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. 2015 Jan 15;5:778. doi: 10.3389/fmicb.2014.00778

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Copyright © 2015 Siegert, Li, Yates and Logan.

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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Coulombs transferred (A) and coulombic efficiency (CE) compared to CH₄ recovery efficiency (CRE, both B) as a function of original inoculum size with bog and anaerobic digester sludge (AD) after 3 fed-batch cycles.