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In general, a membrane is a barrier layer that has varying degrees of permeability for particles of different sizes.
Subject - analytical chemistry
Technical membranes are filters that allow for the separation of particles in the 0.1-10 µm size range.
Subject - cell biology
Biological membranes (cell membranes) are flexible double layers with thicknesses of 6-10 nm that surround all cells and many of their organelles.
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Cell Structure and Cell Organelles
60 min.
BiochemistryBiological FundamentalsCell Morphology
Cytology is introduced by means of illustrations, animations, and a comprehensive collection of references and selected links.