FIG 2 .

Dose-response curves. Antibiotic concentrations used (in μg/ml) were as follows: with 2,4-D, Amp at 4/40 (S. Typhimurium/E. coli), Cip at 0.003/0.003, Cam at 4.4/-, Kan at 6/2.5, and Tet at 0.75/-; with Kamba, Amp at 2/0, Cip at 0.03/0.05, Cam at 4/20, Kan at 2/1, and Tet at 0.75/3; and with Roundup, Amp at -/20, Cip at 0.05/0.07, Cam at 2/10, Kan at 12/10, and Tet at 0.45/1. Error bars are SEM, and asterisks indicate P values (see Materials and Methods for details). *, P < 0.05; **, P < 0.01; ***, P < 0.001; ns, not significant; -, not tested.