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Gibbs Donnan Equilibrium

- Description -

This animation explains the Gibbs-Donnan equilibrium.  The Gibbs-Donnan equilibrium is a property of solutions and is the electrochemical basis for the unequal distribution of ions and electrical charges across a semi-permeable membrane.  The Gibbs-Donnan equilibrium is a major contributor to the electrical charge across cellular membranes. The video describes solution equilibria and membrane differential permeability, and how the presence of an impermeable ion causes the unequal redistribution of permeable ions. The summary scene presents the Nernst equation for calculating the charge across a membrane based on ion distributions, and solves a sample calculation. The final scene explains the impact of the equilibrium at the membrane level of an intact cell.

Total Runtime: approx. 11 min; 7 scenes

 

Flash (SWF) Format

 

For copies of this video to use in lectures or presentations:

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Flash Format*

$10

Zip File Size - 3.4 MB

(Videos are .swf format)

WMV Format **

$25

Zip File Size -44 MB

(Suitable for PowerPoint)

Apple Quicktime***

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Zip File Size - MB

(Videos are .mov format)

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(Note: all purchased animations play full screen)

*Flash format (.swf) files have full interactivity (start, stop, search forward/back) and scenes are linked and play automatically using the free Flash plug-in from Adobe.

**WMV format scenes do not have interactivity or link between scenes. They are suitable for use in PowerPoint slides. The .wmv format plays in the PC Media Player which allows forward-back search within the scene.

***Quicktime files (.mov) do not have interactivity and scenes are not linked, but the Quicktime player allows foward/back search within a scene.

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Testimonials

I’m a student of medicine from Serbia and just want to thank you for the animation….it’s really very much helpful…. - B.

I'm teaching animal phys., a new course for me. We're just getting into neurophys and the derivation of the Nernst Equation. I found the animations you posted to be helpful in my own understanding, and will use this to help explain the phenomenon to my class. - W.B.

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