Results Search Electronic Theses and Dissertations (ETDs)

Virus dynamics, archaeal populations, and water chemistry of Three Acidic Hot Springs in Yellowstone National Park: Author: Snyder, Jamie Christine; Date: 2005-05-15; Program: Microbiology; Abstract: Few viruses from Archaea have been described and only a limited number have been characterized in molecular detail. Most hyperthermophilic viruses isolated from the archaeal sub-domain Crenarchaeota belong to the Sulfolobales family. We have focused on the isolation and analysis of viruses replicating in Sulfolobus. Sulfolobus is an acidophilic hyperthermophile that lives optimally at 80°C and pH 3. The SSVs (Sulfolobus spindle-shaped viruses) are the viruses most commonly isolated from thermal acidic areas around the world. SSVs are dsDNA spindle-shaped viruses with genomes of appr...; Download File | View full details

Retention of a Model Pathogen in a Porous Media Biofilm: Author: Bauman, Wesley James; Date: 2007-05-15; Program: Environmental Engineering; Abstract: The inadvertent or deliberate introduction of bacterial pathogens into drinking water systems can lead to serious public health consequences. As a result, rapid sampling opportunities within distribution systems are needed that can provide information on the source, species and fate of introduced pathogens. In this study, a porous media biofilm reactor was used to investigate the ability of an established mixed-species drinking water biofilm to immobilize cyan-labeled Escherichia coli 0157:H7 as a model pathogen. Test reactors were colonized with biofilm for two or three weeks at 0.5 mg/l C, r...; Download File | View full details

Biology of acid-sulfate-chloride springs in Yellowstone National Park, Wyoming, United States of America: Author: Boyd, Eric Stephen; Date: 2007-08-15; Program: Microbiology; Abstract: This dissertation investigated the role of biology in several biogeochemical cycles in acid sulfate chloride (ASC) geothermal springs in Yellowstone National Park (YNP). Elemental sulfur (S°) is associated with many geothermal springs, yet little is known about the organisms involved in its cycling. The aqueous and solid phase geochemistry near the source of Dragon Spring, an ASC spring in the Norris Geyser Basin (NGB) of YNP, was used to guide the enrichment and isolation of two novel S°-reducing Crenarchaeota affiliated with the order Desulfurococcales. Both isolates ar...; Download File | View full details