TABLE 1.

Comparison of yields for selected Dehalobacter and Dehalococcoides spp. during dehalorespiration

Organism group (culture)aProcessbΔG°cYielddSource or reference
Dehalobacter sp. (MS)1,1,1-TCA→DCA→CA−115.8(7.0 ± 1.5) × 108This study
Dehalococcoides sp. (KB-1/VC)VC→ethene−75.0(2.8 ± 0.7) × 10816
Dehalobacter sp. (WL)1,1,2-TCA→VC−103.1(1.5 ± 1.4) × 10825
Dehalococcoides sp. (WL)VC→ethene−75.0(4.4 ± 1.3) × 10725
Dehalobacter strain TCA11,1,1-TCA→DCA→CA−115.84.0 × 107e45
  • a Except for Dehalobacter strain TCA1, all organisms were in mixed cultures.

  • b Each dechlorination step (indicated by →) requires two electron equivalents. Except for 1,1,2-TCA→VC, all indicated processes result in release of one Cl ion per dechlorination step.

  • c Gibbs free energies of formation based on the work of Dolfing and Janssen (13). Values are kJ/electron equivalents for overall reactions, with H2 used as an electron donor.

  • d Number of 16S rRNA gene copies/μmol electron equivalents reduced.

  • e Assuming that the genome of Dehalobacter strain TCA1 has one copy of the 16S rRNA gene.