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“Supplementation of testing media by calcium and magnesium not only markedly increased the minimal inhibitory concentrations of the aminoglycosides, but also raised those of cefotaxime and the penicillins ; no significant effect was noted with 1-oxace-phalosporin.”
Antimicrobial Agents and Chemotherapy • 1980 | View Paper
“Supplementation of the testing media with calcium and magnesium increased the minimal inhibitory concentrations for the aminoglycosides, the penicillins , and TMP-SMZ against P. maltophilia.”