Asked by: Lubica Lindezmedical health infectious diseases
Why must petri dishes containing media be inverted?
Last Updated: 7th May, 2020
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Similarly one may ask, what are two reasons why it is important to invert the petri plates during incubation?
Inverting the petri dish makes it more difficult for contaminants to enter the growing medium. When in the incubator growing cultures, Petri dishes are inverted because moisture condenses on the lid and will drop down onto the agar/growth medium causing moisture problems.
Subsequently, question is, how do you stop condensation on petri dishes? The best luck I have is to pour hot and stack your dishes 15 or so high while pouring. The added heat to the lid form the bottom of the new dish will keep the condensation from forming and also help push some of the moisture laden air out of the dish. Let them cool completely in the stack.
Also to know is, why do we incubate Petri dishes upside down?
5 Plates are incubated upside down (agar up), so that condensation does not drip onto the plate and interfere with the developing microbes.
Why are petri dishes Labelled at the bottom?
The lid of Petri dishes may contain any contamination that spreads on the media and grows with the sample microbes. We label the Petri dishes at the bottom part because lid may exchange with other Petri dishes creating confusion and inverted position makes it easy to read the labeling of Petriplates.