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The bactericidal effect of Mitomycin C on E. coli B and the partial reactivability of MC induced cell-inactivations depends on the genotype, the composition of the plating medium and the postincubation temperature in a way rather similar to that found in corresponding UV-experiments. This indicates that at least one type of MC-induced damage in E. coli must be identical or similar with lesions produced by UV.
The kinetics of MC-bindung to the cells is the same for the wildtype and an MC-resistant mutant. The temperature coefficient Q10 for binding of MC is between 2 and 4 in the range from 20 °C to 45 °C ; this shows that the MC-uptake is propably not limited by physical reasons.
The results have been discussed considering the hypothesis that MC acts by activating the cellular DNase.