A contaminant is anything other than the organism(s) you were trying to grow. This question is a little like asking what plants are weeds and there is no 100% true answer. The purpose of a streak...
It is recommended that plates that should be counted should be between 30 and 300 McCance and Harrigan (1992). When more that 300 colonies you cant count them with great accuracy and represented with...
Pour plating is a method of separating one species of bacteria from another by diluting one loopful of organism into three liquefied nutrient agar plates, with the hopes that one of the plates poured...