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. 2017 May 3;16:77. doi: 10.1186/s12934-017-0692-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. 4 — Hydrogen production and metabolites production via strain MJ1 with DAPSBH. a Hydrogen production, final pH and OD₆₀₀ of MJ1 with different DAPSBH concentrations. b Metabolite production of MJ1 with different DAPSBH concentrations. c Hydrogen production with different YE concentrations. The hydrogen production with 2 g/L YE addition was used as the control and defined 100%. d Hydrogen production with different inoculation ratios. The hydrogen production under inoculation ratio of 10% was used as the control and defined 100%