水産動物の消化管に存在するキチン分解細菌に関する研究-II : Vibrio gerrisの有機酸生成作用について

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In the previous paper1), OKUTANI studied on the formation of acids from several kinds of sugars by chitin-decomposing bacteria isolated form the digestive tracts of fish. It seems important to identify and determine those acids in order to discuss about the function of those symbiotic bacteria in the digestive tracts of fish. The present study was carried out to clarify the formation of organic acids in growing cultures of Vibrio gerris. The results obtained were as follows: 1) Organic acids accumulated in the culture were butyric, acetic, pyruvic, formic, lactic, glycolic and an unidentified organic acids (Figs. 1 and 3). Among them, acetic and lactic acids were found in high concentrations (Fig. 2). 2) When the media were added with 0.2% chitin or, and 1.0% glucose, both amounts of acetic and lactic acids increased remarkably as compared with those of other acids (Figs. 1 and 2). 3) When the media were added with 0.5% sodium acetate and lactate, there were no sensible effect on the growth, but chitinolytic activity of bacteria (Specific activity) decreased by the addition of acetate (Table 3).
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