FIG. 3.

Killing of P. aeruginosa cells by tobramycin. (A) Cells of logarithmic-phase, stationary-phase, and biofilm cultures were treated with tobramycin for 6 h and then plated for colony counting. The conditions were as described in the legend to Fig. 1. Note that the experimental points for logarithmic-phase cells essentially align at the y axis due to the scale of this graph. Complete killing of logarithmic-phase cells was achieved with tobramycin at 4 μg/ml. The open square shows that the data point was at or below the limit of detection. Biofilm, diamonds; stationary-phase cells, circles; logarithmic-phase cells, squares. (B) Data of panel A replotted as percent survival.