various gram-negative bacilli and gram-positive cocci were grown in the presence of amikacin , gentamicin , tobramycin , ampicillin , amoxicillin , oxacillin , carbenicillin , ticarcillin , and cefamandole at concentrations varying from eight times the minimal inhibitory concentration ( mic ) to 1/128 of the mic .
C0002680
ampicillin
C0002645
amoxicillin