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 23 for “"Soil And Sediment"”.
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A common and previously unknown ecological niche: the halorespiration of natural organochlorines in terrestrial soil and sediment
… such as polychlorinated biphenyls and trichloroethene, as their terminal electron acceptors and are called halorespirers. While the distribution and role of halorespiring <italic>Chloroflexi</italic>, as well as halorespirers in other phyla such as the <italic>Firmicutes</italic>, …
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Anaerobic Dissipation of Herbicides in Microbiologically Induced Soil Redox Regimes
… may encounter anaerobiosis as a result of soil flooding, poor drainage, or offsite transport. Anaerobic dissipation of herbicides in the environment is poorly understood. The objective of this research was to characterize the anaerobic fates of herbicides atrazine, trifluralin, and …
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Determination of actinide elements in environmental samples by ICP-MS
… of the actinide elements in water, biological, soil and sediment samples have been developed using on-line solid phase extraction and high performance liquid chromatography (HPLC) coupled with inductively coupled plasma mass spectrometry (ICP-MS). Initial applications utilised a commercially …
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Speciation of Mercury by Chromatography Coupled with Atomic Spectrometry
A commercial GC-AFS instrument has been developed and optimised for the speciation of organomercury. This instrument couples a GC oven to a modified atomic fluorescence detector via a ceramic pyrolyser. Organomercury compounds in dichloromethane solvent were directly injected through a Programmable …
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Soil as a possible origin of organisms of the Mycobacterium avium, M. intracellulare, and M. scrofulaceum (Mais) complex in southeastern United States
Water and soil samples collected from the mouth to origin of the Savannah and Tombigbee Rivers were treated for enumeration of organisms of the Mycobacterium avium, M. intracellulare, and M. scrofulaceum (MAIS) complex. Their numbers in soil and water were compared to physiochemical characteristics …
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Geomycology: fungal bioweathering, bioleaching, bioprecipitation and biotransformation of metals and minerals
… particularly element biotransformations and biogeochemical cycling, metal and mineral transformations, decomposition, bioweathering, and soil and sediment formation. Fungi can apply various mechanisms to effect changes in metal speciation, toxicity and mobility, mineral formation and/or …
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Monitoring pesticides in the soil, groundwater, and submarine groundwater discharge of the Chesapeake Bay Area
… shallow groundwater beneath agricultural sites, and if so, to determine a correlation between soil and groundwater pesticide concentrations. The second was to examine the correlation between pesticide concentrations measured by gas chromatography with electron capture detector (GC/ECD) and an …
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The environmental behaviour of beryllium-7 and implications for its use as a sediment tracer
The use of cosmogenic beryllium-7 (7Be) as a soil and sediment tracer relies upon a number of important assumptions which to date have not been fully underpinned by supporting data. As a catchment management tool 7Be offers unique potential to assess the effects of recent land use or climate change …
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Microbial Mat Abundance and Activity in the McMurdo Dry Valleys, Antarctica
… productivity is a fundamental ecological process and an important measure of ecosystem response to environmental change. Currently, there is a considerable lapse in our understanding of primary productivity in hot and cold deserts, due to the difficulty of measuring production in cryptogam …
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Application of P-wave Reflection Imaging to Unknown Bridge Foundations and Comparison with Other Non-Destructive Test Methods
… failures. Scour occurs due to the erosion of soil and sediment within a channel with flowing water. During a flood event, the extent of scour can be so great that it can destabilize an existing bridge structure. In order to evaluate the scour potential of a bridge, it is necessary to have …
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A geochemical investigation of the water and sediments of Barber's Pan, North West Province
… a large proportion of southern African wetlands and yet remain poorly classified. Very little data is available on the aqueous chemistry of southern African saline systems, and with the exception of a few publications dealing, in part, with the soil and associated materials of pan floors and …
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Investigation of Lead Hydrolytic Polymerization and Interactions with Organic Ligands in the Soil/Sediment-Water Environment
… was to investigate lead speciation in the soil/sediment-water environment and to better understand how the species affect lead mobility under different environmental conditions. The research involved both field soil and sediment samples as well as standard lead solutions. Field samples were …
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The catalytic role of birnessite in the Maillard reaction and the abiotic formation of humic substances
Humic substances are ubiquitous in soils and sediments and because of their agricultural and environmental importance have been the subject of much research. The Maillard (browning) reaction involving the polycondensation of carbohydrates and amino acids has been postulated as being an important …
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Characterization of Extremophilic Bacteria for Potential in the Biofuel and Bioprocess Industries
… for harsh bioprocess conditions. Over 500 soil and sediment samples collected from 77 saline and/or thermal sites in the continental United States, Hawaii, and Puerto Rico were used to inoculate fermentations in an effort to optimize the microbial communities for a biofuel process developed …
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Ecological Community Changes and Ecosystem Functioning During Structured Wetland Development
… grazing for livestock, resources for birds and breeding grounds for fish. After a long history of saltmarsh reclamation there is now emphasis on restoration of existing or destroyed saltmarshes to provide dynamic coastal defences providing ecosystem services. The engineering technique of …
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Environmental mineralogy of gold recovery from refractory gold-arsenic-bearing Bakyrchik concentrates
… minerals. In the case of gold ores, the mining and beneficiation may also produce As-bearing wastes and this can accelerate the natural mechanisms of As mobilization. The Bakyrchik is the largest gold deposit in Kazakhstan and one of the largest in the world. Gold (Au) is dispersed in pyrite and …
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Impact Of Timber Harvest On Mercury Mobilization In A Mixed Pine And Hardwood Forest And Adjacent Lake In Mississippi
With 65% of land area covered in forest, Mississippi is a leader in the timber industry. Whereas forestry provides numerous benefits for humans and wildlife, forest harvest has been hypothesized to increase mercury (Hg) mobilization to aquatic systems. In a forest, Hg mostly accumulates in the …
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Valuing ecosystem services in a green economy
SCOPE: Ecosystems are being degraded and destroyed worldwide at a rate unprecedented in human history. Accordingly a great deal of interest is currently being focussed on ecosystems, the role they play in planetary life support, and the need for a market mechanism to conserve these formerly …
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Fate of 17α-Estradiol, 17β-Estradiol, and Estrone in Agricultural Soils and Sediments
… to concentrated animal production facilities and increasing rural-urban migration has increased the localized land application of nearly 1 billion tons of manure and biosolids annually. Although these applications provide nutrients and contribute to soil tilth, they also serve as a source for …
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Influence of natural organic matter on the mobility of arsenic in aquatic systems, soils and sediments
… one of the most dangerous inorganic contaminants and threats for the world’s water resources. Arsenic is ubiquitious in the earth crust and humans are especially affected through As polluted drinking water supplies. The occurrence of high As groundwater concentrations is often caused by geogenic …
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