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Efficiency of Energy Conversion by Aerobic Glucose Metabolism in Aphanocapsa 6714

Laboratory of Chemical Biodynamics, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720

ABSTRACT

Efficiency of adenosine triphosphate (ATP) formation from glucose oxidation in Aphanocapsa 6714 was estimated by quantitative measurement of phosphorylated intermediary metabolites and glycogen (polyglucose) formed from ¹⁴C-glucose. P/2e ratios based on oxygen uptake ranged from 2.62 to 3.08, whereas those based on ¹⁴CO₂ evolution ranged from 1.66 to 1.72. The synthesis of glycogen, which is the dominant energy-consuming process in resting cells exposed to exogenous glucose, was almost totally inhibited under anaerobic conditions, and the cellular concentration of ATP decreased steadily. Thus, both net synthesis of ATP and the steady-state concentration of ATP are obligatorily linked to respiration in this heterotrophic unicellular blue-green alga.