Analysis of the growth of 13 sensor knockout strains cultured in acidic media (pH 6.0) in an atmosphere containing 5% CO
. The CFU/ml after 23 h, broth culture of wild-type strain 1529 and its derived sensor knockout strains are shown. Viable counts were performed on BHI-Y and sheep blood agar plates. At least three independent experiments were performed. The error bars indicate the standard error of the mean (SEM).