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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 52 for “"microbial respiration"”.
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Kinetics of Microbial Respiration
… a thermodynamically consistent rate law for microbial respiration. Previous approaches to predicting the rate of microbial respiration have relied on empirical relations, such as the Monod and dual-Monod equations, which do not consider how energy available in cell's environment or the …
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Microbial respiration and precipitation of arsenic
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1998.
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Microbial respiration on decaying leaves and sticks along an elevational gradient of a southern Appalachian stream
Microbial respiration on sticks and leaves, measured as oxygen uptake rate, was compared among four (2nd-4th order) sites along an elevational gradient at Coweeta Hydrologic Laboratory, North Carolina. Rhododendron and birch leaves were placed in mesh bags in the stream at each site on 21 Oct 90. …
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Soil respiration, microbial respiration and mineralisation in soils of montane rainforests of Southern Ecuador: influence of altitude
… not been fully explained yet. As causes reduced microbial activity and nitrogen turnover in soils of tropical montane forests have been suggested. Against the background of climate change, carbon turnover mechanisms in soils of these forests are of special interest. The present study therefore …
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The influence of land use on the quality of seston in southern Appalachian stream ecosystems
… and organic content of seston, as well as microbial respiration of associated assemblages and growth rates of Chironomus tentans fed seston. There was more seston in streams draining less forested catchments but proportionally that material was less organic. Ultrafine particles dominated …
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Impacts of the Deepwater Horizon Oil Spill on Microbial-Mediated Cellulose Decomposition in Mississippi Gulf Coast Salt Marshes
… cellulose decomposition. In addition, rates of microbial respiration, fungal biomass (ergosterol) and nutrients (C:N, C:P) of surface sediment cotton strips were also quantified. Subsurface cotton strip decay, as determined by losses in tensile strength, were significantly different among marsh …
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Soil microbial function in a time of global change: effect of dairy antibiotics on soil microbial communities and ecosystem function
… for human health, the potential to disturb microbial communities and ecosystem functions they regulate is under appreciated. Antibiotics are commonly used in the livestock sector, accounting for 80% of antibiotic use domestically. This dissertation addresses three facets of this problem. …
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Mixing and Attenuation of Upwelling Groundwater Contaminants in the Hyporheic Zone
… depleted. Finally, mapping of two-dimensional microbial respiration (i.e., electron acceptor utilization) patterns in streambed sediments using dissolved oxygen and carbon dioxide planar optodes showed that coupling multiple such 2D chemical profiles can enhance understanding of microbial …
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To Mix or Not to Mix: Performance and Management of Diverse Cover Crop Mixtures
… rate, pH, electrical conductivity, soil respiration, earthworm counts, soil microbial respiration, and soil microbial biomass carbon (C) after three years of CC. Cover crop biomass production varied significantly each year (5633 kg ha-1 in year 1, 755 kg ha-1 in year 2, 5370 kg ha-1 in …
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Effects of grazing by the oligochaete, Aeolosoma, on detrital and periphytic assemblages
… Changes in algal community composition, microbial respiration, and structural indices (Chlorophyll a, protein, and carbohydrate) were measured in grazed and ungrazed cultures through time in 2 to 12 d experiments. Grazed cultures after 10 to 12 d had dissimilar algal community …
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Dynamics of cicrobial communities associated with <i>Typha angustifolia</i> (cattail) litter in a wetland ecosystem: Effects of litter manipulations on microbial decay processes
<p>Quantification of microbial processes involved in plant decomposition is important in understanding energy flow and nutrient recycling in wetlands. Prior studies examining emergent plant decomposition have often used litter that had been prematurely harvested (senescent) and/or manipulated …
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Effects of land use on oxygen uptake by microorganisms on fine benthic organic matter in two Appalachian mountain streams
… to determine the effects of land use patterns on microbial respiration. Both Coweeta Creek in western North Carolina, and Wolf Creek in western Virginia, flow through national forest, agricultural land and scattered residential areas. Seven sites were sampled at six to ten week intervals over one …
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The use of organic materials as amendments in the remediation of soils contaminated by lead, copper and zinc
… soil and plant metal availability as well as microbial respiration was used as an indication of effectiveness of metal immobilization. This was done by sorption studies, incubation experiments in contaminated media, and greenhouse pot experiments. Batch sorption studies were conducted to …
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Effects of invasion by the common reed (<i>phragmites australis</i>) on carbon transformations in a Great Lakes marsh
… of water level on soil microbes, and soil microbial response to leachate additions were investigated in<em> Phragmites</em> invaded and pre-invaded <em>Typha</em> sites. Less litter mass was lost from <em>Phragmites</em> than <em>Typha</em> in both sites during the initial 144 days. Annual …
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Oxygen Mass-Transfer in Tower Fermenters
… flow-rate, nutrient concentration, antifoams and microbial concentration on mass—transfer have been studied in detail: superficial air velocity and the presence of anti-foams are shown to be the most important factors. Measurements with the oxygen electrode have also been used to estimate …
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The Role and Contribution of Saprotrophic Fungi during Standing Litter Decomposition of Two Perennial Grass Species, <i>Schizachyrium scoparium</i> and <i>Schizachyrium tenerum</i>
… biomass produced enters the detrital pool, where microbial decomposers colonize, enzymatically degrade, and assimilate plant litter carbon and nutrients in amounts sufficient to bring about the decomposition of plant litter. Here, I estimated the biomass and production of fungi and microbial …
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Arsenic mobilization through bioreduction of iron oxide nanoparticles
… oxygen acts as the terminal electron acceptor in microbial respiration and Fe(III) (hydr)oxides are highly insoluble, thus arsenic remains associated with Fe(III) (hydr)oxide phases. However, under anaerobic conditions Fe(III)-reducing microorganisms can couple the reduction of solid phase Fe(III) …
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Physical and chemical controls on carbonate precipitation in surficial hot springs and subterranean cold springs
… and observed 813C values of calcite suggest microbial respiration may influence carbonate precipitation.
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A model-based approach for the development of a bioelectrochemical sensor for biochemical oxygen demand in wastewater
Bioelectrochemical systems such as microbial fuel cells and microbial electrolysis cells are currently being researched for many different environmental engineering applications. Some of these applications include wastewater treatment coupled with electricity generation, wastewater treatment …
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THE INFLUENCE OF THE INVASIVE CHINESE TALLOW (TRIADICA SEBIFERA) LEAF LITTER ON AQUATIC CHEMISTRY AND MICROBIAL COMMUNITY COMPOSITION
… suggest that Chinese tallow litter is promoting microbial activity through the rapid release of elemental nutrients, which subsequently influences a change in dissolved oxygen thorough stimulated microbial respiration. Changes in pH are not fully understood, but sterilization experiments suggest …
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