what is the value of petri in microbiology?

Answer 1

A Petri dish is a shallow glass or plastic cylindrical dish that biologists use to culture cells, which can be bacteria, animal, plant, or fungus. Glass Petri dishes can be re-used by dry heating in a hot air oven at 160 degrees for one hour, while the plastic Petri dishes must be disposed of after use. For microbiology, agar plates are very frequently used. The dish is partially filled with warm liquid agar along with a particular mix of nutrients, salts and amino acids and, optionally, antibiotics. After the agar solidifies, the dish is ready to receive a microbe-laden sample (although to grow some microbes it is often necessary to apply the sample with the hot agar). As well as making agar plates, empty Petri dishes may be used to observe plant germination, small animal behaviour, or for other day-to-day laboratory practices such as drying fluids in an oven and carrying and storing samples.