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. 2015 Apr 22;10(4):e0122884. doi: 10.1371/journal.pone.0122884

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© 2015 Li et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Fig 4 — a) photograph of peanut plants in containers after 13 days, b) photograph of peanut plants after 18 days, c) length of the stems of the peanut plants, d) weight of the peanut plants, e) TEM image of root tissue of NZVI-40, and f) TEM image of root tissue of CK. Different letters show significant differences (p⩽0.05) and bars represent the standard error of treatments (n = 4). NZVI was indicated by dark arrow.