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PMID: 4016209 Published · ppublish English Journal Article

Donnan potentials in rabbit psoas muscle in rigor.

Biophysical journal ·Vol. 48 ·No. 1 ·1985-07-00 ·Pages 47-59

Naylor GR, Bartels EM, Bridgman TD, Elliott GF

Abstract

Collins and Edwards (1971, Am. J. Physiol., 221:1130-1133) have shown that a tissue potential can be measured with microelectrodes in glycerinated muscle and that this potential is consistent with a Donnan equilibrium of small ions due to the concentration of net fixed electric charge on the contractile proteins. This approach has been combined with x-ray and light diffraction measurements of the muscle lattice dimensions, and the data are used to determine the thick filament charge and thin filament charge under a variety of different conditions. The thick filament charge is a function of the bathing solution, in particular its pH and ionic composition. These parameters are important in determining the volume of the equilibrium lattice and possibly are involved in the contraction mechanism itself.

MeSH Terms
Animals Hydrogen-Ion Concentration Intercellular Junctions/physiology Membrane Potentials Microelectrodes Models, Biological Muscles/physiology Osmolar Concentration Rabbits Sarcomeres/physiology X-Ray Diffraction
Authors & Affiliations
4 authors, click to expand affiliations / ORCID
Naylor G R
Bartels E M
Bridgman T D
Elliott G F
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Article Info
Journal
Biophysical journal
Abbr.
Biophys J
ISSN
0006-3495
DOI
10.1016/S0006-3495(85)83759-0
Published
1985-07-00
Pages
47-59
Language
English
Region
United States
NLM ID
0370626
PMCID
PMC1329376
Subset
IM
External Links
PubMed source DOI: 10.1016/S0006-3495(85)83759-0 PMC Full Text View journal details
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