The Effects of γ-Ray Irradiation on Bacillus natto

概要

論文の詳細を見る
The following results were obtained when the spores of B.natto isolated from natto (fermented soybean) were ir-radiated with 60Co γ-rays: 1. Irradiation of the spores at 1.86, 3.72 and 7.44× 105 rad resulted in decrease in bacterial counts by 97, 99.7, and 99.996%, respectively. These results are in agreement with those previously reported by Teramoto. 2. Irradiation of 3.7× 105 rad gave a large number of isolates that produce more mucilage than the non-irradiated spores. 3. The isolates obtained by irradiation of more than7.44× 105 rad showed decrease in protease activity and mucilage production. 4. The colonies formed on the synthetic medium fromirradiated spores differed in appearance from those of non-irradiated, although the mucilage produced by the former wasfound to be composed of polyglutamate.
日本食品照射研究協議会の論文