You plated diluted saliva samples on Petrifilms and counted…
You plated diluted saliva samples on Petrifilms and counted the following numbers of colonies for each dilution: Dilution Factor 10-4 10-5 10-6 10-7 10-8 CFU/mL 1089 756 432 244 15 Which dilution factor should you use to calculate the initial CFU/mL of your sample?
Read DetailsWhen we plated our saliva samples on Petrifilms, red dots ap…
When we plated our saliva samples on Petrifilms, red dots appeared after incubation. We counted these dots (colonies) to approximate Colony Forming Units/mL of sample. Does this count tell us the number of living cells or a mixture of living and dead cells and why?
Read DetailsWe isolated unknown microorganisms from our environment by l…
We isolated unknown microorganisms from our environment by leaving a plate open on the first day of class. During our traditional diagnostics lab, we tested our samples for their ability to grow in anaerobic conditions. Some bacteria are able to grow in these anaerobic conditions, what does that mean for their oxygen requirements?
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