chemical half-life

chemical half-life — chemical half life. См. химическое время полужизни [мРНК]. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

Half-life — (h[aum]f l[imac]f ), n. (Physics) the time it takes for one half of a substance decaying in a first order reaction to be destroyed. For radioactive substances, it is the time required for one half of the initial amount of the radioactive isotope… …   The Collaborative International Dictionary of English

Half-life — This article is about the scientific and mathematical term. For other uses, see Half life (disambiguation). Number of half lives elapsed Fraction remaining Percentage remaining 0 1/1 100 1 1/2 50 2 …   Wikipedia

half-life — (= t1/2) The period over which the activity or concentration of a specified chemical or element falls to half its original activity or concentration. Typically applied to the half life of radioactive atoms but also applicable to any other… …   Dictionary of molecular biology

half-life — /ˈhaf laɪf / (say hahf luyf) noun the time required for one half of a sample of unstable material to undergo chemical change, as the disintegration of radioactive material, the chemical change of free radicals, etc …   Australian English dictionary

half-life — noun a) The time required for half of the nuclei in a sample of a specific isotope to undergo radioactive decay. Most books of scholarship have surprisingly short intellectual half lives during which they make a difference b) In a chemical… …   Wiktionary

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

Reaction half life — The reaction half life in chemical kinetics describes the time needed for half of a reactant in a chemical reaction to be depleted. It is the same as the nuclear half life involved in nuclear decay, which is a first order reaction.ee also main… …   Wikipedia

List of creatures in the Half-Life series — The following is a list of creatures from the Half Life universe.Creatures from XenXen is where the majority of the aliens in Valve s Half Life series originate.VortigauntGargantuaThe Gargantua, nicknamed Garg , is mostly blue in color, has a… …   Wikipedia

Creatures in the Half-Life series — The following is a list of creatures in the Half Life series. Half Life is a science fiction first person shooter computer game series which consists of two full games, two episodic games, and three third party made expansions, as well as a… …   Wikipedia

Locations of Half-Life — The Half Life series of video games features many locations set in a dystopian future stemming from the events of the first game, Half Life. These locations are used and referred to throughout the series. The locations, for the most part, are… …   Wikipedia