title: Ammonia or ammonium ion as substrate for oxidation by Nitrosomonas europaea cells and extracts.
abstract: The effect of pH on the K(m) values for ammonia was studied in its oxidation by Nitrosomonas cells and cell-free extracts. The K(m) values decreased markedly with increasing pH, suggesting (NH(3)) rather than (NH(4) (+)) as the actual substrate for oxidation.
mesh_terms: D000641:Ammonia / Q000378:metabolism*; D002474:Cell-Free System; D006863:Hydrogen-Ion Concentration; D006898:Hydroxylamines / Q000378:metabolism; D009573:Nitrites / Q000096:biosynthesis; D009606:Nitrosomonas / Q000378:metabolism*; D010084:Oxidation-Reduction; D010101:Oxygen Consumption
chemical_list: D006898:Hydroxylamines; D009573:Nitrites; D000641:Ammonia