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Agar plate. An agar plate is a Petri dish that contains a growth medium (typically agar plus nutrients) used to culture microorganisms or small plants like the moss Physcomitrella patens. Selective growth compounds may also be added to the media, such as antibiotics.
TSI agar medium was developed based on Kligler's iron agar, which had been used for the determination of lactose fermentative bacteria, by addition of sucrose to be able to detect sucrose fermentative bacteria also.