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 24 for “"denitrifying bacteria"”.
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Anaerobic transformations of Kepone by denitrifying bacteria
Anaerobic bacteria isolated from Kepone-contaminated sediment were screened for their ability to degrade Kepone under anaerobic conditions. The most extensive degradation was produced by denitrifying bacteria grown on benzoate-nitrate medium. In enrichment cultures, Kepone was transformed more …
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Anaerobic degradation of steroid hormones by novel denitrifying bacteria
… process. However, nothing is known about the bacteria responsible for this estradiol degradation. Also no information exists about the degradation of testosterone under anoxic conditions. This work gives first data about the anaerobic degradation of both estradiol or testosterone by novel …
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Structural and Functional Microbial Ecology of Denitrifying Bacteria Using Different Organic Carbon Sources
… the link between the structure and function of denitrifying microbial populations grown on different carbon sources. Specific objectives were to: 1) diagnose bacteria specifically assimilating methanol and ethanol and determine denitrification kinetics induced by the two carbon sources; 2) …
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Denitrification in a best management practice bioretention system
This study investigates the occurrence of denitrifying soil bacteria in a bioretention system located in Singapore and containing a saturated anoxic zone intended to facilitate denitrification. Soil samples were collected from six depths within the rain garden, four of which were within the …
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Factors Affecting Denitrification Potential and the Microbial Ecology of Established Bioretention Cells Across the Eastern Mid-Atlantic Region
… NC, and quantified patterns in populations of denitrifying bacteria, denitrification potential, and microbial community structure within the soil medium. We found the greatest denitrifier populations and denitrification potential in the upper layer of the soil medium, which does not coincide …
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The effects of atrazine on nitrogen cycling in a freshwater wetland microcosm
… the nitrogen cycle by inhibiting nitrifying and denitrifying bacteria. The inhibition or absence of functional groups of bacteria will limit the ability of the wetland to remove nutrients and herbicides, thus increasing nitrogen levels in non-point source pollution. All tests were conducted in …
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Microbial community dynamics in denitrifying biofilters receiving agricultural drainage
… of nitrate entering surface waters is the denitrifying biofilter. A typical denitrifying biofilter consists of a woodchip-filled trench inline with the drainage tile; woodchips provide a carbon substrate to the microorganisms that convert nitrate to nitrogen gas through the denitrification …
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Investigation of a Commercial Product (BiOWiSH™) for Nitrogen Management
… conditions for both ammonia assimilating and denitrifying bacteria are an anoxic environment with a carbon-to-nitrogen ratio of 2:1. Under this optimal growth environment, Biowish–Aqua was able to assimilate ammonia with a zero order k value of 3.06 ppm/day. Also, under the same conditions, …
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Magneto-optical studies of RirA and cytochrome cd1
Rhizobia are members of the Gram-negative α-proteobacteria. Rhizobium leguminosarum controls genes involved in iron uptake through repression under conditions of iron sufficiency. This part of iron regulation is co-ordinated by the dimeric rhizobial iron regulator, RirA. The sequence of RirA …
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Nitrification process in integrated fixed-film activated sludge (IFFAS) system
… typically involving the use of ammonia oxidizing bacteria (AOB), nitrite oxidizing bacteria (NOB), and denitrifying bacteria (DEN). This study looked at alternative nitrification processes, including anaerobic ammonia oxidiation (anammox) reactions that may be innately present in an integrated …
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Magneto-optical spectroscopic studies of multi-heme enzymes
… diheme enzyme located in the periplasm of denitrifying bacteria that catalyses the one-electron reduction of nitrite ion to nitric oxide. Paracoccus pantotrophus cd1 undergoes an unusual coordinated ligand switch upon reduction to the diferrous state, whereby a distal tyrosine ligand …
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Magneto-optical spectroscopic studies of multi-heme enzymes
… diheme enzyme located in the periplasm of denitrifying bacteria that catalyses the one-electron reduction of nitrite ion to nitric oxide. Paracoccus pantotrophus cd1 undergoes an unusual coordinated ligand switch upon reduction to the diferrous state, whereby a distal tyrosine ligand …
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Abiotic nitrate reduction by redox activated iron-bearing smectites
… redox interface of the soil profile. A lack of denitrifying bacteria in the studied profiles points to an abiotic source of nitrate reduction that likely involves mineral phases containing iron. The ability of reduced, iron-bearing clay minerals to in turn reduce nitrate was investigated using …
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Facultative Bioreactor Landfill: An Environmental and Geotechnical Study
… an on-site treatment plant and converted by denitrifying bacteria to nitrogen gas, a harmless end-product. In this research, three pilot-plant scale lysimeters are used in a comparative evaluation of the effect of recirculating treated and untreated leachate on waste stabilization rates. The …
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Denitrification Under Salinity Stress in Biofilm Reactors
… of methanol-driven and thiosulphate-driven denitrifying bacteria from non-saline sources for the treatment of saline wastewaters. Also, their denitrification performance in fluidised bed biofilm reactors (FBBR) and in moving bed biofilm reactors (MBBR) were studied, optimizing the process …
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Characterization of the quinol nitric oxide reductase from Peresephonella marina
… characterized the qNOR from the thermophilic, denitrifying bacteria Persephonella marina. The reaction rate of this qNOR varied linearly from 0.22±0.05 at 42°C to 2.3±0.3 at 60°C. We also report the first Km for a purified qNOR, and first activation energy of any NOR, 3.1±0.6 μM NO and 114 …
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Denitrification in the Elk Valley aquifer, northeastern North Dakota
… concentrations below 1 mg/Lin the deeper wells. Denitrifying bacteria were found to be present throughout the aquifer. </p><p> Intermittent pumping of an irrigation well was found to affect groundwater flow and the vertical displacement of contaminants. Numerical modeling of particle movement …
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Variations in the biodegradation potential of subsurface environments for organic contaminants
… rates were positively correlated with bacterial density for 12 soil samples from 3 sites within a localized area at Blacksburg, Virginia. However, this relationship did not exist between soils from diverse locations. The prevailing electron acceptor conditions govern the catabolic …
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Evaluation of Digital PCR (dPCR) for the Quantification of Soil Nitrogen Turnover Bacteria in Wetland Mesocosms in Response to Season, Fertilization, and Plant Species Richness
… system was used to quantify ammonia-oxidizing bacteria (AOB), nitrite-oxidizing bacteria (NOB), comammox, anammox, and denitrifiers. Principal component analysis (PCA) was used to identify dominant patterns in the microbial community and nitrogen species. Resampling-based analysis of variance …
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Microbial Oxidation of Arsenite in Anoxic Environments: Impacts on Arsenic Mobility
… microorganisms such as chemolithotrophic denitrifying bacteria and chlorate respiring bacteria in the biogeochemical cycle of arsenic. This study also investigated a arsenic potential bioremediation strategy based on injecting nitrate or chlorate into contaminated groundwater and surface …
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