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- W47419321 abstract "Susceptibility to UV irradiation of B. cereus BIS-59 spores undergoing germination at various stages-dormant spores to vegetative cell stage and their ability to recover from radiation damage were studied. For a given dose of radiation, the number of spore photoproducts (SPP) formed in the DNA of dormant spores was about 5-times greater than that of thymine dimers (TT) formed in the DNA of vegetative cells. At intermediate stages of the germination cycle, there was a rapid decline in the UV radiation-induced SPP formed in DNA with a concomitant increase in the UV radiation-induced TT formed in DNA. Bacterial spores undergoing germination (up to 3 hr) in the low nutrient medium (0.3% yeast extract) displayed much higher resistance to UV radiation than those germinating in the rich nutrient medium, even though there was no discernible difference under the two incubation conditions in respect of the extent of germination and the time at which the outgrowth stage appeared (3 hr). This was due to the formation TT in the DNA of spores germinating in the low nutrient as compared to that of spores germinating in the rich-nutrient medium. In UV-irradiated dormant spores, SPP formed in the spore DNA did not disappear even after prolonged incubation in the non-germinating medium. However, when the UV-irradiated dormant spores were germinated in low or rich nutrient medium, a significant proportion of SPP in DNA was eliminated. The dormant spores incubated in either of the germinating media for 15 min and then UV-irradiated were capable of eliminating SPP (presumably by monomerization) even by incubation in a non-germinating medium and in the complete absence of protein synthesis (buffer holding recovery), thereby implying that spore-repair enzymes were activated in response to initial's germination. The acquisition of photo-reactivation ability appeared in spores subjected to germination only in the rich-nutrient medium at the outgrowth stage and required de novo synthesis of the required enzymes." @default.
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- W47419321 date "1991-04-01" @default.
- W47419321 modified "2023-09-23" @default.
- W47419321 title "Influence of cellular differentiation on ultraviolet induced DNA damage and its repair mechanisms in B. cereus." @default.
- W47419321 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/1908819" @default.
- W47419321 hasPublicationYear "1991" @default.
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