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THE KINETICS OF PENETRATION : I. EQUATIONS FOR THE ENTRANCE OF ELECTROLYTES

Osterhout, W. J. V.
Fonte: The Rockefeller University Press Publicador: The Rockefeller University Press
Tipo: Artigo de Revista Científica
Publicado em 20/11/1929 Português
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When the only solute present is a weak acid, HA, which penetrates as molecules only into a living cell according to a curve of the first order and eventually reaches a true equilibrium we may regard the rate of increase of molecules inside as See PDF for Equation where PM is the permeability of the protoplasm to molecules, Mo, denotes the external and Mi the internal concentration of molecules, Ai denotes the internal concentration of the anion A- and See PDF for Equation (It is assumed that the activity coefficients equal 1.) Putting PMFM = VM, the apparent velocity constant of the process, we have See PDF for Equation where e denotes the concentration at equilibrium. Then See PDF for Equation where t is time. The corresponding equation when ions alone enter is See PDF for Equation. where K is the dissociation constant of HA, PA is the permeability of the protoplasm to the ion pair H+ + A-, and Aie denotes the internal concentration of Ai at equilibrium. Putting PAKFM = VA, the apparent velocity constant of the process, we have See PDF for Equation and See PDF for Equation When both ions and molecules of HA enter together we have See PDF for Equation where Si = Mi + Ai and Sie is the value of Si at equilibrium. Then See PDF for Equation VM...