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Summary
The degradation of DNA after irradiation was determined in Escherichia coli wild type (parent) and three radiation-resistant mutants 1γ, 6γ and 12γ by measuring the loss of radioactivity from cells previously labelled with [3H] thymidine. Large differences exist in rates and extent of DNA degradation among these bacterial strains. The maximum degradation was approximately 70 per cent in the parent strain, 50 per cent in the 1γ strain and 15 per cent in the 6γ and 12γ strains.