Isolation of urea-decomposing bacteria in the soil Aquatic heat-resistant bacteria Taq (Thermus aquaticus) High-temperature-resistant Taq DNA polymerase American Microbiology Department Brook (T. Brock) 1966 found that heat-resistant bacteria selection medium in microbiology, will allow specific A medium for the growth of various types of microorganisms while inhibiting or preventing the growth of other types of microorganisms. Theoretical basis for counting the number of colonies: When the dilution of the sample is high enough, a colony growing on the surface of the culture medium is derived from a live bacteria in the sample dilution. Therefore, proper dilution is the key to successfully count the number of colonies. In order to ensure the accuracy of the results, the bacterial solution at several dilutions is usually coated on the plate, and after cultivation, the plate with a colony number of 30 to 300 is selected for counting.
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