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SUMMARY The presence of inorganic or organic iron in the growth medium induces the production of a reddish-violet pigment in Micrococcus violagabrielhe. This pigment protects the organism against short exposures to ultra- violet (u.v.) radiation of wavelength below 300 mp. The presence of iron also increases the degree of recovery of the normally white organism after such irradiation. Anaerobic growth renders both the red and the white micro- cocci more resistant to damage by U.V. radiation. However, the addition of nitrate, an alternative to oxygen as a terminal electron acceptor, restores the U.V. sensitivity of these micrococci to that of aerobically grown organisms. It is suggested that the initial site of U.V. irradiation damage is extranuclear and involves one or more cytochrome-linked systems, and that it is within this system(s) that the iron functions both as a radiation- protective and as a restorative agent.

The Effect Upon Micrococcus violagabriellae of Short-Term Exposure to Ultraviolet Light