Bio 1B Lecture 14 - Bio1BLecture14:WaterRelations...

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Bio 1B Lecture 14: Water Relations Transport of water Two elements Properties of the water molecule (usually tested on mcats) o Razor blade floats on water although it is denser Surface tension of water  Water molecule is polar and forms hydrogen bonds with  itself Cohesion=interaction of water molecules with  themselves o Water also evaporates after the hydrogen bonds break Temperature and the humidity Vapor pressure gradient: a measure of how fast water  will evaporate o Three principals Mass flow= movement of water from a region of high to a region  of low concentration Water potential=way of describing the “strength” with  which water movies ( Ψ = psi) Arbitrary number: pure water is 0 Water potential becomes less than zero when  something dissolved in water Units are atm, bars, megapascals Diffusion= movement of a species from a region of high to low  concentration until species is uniform in its distribution
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This note was uploaded on 05/24/2011 for the course BIO 1B taught by Professor Carlson,mischel,power during the Fall '07 term at University of California, Berkeley.

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Bio 1B Lecture 14 - Bio1BLecture14:WaterRelations...

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