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Fig. 6 | Biotechnology for Biofuels

Fig. 6

From: Application of electric potential improves ethanol production from xylose by active sludge

Fig. 6

Changes of α-diversity indices. Boxplots of α-diversity indices, including the Shannon diversity index, Observed_species, and Chao1 index and PD whole tree. An analysis of variance was performed to test the significance of differences among zones. The symbol ‘□’ represents the average value; the horizontal line in the box represents the median value. Significant differences were analyzed compared with “No potential” in each diversity index sub-graph. Symbols *, ** indicate P < 0.05 and P < 0.01, respectively

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