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Influence of exogenous indole on H. volcanii persistence. Percentage survival of H. volcanii pre-incubated for 1 h with or without 500 μM indole, prior to 6 h challenge with biocidal concentrations of H2O2, NaClO, and chlorhexidine. Plotted values are the mean of triplicate measurements and error bars represent ± SD. Asterisks denote significance values as determined by paired t-tests: ∗p < 0.05; ∗∗p < 0.01; ∗∗∗p < 0.001.
