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Isotopic composition of bulk propane (gray diamonds), terminal position (blue circles), and central position (red triangles) of the remaining propane (1 − f) during the course of anaerobic propane oxidation by the sulfate-reducing bacterium Desulfosarcina sp. strain BuS5. Fractionation factors (ε, ‰) are calculated according to the slope of the line. εbulk = 12.8‰ ± 0.8‰; εterminal = 2.8‰ ± 0.2‰; εcentral = 33‰ ± 2‰. Error bars are smaller than the plotted symbols.
