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Biological membranes

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  1. Introduction
  2. Membrane composition and fluidity
  3. Composition
    1. Membrane carbohydrates
    2. Membrane proteins
    3. Membrane lipids
  4. Membrane fluidity
    1. Fluidity due to lipids
    2. Fluidity due to proteins
  5. Molecular organization of biological membranes, or the structure of biological membranes
    1. Monolayers
    2. Micelles
    3. Bi-layer
    4. Structuration trilaminar
    5. Mosaic structure
  6. Functions of the membrane
    1. Sub-cellular
    2. Exchange between the intra and extra cellular membranes
    3. Support function of enzyme activities
    4. The function of capture and processing power
    5. Function of signal transduction
    6. 6. Function recognition and adhesion between cells
  7. Conclusion

The three main components of biological membranes are carbohydrates, proteins and lipids, and each of them has an important role to play in the functioning of membranes.

The first part of this document will detail the various compounds of the membranes and study their role in its operation. We will discuss the fluidity that is essential for its effective functioning and the factors it depends on. Subsequently we will discuss the molecular organization and structure of biological membranes and see how they can be placed in the monolayer, bi-layer or micelle form. To conclude, the main functions of the membrane will be described.

[...] Conclusion The main components of the membrane proteins are carbohydrates and lipids. These are used in varying amounts depending on the function of the membrane, and are important for the functioning of the cell The flow is necessary for the functioning of the membrane and depends on the bicouche or saturation of fatty acids. Biological membranes such as the bi-layer lipid-mosaic fluid model of Singer and Nicholson (1972) The two main functions of membranes: Compartmentalization (Separation of internal-external environments) Transportation of molecules [...]


[...] These layers are classified into two categories: Multi lamellar: These are characterized by several concentric membranes bounding a cavity of a small diameter. Uni lamellar: The size of these layers varies between 20 nm and 1 micron. These lipid bi-layers tend to form stable discoidal micelles (without water inside). d. Structuration trilaminar In cross section, the electron microscope images reveal a typical structure called tri laminar because it has two dark layers ( 2.5 nm) enclosing a leaflet of clear lipid-protein sandwich. [...]

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