Biological membrane

In medicine, microbiology, cellular physiology and biochemistry a membrane is a lipid bilayer that acts as boundary to various cellular structures.

Some biological membranes define an enclosed chemical reaction space, partitioning the inside of the enclosed structure from outside influences, and vice-versa (e.g., the membrane of peroxisomes isolates the cell from peroxides).

Many organelles are largely defined by the existence of such membranes.

See also : cell membrane