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discussion_2008_02_01

# discussion_2008_02_01 - Discussion Problem set 2...

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Discussion Problem set 2 Electrical/chemical potential energy Ion concentration differences across membranes Nernst equation Non equilibrium Permeability, flux Ordinary differential equations

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Problem set 2, question 2 Energy = (Planck’s constant) x (frequency) Speed = (frequency) x (wavelength)
Problem set 2, question 3 Look up damped oscillator Viscous drag force proportional to velocity Spring force proportional to displacement m kx F spring - = x F drag Γ - = x m F =

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Damped oscillator km 2 Γ = ζ m k = 0 ϖ 0 2 2 0 0 = + + x x x ζϖ ζ and ω 0 should not necessarily appear in your solution to question 3
Reynolds number Ratio of inertial forces to viscous forces Low Reynolds number indicates no turbulence viscosity dominates over momentum

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E out E in in out out in c c zF RT E E E ln ) ( = - = Electrical potential energy per unit charge measured in Volts For calcium ions, z = 2 For chloride ions, z =-1
in out out in c c zF RT E E E ln ) ( = - = E out E in Suppose the cell membrane is permeable to Ca 2+ ions, and [Ca 2+ ] is 2.718 mM outside the cell and 1 mM inside the cell. What is the potential difference across

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discussion_2008_02_01 - Discussion Problem set 2...

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