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Although photoreactivation from certain irradiation damage is well established (Jagger, 1958), few reports have appeared on photoprotection. Weatherwax (1956) found evidence of photoprotection against ultraviolet damage in Escherichia coli strain B. Giese et al. (1954) reported photoprotection against ultraviolet damage in Colpidium colpoda when daylight was used as the protecting light. However, they found no such effect using blue light (Giese et al., 1952). Working with induction of prophage development in Staphylococcus aureus, Cantelmo (1951) reported a photoprotective effect. However, this interpretation of results has been questioned by Dulbecco and Weigle (1952), and by Jagger (1958). To our knowledge, no report has been made on photoprotection against X-ray damage.

PHOTOPROTECTION AGAINST X-RAY INACTIVATION IN NOCARDIA CORALLINA