1.   But because ultraviolet radiation is a constant feature of solar radiation, the ozone layer is maintained.

2.   However, ultraviolet radiation must also have aided evolution.

3.   If ozone deterioration persisted, they warned, solar ultraviolet radiation would flood Earth.

4.   In his own private laboratory, he worked with ultraviolet radiation at the ultimate resolution of the optical microscope.

5.   Large areas, including the United States, continue to get increasingly harmful ultraviolet radiation.

6.   No animal or plant can withstand ultraviolet radiation in more than modest amounts.

7.   The satellite, called Astron, is intended to study ultraviolet radiation and X-rays from celestial objects.

8.   Those early genera that survived had a built-in immunity to ultraviolet radiation, thus helping in the struggle for continued survival.

9.   Ultraviolet radiation could do the same job as the electrical discharge in their laboratory.