process in development of a multicellular organism by which cells become specialised for particular functions. Requires that there is selective expression of portions of the genome, the fully differentiated state may be preceded by a stage in which the cell is already programmed for differentiation but is not yet expressing the characteristic phenotype determination.
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... topic The equation you are looking for is Fick's equation http://www.tiem.utk.edu/bioed/webmodules/diffeq1.gif So ignore the differentials, the dc is the difference of concentration, the dx is the memberane thickness. The math is so simple that it explains itself.
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