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 1463 for “"Organic matter"”.
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Aluminium stabilizes dissolved organic matter by precipitation
… 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 although …
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Opto-Electronic Sensing of Soil Organic Matter
Made available in DSpace on 2014-12-14T06:37:11Z (GMT). No. of bitstreams: 1 8009080.pdf: 4545676 bytes, checksum: 42e6f2f424de178d35c741b9d01b44e4 (MD5) Previous issue date: 1979
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Near-infrared reflectance soil organic matter sensor
In-field sensing of soil organic matter content would be desirable to provide a control input for the variation of soil-applied herbicide application rates. Control based on organic matter content could eliminate overapplication on less productive areas within a field, thereby improving …
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Comprehensive Analysis of Effluent Organic Matter from Five Wastewater Treatment Plants in Connecticut and Comparison to Natural Organic Matter
<p>Natural organic matter is an important driver of biotic and abiotic processes in aquatic environments. Wastewater treatment plants discharge a substantial amount of organic matter into the environment; however effluent organic matter has not been well studied. In this study, traditional organic …
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An Assessment of the Contribution of Terrestrial Organic Matter to Total Organic Matter in Sediments in Scottish Sea Lochs
… by using lignin as the biomarker for terrestrial organic matter. The oxygen uptake rate, percentage organic matter due to loss on ignition, Rp index, total carbon, total organic carbon (TOC), total nitrogen, C/N<br/>ratio, and phosphate content were used as the proxies to determine the …
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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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The analysis of organic matter in oil-shales
The organic matter in five oil shales (three from the Kimmeridge Clay sequence, one from the Oxford Clay sequence and one from the Julia Creek deposits in Australia) has been isolated by acid demineralisation, separated into kerogens and bitumens by solvent extraction and then characterised in some …
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Rotavirus interactions with silica and natural organic matter
… presence or absence of Suwannee Riven natural organic matter (SRNOM). Rotavirus aggregation was detected in SRNOM and divalent cation-containing solutions, and was faster than in the solely presence of divalent cations. Calculated attachment efficiencies were always higher in CaCl2 than MgCl2 …
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Quantifying soil particulate organic matter using image analysis
Rapid and cost-effective quantification of soil organic carbon (SOC) fractions that are responsive to management will improve soil health assessment and associated decision support tools. The particulate organic matter (POM) fraction of SOC is of interest due to its sensitivity to management and …
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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 definitive …
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Plant organic matter mobilization and export in fluvial systems
… that control mobilization and transport of plant organic matter (pOM) through rivers towards sedimentation basins. I investigated this aspect in the eastern Nepalese Arun Valley. The trans-Himalayan Arun River is characterized by a strong elevation gradient (205 − 8848 m asl) that is accompanied …
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Stormwater and organic matter in the urban stream continuum
<p>Dissolved organic matter (DOM) is present in all natural waters and modulates</p><p>aquatic ecosystems by absorbing light and heat, and because it comprises a complex</p><p>mixture of organic molecules including amino acids, sugars, fulvic acids, and humic</p><p>material. DOM is derived from …
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The Analysis and Formation of Particulate Polycyclic Organic Matter
Made available in DSpace on 2014-12-13T20:10:37Z (GMT). No. of bitstreams: 1 7913639.pdf: 7916363 bytes, checksum: 5d1fd69f8341537d949316bc2973983c (MD5) Previous issue date: 1978
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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 definitive …
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Organic Matter Dynamics and Trophic Structure in Karst Groundwater
… had little effect on respiring cells. Dissolved organic carbon was more abundant at the base of the aquifer, probably because of patchy distribution of particulate organic matter in upper aquifer zones that leached dissolved organic carbon. The temporal sequence of flooding and drying in the …
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Molecular characterization of microbial interactions with labile dissolved organic matter
… 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
… 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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