Quiz 6 - Bacterial Enumeration
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9 Terms
What does CFU stand for?
Colony-forming unit
What is the purpose of serial dilutions?
decrease the concentration of bacteria for easier counting
What is the countable range for bacterial enumeration?
30-300 colonies
What does the spectrophotometer measure in bacterial enumeration?
optical density/turbidity
What are some examples of DIRECT bacterial counting methods?
microscope
hemocytometer
What is an example of a VIABLE bacterial counting method?
Plate count method
What is an example of an INDIRECT bacterial counting method?
turbidity via spectrophotometer
What is the best method for visualizing both live and dead bacterial cells?
Microscope count using a hemocytometer with cell staining
Why is measuring the turbidity of a sample no a direct measure of viable cells?
Measures the total cell mass, including dead cells
Note 
Flashcards (57)