Abstract
Five strains of sulfate-reducing bacteria, previously isolated from North Sea waters and identified asDesulfovibrio vulgaris, were investigated for their abilities to survive in aerobic natural seawater. Viable organisms of all strains were recoverable after exposure to oxygen for more than 72 h. The level of the protective enzymes superoxide dismutase and catalase detectable in these strains and the low rates at which oxygen was reduced probably account at least in part for their considerable abilities to survive in aerobic environments. The autoxidizable nature of cytochromec 3 and KCN-inhibitable cytochromec oxidase activity present in these bacteria are postulated to act as possible oxygen-scavenging mechanisms analogous to the activity of NADH oxidase present in certain other strict anaerobes.
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