Discontinuous volume transitions induced by calcium–sodium ion exchange in anionic gels and their neurobiological implications | Zendy

Tasaki I. | Zendy; Byrne P. M. | Zendy

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Discontinuous volume transitions induced by calcium–sodium ion exchange in anionic gels and their neurobiological implications

Author(s) -

Tasaki I.,

Byrne P. M.

Publication year - 1994

Publication title -

biopolymers

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.556

H-Index - 125

eISSN - 1097-0282

pISSN - 0006-3525

DOI - 10.1002/bip.360340207

Subject(s) - chemistry , membrane , isotonic , swelling , sodium , ion exchange , calcium , salt (chemistry) , conductance , volume (thermodynamics) , ion , biophysics , inorganic chemistry , chromatography , chemical engineering , thermodynamics , organic chemistry , biochemistry , medicine , physics , mathematics , combinatorics , biology , engineering

Discontinuous volume transitions in poly(acrylic acid) gels were studied by determining equilibrium swelling curves of small gel beads immersed in salt solutions containing varying concentrations of Ca 2+ and Na + . Reversible contractions of gel membranes associated with Ca 2+ ‐Na + exchange were examined using both isometric and isotonic recording devices. A discontinuous change in electric conductance was demonstrated in association with Ca 2+ ‐Na + exchange in gel membranes. These experimental findings provide a sound physicochemical basis for elucidating the mechanism of nerve excitation. © 1994 John Wiley & Sons, Inc.

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