susceptibilities of gram-negative bacterial strains isolated at the university hospital in 1987 to six beta-lactam antibiotics ( azthreonam cefmetazole , ceftizoxime , latamoxef , aminobenzyl-penicillin and piperacillin ) and two aminoglycoside antibiotics ( gentamicin and amikacin ) were examined by agar dilution and the agar diffusion method .
C0002680
aminobenzyl-penicillin
C0031955
piperacillin