bio lect 13

bio lect 13 - water movement lect 13 Part 1:properties of...

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water movement: lect 13 Part 1:properties of teh water molecule Part 2: pumping system = pathway H2O - slighty polar. O neg. H plus and polar ends make bonds between sperate H20s creating surface tension. Surface tension = cohesion. - evaporates: liquid -> Gaseous phase ; vapor pressure gradient 3 Principles govern movement in all living things 1) mass flow - overall movement of water from a region of high concentration to a region of low concentration. Water potential - Psi - potential of water to move from a region of high to low conc. - psi of pure water by definition = 0(zero) anything dissolved in water making it less pure lowers the water potential. because pure water is zero, all other psi other than pure are negative numbers. Solutes - species of chemicals dissolved in water. PSI /s π (salt added water) 2) diffusion - movement of any species from a region of high to low conc until the conc is the same. if the diffusing species is water, then diffusion and mass flow is the same.
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This note was uploaded on 05/10/2010 for the course BIO 1B taught by Professor Carlson,mischel,power during the Spring '07 term at Berkeley.

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bio lect 13 - water movement lect 13 Part 1:properties of...

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