納豆菌ファージ : (第4報) 納豆製造工場のファージ

概要

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The status of natto plant pollution by bacteriophages throughout Japan was investigated For this purpose, about three samples were taken from the fermentation room, workshop and overflow of each plant to detect the presence of phages. Of the sixty plants tested, about one half of them were found to be contaminated with phages of 5 to 2000 plaque-forming units per 1 cm^3 of these samples. Heavy contamination with phages was observed particularly in the fermentation room, where the presence of the phages was 20 to 100 times heavier than those in the other sampling places.About fourty different strains of phages were singly isolated from these contaminated plants and classified by comparing their some general properties and grouping them serologically.These phages fell into four types by the plaque morphology and classified serologically into two groups. One group was a virulent phage which had a regular six-sided head (900×900Å)and a contractile tail (220×2000Å) with a base plate. The other was a lysogenic phage which had a regular six-sided head (780×780Å) and a noncontractile tail (110×2050Å) with a forked tip.
社団法人日本生物工学会の論文
1970-11-25