A shallow dish used to culture microorganisms in a laboratory.A petri dish is a shallow, flat, transparent cylindrical container with a lid, used in biology to culture microorganisms such as bacteria, fungi, and small plants. It provides a sterile, controlled environment where cells can grow on a nutrient medium, typically agar. The dish is named after Julius Petri, who invented it in 1887 while working as an assistant to Robert Koch.
Invented by Julius Petri in 1887, it replaced the earlier method of growing bacteria on glass plates, making it easier to handle and stack.
The dish is filled with a layer of agar gel containing nutrients. A sample is introduced onto the surface, and the lid prevents contamination while allowing gas exchange. The transparent material lets researchers observe colony growth without opening the dish, maintaining sterility.
Used in microbiology labs for isolating and identifying pathogens, testing antibiotic sensitivity, and producing vaccines.
The petri dish is also used in physics experiments, such as studying the crystallization patterns of drying droplets, which can reveal properties of the dissolved substances.
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