Results/Lab Report

UV lab

For questions 2 and 3, use the data from your individual plates.

1.     Can UV penetrate paper?  How about a Petri dish lid?

2.  Did you see a difference in colony growth on the side of the plate that was under the index card compared to the side that was open?  Which one had more?

3. How many colonies did you have on the side of the plate that was exposed to UV light and how many on the side of plate that was covered with the index card?

Data Table

After the class counts their colonies, record the average class data in the table.

UV exposure Time

4. Did one organism survive exposure to UV longer than another?  Why or why not?

5. Would you use UV light to sterilize a syringe packaged in a protective film?  Why or why not?

6. Ionizing radiation is used to treat a number of fresh fruits and vegetables before they are sold to customers.  Why would it be a problem to use UV for this?

Antibiotic lab

For each of your plates, record the name (or abbreviation) of each of your antibiotics.  Then measure the zone of inhibition (the diameter in mm) and place a check in the column under S, I and R.

Depending on the pump that you used, you may have different antibiotics from another group.