Studies on the Respiratory Physiology of Euglena gracilis Cultured on Acetate or Glucose |
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Authors: | B HEINRICH J R COOK |
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Institution: | Department of Zoology, University of Maine, Orono, Maine |
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Abstract: | SYNOPSIS. The glyoxylate cycle operates at a high level in Euglena gracilis when acetate is the only carbon source, and at a low level when glucose is the only carbon source, as indicated by activities of malate synthase. Altho glucose causes a moderate repression of some of the enzymes of the glyoxylate cycle, it neither represses nor inhibits malate synthase. The specific activity of the malic enzyme was about 5-fold greater in acetate-grown Euglena than in glucose-grown cells, but the absolute rate of CO2 fixation was about twice as great in cells grown on glucose. The respiratory quotient was unity regardless of substrate. |
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