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. 2016 Aug 17;6:31422. doi: 10.1038/srep31422

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Copyright © 2016, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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Transmission electron microscopy images, (a,b) control, and (c–f) treated cells (25 μg/ml) showing the presence of E. coli and nTiO₂ in food vacuoles (c,d). nTiO₂ is present inside (e) and outside E. coli cells (f). Red arrowhead represents nTiO₂, yellow arrow represents food vacuoles and white arrow represents bacteria.