Studies on the Marine Sulfate-reducing Bacteria-III:Influences of Various Environmental Factors upon the Sulfate-reducing Activity of Marine Sulfate-reducing Bacteria (2)

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Influences of oxidation-reduction potential and various kinds of metalic ion upon the activities of marine sulfate-reducing bacteria were preliminarily studied. These enviromental factors are presumably affecting the development of sulfides in the bottom mud of the sea, and it is thought that the knowledge concerning this problem may be of use in the solution of the problem of the industrial pollution in the coastal waters. The effect of oxidation-reduction potential upon the development of the sulfate-reducing bacteria was studied, using the media containing L-ascorbic acid in various concentrations, by means of the pureculture, the mixed culture and the crude curlture. The results obtained are shown in Table 1, and may be summarized as follows: (1) In the form of pure cultures, the marine sulfate-reducing bacteria could not develop in the media which contained L-ascorbic acid in the concentrations of less than 10mg./L. (2) In the cases of mixed cultures or crude cultures, the marine sulfate-reducing bacteria were able to develop in the media containing no L-ascorbic acid. It is thought that in the cases of these cultures, aerobic bacteria existing together with the marine sulf ?? e-reducing bacteria in the media had previously prepared the anaerobic conditions for the growth of the sulfate reducers. (3) The initial stationary period of the growth of the sulfate reducers was progressively shorter with the increasing of concentration of L-ascorbic acid in the media. Using medium 2 as the basal medium, stimulative and inhibitory effects of Fe++, Mn++, Zn++, Co++, and Cu++ upon the sulfate-reducing activity of the marine sulfate-reducing bacteria were studied by the pure cultures. The results obtained are shown in Figs. 1 and 2. As may be seen, when a considerable amoun ?? of Mg and a tra ?? of Fe were contained in the cultures, the development of sulfides was stimulated by the addition of Fe++, and somewhat or completely inhibited by the addition of Mn++, Zn++, Co++ and Cu++. No antagonistic action of Mn++ upon Fe++ was observed in the sulfate-reduction. Using the basal medium which was perfectly deficient in Mg++ and Fe++, the metalic ion growth requirements of marine sulfate-reducing bacteria were studied by the pure cultures. The results obtained are shown in Tables 2 and 3 and may be summarized as follows: (1) Mg++ and Fe++ were essential for the development of the marine sulfate-reducing ba ?? cria. (2) The concentration of Mg++ required for the growth of the marine sulfate-reducing b ?? teria were somewhat higher than that of Fe++.
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Studies on the Marine Sulfate-reducing Bacteria-III:Influences of Various Environmental Factors upon the Sulfate-reducing Activity of Marine Sulfate-reducing Bacteria (2)

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