| high energy b. |
a chemical bond the hydrolysis of which yields high levels of free energy; such bonds involve phosphate (high energy phosphate b.) or sulfur (high energy sulfur b.) or other mixed anhydride types of chemical structures.
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| high energy c.’s |
compounds containing high energy bonds (q.v.); because they yield high levels of free energy on hydrolysis, the compounds are basic to the energy supply of living organisms. Important classes include acid anhydrides (e.g., adenosine triphosphate, aminoacyl adenylates), enol phosphates (e.g., phosphoenolpyruvate), thioesters (e.g., acetyl coenzyme A), and phosphagens (e.g., phosphocreatine). Called also energy rich c's.
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| high energy phosphate b. |
a high energy bond containing phosphate, occurring in ATP, phosphocreatine, phosphoenolpyruvate, and other phosphate-containing high energy compounds; see high energy compounds, under compound. The energy released on hydrolysis of the bond can be transferred, stored, or used to drive metabolic processes such as the synthesis of glycogen from glucose.
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| high energy sulfur b. |
a high energy bond containing sulfur, occurring particularly in a variety of thioesters that are high energy compounds (q.v.); the most important such bond is that of the metabolic intermediate acetyl coenzyme A. The energy released by hydrolysis of a high energy sulfur bond can be transferred, stored, or used to drive metabolic processes such as the biosynthesis of fatty acids.
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| high f. |
see forceps delivery, high, under delivery.
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