Physiological response of Nitrosomonas europaea to oxytetracycline, chromium, and silver Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/hx11xh51v

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  • Nitrosomonas europaea carries out the first step in the biological nitrogen removal process in wastewater treatment by oxidizing ammonia to nitrite. It has been shown to be sensitive to a wide range of contaminants. The antibiotic oxytetracycline and the heavy metals chromium and silver have been found in wastewater influent. The physiological effects of these compounds on N. europaea have been examined in batch reactors. Select genomic responses of N. europaea after 60 minutes of silver exposure were also examined to identify potential sentinel genes for early contaminant identification. Oxytetracycline undergoes many abiotic degradation reactions, and was not found to cause a significant inhibitory effect on ammonia oxidation at expected environmental concentrations. Trivalent chromium did not significantly affect the nitrification process at environmentally relevant concentrations. Hexavalent chromium slightly inhibited nitrification at concentrations near the high end of the range of industrial effluent concentrations. Silver nitrate significantly inhibited nitrification at concentrations within the range seen in wastewater treatment plants receiving industrial inputs. This inhibition was irreversible and time-dependent. Inhibitory response was dependent on silver and biomass concentrations but unaffected by substrate concentration under the tested conditions. The four genes analyzed by qPCR were not up-regulated enough in response to silver exposure to be considered sentinel gene candidates.
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