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. 2020 Mar 17;11(1):428–438. doi: 10.1080/21655979.2020.1739405

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© 2020 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 1. — Three-dimensional surface plot and Contour plot for hydrogen yield. The response surface model was obtained by the BBD with the date shown in Table 3. (a) the effect of substrate concentration, inoculation amount and their mutual interaction on hydrogen yield; (b) the effect of substrate concentration, initial pH and their mutual interaction on hydrogen yield; (c) the effect of substrate concentration, enzyme concentration and their mutual interaction on 1hydrogen yield. (d) the effect of inoculation amount, initial pH and their mutual interaction on hydrogen yield. (e) the effect of inoculation amount, enzyme concentration and their mutual interaction on hydrogen yield. (f) the effect of initial pH, enzyme concentration and their mutual interaction on hydrogen yield.