title: [Ultraviolet irradiation of Saccharomyces cerevisia: variations during meiosis in survival and in the induction of the cytoplasmic "petite" mutation].
abstract: Cyclic variations in sensitivity to killing and cytoplasmic "petite' (p-) induction by ultraviolet light occur during the meiosis of Saccharomyces cerevisiae. Maximal sensitivity to killing coincides with the period of meiotic nuclear DNA synthesis. Cyclic fluctuations in p- induction could not be correlated with known meiotic events and the pattern could vary temporarily from batch to batch. A dark liquid holding of irradiated cells aided the repair of lethal lesions but on the other hand an enhancement of "petite" induction was observed at all meiotic stages.
mesh_terms: D003593:Cytoplasm / Q000528:radiation effects; D004247:DNA / Q000096:biosynthesis; D005508:Food Deprivation; D008540:Meiosis; D008928:Mitochondria / Q000528:radiation effects; D009154:Mutation / Q000528:radiation effects*; D011830:Radiation Effects; D012441:Saccharomyces cerevisiae / Q000528:radiation effects*; D013997:Time Factors; D014466:Ultraviolet Rays
chemical_list: D004247:DNA
vernacular_title: Irradiation aux ultraviolets de Saccharomyces cerevisiae: variations au cours de la méiose de la survie et de l'induction de la mutation cytoplasmique "petite colonie"