FIG. 1.

Growth of S. mutans at pH 7.0 and 5.2. S. mutans strain UA159 was cultured in 200-μl aliquots of BHI adjusted to pH 7.0 (♦) or pH 5.2 (▪). Growth was measured by monitoring the A₆₂₀, and error bars indicate standard deviations from experiments carried out in triplicate.