BSCI 207 Lecture Notes - Lecture 8: Glycerol, Viscosity, Gibbs Free Energy
13 Jan 2016
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X: flux = diffusion coefficient * concentration gradient b, mass, ions, energy diffusion mass mostly relevant for this class, negative sign because movement is opposite to direction of increasing. ; d is diffusion coeff, fraction is concentration gradient. Lecture 8 diffusion: diffusion concentration f. X: can just pay attention to the magnitude of the flux. ; x is the thickness of the cell wall: units of d are cm2/s, d depends on , temperature, size of molecule, properties of medium, spherical molecule d= kt. 6 r viscosity of surrounding fluid: d increases on temperature, d decreases with bigger molecular radius, rate = molecules time. Increasing area: ex: microvilla in small intestine. Increase concentration difference: ex: counter current exchange, decrease thickness of diffusion zone, ex: capillary blood vessels have super thin walls. Increasing temperature iii: decreasing viscosity, decreasing radius of diffusing solute, typically cant change these factors, fick"s second law t= x2 a.
