Abstract
SummaryThe effects of tritium-emitted beta-radiations have been tested on the germination time, the period of lag, the cellular permeability and the respiratory quotient of Rh. gracilis treated with tritiated water in the presence of different concentrations of cystamine.In our experimental conditions, cystamine at the metabolically-inactive concentration 2·5 × 10−4 M showed no radioprotective activity on the cells, while at the metabolically-active concentration 2·5 × 10−2 M cystamine was capable of counteracting the effects of beta-rays. The cellular permeability remained unchanged in every treatment.The radioprotective action therefore seems to depend on the metabolic alterations brought about by the radioprotectant itself.
Published Version
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