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DARK RECOVERY PHENOMENA IN YEAST. 1. COMPARATIVE EFFECTS WITH VARIOUS INACTIVATING AGENTS

Journal Article · · Radiation Res.
DOI:https://doi.org/10.2307/3571521· OSTI ID:4113236
If x irradiated diploid cells of Saccharomyces cerevisiae are stored for 3 to 5 days in the dark in distilled water or in phosphate buffer at 30 deg C, their viability as determined by plating is much greater than if they are plated immediately after irradiation. A similar storage effect was observed with diploid cells treated with ultraviolet radiation or with nitrogen mustard (HN2). No such recovery was observed after heat inactivation or acridine-sensitized photoinactivation. In a given experiment, recovery is characterized by a constant dose-modifying factor, but a wide variation of the DMF is observed for different inactivating agents. Control experiments demonstrate that the recovery does not arise from post-irradiation cell multiplication in the storage medium. The storage procedure is also effective in reducing the fraction of respiratory- deficient colonies after ultraviolet or x irradiation. Recovery occurs in the dark and is partially additive to photoreactivation. Plating on a minimal medium immediately after exposure to x rays or ultraviolet also enhances viability on a constant dosemodification basis. Ploidies higher than diploid also exhibit recovery; on the other hand, haploid yeast does not recover from x-ray inactivation and displays only slight recovery from ultraviolet, or from HN2 inactivation. (auth)
Research Organization:
Univ. of Chicago
Sponsoring Organization:
USDOE
NSA Number:
NSA-18-008183
OSTI ID:
4113236
Journal Information:
Radiation Res., Journal Name: Radiation Res. Vol. Vol: 21
Country of Publication:
Country unknown/Code not available
Language:
English

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