Figure 6
From: Enhance nisin yield via improving acid-tolerant capability of Lactococcus lactis F44
The intracellular pH of F44 and the engineered strains during fermentation process ranging at 6 h, 8 h and 10 h.
(a) Single acid-tolerant gene over-expression strains; (b) Acid-tolerant genes co-overexpression strains. Samples were taken at every 2 h for 6-10 h. Error bars, SD from three independent experiments. *p < 0.05, **p < 0.01, t-test.
