September 26, 2008 notes
Antibiotics Antiseptics Disinfectants
*can be taken internally *safe to use on skin *used just on inanimate objects
*target cellar parts specific to bacteria *kill all cells by attacking targets common to all cells *more toxic than antiseptics because they are more concentrated
examples of targets common to all cells: examples of disinfects:
phosolipid membrane, proteins, DNA bleach(destroys DNA & proteins)
examples of antiseptics: hydrogen peroxide, alcohol, etc. Lysol(a detergent that destroys lipids)

*I wasn't quite sure where to put this, so I put it in as notes wondering if anyone could help me (us) out. For our 1:10^7 experiment, we had nothing on our 7th plate. I'm wondering if somehow we did not get enough bacteria onto that particular plate, or if it's not completely uncommon to have no bacteria grow whatsoever? We did, however, find too many colonies to count on our 1:1 plate, and estimated that our 1:10^6 plate had approximately 400,000,000 colonies of bacteria growing on it. This is significantly lower that the 1:1 plate, but it still seems like an incredible amount of bacteria.

Also, I thought it was very interesting today when we discussed the exponential growth of bacteria such as E. Coli and S. aureus. I had no idea that there were so many different generation growth periods for different types of bacteria. Where E. Coli takes only 15 minutes to produce another bacteria, it can take up to 24 hours for tuberculosis. Wow! And it's hard to believe that it only takes a day to have billions of individual bacteria growing on a plate. Kind of hard to think about, yet very interesting. :)
-Kelsey

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