Semipermeable Membrane

Definition: Semipermeable Membrane

Semipermeable Membrane

Noun

1. A membrane (as a cell membrane) that allows some molecule to pass through but not others.

Source: WordNet 1.7.1 Copyright © 2001 by Princeton University. All rights reserved.
 

Crosswords: Semipermeable Membrane

This image represents the equilibration of osmotic stress among the phase under study and the external stressing solution in vast excess across a semipermeable membrane. At equilibrium the osmotic pressure of the stressing solution is identical to the osmotic pressure stressing the subphase.Credit: NICHD.

As the external osmotic pressure stresses the subphase, water (as well as small solutes) is exchanged across the semipermeable membrane. The free energy change connected with the water exchange is equal to the osmotic work.Credit: NICHD.

Osmotic stress can be generated even when no semipermeable membrane is present to define the subphase. This happens when there are regions of steric exclusion of the stressing polymer. Every region of steric exclusion feels the osmotic stress generated by the excluded polymer.Credit: NICHD.

Schematic presentation of the system DNA + salt + counterions + PEG at an equilibrium across a semipermeable membrane. The membrane is impermeable to PEG and DNA. There is however no obstruction to the motion of small ions (Picture courtesy H.H. Strey, NIH).Credit: NICHD.

Source: compiled by the editor from various references; see credits.

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