TABLE 1.

Mass spectral data of metabolites identified in extracts of strain AK-01 and a sulfate-reducing consortium grown on protonated or labeled hexadecane that support the mechanism of fumarate addition

Metabolite	Key ions detected under the specified conditionsa
	(A) Protonated conditions for strain AK-01 and a sulfate-reducing consortium	(B) Deuterated conditions for strain AK-01 and a sulfate-reducing consortium	(C) 13C-labeled conditions for a sulfate-reducing consortium
Methylpentadecylsuccinic	486 (M+), 471, 355, 262, 217,	520 (M+), 505, 388, 264, 218,	488 (M+), 473, 357, 358, 262,
acid	172, 147, 73	219, 173, 147, 73	217, 172, 147, 73
4-Methyloctadecanoic acid	370 (M+), 355, 313, 145, 132,	404 (M+), 389, 340, 147, 133,	372 (M+), 357, 315, 145, 132,
	129, 117, 73	130, 118, 73	129, 117, 73
4-Methyloctadec-2,3-enoic	ND	401, 402 (M+), 386, 387, 339,	ND
acid		147, 132, 129, 117, 73
2-Methylhexadecanoic acid	342 (M+), 327, 159, 146, 130,	ND	ND
	117, 73
Tetradecanoic acid	300 (M+), 285, 145, 132, 129,	327 (M+), 312, 149, 135, 132,	300 (M+), 285, 145, 132, 129,
	117, 73	119, 73	117, 73

^aND, not detected.