Do sunscreens and sunglasses really work to block damaging UV rays? Your class treats the lid of a Petri dish containing a sun-sensitive yeast strain with sunscreen or covers part with sunglasses, leaving part exposed to ultraviolet wavelengths from the sun. After incubating the plate, students can gauge the effects of the sun on the yeast cells, applying their findings to humans as well. Other simple experiments explore additional factors such as the angle of the sun, ozone depletion, and air pollution. You get enough materials for 24 students. Note: Coupon included for perishable materials. Redeem by mail, fax, phone, or e-mail.
Materials Included
•2 Bottles, YED agar, 125 mL
•12 Petri dishes
•12 Test tubes w/caps, sterile
•12 Sterile swabs
•15 Alcohol wipes
•24 Sterile pipets
•1 Bottle, sterile water, 125 mL
•1 Tube, sterile water, 9 mL
•1 Coupon redeemable for: Culture UV-sensitive yeast w/agar slant
Materials Needed But Not Provided
•Heavy paper, dark tape, or other lightproof material
•Sunscreen, sunglasses, or other UV protected materials for testing
•30ºC incubator
Time Requirement
•45 Minutes
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