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- W83068226 abstract "The simplest mechanism for cell swelling is termed Donnan swelling in which cells are simply viewed as collections of predominantly anionic macromolecules surrounded by a semipermeable lipid membrane. This is speculated as being the prototypic cell—a spontaneously forming phospholipid bilayer membrane enclosing enough protein and nucleic acids to form a nonequilibrium, self-replicating entity (Tosteson, 1963b). Donnan forces arise because of the principle of electroneutrality. Thus the number of small, presumed membrane-permeable anions such as Cl¯ and HCO3¯ inside the cell is less than outside, where they are the only anions. The membrane-permeant cations inside the membrane generally equal those on the outside. If the membrane were only permeable to the small anions, a Nernstian membrane potential would be set up which in sign (inside negative) and magnitude would exactly oppose the movement of the permeant anions down their concentration gradients into the cells. However, this membrane potential will be reduced (less negative) when the membrane is also permeable to the cations whose equilibrium potential is zero. Thus, this situation is not stable; there will always be movement of cations and anions into the cell because the membrane potential is less negative than needed to balance the net influx of anions and more negative than the cation equilibrium potential. To reach equilibrium, the cell, in theory, will swell until the concentrations of permeable cations and anions inside and outside the cell are equal. However, this will only occur when the cell has swollen to a size that makes the concentration of the impermeant anions vanishingly small." @default.
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- W83068226 date "1999-01-01" @default.
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- W83068226 title "Cell Swelling in Cerebral Ischemia" @default.
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- W83068226 doi "https://doi.org/10.1007/978-1-59259-479-5_3" @default.
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