TABLE 2.

[¹⁴C]acetate and [¹⁴C]bicarbonate assimilation in biofilm cells after incubation for 48 h in the dark^a

Addition(s)	% 14C assimilatedb
	Acetate	Bicarbonate
None	0.54 (0.01)	0.04 (0.00)
5 mM As(V)	0.74 (0.09)	0.12 (0.03)
H2	0.56 (0.12)	0.17 (0.06)
5 mM As(V) + H2	2.56 (0.30)	0.32 (0.07)
5 mM + H2, killed	0.35 (0.10)	0.06 (0.02)
3 mM sulfide	NDc	0.07 (0.02)
5 mM As(V) + 3 mM sulfide	ND	0.41 (0.09)
As(V) + sulfide, killed	ND	0.04 (0.02)

^aAssimilation of [¹⁴C]acetate in the light was 12.7% ± 3.6%.

^bValues in parentheses represent standard deviations of triplicate samples.

^cND, not determined.