Navigation Links
Lipid bilayer


A DPPC bilayer simulation
Color scheme: PO4 = green, N(CH3)3 = violet, water = blue, terminal CH3 = yellow, O = red, glycol C = brown, chain C = grey

In biology and chemistry, a lipid bilayer is a membrane or zone of a membrane composed only of lipid molecules. The lipid bilayer is the foundation of all biological membranes, and is a prerequisite of cell-based life.

Within a critical range of concentrations, certain kinds of lipids alone in a test tube of water will self-organize to form a "bilayer". The bilayer is composed of two opposing layers of lipid molecules arranged so that their hydrocarbon tails face one another to form the oily bilayer core, while their electrically charged or polar heads face the watery or "aqueous" solutions on either side of the membrane.

Because of the oily core, a pure lipid bilayer is permeable to small hydrophobic solutes but has only a very low permeability barrier to inorganic ions and other hydrophilic molecules. Water itself is an exception to this rule, and crosses freely.

Other self-organizing structures that lipids assume, depending on their concentration and type, include micelles, monolayers and vesicles. Cholesterol molecules in the bilayer assist in regulating fluidity.

See also


'"/>


(Date:12/19/2014)... VEGAS , Dec. 18, 2014   LaunchKey , ... for the post-password and Internet of Things era, today ... funding. The venture round was led by Metamorphic Ventures ... Rimrock Venture Partners, VegasTechFund, and others.  LaunchKey has raised ...
(Date:12/17/2014)... 16, 2014 Research and Markets ( http://www.researchandmarkets.com/research/9zq33j/global_chemical ... Chemical Sensor Market 2015-2019" report to their offering. ... One major trend upcoming in this market is the ... sensors help in recording of patient data for quick ...
(Date:12/11/2014)... Dec. 10, 2014  That blood pressure plays a role in ... – the medical term for high blood pressure – was ... the inflatable cuff that,s used in measuring blood pressure was ... nothing new about hypertension, its triggers and its effects. In ...
Breaking Biology News(10 mins):LaunchKey Raises $3 Million in Additional Funding Led by Metamorphic Ventures 2LaunchKey Raises $3 Million in Additional Funding Led by Metamorphic Ventures 3Global Chemical Sensor Market 2015-2019: Key Vendors are Abbott Laboratories, Bayer, Hoffmann La-Roche, Johnson & Johnson, NGK Spark Plugs and Robert Bosch 2Research points to need for new approaches to treatment of high blood pressure 2Research points to need for new approaches to treatment of high blood pressure 3Research points to need for new approaches to treatment of high blood pressure 4
... Amsterdam, November 17, 2009 Brain imaging can offer a ... A study conducted at the University of Kansas School of ... of even those who are healthy, but carry some risk ... the November 2009 issue of the Journal of Alzheimer,s ...
... Two University of New Hampshire assistant professors ... Early Career Development (CAREER) grants. Vaughn Cooper of ... received $1 million to better understand beneficial mutations ... data collection. Christopher White of the mechanical engineering ...
... available in German . , Scientists from ... Munich, Germany, have now deciphered the mechanism that illustrates how ... car, these cells have an engine, a clutch and wheels ... group leader at the MPI of Biochemistry. The results, which ...
Cached Biology News:2 UNH faculty receive $1.4M in CAREER grants from NSF 2Cross-country runabouts -- immune cells on the move 2
Other biology definitionOther Tags