SUMMARY: (van Niel strain) requires Na for growth. Its growth rate was a sigmoidal function of Na concentration, being maximal and constant from 2 to 50 m-Na, and half maximal at about 0·5 m-Na. The relationship between cell concentration and Na concentration was non-linear; cell concentration increased abruptly when Na was greater than 0·3 m. Accumulation of Na in the organism during growth was not detected. In the presence of K, respiration was enhanced specifically by Na. The respiration rate of the organism growing in the culture was a linear function of the growth rate when limited by the Na concentration, whereas the maximum rate induced by excess Na was independent of the growth rate.


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