The stock culture strains E. cloacae (ATCC 49141, NR1, NR2, NR3 controls and R1-, R2-, R3-resistant strains) were subcultured twice on LB agar plates and then grown on MacConkey agar plates at 37 ...

A solid citrate agar medium has been prepared by adding agar and brom-thymol blue to one of the citrate solutions recommended by Koser. Escherichia coli was markedly or completely inhibited on this ...