Bacterial research. Colonies of bacteria growing in a petri dish. The petri dish contains a nutrient medium (such as agar) on which a sample of bacter

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Bacterial research. Colonies of bacteria growing in a petri dish. The petri dish contains a nutrient medium (such as agar) on which a sample of bacteria has been cultured. The amount and size of the bacterial colonies will depend on the agar used and the temperature at which the sample was cultured.

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Photo credit: © CROWN COPYRIGHT/HEALTH & SAFETY LABORATORY/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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