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Effect of O2 on the consumption of H2 by RD-1. Culture tubes contained an H2-CO2 gas phase (80:20%, vol/vol). Symbols: ♦, ▪, and ▾, O2 in cultures with supplemental O2; ●, O2 in cultures without supplemental O2; ⋄, □, and ▿, H2 in cultures containing 1, 0.5, and 0.25% (vol/vol) O2, respectively; and ○, H2 in cultures without supplemental O2.
