[Relationship between an organism's radiosensitivity and its level of repair processes]

Radioresistance and repair intensity were simultaneously studied in 13 stocks of Drosophila melanogaster. The frequency of exceptional males in the progeny of X-irradiated females was used as radioresistance criterion. Repair intensity was estimated by the radiation after-effect which was determined under successive action of the radiation and elevated temperature (37 degrees C). It has been shown that the higher is the stock radioresistance, the higher are repair capacity of the stock. However, it has been revealed that relatively independent combining of radioresistance and repair intensity is possible, excluding one, "forbidden" combination: there are no organisms which are sensitive to radiation and have a high repair level. The last law appears to have a general biological nature, it is characteristic for microorganisms (Escherichia coli), plants (Vicia faba) and insects (D. melanogaster).