FIG 1.

bla_NDM-1 decay kinetics in nontreated (black circles) and PMA-treated (white circles) biomass fractions under anaerobic (a) and aerobic (b) conditions at 0 μg/liter of meropenem (n = 3). Plasmid stability under anaerobic (c) and aerobic (d) conditions was evaluated by comparing the bla_NDM-1 (white circles) and uidA (white triangles) decay rates in PMA-treated biomass fractions (n = 3). Arrows in panel d indicate sampling points at which transconjugants were recovered by plating techniques.