Hi,
Petri dishes are incubated in inverted position i.e the plate lid face down and the bottom of the agar face up in order to reduce rate of evaporation which results in proper microbial growth,
I hope this will help.
All the best!
kept streaked plates in inverted position as it will reduces the evaporation rate also minimize the contamination chances.
Agar surface should face down side. This position reduce contamination.
During incubation it is preferable the agar surface being kept in an inverted position (upside down)
1- to reduce contamination and dryness
2- it is esay to handle inverted petri dishes and easy to read the labeling of petri dishes (always at the bottom)
The agar plates should be down or inverted this will reduce water vapour and contamination .
Agar plates should be incubated face down (agar up) to reduce water vapor and possible contamination.
Yes they should be face down. The main reason is that when face up you can get fluid condensation (puddles) on the plate that will interfere with getting distinct colonies. This is reduced when face down.
Mohamed Moustafa Abd El-Razik
prof. Dr. food microbiology
Qassim University
petri dishes for microbiological analysis should be incubated in inverted position those improve the result accuracy.
When the plates are incubated in the normal position, water evaporation from media occurs. These vapors condense on the lid of the Petri dish and drops fall on the colonies developed on the media surface. This causes colony mix-up with each other and spread throughout the plate surface. This creates the problem in counting and proper determination of microbial count.
To reduce cross contamination and dryness agar plate should keep at upside down position in the incubator.
- Badges
- Science topic
- Similar topics
- Biological Science
- Microbiology
- Microorganisms
- Bacteria