FIG 2 .

Oxygen inhibition profiles of steady-state specific growth rates controlled under increasing oxygen tensions (pO₂ of in-gas). The absolute value of the slopes represents the sensitivity coefficients which are inversely proportional to the growth resistance to O₂ stress for each culture. The sensitivity coefficients were determined to be 0.127 ± 0.004 and 0.086 ± 0.005 (± standard error) for the T. elongatus axenic (TE) and binary (Binary) cultures, respectively. Each data point represents the average of measurements taken every minute over a minimum of three reactor residence times held under each respective steady state. Error bars represent ±1 standard deviation. *, significant differences with >99% certainty as determined by t test of unequal sample sizes, assuming equal variance.