11.   Sun creams work by blocking harmful ultraviolet radiation.

12.   ...the green fluorescence it gives off under ultraviolet radiation.

13.   The shortest wavelengths are grouped into wavebands called gamma rays, X-rays and ultraviolet radiation.

14.   Ultraviolet radiation damages DNA in plants.

15.   The economic consequences for food crops and other plants of the resulting increase in ultraviolet radiation have received less attention.

16.   John Frederick, leader of the Chicago team, said it was not clear how the increased ultraviolet radiation had affected the population.

17.   Two Australian scientists have developed a chemical process which significantly increases the ability of clothing to act as a barrier against ultraviolet radiation.

18.   And the magnetic type would not use chlorofluorocarbons, which eat away ozone in the upper atmosphere that protects Earth from harmful ultraviolet radiation.

19.   Andrew Blustein of Oregon State University is looking at the possibility that some species lack a natural defense against ultraviolet radiation, making them vulnerable where ozone is depleted.