Abstract
Effects of ultraviolet irradiation on yeast cells (Candida utilis) have been studied by ultraviolet photomicrography and by biochemical analysis of ultraviolet-absorbing cellular constituents. The results of these techniques have been correlated. Much larger doses of ultraviolet irradiation are required to produce morphological changes and altered membrane permeability than to stop the ability to form colonies. Morphological changes consist in enlargement of the vacuole, followed by a decline in cell size, and, eventually, coagulation of cellular protein. The vacuolar membrane loses its selective permeability in the same fashion as the cell membrane; vacuolar constituents are released into the cytoplasm and thence into the surrounding medium along with cytoplasmic constituents. The effect of ultraviolet irradiation is not immediate; after a sufficient dose, some time is required for the completion of the release of cellular constituents into the surrounding medium. There appears to be no selective specificity in the types of compounds released, because at 25 gas- cooled C essentially all material absorbing at 260 m is lost by the cells if the exposure to ultraviolet irradiation has been high enough. (auth)
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