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.
Individual microorganisms placed on the plate will grow into individual colonies, each a clone genetically identical to the individual ancestor organism (except for the low, unavoidable rate of mutation). Thus, the plate can be used either to estimate the concentration of organisms in a liquid culture or a suitable dilution of that culture using a colony counter, or to generate genetically pure cultures from a mixed culture of genetically different organisms, using a technique known as "streaking". In this technique, a drop of the culture on the end of a thin, sterile loop of wire, sometimes known as an inoculator, is streaked across the surface of the agar leaving organisms behind, a higher number at the beginning of the streak and a lower number at the end. At some point during a successful "streak", the number of organisms deposited will be such that distinct individual colonies will grow in that area which may be removed for further culturing, using another sterile loop.
Other articles related to "agar plate, agar":
... The bacteria are then allowed to grow on an agar plate containing a culture medium ... The bacteria grow and produce colonies on the agar jelly ... A piece of filter paper can be placed onto the top of this agar plate so that the exact positions of the colonies are remembered ...
... Knop agar Knop agar is used to culture axenically protonema and whole moss plants, e.g ...
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