Medium and antibiotics
Standard cultures were propagated in Luria Bertani (LB) broth or LB agar with or without antibiotics. Antibiotics are added at the following concentrations: 50 μg/mL of ampicillin, 25 μg/mL of kanamycin and 50 μg/mL of gentamicin for E. coli ; 1 mg/mL of ampicillin, 100 μg/mL of kanamycin and 50 μg/mL of gentamicin for S. marcescens .