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. 2015 Feb 4;6:37. doi: 10.3389/fmicb.2015.00037

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Copyright © 2015 Ungerfeld.

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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Response of the heat of combustion in volatile fatty acids (ΔH_VFA) to metabolic hydrogen incorporated into CH₄ ([2H]_CH4). Individual responses are adjusted by their experiment effect (exp): (A) Batch cultures: y = 2664 (±103; p < 0.001) + exp (p < 0.001) + 0.162 (±0.156; p = 0.30) x + exp × x (p = 0.06); R² = 0.93 (p < 0.001); (B) Continuous cultures: y = 53.9 (±1.91; p < 0.001) + exp (p < 0.001) + 0.29 (±0.077; p < 0.001) x; R² = 0.72 (p < 0.001).