The Photoreactivable Component in the Mutagenic Action of Ionizing Radiations

M.N. Myasnik Laboratory of Molecular Biology, Institute of Medical Radiology, Academy of Medical Sciences of U.S.S.R., Obninsk, Kaluga Region, U.S.S.R.

I.I. Morozov Laboratory of Molecular Biology, Institute of Medical Radiology, Academy of Medical Sciences of U.S.S.R., Obninsk, Kaluga Region, U.S.S.R.

R.I. Derevyanko Laboratory of Molecular Biology, Institute of Medical Radiology, Academy of Medical Sciences of U.S.S.R., Obninsk, Kaluga Region, U.S.S.R.

Summary

The influence of visible light on the lethal and the mutagenic effects of gamma-radiation on E. coli WP₂ uvrA⁺ and E. coli WP₂ uvrA cells was studied. It was shown that visible light appears to reduce the yield of gamma-induced prototrophs in E. coli WP₂ uvrA cells while the yield of prototrophys in E. coli WP₂ uvrA⁺ stays unchanged. Visible light did not change the survival of gamma-irradiated cells.

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The Photoreactivable Component in the Mutagenic Action of Ionizing Radiations

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