Petri Dish Applications
Petri dishes ensure uniform cell growth and easy microscopic analysis of cell structure, viability and development during in vitro studies. Dishes can vary in their set-up: treated or non-treated for cell attachment, multi-welled for easy comparison and graduated for locating a specific specimen. Dishes can also be aseptic, sterile or non-sterile, but are usually always supplied with well-fitting lids to prevent contamination. Any growth area size requirements can be accommodated, as dishes vary widely in diameter. It is also possible to purchase vented dishes for better air flow.
Use with Agar
Petri dishes are often used with an agar-based medium (supplemented with antibiotics, amino acids, nutrients, etc.) for microbiology studies involving bacteria or small mosses. The dishes are also suitable for eukaryotic cell culture in liquid media (or solid agar), in preparation for experiment set-up. Agar plates (dishes plated with agar) should be stored upside-down to prevent infection from condensation which forms on the lid.
Petri dishes can be reused after sterilization via an autoclave. However, plastic (polystyrene) dishes are quite often disposed of to minimize the chances of contamination.