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chemiosmosis

British  
/ ˌkɛmɪɒzˈməʊsɪs /

noun

  1. biochem the mechanism by which the synthesis and utilization of the biochemical energy source ATP is regulated: the energy generated by oxidative phosphorylation generates a proton gradient across the membrane of the mitochondrion that drives the enzymic resynthesis of ATP

  2. a chemical reaction between two compounds after osmosis through an intervening semipermeable membrane

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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.