concentration gradient

concentration gradient

noun Chemistry.
the gradual difference in concentration of a dissolved substance in a solution between a region of high density and one of lower density.
Also called density gradient.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Concentration gradient is always a great word to know.
So is mitosis. Does it mean:
movement of molecules across a membrane from high to low concentration assisted by proteins
method of cell division by the resolving of the chromatin of the nucleus into a threadlike form
WordNet
concentration gradient

noun
a gradient in concentration of a solute as a function of distance through a solution; "the movement of a solute down its concentration gradient is called diffusion" 
WordNet® 3.0, © 2006 by Princeton University.
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