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Gloved hand of a researcher holding a petri dish
Petri dish. Gloved hand of a researcher using forceps to place a grid on an agar plate in order to grow colonies of bacteria as part of a water purity check. The agar plate (white disc) is an ideal nutrient for growing colonies of bacteria. A water sample is placed on the the disc and the grid can be used for the counting of the resulting bacteria colonies. These colonies can be removed and analysed.
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