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. 2005 Mar;49(3):1225–1228. doi: 10.1128/AAC.49.3.1225-1228.2005

FIG. 1.

FIG. 1.

Synergy testing, using the checkerboard method. a-d, four increasingly penicillin-resistant strains were tested with combinations of Cpl-1 and gentamicin. Strain DCC1490 was killed synergistically (a); strains DCC1476 and DCC1420 were not quite killed synergistically (b-c) and 8249 not at all (d). e-h, the same strains were tested with combinations of Cpl-1 and penicillin. Only strain 8249 (h) was killed synergistically. The amount of the antimicrobial agents is expressed as an FIC on both scales. Error bars show standard deviations.