FIG. 1.

The effect of lethal and sublethal concentrations of SNP on actively growing cells of C. sporogenes. SNP was added to cultures that had reached an absorbance (550 nm) of 0.5, corresponding to 5 × 10⁵ cells ml⁻¹, at a final concentration of 10 (▵), 20 (□), 40 (○), or 80 (■) μM. The effect on growth was monitored at time intervals and compared to that for control cells (•). (A) Growth shown as change in absorbance at 550 nm. (B) Viability of cells shown as CFU per milliliter. Each datum point is the mean of at least three experiments. Absence of growth is given a value of 1.