Extreme ultraviolet radiation-sensitivity of respiratory adaptation in Saccharomyces cerevisiae cells during transition. |
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Authors: | K Pasupathy D S Pradhan |
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Affiliation: | Biochemistry & Food Technology Division Bhabha Atomic Research Centre Bombay 400 085, India |
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Abstract: | The respiratory adaptation process in both wild-type and UV-sensitive strains of was sensitive to small doses of UV-radiation (10 and 0.7 J/m2, respectively). These doses of irradiation were ineffective in arresting induced synthesis of acid phosphatase and catalase. Exposure of the irradiated cells to visible light (370 – 800 nm) could completely restitute the impaired respiratory adaptation process. UV irradiation at these doses affected DNA and RNA synthesis in maturing mitochondria in both the yeast strains. The UV-induced block could however be eliminated by exposure of the cells to visible light. These results suggest that the lesion in the UV-induced block in the respiratory adaptation may be in the DNA of promitochondria. |
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