Abstract
Oxidative assimilation of dissolved organic carbon (DOC) includes the interrelated processes of catabolism and anabolism. It has been demonstrated that energy uncoupling is a dominant characteristic of substrate-sufficient batch culture. However, the interrelationship of DOC distribution between catabolism and anabolism to the observed growth yield (\iY\Dobs\N) has not yet been clear for substrate-sufficient batch cultures. In this study, the DOC distribution between catabolism and anabolism was described using a ratio of the DOC channeled into carbon dioxide (\iS\DCO2\N) to the DOC converted into biomass (\iS\dg). Based on a balanced oxidative reaction of DOC, a \iS\DCO2\N/\iS\i\dg-dependent \iY\Dobs\N model was developed for substrate-sufficient batch culture, and was verified with experimental and literature data. The model showed a reducing trend of growth yield an increasing \iS\DCO2/\iS\i\dg ratio. It appears that the imbalance between catabolism and anabolism induced by substrate excess leads to non-growth-associated DOC consumption, which is responsible for the observed reduction of \iY\Dobs\N under substrate-sufficient conditions.
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