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Ever wanted to grow bacteria for a science project or just for fun? This article will show you how to grow them in a petri dish.
- Buy some agar or prepared petri dishes and keep them up side down until you need them. Do not open the petri dish until you use it.
- Open the lid and do one of the following:
- Press your finger against the agar jelly.
- Place a hair in the dish.
- Place a drop of milk or watered down yoghurt in the dish.
- Replace the lid quickly to avoid contamination.
- Tape the lid shut.
- Place it in a warm environment for a few days. (A window ledge facing the sun or an airing cupboard would be good places for this)
- Keep it at 35 degrees celcius (95 fahrenheit) for optimum growth.
- You can create comparisons by spliting the dish into sections and placing something different in each section.
- Speak to your science teacher about disposing of the dish.
- Never put anything in the dish which is likely to grow into dangerous bacteria (bodily fluids should never be placed on a petri dish). If the dish is reopened it could cause serious illness.
- Never reopen the petri dish.
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