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. 2020 Jan 8;202(5):995–1004. doi: 10.1007/s00203-019-01803-z

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© The Author(s) 2020

Open AccessThis 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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Fig. 2 — The antimicrobial effect of metal ions and graphene-based compounds on the metabolic activity of biofilm cells of P. aeruginosa: aP. aeruginosa NK1 and bP. aeruginosa NK2 isolates as assessed by percentage reduction in XTT colorimetry. Data shown as mean (± SD). The dotted red line signifies the threshold for minimum antibacterial activity