Autotrophic Oxidation of Ammonium and Hydroxylamine
- M. S. Engel and
- M. Alexander
Studies of resting cell suspensions of Nitrosomonas europaea have demonstrated that high concentrations of hydroxylamine are stoichiometrically converted to NO2. The oxidation proceeded most rapidly above pH 7.5 and was affected by altering the relative concentrations of substrate and bacterial cells. Nitrification of NH4-nitrogen was retarded by increasing alkalinity and high substrate levels, but the inhibition is not as marked as observed for the NO2-oxidizing chemoautotrophs. The NH4 oxidation by intact cells was not stimulated by Fe, orthophosphate, HCO3, Mg, Cu or Zn but was inhibited by small quantities of cyanide and 2,4-dinitrophenol.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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