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. 2016 Jun 21;7:961. doi: 10.3389/fmicb.2016.00961

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Copyright © 2016 Wong, Wang, Lacourt, Couturier, Edwards and Master.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Biogas production profile of microcosms fed with various lignocellulosic carbon sources for over 3 years. The range of stoichiometric maximum biogas yield is shown in the gray band to provide a reference for the conversion extents of the fed substrates in the microcosms [see supplemental methods for the calculation based on Buswell’s formula (Symons and Buswell, 1933)]; error bars indicate standard deviation; n = 3. C, cellulose; CL, cellulose + lignosulphonate; CT, cellulose + tannic acid; PH, poplar hydrolysate.