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. 2017 Sep 11;19(9):316. doi: 10.1007/s11051-017-3993-5

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© The Author(s) 2017

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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.

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Fig. 1 — UV-Vis spectra of Au NP solutions a in different media (4.3 × 10¹¹ NP ml⁻¹) and b after a few minutes or after 1 week in complete cell culture medium (with 2% serum)