> On Thu, Feb 12, 2009 at 3:15 PM, sgt york <jv...@yahoo.com
> > Thanks...I hadn't thought of the yeast one. I like that idea. I've
> > shown my kids the DNA extraction trick, they think it's pretty neat,
> > but they didn't fully understand it. The biggest problem with it is
> > that I think most of the kids won't really have a grasp of what DNA
> > is. Doesn't mean I can't teach them, though!
> > Maybe have some blueprints....hmmm....I might be able to come up with
> > something there, like a secret code (according to my daughter, secret
> > codes are *totally* in right now). Brainstorming here...Just came up
> > with this as I was typing.
> > 1) A sheet of paper with a DNA sequence on it. AGGCTTAAGGCCCAATTT
> > 2) A set of blocks with complimentary "codons" on one side, and a
> > letter on the other.
> > 3) A list of rules "A pairs to T, G pairs to C, read from left to
> > right.
> > 4) Line up the "decoder" blocks with the sequence, and you get a
> > secret message.
> > Does that make sense at all?
> > Then extract DNA..."this is the secret code of life." Might be
> > cool.....I'll try it out on my kids first. See if they get it.
> > Any thoughts? Modifications? I think it would be better if instead of
> > a secret message, the work actually built something, more like real
> > translation. Maybe different shaped blocks that you put in order?
> > Science night isn't until March, so I have time to prepare stuff.
> > So far, I've got (1) Extract DNA from strawberries (2) swab, heat fix
> > & stain buccal cells to look at them under a microscope (3) Cultured
> > yeast at different temps (4) Make pH strips from cabbage, test
> > different household stuff for pH, maybe do a little titration (5)
> > Chromotography with coffee filters & food coloring
> > That's a lot, but some will probably get nuked by the science teacher.
> > I may combine the yeast & pH strips; get some yeast fermenting and
> > show them the pH drop. However, that may get nuked as well....I guess
> > I'd technically be teaching 3rd graders how to make alcohol. Probably
> > not a good idea....
> > Thanks!
> > On Feb 11, 4:34 pm, mostromundo <mzuor...@gmail.com
> > > I taught a simple lab showing the effect of temperature on yeast
> > > metabolism using some pretty cheap supplies, it's just a bioreactor (a
> > > plastic bottle in this case) full of grape juice (or whatever) and
> > > fermenting yeast, with a stopper in the top with a tube inserted
> > > through it that lets the carbon dioxide generated move out of the
> > > reactor and into a little beaker of water where you can see it
> > > escaping as bubbles. The warmer the temperature, the faster the yeast
> > > metabolize the sugar and the more CO2 is generated. It takes a little
> > > tweaking to get it to work right, but you could have a couple of
> > > different reactors going at different temperatures and have the kids
> > > figure out that the warmer ones were going faster, or something like
> > > that. Let me know if you want to know more and I can send you the
> > > procedure I wrote for the class.
> > > On Feb 11, 12:20 pm, sgt york <jv...@yahoo.com
> > > > I just got an e-mail from my daughter's science teacher announcing a
> > > > planning session for science day coming up in March. The first
> > > > planning session is next week, and I'd like to go in with some ideas.
> > > > This is for kids age 5-12, and needs to be fairly quick; 5-10 minutes
> > > > is ideal. I'd like it to be interactive and unusual. I've got a few
> > > > ideas, but more ideas can't hurt, biology is usually underrepresented
> > > > in favor of physics, chemistry, and engineering (don't get me
> > > > started), and I'd like to change that this year.