麹菌の変異に關する研究(第3報) : A. 誘発変異について (3)

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With the O_1-2 strain that was obtained by trating a parent strain with electric supersonic wave and was found to be the most excellent enzyme producer among the variants reported before, we repeated the same treatment and got anew many variants.From these variants we selected O_1-2-8 strain and O_1-2-55 strain, of which the former was most excellent in enzyme production and the latter, though inferior in that ability, showed a notable morphological variation, and the biochemical characteristics of these new variants were compared with those of their grandparent, 2 a.1) The liquefying power is more enhanced than the saccharifying power in the strain, the amylase activity of which has more increased by the second treatment with electric supersonic weve.2) The growth of variants, of which the enzyme-producing power has enhanced by treating with electric supersonic wave, tends to be somewhat inferior to that of their parent strain. But, when peptone is given as nitrogen source, the growth of the variants becomes better. This is an interesting fact in connection with the problem of untrition of the variants.3) In submerged culture of the O_1-2-8 strain ammonium phosphate was best suited as inorganic nitrogen source for amylase production, but peptone as nitrogen source brought better results in protease production than inorganic and organic salts and amino-scids.4) Although amino-acids as nitrogen source exerted no good effects on the enzyme produciton, they were more favorable for conidia formation than the other nitrogen sources.
公益社団法人日本生物工学会の論文
1953-06-15

麹菌の変異に關する研究(第3報) : A. 誘発変異について (3)

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