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:3/9/2017)... , March 9, 2017 4Dx has ... World Lung Imaging Workshop at the University of Pennsylvania. ... invited to deliver the latest data to world leaders ... event brings together leaders at the forefront of the ... lung imaging. "The quality of the ...
(Date:3/7/2017)... -- Brandwatch , the leading social intelligence company, today announces ... to uncover insights to support its reporting, help direct future campaigns, ... leading youth charity will be using Brandwatch Analytics social listening and ... understanding of the topics and issues that are a priority for ... "Until ...
(Date:3/6/2017)... March 6, 2017 Mintigo , ... today announced Predictive Sales Coach TM , its ... sales intelligence into Salesforce. This unique AI application ... sales organizations with deep knowledge of their customers ... intelligent engagement. Predictive Sales Coach extends Mintigo,s existing ...
Breaking Biology News(10 mins):
Other biology definition