Table 3. Acetylene-reduction rates in Japanese faecal samples.

Sample ID	Time between sampling and assaya (h)	Acetylene reduction rates (nmol/g/h)
		Unfrozen	Frozen
N001-1b	8	1.390 ± 0.237	0.472 ± 0.109
N001-2b	6	1.608 ± 0.422	0.954 ± 0.010
N002	8	0.660 ± 0.403	N. A.
N003	15.5	0.466 ± 0.117	0.049 ± 0.034
N004	16.5	0.331 ± 0.127	0.082 ± 0.055
N005	27	0.055 ± 0.010	N. A.

^aTime between defecation and the addition of acetylene to the unfrozen samples or freezing (the frozen samples).

^bN001-1 and N001-2 were sampled from the same individual (N001) on different days.