Table 1.

Kinetic constants for hydrogen and sulfate uptake ofThermodesulfovibrio sp. strain R1Ha3 andThermodesulfobacterium sp. strain JSP

StrainSulfate kinetics (mean ± SD)Hydrogen kinetics (mean ± SD)
Km(μ M)VmaxaThreshold (μM)ndKm(μ M)VmaxThreshold (atm ) (10−5)nd
R1Ha33.0 ± 1.199 ± 631.8 ± 0.152.4 ± 1.9157 ± 43b1.2 ± 0.73
JSP3.1 ± 1.359 ± 71.9 ± 0.141.9 ± 0.71.9 ± 0.4c0.49 ± 0.33
  • a Expressed as micromoles of sulfate per milligram (dry weight) of cells per hour.

  • b Expressed as micromoles of hydrogen per milligram (dry weight) of cells per hour.

  • c Expressed as nanomoles of hydrogen per 106 cells per hour.

  • d n, number of experiments.