Because during incubation moisture will form at the top of the petri dish. Inverting the dish prevents it from dropping into whatever you have in the petri dish.
This inversion prevents moisture condensing on the surface of the plate. That would make a problem in that the growth on the plate would be "distorted" by the water making ID more difficult.
to prevent condenstion of the gel
Wrapping an agar plate in paper before incubation helps to prevent moisture condensation on the lid of the plate which could potentially cause contamination. The paper acts as a barrier to reduce the chances of any external contaminants entering the plate during incubation.
The Petri dish was named after German bacteriologist Julius Richard Petri, who invented it in the late 19th century while working in Robert Koch's laboratory. Petri dishes are commonly used in microbiology for culturing bacteria and other microorganisms.
When streaking a plate, you are really trying to reduce the number as you go along. If you overlap, you will pickup more. What you want finally, is one or two separate colonies.
This inversion prevents moisture condensing on the surface of the plate. That would make a problem in that the growth on the plate would be "distorted" by the water making ID more difficult.
to prevent condenstion of the gel
Wrapping an agar plate in paper before incubation helps to prevent moisture condensation on the lid of the plate which could potentially cause contamination. The paper acts as a barrier to reduce the chances of any external contaminants entering the plate during incubation.
This is to stop condensation from forming on the top of the lid. Condensation causes two problems (1) It will allow contamination to enter into the dish by moving accross the water film from the outside (2) It can create a tight seal and prevent oxygen entering the petri dish making it go anerobic.
Bacteria love to grow in moist damp places - if you haven't noticed, condensation causes water droplets to form on the top of the lid and if you incubated the plate with lid on top when the water runs down the sides of the plate it can easily contaminate your culture.
A shallow plate which is used in a science lab is known as a petri dish.
Carefully.
An agar plate is a specific type of Petri dish that contains a solid growth medium called agar. Petri dish is a broader term that refers to any shallow, flat, circular dish used in microbiology experiments. The key difference is that an agar plate contains agar as a solid medium for microbial growth, while a Petri dish can be used with various types of media, including agar.
The clumps of growth are called colonies.
A petri dish is a shallow, round glass or plastic dish used to hold agar, a gel-like substance that provides nutrients for growing microorganisms. An agar plate is a petri dish containing agar with added nutrients and is used to culture and grow specific microorganisms for study. The main difference is that an agar plate contains nutrients specifically tailored for the growth of certain microorganisms, while a petri dish may not contain any added nutrients.
If media splashes up the side of a petri plate, it can result in contamination from the outside environment or other plates. It may also affect the growth of the culture as the splashed media can mix with the top agar layer. To prevent inaccurate results and contamination, it is best to discard the petri plate.
some sense