Fig 1.

(A) Sensitivity of P. gingivalis W83 to single NO stress. P. gingivalis W83 strain was grown anaerobically to early exponential phase in BHI broth at 37°C, DEA NONOate (NO) or NaOH was added to the cultures, and the cultures were further incubated for 24 h. Each experiment was done in triplicate. The error bars show standard deviations. (B) Sensitivity of P. gingivalis W83 to multiple NO stress. P. gingivalis W83 strain was grown anaerobically to early exponential phase in BHI broth at 37°C, and DEA NONOate (NO) or NaOH was added to the cultures, followed by repeated DEA NONOate or NaOH additions for 1 h. The cultures were further incubated for 24 h. Each experiment was done in triplicate. The error bars show standard deviations.