Exercise 7: Quantification of Bacteria Flashcards
1
Q
What is the countable range of colonies used to determine a bacterial concentration?
A
Only plates with 25-250 colonies
2
Q
How is Petrifilm different from agar plates?
A
Petrifilm contains a dehydrated medium that is rehydrated with a millimeter of the sample. An agar plate is not a dehydrated medium.
3
Q
What are the advantages of Petrifilm?
A
They are convenient, easy to use, small in size, and are more self-stable
4
Q
What are the limitations of Petrifilm?
A
It is more expensive, its sample is limited to 1 milliliter, and it lacks significant colony morphology
5
Q
How should the CFU/mL values be reported
A
It should be reported with two significant figures in scientific notation.
6
Q
A
