the concentration of living bacteria in medium with 2 mM ferulic acid
was 32.1 × 106 cells/mL, while the reference medium
without ferulic acid only contained 23.4 × 106 cells/mL.
This was not due to a buffering effect, as the pH decreased
to 2.8 in all the media (Figure 3B). The concentration of
ferulic acid did not change very much during the cultivation
(Figure 3D).