TABLE 1.

Disproportionation of thiosulfate by D. thermobenzoicum in the presence and absence of acetate^ac

Substance added	Amt (μmol) of:				Growth (ΔOD600)b	Ratio (sulfate/sulfide)
	Thiosulfate used	Sulfite formed	Sulfate formed	Sulfide formed
S2O32−	26.4 ± 1.7d	0.5 ± 1.0	24.9 ± 3.1	23.8 ± 2.5	0.05	1
Acetate + S2O32−	145.5 ± 10.6e	9.8 ± 9.8	135.4 ± 21.3	168.7 ± 5.3	0.11	0.8
Acetate	BDLf	BDL	BDL	0.4 ± 0.4	0.0	NAg
S2O32− (no cells)	2.7	BDL	BDL	BDL	0.0	NA

^aIncubated at 62°C for 7 days in basal medium with 15 mM thiosulfate. 

^bOD₆₀₀, optical density at 600 nm. 

^cValues represent the mean and standard deviation of triplicate determination. 

^d101% sulfur recovery when sulfur recovered as iron sulfides is included; elemental sulfur was not detected. 

^e107% sulfur recovery. 

^fBDL, below detection limit. 

^gNA, not applicable.