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. 2016 Sep 15;11:400. doi: 10.1186/s11671-016-1607-2

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© The Author(s). 2016

Open AccessThis 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. 4 — Concentration-dependent effects of gold nanoparticle exposure on Hordeum vulgare after 2 weeks of exposure. a Photos of barley seedlings, b fresh biomass of leaves (empty symbols) and roots (filled symbols) of barley plants (mean ± one standard deviation for three individual batches with four to ten barley seedlings each), c leaf lengths, and d root lengths of barley plants (box plots represent median values including 14–21 individual data sets per concentration; bars give minimum and maximum values excluding outliers marked as red crosses) [24]