Abstract
Data are presented te show that high levels of catalase in Rhodopseudomonas spberoides protect sgainst inactivation by added hydrogen peroxide but not against inactivation by x irradiation. The degree of protection against hydrogen peroxide is in good agreement with theoretical predictions. Oxygen enlances damsge by x irradiation but reduces damage caused by hydrogen peroxide diffusion into the cell. lt is concluded that diffusing hydrogen peroxide is not a major intermediate in radiation damage of these cells. (auth)
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