Donnan equilibrium

Donnan equilibrium
Don·nan equilibrium 'dän-ən- n the ionic equilibrium reached in a solution of an electrolyte whose ions are diffusible through a semipermeable membrane but are distributed unequally on the two sides of the membrane because of the presence of a nondiffusible colloidal ion (as a protein ion) on one side of the membrane
Donnan Frederick George (1870-1956)
British chemist. A university professor for most of his career, Donnan made important contributions as a colloid chemist. Apart from the theory of membrane equilibrium named after him, he did research during World War I on chemical warfare and nitrogen products. He did early research on synthetic ammonia and nitric acid and helped in the development of mustard gas.

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the conditions that exist at equilibrium when two solutions are separated by a membrane permeable to some but not all of the ions of the solutions. There is a complex distribution of the ions between the two solutions, an electrical potential develops between the two sides of the membrane, and the two solutions vary in osmotic pressure. Called also Gibbs-Donnan e. and Donnan effect or e.

Medical dictionary. 2011.

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  • Donnan Equilibrium —  Donnan Equilibrium  Равновесие Доннана (для мембраны), мембранное равновесие   В биологии мембранное равновесие, связанное с различием концентрации солей внутри и вне клеток. Если мембрана с тонкими порами, проницаемыми только для ионов, но не… …   Толковый англо-русский словарь по нанотехнологии. - М.

  • Donnan equilibrium — Donano pusiausvyra statusas T sritis chemija apibrėžtis Pusiausvyra tarp jonų, esančių abiejose puslaidės membranos pusėse arba tarp jonų, esančių tirpale ir jonitinėje membranoje. atitikmenys: angl. Donnan equilibrium rus. доннановское… …   Chemijos terminų aiškinamasis žodynas

  • Donnan equilibrium — An equilibrium established between a charged, immobile colloid (such as clay, ion exchange resin or cytoplasm) and a solution of electrolyte. Characteristics: ions of like charge to the colloid tend to be excluded; ions of opposite charge tend to …   Dictionary of molecular biology

  • donnan equilibrium — ˈdänən noun Usage: usually capitalized D Etymology: after Frederick G. Donnan died 1956 British chemist and physicist : the ionic equilibrium reached in a solution of an electrolyte whose ions are diffusible through a semipermeable membrane but… …   Useful english dictionary

  • Donnan equilibrium (effect) — Don·nan equilibrium (effect) (donґən) [Frederick George Donnan, English chemist, 1870–1956] see under equilibrium …   Medical dictionary

  • Gibbs-Donnan equilibrium (effect) — Gibbs Don·nan equilibrium (effect) (gibzґ donґən) [J.W. Gibbs; Frederick George Donnan, English chemist, 1870–1956] Donnan equilibrium …   Medical dictionary

  • Gibbs-Donnan equilibrium — Donnan e …   Medical dictionary

  • Donnan potential — appears as a result of Donnan equilibrium, named after Frederick G. Donnan, which refers to the distribution of ion species between two ionic solutions separated by a semipermeable membrane or boundary. The boundary layer maintains an unequal… …   Wikipedia

  • Donnan — can refer to: Saint Donnan Frederick G. Donnan, chemist Donnan equilibrium Harry Donnan, Australian cricketer Donnan, Iowa, a community in the United States This disambiguation page lists articles associated with the same title. If an …   Wikipedia

  • Equilibrium — is the condition of a system in which competing influences are balanced and it may refer to:cienceBiology* Equilibrioception, the sense of balance present in humans and animals * Homeostasis, the ability of an open system, especially living… …   Wikipedia

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