Fig. 2.

Model fits to adjusted viability data from all 54 plates (top plot), and from 28 plates for which the LNS model yielded fits (to corresponding unadjusted data sets) that are all relatively predictive (R² ≥ 0.91) and have relatively steep initial slopes (b ≥ 2—see Table 1) (bottom plot). Error bars denote ±1 SEM. Fitted models shown in each plot are: lognormal (dashed curve), cubic-hormetic (solid curve), and cubic (dotted curve, which nearly coincides with the dashed and solid curve at C ≤ 3 μM and C ≥ 4 μM, respectively).