(Left) Experimentally measured elemental composition of cell biomass and estimated oxidation state of carbon from the elemental formula.

(Right) Experimentally measured mass ratios of macromolecules relative to DNA. Elemental analysis sources: a elemental composition of R. palustris biomass when grown on malate from Carlozzi and Sacchi [67]; b average elemental composition of Rhodobacter sphaeroides from Waligórska et al. [68], c average elemental composition of Rhodospirillum rubrum growth on acetate from Favier-Teodorescu, et al. [51]; d measurements for R. rubrum in this study.