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• W1993992511 abstract "The cause of slow freezing injury and the basis of the protection by solutes like glycerol are subjects of debate. During slow freezing, cells are sequestered in unfrozen channels between ice crystals that grow by removing pure water from the channels. As a consequence, the solute concentration in the channels rises and the volume of liquid in the channels progressively decreases. The rise in solute concentration, in turn, causes the cells to progressively shrink osmotically. Until recently cryobiologists have ascribed slow freezing injury to either the rise in solute (electrolyte) concentrations in the channels or to the consequent cell shrinkage, rather than to the decrease in the of the channels. Although ordinarily reciprocally coupled, it is possible to separate the composition of the channels from their size, or more precisely from the magnitude of the unfrozen fraction, by suspending cells in NaCl/cryoprotectant solutions in which the mole ratio of the two is held constant, but the molality of the NaCl is allowed to vary below and above isotonic. When human red cells are frozen in such solutions to temperatures that produce given NaCl concentrations (ms), but varying unfrozen fractions (U), survival at low U is found to be strongly dependent on U but independent of ms. At higher values of U, survival becomes inversely dependent on both ms and U. Although cell volume during freezing is independent of the NaCl tonicity in the solution, the cells in the several solutions differ in volume both prior to the onset of freezing and after the completion of thawing. We have now examined and compared the effect of returning the thawed cells to isotonic solutions and isotonic volume or nearly so, and find that there is little change in survival after exposure to low U, but that survival after exposure to high U values exhibits substantially increased sensitivity to ms, a sensitivity that is probably a manifestation of posthypertonic hemolysis. Low values of U were in general attained by the use of solutions with low tonicities of NaCl, and as a consequence cells frozen to low U values had larger volumes prior to freezing than cells frozen to higher U values. The significance of this confounding is discussed." @default.
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• W1993992511 date "1989-02-01" @default.
• W1993992511 modified "2023-10-02" @default.
• W1993992511 title "Roles of unfrozen fraction, salt concentration, and changes in cell volume in the survival of frozen human erythrocytes" @default.
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• W1993992511 doi "https://doi.org/10.1016/0011-2240(89)90030-8" @default.
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