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 9 of 9 for “"Ammonia oxidizers"”.
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The biogeochemistry of marine nitrous oxide
… and the ocean. Nitrification, and particularly ammonia oxidation, is one of the major processes that produces N2O in the ocean. In this thesis, a series of stable isotopic methods have been used to characterize the biogeochemical controls on N2O production by marine nitrification as well as the …
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The biogeochemistry of marine nitrous oxide
… and the ocean. Nitrification, and particularly ammonia oxidation, is one of the major processes that produces N₂O in the ocean. In this thesis, a series of stable isotopic methods have been used to characterize the biogeochemical controls on N₂O production by marine nitrification as well as the …
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Environmental controls on the abundance, diversity, growth, and activity of ammonia-oxidizing microorganisms in temperate forest soils
… was to investigate the structure and function of ammonia-oxidizing microbial communities in temperate forest soils. Accomplishing this goal required a hybrid approach: I used modern molecular biology techniques alongside soil biogeochemical measurements and framed my research using ecological …
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Nitrification inhibitors have minimal impact on microbial and Collembola communities in Danish arable soil
… sequencing. Our results revealed that neither ammonia-oxidizing microorganisms nor non-target bacterial and fungal communities, as well as collembola, were not significantly affected by short-term NI application, even at tenfold dosages than recommended. However, the choice of …
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Fate and effect of alkyl benzyl dimethyl ammonium chloride in mixed aerobic and nitrifying cultures
… were observed. Nitrification of the produced ammonia was complete at an AB concentration of 20 mg/L after an acclimation period, but was almost completely inhibited at 50 mg/L. Mixed aerobic cultures maintained only with AB as external nitrogen and carbon source achieved a high degree of AB …
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Investigation of Factors Influencing Niche Differentiation of Ammonia-oxidizing Archaea and Bacteria in Freshwater Environments
… of nitrogen from its most reduced form (ammonia) to its most oxidized form (nitrate) is a component of the nitrogen cycle in aquatic habitats. The first step of this process, the oxidation of ammonia to nitrite, is performed by two distinct groups of microorganisms in the environment, the …
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The effect of ammonial loading, solids retention time and operating temperature on the biological nitrification and denitrification of high ammonia landfill leachate
The effect of ammonia loading, solids retention time and operating temperature (20, 17, 14, 12 and 10 °C) on the treatment of high ammonia landfill leachate (200, 300, 600, 1000, 1500 and 2000 mg NH4-N/L), was investigated. Two biological, single-sludge, nitrification-predenitrification systems …
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Variations in the Oxidative Rates of Nitrosomonas europaea in Coke-Plant Activated Sludge.
… such as those containing high levels of ammonia, has resulted in toxicity to animal and human life and in eutrophication of receiving streams. Stringent government regulations now limit effluent volumes of affected industries. The destructive distillation of coal to produce coke, which is …
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Microbial nitrogen-cycling and cooperation in the terrestrial subsurface
… indicate that non-assimilatory nitrogen-cycling (ammonia oxidation, nitrate, nitrite and nitric oxide reduction and denitrification) potential was prevalent regardless of site-specific physicochemistry, but pathway relative abundances differed. Anammox helps to drive N loss from aquatic systems, …