Although their tans may fade after the sunbathing season, the ultraviolet damage to their skin accumulates year after year after year.

Until now, scientists have believed that some plants are more susceptible than humans and other animals to ultraviolet damage.

The major difference in the effect of ultraviolet and X-rays is that skin is largely opaque to ultraviolet, and therefore protects internal tissues from ultraviolet damage.

When ultraviolet light damages skin tissue, an enzyme called metalloproteinase is produced.

While both changes have the same effect, the fact that there are both single and double changes would be the signature of ultraviolet damage.

Parents and anyone else who cares for children must be sure they play it safe in the sun and develop lifelong habits that will protect their skin from ultraviolet damage.

National Institute of Environmental Health Sciences grant to study ultraviolet light damage and its effect on mutagenesis - $2 million.

It would resist ultraviolet damage much better, with the planet's thin ozone layer.

Some research supports the assumption that it may protect body tissues from oxidative and ultraviolet damage through its suppression of NF-κB activation.

However, plastics may also be less resistant to ultraviolet damage and may become brittle over time, resulting in cracking.