title: The transfer of intrinsic resistance to penicillins in enteric bacteria by an R factor.
mesh_terms: D002463:Cell Membrane Permeability; D004926:Escherichia coli / Q000187:drug effects / Q000201:enzymology*; D010403:Penicillin Resistance; D010405:Penicillinase / Q000032:analysis*; D010406:Penicillins; D012475:Salmonella / Q000187:drug effects / Q000201:enzymology; D014732:Vibration
chemical_list: D010406:Penicillins; D010405:Penicillinase