Killing of P. aeruginosa cells by ofloxacin. (A) Cells of logarithmic-phase, stationary-phase, and biofilm cultures were treated with ofloxacin for 6 h and then plated for colony counting. The conditions were as described in the legend to Fig. 1. Biofilm, diamonds; stationary-phase cells, circles; logarithmic-phase cells, squares. (B) Data of panel A replotted as percent survival.