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SUMMARY: Respiratory processes in Spirillum serpens and S. itersonii were compared with those in the microaerophile S. volutans. Rates of oxygen consumption with various substrates and the catalase activity were lower in S. volutans. The activities of five citric acid cycle enzymes and reduced nicotinamide adenine dinucleotide oxidase in cell-free extracts were also 10-to 200-fold lower. The concentration of cytochrome c was greater in the oxygen-insensitive spirilla. This may explain the poor growth of S. volutans: it is unlikely that the complete inhibition of growth in aerated cultures is due to a haemoprotein deficiency.
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