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Abstract
Abstract— Possible effects of near ultraviolet radiation (near UV) on DNA degradation were examined. Postirradiation DNA degradation induced by ionizing radiation in strain Bs‐l (uur‐, lex‐) is shown to be inhibited by carbon monoxide (CO) and potassium cyanide (KCN) if the cells are grown on glycerol. Presumably the blockage of respiration by these agents lowers the amount of ATP in the cell. 50 kJ/m2 near UV did not simulate the action of CO and KCN, indicating that at this Ruence the supply of ATP remains adequate for postirradiation DNA degradation. Near UV did not, itself, produce DNA degradation. In a strain (B/r) in which an inhibitor of postirradiation DNA degradation can be induced by both UV and ionizing radiation, near UV affects the inhibitor formation, whether administered before or after induction.
Published Version
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