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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.
The high glucose concentration provides an advantage for the growth of the (osmotically stable) fungi while most bacteria do not tolerate the high sugar concentration. In addition, the low pH is optimal for fungi, but not for many bacteria. 3 Sabouraud Glucose Agar is only slightly selective against bacteria.