selective permeability

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selective permeability


differential permeability

the capacity of a membrane to allow some particles to pass through but not others. Such ‘differentially permeable’ membranes (e.g. CELL MEMBRANE, cellular organelle membrane, TONOPLAST) allow water molecules to pass readily through them, whereas solutes dissolved in water can pass less rapidly or not at all. The ability of molecules to travel across the membrane and the velocity with which they do so is dependent on the fat solubility, size, and charge of the molecules. An extreme example of differential permeability is a semipermeable membrane which is almost completely impermeable to solute molecules, but is permeable to the solvent.Such membranes, however, are rare.see ACTIVE TRANSPORT.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
Consecutive values of differential permeability are obtained in intervals given by:
From the differential permeability distributions, the pore number distributions can be obtained by applying the Hagen-Poiseuille model for convective flows.
If [[sigma].sub.i] goes up, the volatility of its normal distribution will be stronger according to the definition of standard deviation, which will finally lead to the large differential permeability distribution, namely, the strong heterogeneity.
We also develop the notion of "differential permeability" as a state of being both integrated and segmented on various aspects of identity and articulate costs and benefits to this state, as well as to high integration and high segmentation.
We also develop the notion of "differential permeability"--a state between the two ends.
Differential Permeability as Middle Ground on the Continuum

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