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. 2016 Jan 16;14:5. doi: 10.1186/s12951-016-0158-0

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© Hou et al. 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. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 3 — Optimization of Fe₃O₄ NPs concentration in immobilization support. k-Carrageenan was used as the immobilization support. The effect of varying the Fe₃O₄ NPs concentration (0, 3, 6, 9, and 12 g/L) was investigated. The error bars in the figure indicate the standard deviation of three parallel replicates