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MDR-EC colony-counting assay after treatment for 8 h with Ag/Au-NPs at atomic ratios (Ag:Au) of (A) 20:80, (B) 40:60, (C) 60:40 and (D) 80:20. Data = mean ± SD, N = 3. ** p < 0.01 versus control (0 µg/mL concentration). The statistical analysis was based on a t-distribution.
