Fig. 3From: Acid tolerance in early colonizers of oral biofilmsAbility of different streptococcal (a) and Actinomyces (b) strains to induce an ATR during exposure to an adaptation pH (pH 5.5). Control cells were kept at pH 7.5. Increased acid tolerance (indicating induction of an ATR) was evaluated after an acid challenge (pH 3.5) followed by LIVE/DEAD® BacLight™ staining and CLSM, and expressed as % viability. The graphs show the mean and standard deviation of three independent biological replicates. **P < 0.001Back to article page