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Time-lapse analysis of A) Escherichia coli ATCC25922 and B) Pseudomonas aeruginosa ATCC27853 tested by piperacillin using the DSTM method. Bacterial suspension of McFarland 0.2–0.3 were used. Morphological changes were visible after 80 min in E. coli and 120 min in P. aeruginosa.
