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. 2018 Sep 6;9:2117. doi: 10.3389/fmicb.2018.02117

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Copyright © 2018 Yang, Luo, Kong, Wang, Li, Li, Li, Liu and Xu.

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) and the copyright owner(s) 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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Microbial and DHA activity in chamber 3 of ABR and MFC-ABR. (A,C) Microbial activity of the sludge in MFC-ABR and ABR, respectively; (B,D) microbial activity of the biofilms on carbon fires of MFC-ABR and ABR, respectively. (E) DHA activity of the sludge in different chambers of MFC-ABR and ABR. Green color in (A–D) indicates microbial cells have high metabolism activity and intact cell membrane while red color indicates microbial cells with low metabolism activity and damaged membrane. Scale bar indicates 10 μm.