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. 2020 Oct 7;10:16680. doi: 10.1038/s41598-020-73497-z

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Cellular uptake of Cu₂O NPs after 24 h of exposure of bacterial strains to various dosages of Cu₂O NPs at 37 °C. Data are means ± standard deviations of three independent experiments each performed in triplicates. There was no statistically significant difference between the amount of copper internalized at 62.5, 125, and 250 µg/mL treatments at pH 5 and pH 7 in each of the strains (p > 0.05).