Abstract
Catabolism is tightly coupled to anabolism in substrate-limited cultures. However, the dissolved organic carbon (DOC) distribution between catabolism and anabolism has been hardly studied. Based on a balanced DOC reaction, the DOC distribution between catabolism and anabolism was defined using a ratio of the DOC channeled into CO2 (\(S_{CO_2 } \)) to that DOC converted to biomass (Sg). A \(S_{CO_2 } \)/Sg-dependent growth yield model was proposed for substrate-limited cultures and was verified using the literature data obtained in the oxidative assimilation processes of different types of organic substrates. The model showed that the growth yield (Ys) was proportional to anabolic activity, but was inversely related to catabolic activity. Results indicated that both Ys and \(S_{CO_2 } \)/Sg varied markedly with the free energy of oxidation of the organic substrate. Further, the observed phenomena were closely associated with maintenance metabolism under substrate-limited conditions.
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