Abstract

Abstract UV induction of K12(λ) is increased when proflavine (5 μg/ml or caffeine (1 mg/ml) is added to the medium in which bacteria are grown after irradiation. These substances prevent intracellular repair of UV damage that occurs in the dark (DR). They do not prevent photoreactivation of induction, but they interfere with the increased dark repair that is made possible by PhR.

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