The Oxygen Effect in E. Coli WP2: The Role of the Photoreactivatable Component in Modification of the Oxygen Effect in E. Coli WP2 uvrA6

N.G. Selyova Laboratory of Radioactive Preparations, Institute of Medical Radiology, 249020, Obninsk, Kaluga Region, U.S.S.R.

V.G. Skvortzov Department of Medical Physics, Institute of Medical Radiology, 249020, Obninsk, Kaluga Region, U.S.S.R.

M.N. Myasnik Laboratory of Radioactive Preparations, Institute of Medical Radiology, 249020, Obninsk, Kaluga Region, U.S.S.R.

Summary

The role of photo-products induced by secondary U.V. which accompanies high-energy gamma-radiations has been studied in bacteria in the presence and absence of oxygen. The photodamage makes an essential contribution to the lethal effect of ionizing radiation in U.V.-sensitive strains in anoxia and thus can influence the value of the oxygen effect. When the secondary U.V.-contribution was minimized (irradiation by X-rays or gamma-rays in the presence of 1 per cent nigrosine) the oxygen enhancement ratio was shown to increase and approximate to that for E. coli WP2 cells.

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The Oxygen Effect in E. Coli WP2: The Role of the Photoreactivatable Component in Modification of the Oxygen Effect in E. Coli WP2 uvrA6

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The Oxygen Effect in E. Coli WP2: The Role of the Photoreactivatable Component in Modification of the Oxygen Effect in E. Coli WP2 uvrA6

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