TABLE 3.

In situ rates of product formation after microinjection of H¹⁴CO₃⁻ into the major gut sections of agarose-embedded hindguts of Cubitermes spp. incubated under air or an H₂ atmosphere^a

Termite species	Incubation atmosphere	Product	Formation rate (nmol gut−1 h−1)
			P1	P3/4a	P4b
C. umbratus	H2	Acetate	—b	0.65	0.31
		Formate	—	—	—
C. orthognathus	Air	Acetate	—	0.12	—
		Formate	0.09	—	—
	H2	Acetate	0.05	0.69	0.22
		Formate	0.36	0.18	—

^aC. orthognathus was fed with fresh soil 24 h before the measurements. C. umbratus guts did not form any products when incubated under air (see text). 

^b—, below the detection limit (0.02 nmol section⁻¹ h⁻¹).