[Increase in the radiation resistance of mice using Ivastimul]

A study was made of the effect of Ivastimul (IS), an aqueous extract from unicellular Chlorella algae, on the radioresistance and some haemopoiesis parameters of mice exposed to 60Co-gamma-radiation. With median and absolutely lethal radiation doses, IS was shown to produce a pronounced protective effect displayed by the increased survival rate. With sublethal doses, IS elevated the postirradiation formation of endogenous colonies and restoration of bone marrow and spleen cellularity and spleen mass.