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- W2034281164 abstract "The boundary potential and the membrane potential of microplasmodia of Physarum polycephalum were measured in the presence of electrolyte ions and chloroform and the results were analyzed with the aid of a new membrane model. The Donnan potential and the membrane potential, relative to the potential value at an ionic strength of 0.005, increased in manners quite similar to each other as the ionic strength of the medium increased, suggesting that the diffusion potential of microplasmodia was not noticeably affected by the variation in the ionic strength. K+ ion and Na+ ion seemed to exert influence dissimilarly on the diffusion potential because these two monovalent cations were found to affect differently the Donnan potential and the membrane potential of microplasmodia. As the concentration of Ca2+ ion or Mg2+ ion increased, the surface charge density calculated from the surface potential decreased steeply and reversed its sign after passing through the point of zero charge, due to the adsorption of the divalent cation to microplasmodia. The binding constants of Ca2+ and Mg2+ ions were evaluated to be 125 and 167 M−1, respectively. In contrast to the monovalent cations, the divalent cations caused no appreciable change in the diffusion potential of microplasmodia. The Donnan potential as well as the membrane potential of the model cells exhibited a sudden change of about 12 mV when 0.2 mM chloroform was added to the medium. This was interpreted as showing that the inhalation anesthetic caused a phase transition in the cell membrane." @default.
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- W2034281164 date "1989-06-01" @default.
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- W2034281164 title "Boundary potential and membrane potential of Physarum polycephalum: effects of electrolyte ions and chloroform" @default.
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