean. Marine dissolved organic matter (DOM) – a reservoir of organic solutes and colloids derived from plankton is a major source of carbon, nutrients, and energy to microbial communities. The biological transformation and remineralization of DOM sustains marine …
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Decomposition and Production of Dissolved Organic Matter by Aquatic Bacteria
Aquatic ecosystems transport large amounts of organic matter from the landscape to the oceans. Along this pathway, heterotrophic bacteria rapidly cycle these compounds by acting as both degraders and producers of organic compounds. Understanding the ultimate fate of the organic matter and …
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Molecular characterization of microbial interactions with labile dissolved organic matter
Marine microbes produce and consume labile dissolved organic matter (DOM), generating a carbon flux with significant implications for global carbon cycling and microbial ecosystems. Intracellular measurements of biological activity cannot fully capture microbial interactions with dissolved carbon. …
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Microbial cycling of marine high molecular weight dissolved organic matter
… biogeochemical cycles in the ocean. Marine dissolved organic matter (DOM) - a reservoir of organic solutes and colloids derived from plankton is a major source of carbon, nutrients, and energy to microbial communities. The biological transformation and remineralization of DOM sustains marine …
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Investigating dissolved organic matter cycling in High Arctic ponds and soils
As the most bioavailable fraction of organic matter, dissolved organic matter (DOM) plays an important role in the carbon (C) cycle. Heterotrophic microorganisms degrade DOM and release it to the atmosphere as carbon dioxide (CO2) under oxygenated conditions. However, some DOM may be more readily …
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The role of copper in aquatic photochemistry of dissolved organic matter
Dissolved organic matter (DOM) is a complex and heterogeneous mixture of organic compounds ubiquitous in the aquatic environment. The aquatic photochemistry of DOM is an important mechanism for driving biogeochemical element cycling and for the attenuation of organic contaminants in natural sunlit …
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Linking Carbon Dynamics in Stream Ecosystems to Dissolved Organic Matter Quality
… form of CO2 from groundwater, streams receive organic matter from aquatic and terrestrial origins which is partly mineralized to inorganic nutrients and CO2. Future predictions suggest enhanced input of terrestrial organic matter into streams. As such, surrounding land use may highly influence …
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Reactivity and Chemical Characterization of Dissolved Organic Matter in an Estuary
… determining the enhanced aqueous solubility of organic compounds by natural aqueous DOM is a promising new tool for investigating the reactivity of DOM. Applying the method to Dismal Swamp DOM shows that the reactivity differences between high molecular weight, low molecular weight, and total …
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Chemical controls on the cycling and reactivity of marine dissolved organic matter
Marine dissolved organic matter (DOM) is an actively cycling reservoir of carbon containing thousands of unique compounds. To describe the complex dynamics that govern the biological transformation and decomposition of compounds in this molecular black box, models of DOM reactivity use chemical …
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Chemical Controls on the Cycling and Reactivity of Marine Dissolved Organic Matter
Marine dissolved organic matter (DOM) is an actively cycling reservoir of carbon containing thousands of unique compounds. To describe the complex dynamics that govern the biological transformation and decomposition of compounds in this molecular black box, models of DOM reactivity use chemical …
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In-Stream Reactivity of Dissolved Organic Matter and Nutrients in Proglacial Watersheds
… to better understand in-stream processing of dissolved organic matter (DOM) and nutrients during downstream transport. Specifically, this study paired glacial streams with nearby non-glacial streams and compared differences in landscape controls to: 1) evaluate the impact of glacial landcover …
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Climate Change and Dissolved Organic Matter in Subarctic Lakes: Relevance to Methylmercury Bioavailability
… uptake by phytoplankton, is regulated by dissolved organic matter (DOM). Methylmercury binds strongly with DOM, especially high-molecular weight (HMW) compounds containing reduced sulphur; this binding decreases MeHg bioavailability. Climate-induced changes were measured at the landscape …
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