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Comparative metabarcoding for bacteria in MFCs operated at different HRTs. (a) A metabarcoding profile for ADE obtained from the AD plant. (b) Metabarcoding profiles for bacteria in MFCs. Sample names indicate anode biofilms (AB), planktonic microbes (PM) and HRT of MFCs (5, 10 and 20 days). Sums of metabarcoding data for the AB fractions in MFCs at HRTs of 5, 10 and 20 days and those for the PM fractions are presented as AB/total and PM/total, respectively.
