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. 2014 Nov 13;5:613. doi: 10.3389/fmicb.2014.00613

Figure 3.

Figure 3

Stable carbon isotope values of CH4 and CO2 products of 13C-labeled and non-labeled experiments where 13C-labeled bicarbonate, and organic acids were added to each treatment where K represents a killed control, L represents a live experiments, and 13C represents where 13C-labeled substrate was added. The errors bars are the standard deviations of averages of duplicate experiments.