海洋性硝酸化成細菌に関する研究-IV

亜硝酸生成細菌の亜硝酸化成作用について (2)

抄録

Of 4 strains of almost pure cultures of the marine nitrite formers (A6, S1, M2 and SW1), effects of salts on the nitrite formation were examined using the resting cells (adhering to the sand). The results obtained are as follows:
1. The optimum concentrations of sea water on the nitrite formation of the bacteria SW 1, S 1, A 6, and M 2 are about 40-50%, 50%, 60-80%, and 100%, respectively, and those of NaCl are about 0‰, 13‰, 25‰, and 30‰, respectively, and also the activities of these bacteria reduce markedly at a low concentration of salts except for the bacterium SW 1.
2. The nitrite formation of the bacterium A 6 is stimulated by Na⁺ and K⁺ but inhibited by Ca⁺⁺ and Mg⁺⁺. On the contrary, that of the bacterium SW 1 is stimulated by Ca⁺⁺, Mg⁺⁺, and K⁺ but inhibited by Na⁺. Further, the inhibition of Na⁺ on the formation of SW 1 disappears by adding Ca⁺⁺ but that of Ca⁺⁺ on the formation of A 6 does by adding the same rates of salts with those in the artificial sea water.