TABLE 3

Theoretical growth yields per mole of electrons

EquationProcessReduction half reactionGrowth yield (no. of cells/mol e)Reference
1NO2 reduction to NH4+0.16 NO2 + 1 e + 4.33 H+ → 0.16 NH4+ + 0.33 H2O2 × 1013aR. A. Sanford, unpublished data
2Fe(III) reductionFe3+ + 1 e → Fe2+6.0 × 1012b28
3N2O reduction0.5 N2O + 1 e + 1 H+ → 1/2 N2 + H2O2.4 × 1013b17
4Chemodenitrification1.5 × 1013This studyc
  • a Based on Anaeromyxobacter dehalogenans strain R cell enumeration with flow cytometry.

  • b Based on published numbers [1.4 mg biomass/mmol Fe(III) and 11.2 mg biomass/mmol N2O] and a weight of 2.4 × 10−13 g per bacterial cell.

  • c Theoretical calculation based on the reduction of 0.5 mol Fe(III) and 0.25 mol N2O [produced by chemical reaction between NO2 and Fe(II)].