Studies on Marine Nitrifying Bacteria (Nitrite Formers and Nitrate Formers)-V:Effects of Environmental Factors on the Nitrite Formation of Cell Free Extracts of a Marine Nitrifying Bacterium

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The cell free extracts of the marine nitrite former A 6 (almost pure culture) being prepared, effects of environmental factors on the nitrite formation of the extracts were examined, and the results were obtained, as follows: 1. By the cell free extracts, nitrites are formed from hydroxylamine but not from ammonia. Even in the former case, an amount of nitrites formed is only 40% of that of hydroxylamine added in the optimum condition. 2. The nitrite formation from hydroxylamine by cell free extracts as well as resting cells reduces scarcely with decreasing concentration of salts, although that from ammonia by resting cells reduces markedly as described in previous paper. 3. For the formation of nitrites, the optimum concentration of a substrate (hydroxylamine) is ca 0.3mM (ca 10mg/l), the optimum temperature is in the range of 50°C-55°C, and the optimum hydrogen ion concentration is around pH=8.5-8.7.
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