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. 2018 Mar 9;11:61. doi: 10.1186/s13068-018-1054-7

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© The Author(s) 2018

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. 6 — STA analysis of thermal behavior of birch samples. Thermogravimetric (TG) (a) and the Gram Schmidt (GS) curves (b) of untreated (1), steam-exploded (2), HL (3), and HL birch after AD (4)