If you want to show selective membrane permeability in a visual
manner try this:
Take some Rhoeo discolor leaves. Get sections of the upper half
of the leaf and float on a solution of a weak acid and other sections
on a solution of a weak base. The pigments in this plant change
color with change in pH, and entry of a weak organic acid or a weak base
such as ammonium, over
a few minutes there should be a noticeable change in their color. You
can compare the affect of a strong acid or base (such as NaOH or HCl)
which is too polar to cross the membrane easily.
Scott T. Meissner
Aure Entuluva!
In a message dated 99-09-30 09:47:33 EDT, you write:
<<
good morning, plant-edders.
does anybody know of software that simulates the movement of
molecules through cell membrane? my nonmajors class is having a
very hard time with the fluid mosaic model, and i have the idea that
simulating the passage of molecules, along with making flubber
mosaics in lab, might help.
any ideas will be appreciated.
sandra
>>
