Showing bacteria in contaminated water
Reid Harvey - Monday 22 May 2006
Klaas and others,
This is just a thought, but I've heard a couple of people talk about chasing E. coli around, using a small silver wire. I did not take in the specifics, but I wonder if it would be possible to fix the silver in position, within the field of vision, then move the water sample around, in search of the E coli.
I would think this would entail a slight separation between the silver and the slide, but that the silver would be within the water. Somehow this might be do-able.
Reid
Glitter Germs
Jalmandir, Michael Lea - Monday 22 May 2006
Glitter Germs
In response to [Klaas van der Ven 1885] invisible germs.
Hello Klaas,
Alternative exercise to simulate invisible bacteria presence .... Let each women rub a little lotion on their hands and then pour some glitter (the glitter represents germs) into the palm of one hand. Then allow them to go about their regular activities. This will give the glitter a chance to spread around the room. Then discuss. Afterwards wash / dry hands and discuss those results. You can get the same results with grounded up chalk or colored fluorescent chalk. An excellent exercise for invisibility (my favorite) would be glow-in-the-dark powder exposed by a blacklight. If cost is a concern, use "sticky" cold cooked rice.
Hope this is helpful. Cheers!
Source: [http://www.teachnet.com/lesson/health/germs041999.html]
