They exposed the buttocks of 33 people to artificial sunlight and tested how active the gene was before and after exposure to ultra violet rays.
22.
The violet ray was suggested independently by two museum curators after they were given victims'descriptions of one of the several electrical devices used by Burge.
23.
Each was wearing a baseball cap, protection of at least a part of the body from the cancer-causing ultra violet rays of the Australian sun.
24.
As a plant physiologist, he studied the absorption of carbon dioxide by plants and the effect of artificial light, especially ultra violet rays, on plants.
25.
The flowers, which have bluish violet ray florets and pale yellow disc florets that eventually turn purplish, emerge in summer and persist into the fall.
26.
Only ultra-violet rays can destroy them, and unleashing such light waves in the presence of coalition vampires puts a good deal of strain on the alliance.
27.
Biologists blame grading and filling for crops, pastures, houses and stream channeling, as well as pollution, planting of non-native fish in rivers and possibly ultra-violet rays.
28.
This form of vinyl strapping has great recovery when stretched, the colors are sharp and clear, and its protection from ultra violet rays is very good.
29.
Each plant can produce a flat-topped array of 5-50 flower heads, each head with 12 35 blue or violet ray florets surrounding 48 55 yellow disc florets.
30.
In addition to parasites, pollution, pesticides, deforestation, ultra-violet rays and the loss of wetlands have been suggested as why the ancient and amazingly adaptable frog is now threatened.
