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. 2016 Mar 18;13(3):334. doi: 10.3390/ijerph13030334

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© 2016 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons by Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).

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The inhibition zones yielded by PEI-AgNCs. PEIs, AgNPs and the positive and negative controls for E. coli. (a) Their images. The size of each image is 3 cm × 3 cm; (b) The statistic results of the diameters of these zones.