Sign in to make a comment Sign in to your personal account. View Article Google Scholar 6. Due to the fact that the L p for endoosmotic flow is near 0, the rate of that endosmosis is greatly slowed down. V b refers to the absolute volume of the intracellular space occupied by lipids, proteins, carbohydrates, and bound water that is tightly hydrogen-bonded to the hydrophilic surfaces of these molecules. Subsequently the average diameters were converted into cell volumes. Journal List J Physiol v.
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The light solid line is the simulated curve obtained by calculating the cell volumes as a function of time using the classical differential equation [Eq 3]. In hypotonic solutions, the cells swell with time as water flows into the cell. By employing the technique of immersion refractometry to measure volume changes, a study has been made of the rate of entry of water into chick heart fibroblasts cultured in a fluid medium. That time was 25—40 s. The permeability of a cell to water is usually referred to as the hydraulic conductivity, L p. In the swelling experiments, the cell volumes in the first image were 1.
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The observed dehydration of ova cooled to subzero temperatures at given rates is approximately predicted by the mathematical model, although there is some quantitative discrepancy between the observed and calculated responses. The question is which is responsible for this difference — the direction of water flow or the difference in the external osmolality? That is true for all three temperatures. The most prominent finding of this study is the dependence of the water permeability coefficient L p on the direction of the water flow in or out of the cell, a phenomenon known as rectification. It is the volume of solids and nonosmotic water in the cell.