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The strong antibacterial activities of PEI-AgNCs. (a) Photographs of E. coli colonies on broth agar plates in the presence of sterile water and 7.81 mg/mL PEI0.6k-AgNCs. It seems that the sterile water or E. coli suspension used for the experiment was contaminated by other bacteria, but it has no effect on verifying the MICs of PEI-AgNCs; (b) The inhibition ratios of PEI-AgNCs, PEIs and AgNPs, which were calculated according to Equation 1.
