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. 2021 Feb 10;11(2):451. doi: 10.3390/nano11020451

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© 2021 by the authors.

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

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Bar graph showing the diameter of the zone of inhibition (in mm) produced by (a) pure and (b) Zn-doped CuO nanoparticles (NPs) against gram-positive and gram-negative bac-tria.