Key physiology of anaerobic ammonium oxidation

Article Abstract:

The physiology of anaerobic ammonium (anammox) oxidizing aggregates grown in a sequencing batch reactor was studied quantitatively. The physiological pH and temperature ranges were 6.7 to 8.3 and 20 to 43 deg C, respectively. The affinity constants for the substrates ammonium and nitrite were each less than 0.1 mg of nitrogen per liter. The anammox process was totally inhibited by nitrite concentrations higher than 0.1 g of nitrogen per liter. Addition of trace amounts of either of the anammox intermediates restored activity completely.

Ammonium, Oxidation-reduction reaction, Oxidation-reduction reactions, Biomass, Anaerobic bacteria

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Sulfur production by obligately chemolithoautotrophic Thiobacillus species

Article Abstract:

Transient-state studies of the obligately autotrophic Thiobacillus sp. strain W5 showed that sulfide oxidation occurs in two physiological phases. These are the sulfate-producing phase and the sulfur- and sulfate-producing phase, after which sulfide toxicity occurs. Sulfur was formed when the maximum oxidative capability of the culture was attained. Measurements of the in vivo degree of reduction of the cytochrome pool as a function of increasing sulfide supply indicated a redox-related down-regulation of the sulfur oxidation rate.

Bacillus (Bacteria), Bacillus

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