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Encyclopedia > Membrane
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A membrane is a thin, typically planar structure or material that separates two environments. Because it sits between environments or phases and has a finite volume, it can be referred to as an interphase rather than an interface. Membranes selectively control mass transport between the phases or environments. Image File history File links Please see the file description page for further information. ... The flux visualized. ...

Biological membranes include: A biological membrane or biomembrane is a membrane which acts as a barrier within or around a cell. ...

Artificial membranes are used in: Drawing of a cell membrane A component of every biological cell, the cell membrane (or plasma membrane) is a thin and structured bilayer of phospholipid and protein molecules that envelopes the cell. ... The mucous membranes (or mucosae; singular: mucosa) are linings of ectodermic origin, covered in epithelium, and are involved in absorption and secretion. ... An artificial (synthetic) membrane is a membrane prepared for separation tasks in laboratory and industry. ...

Theoretical membranes are used in: Reverse Osmosis is the process of forcing a solvent from a region of high solute concentration through a membrane to a region of low solute concentration by applying a pressure in excess of the osmotic pressure. ... The article is about the separation process. ... Microfiltration is a filtration process which removes contaminants from a fluid or gas by passage through a microporous membrane. ... Ultrafiltration is a filtration process in chemistry that can retain solutes with relative molecular masses in the order of 100s to 1000s. ... Pervaporation is a method for the separation of mixtures of liquids by partial vaporization through a non-porous membrane. ... In medicine, renal dialysis is a method for removing waste such as urea from the blood when the kidneys are incapable of this (i. ...

  Results from FactBites:
membrane. The Columbia Encyclopedia, Sixth Edition. 2001-05 (265 words)
Membrane organization is based on a sheet two molecules thick—a double layer of lipids aligned with their long hydrocarbon tails tucked inside—studded with protein molecules, some of which extend completely through the lipid bilayer.
The basic function of the membrane is to provide for the integrity of the cell—e.g., to separate the outside from the inside.
In this case, specific membrane proteins called receptors bind hormones or other such informational molecules and subsequently transmit a signal to the interior of the cell.
  More results at FactBites »



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