antimicrobial agents were 5 penicillins ( carbenicillin , sulbenicillin , piperacillin , apalcillin and ticarcillin ) , 3 cephalosporins ( cefsulodin , cefoperazone and ceftizoxime ) , 5 aminoglycosides ( gentamicin , tobramycin , dibekacin , amikacin and kanamycin ) , 3 tetracycclines ( tetracyline , doxycycline and minocycline ) , chloramphenicol , colistin , polymyxin b , nalidixic acid and pipemidic acid .
C0002556
aminoglycosides
C0017436
gentamicin