Change in AdhC specific activity during growth of H. influenzae . (A) Samples were taken and assayed for AdhC enzyme activity from early log phase (3 hr), mid-log phase (4.5 h), log phase (5.5 h) late log phase (8 h) and stationary phase (18 h). (B) RT-PCR for the 16SrDNA (lanes 1–4) and adhC-estD (lanes 5–8) using RNA from the time points 3 h (lanes 1 and 6), 5.5 h (lanes 2 and 7) and 8 h (lanes 3 and 8). Lanes 4 and 5 are representative negative controls. Lane 9 is the ladder. (C) At time points throughout the H. influenzae growth phase AdhC specific activity was measured from cells grown with different oxygen tensions (low tension are the black bar and high oxygen tension are the grey bars). The enzyme activity is presented as change in NADH consumed per minute per mg total protein. Y-error bars indicate +/− 1 standard deviation of the mean. Units are μmol NADH oxidized min-1 mg protein-1. The growth curves are indicated by the OD600 of cells grown at low oxygen levels (black circle) and high oxygen levels (gray box). (*P < 0.001, **P < 0.002, ***P < 0.0005).