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Figure 3. Developed acidity of pure and mixed cultures of L. bulgaricus and S. thermophilus. Open circles, S. thermophilus; closed triangles, L. bulgaricus; open triangles, sum of developed acidity of pure cultures; closed circles, mixed culture. Source: Reprinted with permission from Journal of Food Protection and Marcel Dek-ker, Inc. Reprinted from Reference 39, page 511, courtesy of Marcel Dekker, Inc.

mophilus. Higher acid production with mixed cultures was obtained and compared to pure cultures, as can be seen in Figure 3 (39,52). This is an example of commensalism in mixed cultures. Details of the kinetics and mathematical relationships of interactions between S. thermophilus and L. bulgaricus are presented in an article by Fung etal. (39).

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