Sun tanning

group of molecules used as vitamin

class of skin illnesses, tumor or cancer of the skin

Sunburn is a form of radiation burn that affects living tissue, such as skin, that results from an overexposure to ultraviolet (UV) radiation, usually from the Sun. Common symptoms in humans and other animals include red or reddish skin that is hot to the touch or painful, general fatigue, and mild dizziness. Other symptoms include blistering, peeling skin, swelling, itching, and nausea. Excessive UV radiation is the leading cause of (primarily) non-malignant skin tumors, which in extreme cases can be life-threatening. Sunburn is an inflammatory response in the tissue triggered by direct DNA d

the darkening of skin in response to ultraviolet light

measurement of strength of sunburn-producing ultraviolet (UV) radiation

human disease

syndrome where an individual has a dependence on sunbathing or the use of tanning beds

damage to the skin or other biological tissue caused by exposure to radiation

thumb|Photoaging of a woman.

visible differences in skin color due to tanning

Formation of pyrimidine dimers in DNA due to UVB exposure

caused by UV-photons

Photoprotection is the biochemical process that helps organisms cope with molecular damage caused by sunlight. Plants and other oxygenic phototrophs have developed a suite of photoprotective mechanisms to prevent photoinhibition and oxidative stress caused by excess or fluctuating light conditions. Humans and other animals have also developed photoprotective mechanisms to avoid UV photodamage to the skin, prevent DNA damage, and minimize the downstream effects of oxidative stress.