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The Challenge: Make an Antibacterial Cream



We are nearly ready to collect our bacteria. We have agar on which bacteria can grow, suitable nutrients and a bug-friendly environment but there is one last step before catching the bugs themselves: all equipment that could be in direct contact with the bacteria or the media has to be sterilized.

The best methods of sterilization are autoclaving and baking in an oven. Metal equipment such as tweezers, wire loops and spoons are sterilized before use by dipping them into 70% ethanol (or powerful rum!) and setting them alight.

Finally, it's time to catch some bacteria.

Catching bacteria