how does uv damage cells?
36795
Ultraviolet (UV) light kills cells by damaging their DNA. The light initiates a reaction between two molecules of thymine, one of the bases that make up DNA.
279361
UVB radiation burns the upper layers of skin (the epidermis), causing sunburns. UVA radiation is what makes people tan. UVA rays penetrate to the lower layers of the epidermis, where they trigger cells called melanocytes (pronounced: mel-an-oh-sites) to produce melanin. Melanin is the brown pigment that causes tanning.
590521
UVA rays can penetrate clouds, and they can also reach below the water's surface. UVB rays can also damage your skin year-round, cloudy or not, especially at high altitudes where there's less atmosphere to absorb ultraviolet radiation.
1453752
Relative to UVA rays, UVB rays have shorter wavelengths and higher energy levels. UVB rays damage the outermost layers of the skin. They directly damage DNA. UVB rays cause most skin cancers, but they can also contribute to skin aging prematurely.
1311241
UV lamps produce light radiation from ultraviolet through visible to infrared radiation. The biggest hazard comes from the UVR. UVR cannot be seen and is not felt immediately, but it is harmful to both the eyes and skin. The user may not realize the danger until after the exposure has caused damage.
1250173
UV radiation has enough energy to break chemical bonds. Due to their higher energies, UV photons can cause ionization, a process in which electrons break away from atoms.
296842
Ultraviolet (UV) light destroys the molecular bonds that hold together the DNA of viruses and bacteria. UV light is a particularly good option for sanitation because it kills bacteria regardless of drug resistance and without toxic chemicals.
255273
Ultraviolet radiation (UVR) is defined as the portion of the electromagnetic spectrum between 100 nanometers (nm) and 400nm. ... UVA - Ultraviolet radiation in the range 315nm to 400nm is thought to contribute to premature aging and wrinkling of the skin and has recently been implicated as a cause of skin cancer.
1135329
Direct DNA damage can occur when DNA directly absorbs a UVB photon, or for numerous other reasons. UVB light causes thymine base pairs next to each other in genetic sequences to bond together into pyrimidine dimers, a disruption in the strand, which reproductive enzymes cannot copy. ... thymine dimers.
774673
UV light causes chemical reactions in the body When the energy from UV radiation is absorbed by DNA, it can cause reactions that lead to genetic mutations. ... UV light induces the body to synthesize other molecules as well, including opioid-like molecules thought to cause a tanning “high.”
39367
Exposure to UV rays can cause premature aging of the skin and signs of sun damage such as wrinkles, leathery skin, liver spots, actinic keratosis, and solar elastosis. UV rays can also cause eye problems. They can cause the cornea (on the front of the eye) to become inflamed or burned.
1099861
Two types of UV rays reach the earth, UVA and UVB (the sun also emits UVC rays, but these are absorbed by the earth's atmosphere). UVA rays are the rays that cause tanning as well as wrinkles and other signs of premature aging, and UVB rays cause sunburns and skin cancer. But both ultimately damage your skin.
360957
In the process of controlling microorganisms, UV light damages their DNA, where organisms grow by cell division and genetic information is transmitted from a generation of cells to the next by the splitting of the DNA. ... If UV light hits a DNA, it is absorbed by the purine and pyrimidine molecules in the chain.
461717
Ultraviolet (UV) Light is a proven technology that has been killing mold, fungus, bacteria, and viruses since the beginning of time. ... Ultraviolet light can kill mold in air and on surfaces. It's effective at treating the mold you know about, and can help kill mold, including airborne spores that you can't see.
842875
The atmosphere does little to shield these rays—most UVA radiation reaches Earth's surface. UVA rays cause skin aging and eye damage, and can lower your body's ability to fight off illness. UVA rays also contribute to the risk of skin cancer.
56135
UV light is very effective at killing mold. Because this light directly penetrates the mold cells and damages the nucleic acids, the mold cells eventually die off after a period of an hour or two.
124372
Ultraviolet damage. Ultraviolet (UV) irradiation can cause several types of damage to RNA: photochemical modification, crosslinking, and oxidative damage. Much of the work describing UV damage to RNA has been carried out in vitro, with a few studies suggesting damage may also occur in vivo under physiologic conditions.