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 156 for “"Microcosms"”.
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Effects of copper on benthic communities in artificial microcosms
… ecological parameters in artificial streams and microcosms. Effects investigated were colonization and growth of periphyton communities in artificial streams, community composition and nutritional content of periphyton in these streams, leaf conditioning and nutritional content in laboratory …
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Survival and recovery characteristics of Arcobacter butzleri in groundwater microcosms
Arcobacter butzleri may be an etiological agent of gastroenteritis. However, relatively little is known about the persistence and ecology of this genus, particularly in groundwater. In laboratory studies it was determined that the survival of A. butzleri in groundwater can exceed that of the …
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Decoding Gentrification. An operative study through the microcosms of Istanbul
L'abstract è presente nell'allegato / the abstract is in the attachment
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Unamunian Microcosms: Four Short Stories in a New Translation into English
<p>Spanish writer Miguel de Unamuno's short fiction is neglected in both the academic and nonacademic communities, and it is especially underrepresented in English-language translation. This thesis constitutes a comprehensive approach to four short stories: "El que se enterró," "La manchita de la …
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Microcosms and field bioremediation studies of Perchloroethene (PCE) contaminated soil and groundwater
… (c-DCE) accumulated in the sample. Bioaugmented microcosms containing YE and SOME created reducing conditions for KB-1 culture, resulting in ~ 90% dechlorination of PCE to methane and c-DCE. Cheese whey microcosms containing 0.05% cheese whey inhibited the KB-1 culture. This inhibition was due to …
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Walking On The World: Landscape And Geographic Microcosms In Roman Floor Mosaics
… relatively small interiors, making their rooms microcosms of the world out there. I explore case studies organized thematically, compiling mosaics depicting water, land, map-like depictions, allegorical representations of space, and finally combinations of those types in a single Sicilian villa. …
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Biodegradation of tertiary butyl alcohol by an introduced Pseudomonas sp. in subsurface soil microcosms
… of the Fredrick clay metabolized TBA in soil microcosms that contained 10 to 500 mg/liter TBA. The addition of Pseudomonas sp., VT100, to the Fredrick clay enhanced the rate of TBA degradation in the l0 and 500 mg/liter TBA treatments, and reduced the time required for the initiation of TBA …
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The use of microcosms to assess the potential impact of underground bunker crude oil on freshwater aquatic organisms
… pans. Controlled laboratory conditions, indoor microcosms were being used for this purpose. Artificial sediments of the experimental microcosms were weighed (450 g per chamber) and washed three times with Milli-Q® deionized water before the sediment was spiked with four concentrations of crude …
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A statistical approach to understanding microcosm methods for microbially mediated dechlorination of trichloroethene in bedrock aquifers
<p>Microcosms were evaluated using statistical methods to advance the measurement and characterization abilities for in situ reductive dechlorination of trichloroethene (TCE) in fractured rock aquifers. Microcosms constructed with unincubated crushed rock in groundwater provided the best microcosm …
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Bioremediation of Pcb Contaminated Surface Soil: A Microcosm Study
… surface soil was evaluated using serum bottle microcosms containing aceticlastic methanogenic consortium, enriched from a municipal anaerobic digester. Two different experiments, "intermediate feed" and "starve and feed" were conducted by manipulating the methanogenic consortium with different …
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Effects of surfactants on the biodegradation of toluene in soil
… of toluene in the subsurface. Soil microcosms containing gasoline were used to simulate conditions of an aquifer contaminated with hydrocarbons. The surfactants were the nonionics, Surfonic N-40 and N-95. Three volumes of gasoline, 0.005, 0.05, and 0.1 mL, were injected into separate …
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The Feasibility of Bioaugmentation for the Remediation of Chlorinated Solvents: A Microcosm Study
… threat to ecological health. In this study, microcosms were used to test the viability of bioaugmentation as a possible remediation strategy at a PCE contaminated site at the Naval Amphibious Base at Little Creek located in Virginia Beach, Virginia. All microcosms were created in duplicate …
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Evaluation of Enhanced Bioremediation for Reductive Dechlorination of Tetrachloroethene (PCE): Microcosm Study
… Little Creek. Previous work with laboratory microcosms conducted under simulated natural (unamended) conditions has demonstrated that indigenous dehalorespirators were capable of partial dechlorination of tetrachloroethene (PCE) to cis-dichloroethene (cis-DCE). This study attempts to achieve …
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Enhancement of biodegradation of methanol and tertiary butyl alcohol in groundwater systems
… much greater than the TBA rate. By using sets of microcosms, several chemical additives were used in an effort to determine their effects on biodegradation. Organic substrates were added to microcosms containing low concentrations of TBA (about 1 mg/L) without evidence of stimulation or …
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The biodegradation of valeric, butyric, propionic and acetic acids in anoxic, subsurface, soil environments
… of short-chain fatty acids in anaerobic soil microcosms. Valerate, butyrate, propionate, and acetate concentrations were monitored independently using separate microcosms. The effect of sulfate on the microbial communities was also investigated. One soil, from Newport News, Virginia, consisted …
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Adaptation and niche construction by Pseudomonas fluorescens SBW25
… populations in liquid cultures, referred to as microcosms. Evolving populations of <i>Pseudomonas fluorescens</i> SBW25 in static microcosms reproducibly lead to the emergence of the Wrinkly Spreader (WS) genotype. These produce a cellulose-matrix-based biofilm to colonise the airliquid (A-L) …
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The microbial immobilization of zinc sulfate
… Zn in aquatic systems. Static three-phase microcosms were designed to simulate certain characteristics of natural systems in the laboratory. Microcosms (40, 15, 15 cm in length, width and height, respectively) contained water and sediments collected from a stream which had received …
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Multispecies toxicity tests using indigenous organisms: predicting the effects of hazardous materials in streams
… and periphyton communities in laboratory stream microcosms could be used to predict macroinvertebrate and periphyton responses In a natural stream receiving the same contaminant. The microcosms were dosed in quadruplicate with four (0.0, 0.1, 1.0, and 10.0%) concentrations of a complex effluent; …
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Environment risk assessment for toxic chemicals and genetically-engineered microorganisms: a microcosm approach
Microcosms were used in this research to assess the environmental risk associated with two types of stressors: genetically-engineered microorganisms (GEMs) and toxic chemicals. Approaches used to evaluate the potential environmental impact of these two stressors are fundamentally different, and …
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