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. 2014 Feb 6;4:3998. doi: 10.1038/srep03998

Figure 7. Biogas production from the microalgal biomass substrate after photobiological H2 production.

Figure 7

(a) The detected total biogas volume of the blank sample and the sample with algal biomass as a substrate. (b) The gas composition (H2 and CH4) analysis during the anaerobic digestion stage. Error bars indicate the s.d. values that were calculated from the average of triplicate experiments.