Effect of Gamma Radiation on E. Coli Ribosomes II: Efficiencies of Inactivation by Free Radicals

SummaryEfficiencies for the inactivation of ribosomes by the hydrogen atom, the hydrated electron, the hydroxyl radical and radicals derived from isopropanol and tertiary-butanol, have been calculated. The relative inactivation efficiencies of the hydrogen atom, the hydrated electron and the hydroxyl radical are 4·2, 0·8 and 1, respectively. The oxygen enhancement ratio for damage by the hydroxyl radical is 2·5.