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22 - Biology Lab Lecture Diffusion-high concentration low...

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Biology Lab Lecture 9/22/08 Diffusion -high concentration low concentration -Molecules tend to change from a state of higher free energy to lower free energy -The charge of state is spontaneous -osmosis: water and semi-permeable membrane -diffusion of water across a selectively permeable membrane down a free energy gradient -substances diffuse down their concentration gradient, the difference in concentration gradient -Water potential -the potential energy of water molecules in relation to pure water -water potential is determined by free (unbound) water molecules in the system -solute reduces water potential; pressure increases water potential water potential=solute potential + pressure potential -water molecules move from regions of higher water potential to regions of lower water potential -Standard reference: pure water at 1 atmospheric pressure -unit megapascal (Mpa) 1 Mps about 10 atm -solutes reduce water potential -solutes bind to water molecules, reducing the amount of free water
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