Bacteria
are a fascinating type of microorganism that play a large role in our
lives whether we like it or not. Try growing your own sample of bacteria
while monitoring how it reproduces in a short space of time. Compare
your original sample with others and get proof that bacteria truly are
everywhere!
What you'll need:
- Petrie dish of agar
- Cotton buds
- Some old newspaper (to wrap petrie dish when disposing)
Instructions:
- Prepare your petrie dish of agar.
- Using your cotton bud, swab a certain area of your house (i.e. collect a sample by rubbing the cotton bud on a surface of your choice).
- Rub the swab over the agar with a few gentle strokes before putting the lid back on and sealing the petrie dish.
- Allow the dish to sit in a warm area for 2 or 3 days.
- Check the growth of the bacteria each day by making an observational drawing and describing the changes.
- Try repeating the process with a new petrie dish and swab from under your finger nails or between your toes.
- Dispose of the bacteria by wrapping up the petrie dish in old newspaper and placing in the rubbish (don't open the lid).
What's happening?
The agar plate and
warm conditions provide the ideal place for bacteria to grow. The
microorganisms on the plate will grow into individual colonies, each a
clone of the original. The bacteria you obtained with the cotton bud
grows steadily, becoming visible with the naked eye in a relatively
short time. Different samples produce different results, what happened
when you took a swab sample from your own body?
You will find
bacteria throughout the Earth, it grows in soil, radioactive waste,
water, on plants and even animals too (humans included). Thankfully for
us, our immune system usually does a great job of making bacteria
harmless.
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