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E. faecalis was challenged with pH 8, pH 9, pH 10, and pH 11 conditions after being initially treated with MTAD, MTAN, or MTADN for 1 min. Furthermore, E. faecalis without pretreatment with drugs was used as a control. Graphs of the E. faecalis survival rates vs. time were plotted. The y-axis represents the logarithmic value of the viable cell concentration (CFU/ml), and the x-axis represents the time of challenge.
