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.
Results
Showing 1 to 7 of 7 for “"Microbial sulfate reduction"”.
-
Physiology of multiple sulfur isotope fractionation during microbial sulfate reduction
Microbial sulfate reduction (MSR) utilizes sulfate as an electron acceptor and produces sulfide that is depleted in heavy isotopes of sulfur relative to starting sulfate. The fractionation of S-isotopes is commonly used to trace the biogeochemical cycling of sulfur in nature, but a mechanistic …
-
Bioremediation of Effluent Water in a Coal Ash Disposal Area: Optimizing Microbial Sulfate Reduction
… This study focuses on the issue of elevated sulfate concentrations at the Martin Lake Steam Electric Station (MLSES) A-I Disposal Area in Panola County, Texas, where CCR are disposed of in a permanent landfill. Currently, this site is exceeding its regulatory limit of sulfate concentrations …
-
A revised monod-type rate law predicting variable sulfur isotope fractionation factors as a function of microbial sulfate reduction rate
Microbial sulfate reduction is associated with characteristic sulfur isotope partitioning, which can serve as a proxy for the rate of this reactivity in a wide variety of reducing environments. We demonstrate a new model for this functional relationship through the use of a modified Monod-type rate …
-
The effect of carbon addition, pH and Fe concentration of microbial sulfate reduction and the subsequent precipitation of Fe and Mn from acid mine drainage in wetland mesocosms
… total Fe, 3 mg/L total Mn and 450 mg/L dissolved sulfate. An 18 month field study of water quality improvement and sulfate-reducing bacterial (SRB) populations revealed that the wetland was effectively treating the AMD. Iron and Mn both met compliance standards set by the EPA requiring an instream …
-
The formation of carbonate minerals in laboratory and environmental settings
Microbial sulfate reduction, couple to organic matter oxidation or methane oxidation, is one of the key processes driving the formation of sedimentary carbonate minerals. While some work has been done exploring the formation of carbonate minerals via microbial sulfate reduction, less attention has …
-
Early evolution of environments and metabolism: insights from nitrogen, selenium and sulfur isotopes
… mudrocks support an early Archean origin of microbial sulfate reduction and late Archean enhancement of biological pyrite oxidation on land, leading to increasing fluxes of sulfate and other nutrients to the ocean. In the third part (Chapters 4-7), I further test this hypothesis through …
-
Expression of dsr messenger RNA by sulfate reducing bacteria with varying substrate and temperature
… the possibility of estimating the activity of sulfate reducing bacteria by measuring the number of messenger RNA (mRNA) transcripts of dsr, a critical gene in the sulfate reduction pathway, in a cell. Because conditions in aquifers can be quite different from those maintained in laboratory …