Kinetics of sulfate and hydrogen uptake by the thermophilic sulfate-reducing bacteria Thermodesulfobacterium sp. strain JSP and Thermodesulfovibrio sp. strain R1Ha3

Half-saturation constants (K-m), maximum uptake rates (V-max), and threshol d concentrations for sulfate and hydrogen were determined for two thermophi lic sulfate-reducing bacteria (SRB) in an incubation system without headspa ce. K-m values determined for the thermophilic SRB were similar to the cons tants described for mesophilic SRB isolated from environments with low sulf ate concentrations.