Although the cell can be thought of as a pair of phases, one intracellular and one extracellular, separated by a membrane, the membrane itself can be considered a phase. When the membrane is conceived of as a phase, the cell is described by an extracellular aqueous phase in contact with a lipid phase that contacts another aqueous phase. However, the intracellular environment should probably not be considered as a unitary aqueous phase except in the most unusual of circumstances. The structure of virtually all cells, except the mature mammalian red cell, is composed of multiple membranes and intracellular organelles packed densely together. Each membrane has associated with it two interphase regions, one on each side, representing its association with the phases. The nature of the interphase region associated with biological membranes is an extremely important aspect of the surface chemistry in biological systems and is also exceedingly complex.
KeywordsDouble Layer Zeta Potential Electrophoretic Mobility Diffuse Layer Viscous Force
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