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active transport mechanisms A. GERENCSER AND BRUCE R. STEVENS Physiology, College Medicine, University Florida, Gainesville, Florida 32610 GERENCSER, GEORGE A., AND BRUCE R. STEVENS. Energetits sodium-coupled active transport mechanisms in invertebrate epithelia. Am. J. Physiol. 257 (Regulatory Integrative Comp. Physiol. 26): R461-R472, 1989.-The gradient has been implicated as the soleor primary energy sourcefor accumulative transport organic solutes(e.g., sugars,amino acids) acrossthe mucosalmembrane a variety epithelial cells. A basic question concerning the -coupled transport process in epithelia is whether the energy available from the transmucosal electrochemicaldifference is sufficient to sustain an accumulated organic solute steady-state level. Measurements activities, with -sensitive microelectrodes,gave accurate estimates the electrochemicalpotential difference acrossthe mucosalmembrane Aplysia californica gut. The resultssuggest that the transmucosal gradient can furnish sufficient energy to sustainthe observedintracellular levels the ed species.Many other speciessustain large intracellular-extracellular gradients ( l h. [From Gerencser (26).] 97.3k9.2 2.8t2.3 10.6t8.2 in parentheses. See text for abbreviations. ence (A&. This is expressed by the following equation APS = RZln &/a; (3) where usually ai = [S], for organic solutes. Assuming coupling efficiencies for and the ed electroneutral organic solute to approximate lOO%,then the energetic adequacy the A;N, for accumulative transport the organic solute is expressed as AfiNa A,uS (4)
AJP - Regulatory, Integrative and Comparative Physiology – The American Physiological Society
Published: Sep 1, 1989
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