Reference: Shvedenko VI, et al. (2001) [Comparative study of RBE of densely ionizing radiation for various types of cell death in yeast]. Radiats Biol Radioecol 41(4):361-5

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Abstract


A comparative study of the relative biological effectiveness (RBE) of alpha-particles 249Pu for reproductive and interphase forms of killing of haploid and diploid yeast cells of wild-type and their radiosensitive mutants has been carried out. The correlation between the RBE of alpha-particles and cell repair capacity was confirmed for reproductive death: it was the highest for diploid cells, smaller for haploid cells and the smallest for their radiosensitive mutants. To achieve the interphase cell killing much higher irradiation doses were used after which cells were incapable of liquid-holding recovery during the storing of exposed cells in non-nutrient media at 30 degrees C. The RBE values for this form of killing were significantly lower in comparison with reproductive death. These data are an additional argument supporting the point of view that the RBE of densely ionizing radiation is determined not merely by physical processes of energy absorption as it is traditionally believed but also by ability of cells to recover from DNA damages inflicted by ionizing radiation.

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Journal Article
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Shvedenko VI, Kabakova NM, Petin VG
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