Abstract
Conclusion
Our data establish that photo-reactivation of both inactivation and mutation occurs after exposure of Escherichia coli SD-4 to 2250 and 2180 A UV. The magnitude of the photoreactivation after exposure to short-wave-length ultraviolet in E. coli B/r and its derivatives is confounded with a short-wave-length UV sensitization to inactivation by the PR light itself. The quite different response to photoreactivating light exhibited by E. coli strain 42–24, presumably not derived from E. coli B/r, suggests that different strains may differ in response to UV and PR light. It would seem prudent, therefore, to study a number of unrelated strains before generalizations are made concerning mechanisms of radiation action in bacteria.
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