four concentrations of aminoglycosides ( 5 to 20 micrograms of gentamicin and tobramycin per ml ) and penicillins ( 100 to 600 micrograms of carbenicillin and ticarcillin per ml ) were incubated in plasma ( 3 days , 37 degrees c ) .
C0002556
aminoglycosides
C0040341
tobramycin