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 68 for “"microbial degradation"”.
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Microbial degradation of polyester polyurethane
… Vinyzene E.P. reduced the rate and extent of degradation in test material exposed to soil conditions, but was found to be ineffective in preventing degradation when exposed to the marine environment. As a result of these studies, a number of fungi, representing a range of genera, have been …
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Microbial degradation of high molecular weight polycyclic aromatic hydrocarbons
The bacterial degradation of high molecular weight PAHs was investigated by isolating communities and individual strains from a PAH-contaminated site. Microbiological analysis of soils from Port Melbourne, Australia, resulted in the enrichment of five microbial communities capable of degrading …
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Microbial Degradation of Acetaldehyde in Freshwater, Estuarine and Marine Environments
… environments is thought to be under significant microbial control, yet the identity and diversity of microbial acetaldehyde degraders, and the mechanisms of acetaldehyde degradation, are largely unknown. In this thesis, the key acetaldehyde-degrading microorganisms in the Colne Estuary, the River …
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Microbial degradation of selected aromatic compounds in a hazardous waste site
Microbial degradation of five aromatic compounds was followed in aseptically-taken subsurface soil samples and ground water samples from the vicinity of a pit used to dispose the waste from a wood creosoting plant. The five compounds--anthracene, dibenzofuran, fluorene, naphthalene, and …
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Monitoring, characterizing, and preventing microbial degradation of ignitable liquids on soil
… is to preserve ignitable liquid residues against microbial degradation as efficiently and quickly as possible. Field and laboratory studies were conducted to monitor microbial degradation of gasoline and other ignitable liquids in soil samples. In addition to monitoring degradation in potting …
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Formation of authigenic minerals during microbial degradation in artificial marine media
I have conducted incubation experiments exploring microbial degradation of organic matter within an artificial sediment designed to simulate an organic-rich siliciclastic marine sediment. Central questions to my research include: 1) How does the presence of dissolved iron influence the degradation …
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Marine particle dynamics : sinking velocities, size distributions, fluxes, and microbial degradation rates
… the detection limit of the instruments. The high microbial respiration rates and slow sinking velocities in the Sargasso Sea resulted in the strong attenuation of the flux with respect to depth, whereas the rapid sinking velocities and slow microbial degradation rates of the WAP resulted in nearly …
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Marine particle dynamics : sinking velocities, size distributions, fluxes, and microbial degradation rates
… the detection limit of the instruments. The high microbial respiration rates and slow sinking velocities in the Sargasso Sea resulted in the strong attenuation of the flux with respect to depth, whereas the rapid sinking velocities and slow microbial degradation rates of the WAP resulted in nearly …
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Quantitative Assessment of the effects of Microbial Degradation of a Simple Hydrocarbon Mixture
… soil-containing fire debris evidence, chemical degradation from microorganisms is observed to result in the loss of compounds based on chemical structure. It can also happen when the evidence container is stored at room temperature before analysis. This can present a challenge to the fire debris …
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Effects of Alkaline Hydrogen-Peroxide Treatment of Crop Residues on Cell Wall Carbohydrate Utilization by Ruminants (Lignocellulose)
… animal feedstuff if factors limiting its microbial degradation in the ruminant's gastrointestinal tract could be removed by chemical treatment. Treating lignocellulosic materials with an alkaline (pH 11.5) solution of hydrogen peroxide (.26 g hydrogen peroxide per g lignocellulosic …
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Marsh-Exported Dissolved Organic Matter Fate in Estuaries
… to their high productivity and low soil carbon degradation rates, laterally they are sources of carbon as optically and chemically distinct DOM to surrounding aquatic ecosystems; these inputs are often essential in sustaining a net heterotrophic system. However, the photoreactivity and …
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Microbial Degradability of Terrigenous, Marsh-Exported, and Estuarine Colored Dissolved Organic Matter in Long Island Sound
… however spatial and temporal dynamics in the microbial availability of DOM derived from different sources in estuarine systems are not well characterized. Because of this, understanding the sources and properties of dissolved organic materials coming into Long Island Sound, and their …
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Effect of organic matter and contact time on the sorption and bioavailability of chlorophenols
… long-term contamination of groundwater supplies. Microbial degradation of these compounds may also play an important role in their environmental fate. The purpose of this study was to investigate how the processes of sorption, desorption, and biodegradation interact to affect the distribution of …
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Molecular characterization and effect of diagenesis and maturation of melanin in the fossil record
… biomolecules like chitin that are resistant to microbial degradation and diagenetic alteration thereby affording melanins the potential to maintain their integrity for millions of years. Color patterns depend on pigment composition and arrangement. Recent studies have demonstrated that melanin …
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Phytoremediation Mechanisms of a Creosote-Contaminated Site
… hybrid poplar tree phytoremediation system and microbial degradation, (3) assess the effects of the grass phytoremediation system on surface soil remediation, and (4) determine the mechanisms of surface soil remediation resulting from the grass phytoremediation system.
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Fermentable Carbohydrate Substrates Generated from Cereal and Pseudocereal Insoluble Dietary Fibers and Their In Vitro Fecal Fermentation
… effort to make these fibers more susceptible to microbial degradation and a resulting improved fermentability. Insoluble dietary fibers from four alternative grains, sorghum and pearl millet of African origin, and quinoa and amaranth of Andean origin, were subjected to a combination of microwave …
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Bioavailability of sediment-sorbed fluorene
… Studies presented herein investigate the biodegradation and desorption of fluorene, a 3 ringed polynuclear aromatic hydrocarbon (PAH), in estuarine sediment-water slurries. Adsorption of fluorene to sediments with 1.4% organic carbon was characterized with a linear isotherm. Desorption was …
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Evaluating the Metal Tolerance Capacity of Oil Sands Tailings Microbes, and their Ability to Degrade Naphthenic Acids While Attached to Biochar
… evaluate the metal tolerances of a native OSPW microbial community, and the effect of OSPW-specific metals on their ability to degrade NAs. Furthermore, this work focused on enhancing OSPW treatment by growing these NA-degrading communities on an engineered adsorbent, biochar, under the …
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