title: Combination effect of piperacillin with cefoperazone on staphylococci and gram-negative bacteria.
mesh_terms: D001419:Bacteria / Q000187:drug effects*; D002438:Cefoperazone; D002511:Cephalosporins / Q000494:pharmacology*; D004347:Drug Interactions; D008826:Microbial Sensitivity Tests; D010406:Penicillins / Q000494:pharmacology*; D010878:Piperacillin; D013210:Staphylococcus / Q000187:drug effects*
chemical_list: D002511:Cephalosporins; D010406:Penicillins; D002438:Cefoperazone; D010878:Piperacillin