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 26 for “"Nitrifying bacteria"”.
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Responses of Nitrifying Bacteria to Aquaculture Chemotherapeutic Agents
… were analyzed for their impacts to the nitrifying bacteria in aquaculture systems. It was found that three of the chemotherapeutants: oxytetracycline, Romet-30®, and chelated copper caused inhibition to the nitrifying bacteria at the whole cell level as demonstrated in the results from …
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Development of Kinetic Parameterization Methods for Nitrifying Bacteria using Respirometry
… coefficients for both ammonia oxidizing bacteria (AOB) and nitrite oxidizing bacteria (NOB) without the use of selective inhibitors. By eliminating the use of inhibitory substances, representative biomass characteristics were maintained throughout the tests. The developed method, called …
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Detection and quantification of nitrifying bacteria from South African biological nutrient removal plants
Submitted in fulfilment for the requirements for the Degree of Doctor of Technology: Biotechnology, Durban University of Technology, Durban, South Africa, 2013.
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The Effect of Chlorine and Chloramines on the Viability and Activity of Nitrifying Bacteria
… little is known about the stress responses of nitrifying bacteria to different disinfection strategies and the role physiological state plays in the resistance to disinfection. It is well known that many commonly studied bacteria, such as Escherichia coli, are able to better resist disinfection …
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A study of nitrification in lakes of the English Lake District
… to the activity of planktonic chemolithotrophic nitrifying bacteria. The observed nitrate concentration increased during this phase and accounted for up to 15% of the total oxygen deficit of the hypolimnion. At similar in situ temperatures nitrification rates and nitrifying bacterial populations …
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Carbon and Nitrogen Dynamics in High Intensity Minimal Exchange Shrimp (<i>Litopenaeus vannamei</i>) Raceways
… (4) determine if plastic media allowed for a nitrifying bacteria population to establish more rapidly, (5) determine if the two solids treatments had any effects on water quality parameters and shrimp production, and (6) run a stable isotope mixing model. Once a week, one liter of water was …
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Stream microbial communities along an agricultural gradient
… how does it affect the abundance of nitrifying bacteria? Water and sediment samples were collected from ten locations along the watershed in spring and fall 2012. Two PCR techniques were used on the extracted sediment and pore-water DNA: terminal restriction fragment length …
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The effects of atrazine on nitrogen cycling in a freshwater wetland microcosm
… will disrupt 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 …
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Low temperature biological treatment of a high ammonia municipal landfill leachate
… oxygen (more than 1.8 mg/l) was supplied to the nitrifying bacteria. The leachate feed was controlled at 10 liters per day. The settled sludge in the clarifier was returned to the anoxic reactor at a recycle ratio of 6:1 (60 l/d). Methanol was used as an external carbon source for …
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Chemical Inhibition of Nitrification: Evaluating Methods to Detect and Characterize Inhibition and the Role of Selected Stress Responses Upon Exposure to Oxidative and Hydrophobic Toxins
… that the more severe inhibition was because nitrifying bacteria lack one or more of the microbial stress response mechanisms used to mediate the toxic effect of oxidative chemicals. During these experiments, we showed that a rapid (minutes) antioxidant potassium efflux mechanism does not …
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The effect of simazine on nitrification and the decomposition of simazine by soil microorganisms
… nitrification in pure and mixed cultures of the nitrifying bacteria. Simazine concentrations of 6 and 9ppm inhibited the rate of nitrification in soil perfusion units, and an abnormally high level of nitrite nitrogen was observed in the herbicide treatments. The herbicide had no effect on the …
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An ecological study of waste stabilization ponds in Werribee, Australia, with special reference to nutrient and plankton dynamics
… degradation and nitrification by aerobic and nitrifying bacteria respectively. In the pond series at Werribee, ammonia in the raw sewage was completely removed through nitrification as well as algal cell uptake during periods of longest detention time. On the other hand, removal of phosphorus …
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Effect of silver nanoparticles on planktonic and biofilm cell growth
… on planktonic (e.g., free swimming) and biofilm bacteria that are relevant to wastewater treatment and the natural environment. Nitrifying bacteria and E. coli were used as model microorganisms because they are essential in nitrification processes and a good water quality indicator in the …
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The role of denitrification in the nitrogen cycle of New England salt marshes
… was used to study competition between plants and nitrifying bacteria for remineralized ammonium. In undisturbed sediments of Spartina alterniflora, plant uptake out-competed nitrification-denitrification, with plant uptake accounting for 66% of remineralized ammonium during the growing season. …
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Studies on the aerobic bacterial flora of a New Zealand tussock grassland soil
… parts. All are concerned with the aerobic bacterial flora of a single New Zealand grassland soil whose characteristics are described. The 4 parts deal respectively with the characterisation of the aerobic heterotrophic bacterial flora, the activity this flora as measured by a number of …
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Sources And Controls Of Reactive Nitrogen Gas Emissions From A Mojave Desert Ecosystem
… is stimulated leading to NO production by nitrifying bacteria. Results indicate that biological sources of NO and NH3 efflux respond primarily to the addition of water; however, fluxes are modulated by temperature and nutrient constraints on microbial activity. Chapter two explores the role …
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Application of bioaugmentation to improve nitrification at the Gammams Wastewater Treatment Plant
… study were firstly to isolate and identify the nitrifying bacteria in the activated sludge system. Secondly, it was to test the inhibition capabilities of three test chemicals and thirdly to test the percentage recovery attainable by bioremediation using a fresh sample of activated sludge and by …
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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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Relationship Between Organic Carbon and Opportunistic Pathogens in Simulated Premise Plumbing Systems
… in control of heterotrophic and coliform bacteria re-growth in water distribution systems via disinfection, control of assimilable organic carbon (AOC), and biologically degradable organic carbon (BDOC). However, much little is known about the effect of AOC on the proliferation of …
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The production and fate of nitrogen species in deep-sea hydrothermal environments
Nitrogen (N) species in hydrothermal vent fluids serve as both a nutrient and energy source for the chemosynthetic ecosystems surrounding deep-sea vents. While numerous pathways have been identified in which N-species can be produced and consumed in the context of submarine hydrothermal vent …
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