TABLE 1.

Comparison of compound-specific carbon isotope enrichment factor ɛ to the ɛ_intrinsic calculated for the carbon atoms at the molecular site of the reaction of the respective substrate^a

Bacterial strain or culture	Substrate	ɛ	ɛintrinsic	Reference
Thauera aromatica	Toluene	−1.7	−11.9	17
Geobacter metallireducens	Toluene	−1.8	−12.6	17
Sulfate-reducing strain TRM1	Toluene	−1.7	−11.9	17
Desulfobacterium cetonicum	Toluene	−2.2	−15.4	18
Sulfate-reducing enrichment culture	Toluene	−0.8	−5.6	1
Methanogenic enrichment culture	Toluene	−0.5	−3.5	1
Sulfate-reducing strain OX39	m-Xylene	−1.8	−14.4	This study
Sulfate-reducing strain OX39	o-Xylene	−1.5	−12.0	This study
Desulfobacterium cetonicum	m-Cresol	−3.9	−27.3	This study
Desulfobacterium cetonicum	p-Cresol	−1.6	−11.2	This study
Sulfate-reducing enrichment culture	2-Methylnaphthalene	−0.9	−9.9	9
Avg		−1.67 ± 0.86	−12.3 ± 5.8

^aAverage and ± standard deviations were calculated from the sum of all data presented in the table.