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Phosphate metabolism during muscular contraction in starved frogs ( Rana catesbeiana )

Comparative Biochemistry and Physiology Part A: Physiology, ISSN: 0300-9629, Vol: 106, Issue: 4, Page: 725-729
1993
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1.1. The muscle tension and the state of high-energy phosphate metabolism during contraction of the sartorius muscle in frogs (Rana catesbeiana) starved for 1–5 months was studied by in vivo31P-NMR spectrometry.2.2. Muscle tension began to decrease after 2-month starvation compared with the control group and decreased to about one-third of the control value after a 5-month starvation.3.3. Muscle contraction induced by electrical stimulation or the use of anaerobic perfusion fluid did not decrease the concentration of creatine phosphate (PCr) or β-ATP, and only negligibly changed the PCr/Pi ratio from starvation.4.4. These results suggest a decrease in creatine kinase activity in the muscle of starved frogs.

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