Ammonia or Ammonium Ion as Substrate for Oxidation by Nitrosomonas europaea Cells and Extracts

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RESUMO

The effect of pH on the Km values for ammonia was studied in its oxidation by Nitrosomonas cells and cell-free extracts. The Km values decreased markedly with increasing pH, suggesting (NH3) rather than (NH4+) as the actual substrate for oxidation.

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