Petri Dishes are essential lab materials used for growing and studying cultures. Not sterile.
Glass and Plastic Petri Dishes
A Petri dish (or Petri plate or cell culture dish) is a shallow glass or plastic cylindrical lidded dish that biologists use to culture cells or small moss plants. Glass Petri dishes can be reused by sterilization (for example, in an autoclave or by dry heating in a hot air oven at 160 °C for one hour). For experiments where cross-contamination from one experiment to the next can become a problem, plastic Petri dishes are often used as disposables. Petri dishes are often used to make agar plates for microbiology studies. The petri dish is partially filled with warm liquid containing agar and a mixture of specific ingredients that may include nutrients, blood, salts, carbohydrates, dyes, indicators, amino acids and antibiotics. After the agar cools and solidifies, the petri dish is ready to receive a microbe-laden sample in a process known as inoculation or "plating." For virus or phage cultures, a two-step inoculation is needed: bacteria are grown first to provide hosts for the viral inoculum.
Apart from being used as biological laboratory equipment, Petri dishes are also used in school and college laboratories to teach children about various biological concepts. Petri Dishes are transparent laboratory equipment. This allows younger children to learn and see growth that happens when they want to see how a seed develops into a little plant.
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