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. 2015 Nov 30;6:1337. doi: 10.3389/fmicb.2015.01337

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Copyright © 2015 Li, Rui, Yao, Zhang, Yan, Wang, Yan and Li.

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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The principal coordinates analysis (PCoA) plots of the bacterial communities in 20 independently-operated full-scale anaerobic digesters. Bray-Curtis distance was used for the PCoA analysis. Plots were ranked by (A) substrate type, and (B) free ammonia content (FA, mgl⁻¹).