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. 2017 Oct 16;10:236. doi: 10.1186/s13068-017-0921-y

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© The Author(s) 2017

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. 1 — Visualization of corn straw by tabletop microscopy (× 500). a Untreated corn straw, and b corn straw pretreated with biogas slurry, and c corn straw pretreated with fresh water for 6 h at 140 °C with 1.34% NaOH (w/v) and 100 g L⁻¹ substrate concentration