Oxidation-reduction potentials of haemolytic streptococci

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Abstract
Addition of catalase inhibits peroxide formation in cultures of hemolytic streptococci, and the effect is closely similar to that observed with pneumococci. Reducing conditions are maintained after the logarithmic phase of growth, when catalase has been added to the culture. The electrode potential falls to a lower level in aerated cultures when catalase is added, and the high level corresponding to peroxide formation is not reached. Addition of catalase to a culture containing peroxide causes immediate and rapid fall in potential, despite the resulting vigorous oxygenation of the culture.

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