excretion half-life

См. также в других словарях:

• Half-life (disambiguation) — Half life is a mathematical and scientific description of exponential decay.Half life may also refer to: * Biological half life, pertaining to organisms (also refers to elimination half life , a pharmacokinetic parameter in medicine) ** Effective …   Wikipedia

• Biological half-life — For other uses, see Half life (disambiguation). The biological half life or elimination half life of a substance is the time it takes for a substance (for example a metabolite, drug, signalling molecule, radioactive nuclide, or other substance)… …   Wikipedia

• Effective half-life — denotes the halving of radioactive material in a living organism by means of radioactive decay and biological excretion. A decay constant is needed to calculate the half life. It is the sum of the biological and physical decay constants, as in… …   Wikipedia

• Context-sensitive half-life — or context sensitive half time is defined as the time taken for blood plasma concentration of a drug to decline by one half after an infusion designed to maintain a steady state (i.e. a constant plasma concentration) has been stopped. The context …   Wikipedia

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• Life Sciences — ▪ 2009 Introduction Zoology       In 2008 several zoological studies provided new insights into how species life history traits (such as the timing of reproduction or the length of life of adult individuals) are derived in part as responses to… …   Universalium

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• drug — drug1 /drug/, n., v., drugged, drugging. n. 1. Pharm. a chemical substance used in the treatment, cure, prevention, or diagnosis of disease or used to otherwise enhance physical or mental well being. 2. (in federal law) a. any substance… …   Universalium