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. 2016 Nov 21;9:254. doi: 10.1186/s13068-016-0666-z

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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. 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. 4 — SEM images of microbial community of UASB_H (a) and PBR_H (b), UASB_M1 (c), PBR_M1 (d), UASB_M2 (e), and PBR_M2 (f). Red arrows indicate bamboo-like microbes