it was shown that a strain of serratia liquefaciens harbors a conjugative r-plasmid responsible for reistance to the following 14 antibiotics : ampicillin , carbenicillin , cephalothin , butirosin , neomycin , paramomycin , kanamycin , lividomycin , gentamicin , tobramycin , streptomycin , tetracycline , sulfonamide , and chloramphenicol , which belong to five families , the beta-lactamines , the aminoglycosides , the tetracyclines , the sulfonamides , and the phenicols .
C0022487
kanamycin
C0002556
aminoglycosides