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The bactericidal assay showed that the minimum concentrations of NO-releasing compounds required to kill all pathogens within 24 h were 2, 1, 25, and 1.56 mM for F68-BPEI, F68-BPEI-NO, Py-NO, and DETA-NO, respectively. The cell viability in each group was calculated by comparing the viability with that of an untreated control (100%). Asterisks indicate significant differences (P <0.05) between groups.
