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. 2018 Jan 15;8:706. doi: 10.1038/s41598-017-19076-1

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© The Author(s) 2018

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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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µXRF and X-ray microscopy of treated cells. (A) Visible light image of cell exposed to raw carbon nanotubes (R-SWCNT) (a) and corresponding P, S, Ca, K, Fe XRF maps (54 µm × 70.5 µm). The X-ray microscopy absorption (c) and phase contrast (b) images of the corresponding cell are reported to the side. Panel (B) Shows the visible image of another treated cells (d) and the corresponding P, S, Ca, K, Fe XRF maps (62 µm × 50.5 µm). Fe map is displayed using a logarithmic scale. The absorption and phase contrast images were measured at the TwinMic beamline with photon energy 0.9 keV, whereas the XRF maps were acquired at ID21 beamline at 7.2 keV.