Summary: Spores of had low levels of respiratory activity partially sensitive to cyanide and salicylhydroxamic acid (SHAM). They contained a full set of cytochromes but in low concentrations, especially cytochromes aa. Aerobic growth induced a rapid increase in respiratory activity resistant to SHAM but fully sensitive to cyanide, and in the levels of cytochromes, mainly cytochromes aa. These processes were subject to catabolite repression. Incubation under anaerobic conditions, independent of cell morphology, favoured the persistence of SHAM-sensitive respiration, and the maintenance of low levels of and cytochromes. No cytochromes aa were formed under these conditions. CO-difference spectra suggested the presence of cytochrome in higher levels in aerobic than in anaerobic cells.


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