Fig. 3. Acidification profiles of S. thermophilus isolates in 10 g/100 mL sterile skimmed milk (with 1 g/100 mL yeast extract). The acidification curves of isolates that could reduce the
pH below 4.6 within 5 h are indicated with red color, and the acidification curve of the 10 g/100 mL skimmed milk that was used as negative control is indicated with orange color.
(For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)