Figure 4

MTT assays of strains A3242 (A) and B2A1Ga1 (B). Data shown are the mean values (± standard deviations) obtained from three independent experiments. ***Significantly different from the value of Control (without metal), p < 0.001, respectively. Relative Optical Density Units (RODU) means the ratio between the OD550 (absorbance at 550 nm) of the sample (test) and the OD550 of the control experiment.