The Challenge: Make an Antibacterial Cream
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Where do we get
the bacteria from?
Bacteria can be found
both in and on our bodies but one of the most accessible and populated
areas is the mouth. By wiping sterile swabs around the inside of the mouth,
placing the saliva into a small bottle of enrichment media (the nutrient
broth), and incubating them at body temperature for an hour, the colony
will begin to grow. Just a small drop of this enrichment culture spread
on the surface of some nutrient agar in a Petri dish will produce colonies
of bacteria if they are kept in an insulated box.
What do you think
you would see if you had the ideal concentration of bacteria?
Rollover the dishes below to find out.
How can we kill bacteria?