Sentences with phrase «by ultraviolet»

Nitrous oxide is removed from the atmosphere when it is absorbed by certain types of bacteria or destroyed by ultraviolet radiation or chemical reactions.

Hydrogen sulfide also damages ozone layer, and fossil spores from the end - Permian era shown deformities that could have been caused by ultraviolet radiation.

The black - light paintings reveal their true nature — and actually emit light — only when «excited» by ultraviolet bulbs.

Teeming with patterns and hand - lettering, the canvases approached «the chaotic palimpsests of street art, an unstable amalgam further compounded by the ultraviolet light's aura of indeterminacy.»

Methoprene is broken down by ultraviolet exposure.

It will protect your vehicle from damage caused by ultraviolet light, bird droppings and other environmental stress.

She suffers from a rare genetic disorder called xeroderma pigmentosum (XP), which means her body is unable to repair the damage caused by ultraviolet light.

Because it uses extremely hard, corrosion - resistant, anti-scratch special ceramics made, even if it will not fade by ultraviolet radiation.

Sunflower oil is extremely high in Vitamin E essential for preventing damage to the skin cells by the ultraviolet light or UVA from the sun

Avocado oil confers most of the benefits of avocados, including antioxidants, supports cardiovascular health and eyesight, reduces the skin damage and inflammation caused by ultraviolet light as well, making it the perfect ingredient for summer weather.

She adds; «Studies have suggested that by protecting the skin against damage that can be brought on by ultraviolet rays while keeping the skin nourished and not drying out, Vitamin E may help combat the signs of aging.

Lycopene, the phytochemical that makes tomatoes red, helps eliminate skin - aging free radicals caused by ultraviolet rays.

Another common fear is that aloe vera increases the skin's sensitivity to sunlight, and hence acne from sunlight due to the free radicals caused by ultraviolet light.

Beta - carotene, which is a carotenoid in carrots, might also protect against skin damage caused by ultraviolet rays.

They are caused by ultraviolet radiation from the sun.

Researchers at the Friedrich Miescher Institute for Biomedical Research in Switzerland in collaboration with researchers in NIBR, the University of Basel, and Professor SUGASAWA Kaoru, a member of the Biosignal Research Center at Kobe University, have contributed to revealing the molecular mechanism by which DNA damaged by ultraviolet rays is efficiently repaired.

Planetary nebulas are a late stage in a sun - like star's life, when its outer layers have sloughed off and are lit up by ultraviolet light from the central star.

These dense winds can be rendered visible by ultraviolet light from the hot central star or from highly supersonic collisions with the ambient gas that excites the material into florescence.

Electronic excitations caused by ultraviolet radiation also produce changes in the colour and transparency of photosensitive and photochromic glasses.

«Without a way to take it out of the atmosphere quicker, our measurements indicate there can not be much methane being put into the atmosphere by any mechanism, whether biology, geology, or by ultraviolet degradation of organics delivered by the fall of meteorites or interplanetary dust particles.»

When hydrogen gas is heated by the ultraviolet emissions of new stars, it produces a spectral signature called the Lyman - alpha line.

Or are they ripped apart by ultraviolet radiation?

«Because they are undergoing a firestorm of star birth, their light is dominated by the ultraviolet glow of fledgling stars.»

The chemical nucleation reaction is kick started by ultraviolet light.

This suggests that the accretion disk and gas stream are strong enough to survive despite the damage caused by ultraviolet light,» explained Andrés Guzmán, the study's principal researcher and a postdoctoral fellow at the University of Chile.

He transplanted the nucleus from a specialized cell of one frog (B) into an unfertilized egg of another frog (A) in which the nucleus had been destroyed by ultraviolet light.

These are the glowing remains of the stellar envelope of gas ejected during the AGB phase, which is ionised by ultraviolet radiation emitted by the central star.

Melanoma is associated with DNA damage and genomic alterations caused by ultraviolet light.

Lower in the atmosphere, oxygen atoms and hydroxyl radicals (OH), which form when water molecules are broken apart by ultraviolet photons, oxidize methane.

That remarkable radiance — caused by any ultraviolet light, including UV rays from the sun — has given rubies a special place in history.

The Little Ghost (right) is a more classic planetary nebula: Its doughnut is the steadily expanding ring of star gas that has been ionized and set aglow by ultraviolet light from the central white dwarf.

In 2003, however, researchers at the University of Groningen in the Netherlands who mounted single molecules of diarylethene between gold electrodes found that, even though the switches could be turned off by visible light, they could not then be turned back on by ultraviolet.

Here, the bright orange lanes have been whittled away by ultraviolet radiation from the star, turning them into knots with cometlike tails.

Earth's magnetic field also traps gas escaping from the upper atmosphere after it gets ionised by ultraviolet light from the sun.

I think it would be lost much more rapidly by ultraviolet degradation or through erosion by the solar wind.

One such sign is two new active regions captured this week by the ultraviolet camera on one of NASA's twin STEREO probes (see image).

On Mars, ozone is just as easily destroyed by the byproducts of water vapor breakdown by ultraviolet sunlight.

But there is evidence, says Fawell, «that arsenic may be a promoter of skin cancers caused by ultraviolet radiation».

When skin cells are damaged by ultraviolet light they produce more pigment, which makes skin appear darker.

On Earth, oxygen, ozone and methane eliminate each other rapidly and other gases are destroyed by ultraviolet radiation from the sun.

«More nitrogen has to come from somewhere to resupply both the nitrogen ice that is moving around Pluto's surface in seasonal cycles, and the nitrogen that is escaping off the top of the atmosphere as the result of heating by ultraviolet light from the Sun,» said Singer.

Sunburn in living organisms is caused by ultraviolet (UV) light from the sun damaging the DNA in the cells.

His beard is full and his skin darkened by the ultraviolet rays that glaciologists come to expect from working on a reflective ice sheet in 24 - hour sunlight.

The effect of the GS - DProSw molecule can be «switched off» by ultraviolet light prior to therapy.

The idea was that during the day, oxygen molecules are ionised by ultraviolet light from the Sun to form O2 + ions.

The images at right of Earth's aurora borealis — the shimmering lights created by particles of solar wind crashing into the polar atmosphere — were taken on April 9 by the UltraViolet Imager, an instrument on board nasa's polar satellite.

Waves of vibrating electrons, freed by ultraviolet light from the sun, seem to be why radar beams bounce off the upper atmosphere

Before the development of photosynthesis, which creates oxygen, Earth's surface was bombarded by ultraviolet radiation and was relatively inhospitable to life.

BARREN TREES Modern dwarf pines (shown) become unable to reproduce when irradiated by ultraviolet - B lamps.

We know that they are under stress when they are fighting cancer or other diseases, so I wondered whether anything measureable could be seen if we put them under further stress with UVA light.We found that people with cancer have DNA which is more easily damaged by ultraviolet light than other people, so the test shows the sensitivity to damage of all the DNA — the genome — in a cell.»