FIG. 4.

Carbon monoxide consumption after incubation with antibiotics and 500 ppm of CO for 1 day (open bars) and 5 days (solid bars). See the text for the concentrations of antibiotics used. Amp, ampicillin; CTC, chlorotetracycline; Cyc, cycloheximide; Nys, nystatin; Str, streptomycin. The following values were significantly different (P ≤ 0.007): day 5 control value and day 5 streptomycin value; day 5 control value and day 5 ampicillin value; and day 5 streptomycin value and day 1 streptomycin value. Data are means ± 1 standard error (n = 3). gdw, gram (dry weight).