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- W2299524628 abstract "The mutagenous effect of ionizing radiation of Co/sup 60/ on living cells was demonstrated in irradiated bacteria. The expression of phenotypic mutation was determined on four conditions, namely, the change of dimensions of cell size, the textures of giant colonies observed under visible light, the fluorescence of giant colonies observed under ultraviolet ray of 366 m mu wave length, and the production of amino acids in the culture media. Nine strains of soil bacteria including Bacillus brevis, Bacillus megatherium, Bacillus circulans, Bacillus pumilus, Micrococcus candidus and Brevibacterium erythrogenes were used as the test organisms. In general, the morphological mutation was obviously induced in the rod-shape bacteria. Among them Bacillus pumilus, particulary, was sensitive to the effect of radiation. Under the dosage of 5000 roentgens the irradiated bacillus produced daughter cells of one-fourth to one- half the parent size. No reversion was observed in the clones of such smaller organisms even after many transfers. The morphological mutations have been proved to be reproducible. (auth)" @default.
- W2299524628 created "2016-06-24" @default.
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- W2299524628 date "1960-02-01" @default.
- W2299524628 modified "2023-09-27" @default.
- W2299524628 title "Co$sup 60$ RADIATION-INDUCED PHENOTYPIC MUTATION OF SOIL BACTERIA" @default.
- W2299524628 hasPublicationYear "1960" @default.
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