FIG. 1.
Copper induction in liquid cultures of the VBNC state in E. coli. Cells grown and harvested as described in the text were placed in 0.9% NaCl liquid cultures with (○) or without (◊) 500 μM CuSO4. At various times, culturability (closed symbols) and viability (open symbols) were quantitated as described in the text. Samples lacking detectable culturable cells are plotted on the log scale as 1 cell per ml. The results presented here are from one of three trials. Bars represent standard errors.