FIG. 3.

H. influenzae Rd KW20 was incubated with Cm at 37°C for 120 min, and aliquots were taken, acidified, and extracted with ethyl acetate at the times indicated (T0 = zero time, T5 = 5 min, etc.). The absorbance between 250 and 350 nm was determined for each extract with the peak absorbance indicated.