In other to study the features
and the characteristics of micro organism colonies, petri dish is the apex
apparatus used for the task. Petri is shallow, flat and have a large surface
area. These fixtures make it possible growth of organism. Petri dish is always
heat resistant plastic or soda-free glass, they are disposable one and there is
reusable one. They come in different varieties, but the one commonly used is
99mm diameter which is disposable. Petri dish is sterilized in a copper thin.
The copper thin is made up of a deep lid, the deep lip inhibit the escape of
air into the petri dish when cooling. Oven the most laboratory instrument for
sterilization, which is used to sterilized petri dish, the petri dish is place
in the oven at temperature of 160 ºC for one hour, before removing it, it
should be allowed to cool gradually to room temperature.
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