Starvation of protozoans increases their sensitivity to ultraviolet radiations and affects the photoreversibility of ultraviolet injury by visible light (Giese and Reed, 1940; Giese et al., 1954; Brandt et al., 1955). The present study on the variation with nutritional state of the sensitivity of yeast to ultraviolet and its photoreversal was initiated with the aim of relating the specific nutrients or enzyme systems involved in the changed ultraviolet sensitivity resulting from starvation. In addition the effects on ultraviolet injury and its photoreversal of some factors which affect the physiological state of the yeast, especially oxygen tension and selective enzyme poisons, were investigated; findings which emerged are presented below.
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