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Figure 1: Mass spectra of imipenem hydrolysis assay. The upper three panels (a-c) represent imipenem after a 3 h period of incubation with Acinetobacter baumannii imipenem-susceptible strains at 37°C, where intact imipenem appears at 300 m/z. The lower panels (d-f) represent imipenem after incubation with Acinetobacter baumannii-resistant strains for the same duration and temperature, where imipenem hydrolysis product appears at 254 m/z.

Figure 1: Mass spectra of imipenem hydrolysis assay. The upper three panels (a-c) represent imipenem after a 3 h period of incubation with <i>Acinetobacter baumannii</i> imipenem-susceptible strains at 37°C, where intact imipenem appears at 300 m/z. The lower panels (d-f) represent imipenem after incubation with <i>Acinetobacter baumannii</i>-resistant strains for the same duration and temperature, where imipenem hydrolysis product appears at 254 m/z.