魚類の腸内細菌によるビタミンB群の消長-III : ビタミンB12合成菌の分離とその性状

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In preceding papers, the authors studied on the production of B-vitamins by intestinal bacteria of carp. This paper deals with the vitamin B12 synthesizing ability of intestinal bacteria. Of the 198 strains of bacteria isolated from the intestinal canal of carp, the vitamin B12 synthesizing capacity was researched. Concerning the 5 strains having a comparatively high synthesizing capacity, the vitamin B12 content of intra- and extra bacterial cells were studied. The results obtained were as follows; 1. Of all the strains isolated from the intestinal canal of carp, the number of rods ex-ceeded that of coccus, and the ratio of both type of bacteria was shown to be nearly equal. (Table 1) 2. About half of intestinal bacteria produced some vitamin B12, while no vitamin B12 decomposing bacteria could be found in this study. (Table 2) 3. Intestinal bacteria of high productive ability of vitamin B12 belongs mostly to Gram-negative rods, and they show a pretty high level of B12-production, though not so remarkable as is to be seen in Actinomyces. 4. Vitamin B12 content in the bacterial cells increased gradually during growth, while the vitamin B12 in the culture medium reached to a highest level after 6 hours of incubation, and after that time almost no increase was to be observable. (Table 4 and Fig. 1)
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