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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. 3 — Images of barley (Hordeum vulgare) primary root tips. Light microscopic observation (magnification, ten times) of longitudinal sections of barley primary root tips of (a) control plants and (b) plants exposed to 10 μg mL⁻¹ gold nanoparticles; TEM images of root cross-sections of (c) control plants and (d) plants exposed to 10 μg mL⁻¹ gold nanoparticles. Bacteria (asterisk) and gold nanoparticles (arrows). OM outer matrix, IM inner matrix, TW thick wall [24]