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half-life
half‐life
A Dictionary of Food and Nutrition
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2005
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© A Dictionary of Food and Nutrition 2005, originally published by Oxford University Press 2005. (Hide copyright information)
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half‐life 1. The time taken for half the
protein or tissue in question to be replaced. Proteins are continuously degraded and replaced even in the mature adult, and the half‐life is used as a quantitative measure of this ‘dynamic equilibrium’. The values of half‐life of different proteins range from a few minutes or hours for
enzymes which control the rate of metabolic pathways, to almost a year for structural proteins such as collagen. The average half‐life of human liver and serum proteins is 10 days, and of the total body protein, 80 days.
2. Of radioactive isotopes, the time in which half the original material undergoes radioactive decay.
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