Nitrous oxide production by Alcaligenes faecalis under transient and dynamic aerobic and anaerobic conditions

Article Abstract:

Alcaligenes faecalis TUD produces nitrous oxide (N2O) under both aerobic and anaerobic conditions. The N2O production is highest under oxygen-limited conditions. As N2 production decreases, the cells accumulate N2O during an anaerobic to aerobic shift. The aerobic to anaerobic shift induces the instant production of N2O. Dynamic changes from aerobic to anaerobic and vice versa produce a semisteady state after 67 cycles. During this stage N2O is produced mainly after the anaerobic to aerobic shift. N2O production in the dynamic state is more than that during anaerobic conditions.

Physiological aspects, Oxygen, Microbiological synthesis, Nitrous oxide, Bacteria, Nitrifying, Nitrobacteraceae

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Autotrophic growth of anaerobic ammonium-oxidizing micro-organisms in a fluidized bed reactor

Article Abstract:

A synthetic inorganic mineral medium for the enrichment of the microorganisms capable of anaerobic ammonium-oxidizing (Anammox) was developed. Its sole electron donor and electron acceptor were ammonium and nitrite, respectively, and carbonate was the only carbon source. An increase in Anammox capacity of the enrichment was observed, which is directly linked to a greater number of morphologically conspicuous microorganisms, ether lipids and cytochromes.

Nitrites, Anaerobic bacteria, Denitrification, Nitrification

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Metabolic pathway of anaerobic ammonium oxidation on the basis of 15N studies in a fluidized bed reactor

Article Abstract:

A novel metabolic pathway for anaerobic ammonium oxidation was proposed on the basis of 15N-labelled studies. Experiments revealed that ammonium was biologically oxidized with hydroxylamine as the most probable electron acceptor. The oxidation of nitrite to nitrate was suggested to provide the anaerobic ammonium-oxidizing bacteria with the reducing equivalents significant for CO2 fixation.

Usage, Oxidation-reduction reaction, Oxidation-reduction reactions, Mass spectrometry

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