Re: pinhole bio lab

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From: Tory Brady (toryb@exploratorium.edu)
Date: Tue Dec 11 2001 - 11:47:46 PST

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Message-Id: <l03110700b83c11b191b6@[192.174.3.223]>
Date: Tue, 11 Dec 2001 11:47:46 -0800
From: Tory Brady <toryb@exploratorium.edu>
Subject: Re: pinhole bio lab

Dear Geoff-- My experience with this uses gelatin made with phenolpthalein.
(2 packets gelatin, 2 cups hot water, 2 cups cold water and 10ml
phenolpthalein) Cut the cooled gelatin into "cells" and place on
cheesecloth stretched over jars with about 50 ml ammonia in them. The cell
will turn pink. Try different materials other than cheesecloth to see
different permeabilities.
Good luck-- Tory

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