| high energy phosphate bond |
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 frequency blood group |
a group containing over 99 per cent of individuals, who have a type of erythrocyte antigens called public antigens.
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| Hill coefficient |
a coefficient occurring in the Hill equation, indicating the degree of cooperativity of the enzyme being examined; a Hill coefficient of 1.0 indicates independent binding while greater and lesser values indicate positive and negative cooperativity, respectively. The value for hemoglobin is 2.8.
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| Hirano bodies |
glassy, eosinophilic, rod-shaped inclusions, composed primarily of actin, seen in the cytoplasm of neurons of the central nervous system, chiefly the hippocampus, particularly in older persons; although they may occur in the absence of disease, they are more prevalent in patients with neurodegenerative disorders such as Alzheimer's disease.
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| HIV encephalopathy |
HIV-related encephalopathy, a progressive primary encephalopathy caused by human immunodeficiency virus type I infection; it involves principally the subcortical white matter and deep gray nuclei and is manifested by a variety of cognitive, motor, and behavioral abnormalities. Called also AIDS dementia complex, AIDS e., and HIV encephalitis.
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