Medical Dictionary

Donnan equilibrium

noun Don·nan equilibrium \ˈdän-ən-\

Medical Definition of DONNAN EQUILIBRIUM

:  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

Biographical Note for DONNAN EQUILIBRIUM

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.
April 19, 2015
desiccate Hear it
to dry up or become dried up
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