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Forums The Undercurrent it's literally just biology

Voltie Posted 7 years ago ( 2019/08/18 21:22:53 )
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Apoplastic route - water/solutes move along continuum of cell walls and extracellular spaces

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Voltie Posted 7 years ago ( 2019/08/18 21:23:00 )
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Symplastic route - water/solutes move along the continuum of cytosol (thru plasmodesmata)

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Voltie Posted 7 years ago ( 2019/08/18 21:23:06 )
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Transmembrane route - water/solutes move out of one cell, across cell wall, into next cell

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Voltie Posted 7 years ago ( 2019/08/18 21:23:14 )
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Selective permeability of plasma membrane, active/passive transport, pumps/transport proteins

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Voltie Posted 7 years ago ( 2019/08/18 21:23:23 )
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H+ ions play primary role in basic transport (short-distance)

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Voltie Posted 7 years ago ( 2019/08/18 21:23:31 )
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Proton pumps pump H+ out of plant cells to establish membrane potential

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Voltie Posted 7 years ago ( 2019/08/18 21:23:40 )
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H+ cotransporter - movement of sugar/ion against its concentration gradient is coupled with movement of H+ down its electrochemical gradient (loads sucrose into phloem, nitrates into roots)

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Voltie Posted 7 years ago ( 2019/08/18 21:23:47 )
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Gated ion channels open/close in response to chemicals, pressure, or voltage

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Voltie Posted 7 years ago ( 2019/08/18 21:23:55 )
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Produce electrical signals (like animal action potentials), using Ca2+-activated ion channels

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Voltie Posted 7 years ago ( 2019/08/18 21:24:04 )
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Water potential (Ѱ) - predicts movement of free water by osmosis (high → low)

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Voltie Posted 7 years ago ( 2019/08/18 21:24:14 )
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Includes effects of solute concentration and physical pressure

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Voltie Posted 7 years ago ( 2019/08/18 21:24:21 )
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Measured in megapascals. Ability of free water to do work

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Voltie Posted 7 years ago ( 2019/08/18 21:24:28 )
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Pure water in a container open to the atmosphere under standard conditions (sea level, room temp) has Ѱ = 0 MPa

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Voltie Posted 7 years ago ( 2019/08/18 21:24:35 )
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Internal pressure of a living plant cell due to osmotic uptake of water = 0.5 MPa

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Voltie Posted 7 years ago ( 2019/08/18 21:24:48 )
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Water potential equation: Ѱ = ѰS + ѰP

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Voltie Posted 7 years ago ( 2019/08/18 21:24:56 )
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Solute/osmotic potential (ѰS) - directly proportional to molarity, always negative

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Voltie Posted 7 years ago ( 2019/08/18 21:25:03 )
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As solute concentration increases, ѰS decreases (more negative)

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Voltie Posted 7 years ago ( 2019/08/18 21:25:10 )
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Pressure potential (ѰP) - physical pressure on a solution, positive or negative relative to atmospheric pressure

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Voltie Posted 7 years ago ( 2019/08/18 21:25:18 )
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Water in living cells is under positive pressure to osmotic uptake of water

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Voltie Posted 7 years ago ( 2019/08/18 21:25:25 )
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Protoplast (living part of cell and plasma membrane) presses against cell wall → turgor pressure

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