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Flow cytometric analysis of SYTO 9-PI (propidium iodide)-stained S. aureus ATCC 6538. (A) untreated; (B) treated with CHQA at 2 × MIC for 3 h; (C) treated with 70% isopropyl alcohol for 3 h. Regions R1 and R2 represent the membrane damaged or dead cells and live cells, respectively.
