title: Beta-lactamases in ampicillin-resistant enterobacteriaceae.
mesh_terms: D000667:Ampicillin / Q000627:therapeutic use*; D004755:Enterobacteriaceae / Q000201:enzymology*; D004756:Enterobacteriaceae Infections / Q000188:drug therapy; D006801:Humans; D010403:Penicillin Resistance; D001618:beta-Lactamases / Q000378:metabolism*
chemical_list: D000667:Ampicillin; D001618:beta-Lactamases