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. Author manuscript; available in PMC: 2016 Dec 26.
Published in final edited form as: ACS Appl Mater Interfaces. 2016 Sep 8;8(37):24306–24309. doi: 10.1021/acsami.6b07440

Figure 4.

Figure 4

(a) Antibacterial ratio of Staphylococcus aureus at a concentration of 106 CFU/mL after coculture with nonpolarized KNN, KNN+70 and KNN−70. The data are presented as the mean ± standard deviation (n = 4); (b) Bacterial colonies were grown on the different substrates, and counts were obtained using a standard plate counting method. The data revealed that the positively polarized KNN with a piezoelectric constant of +70 had good antibacterial properties against S. aureus, whereas KNN−70 or KNN did not have antibacterial properties.