We used ultraviolet radiation to do that.

And the image on the right is an ultraviolet image.

look at what's happening to the ultraviolet radiation.

live in low UV areas.

This is three minutes of UV light.

All the wavelengths in the Lyman series are in the ultraviolet band.

So we used ultraviolet A, which doesn't make vitamin D.

And the good thing about perceiving ultraviolet is that you can hear if it's a good day or a bad day to sunbathe, because ultraviolet is a dangerous color, a color that can actually kill us, so I think we should all have this wish to perceive things that we cannot perceive.

Now, if we take the integral of both sides of this equation, we get uv is equal to the antiderivative of u prime v plus the antiderivative of uv prime.

I'm just rewriting this. e to the minus st s.

looking at the equator, we were bombarded by high levels of ultraviolet radiation.

lots and lots of ultraviolet radiation and the melanin this wonderful, complex, ancient polymer compound in our skin served as a superb natural sunscreen.

So unlike the CAT scans, X rays, thalliums, for women whose breast is in the way of looking at the heart, every time we order something that has even a small amount of radiation, we say, Do we really need that test?

Some of us with darkly pigmented skin live in low UV areas.

Metal ion lasers are gas lasers that generate deep ultraviolet wavelengths.

They were studied with optical imaging, and through observations of occultations in ultraviolet and visible light.

It goes into the upper atmosphere, it actually reacts with the UV light to turn into ozone which then can help actually block the UV ligt.

So this seems to be a feature of ultraviolet rays hitting the skin.

Where it protected the body against the degradations of ultraviolet radiation, the destruction, or damage to DNA, and the breakdown of a very important molecule called folate, which helps to fuel cell production, and reproduction in the body.

Conditions were significantly colder, but they were also less intense with respect to the ultraviolet regime.

Look at some of the major latitudinal transgressions people from high UV areas going to low UV and vice versa.

The incrementally cooler colors blues, greens, yellows, and finally grays indicate areas of much lower ultraviolet radiation.

What's very, very important here is that the earliest humans evolved in high UV environments, in equatorial Africa.

National reports on existing and planned activities relating to ozone research and the monitoring, calibration and archiving of measurements and UV B monitoring and initiatives aimed at the prevention of UV B and sun related injuries.

In those early days of our evolution, looking at the equator, we were bombarded by high levels of ultraviolet radiation.

The depletion of the ozone layer lets more ultraviolet light from the sun down to the surface of the earth.

So it is constantly being bombarded with ultraviolet radiation from the sun which is very inhospitable to DNA and to life.

But the active irradiation, during the UV and for an hour after it, there is dilation of the blood vessels.

Between 1520 and 1867, 12 million, 500 people were moved from high UV to low UV areas in the transatlantic slave trade.

So if we're somewhere in the Northern Hemisphere, look at what's happening to the ultraviolet radiation.

Ultraviolet light may also be used to search body surfaces for any evidence not easily visible to the naked eye.

(The ozone is produced when UVC hits oxygen (O2) molecules, and so is only produced when oxygen is present.

Ozone distribution is derived from the change in the ratio of the same UV pair frequencies with time as the sun sets.

And when we shone UV at them, or when we warmed them up to the same level as the lamps, but didn't actually let the rays hit the skin, this didn't happen.

This ozone vulnerability is coupled to continuing risks associated with the effects of increased UV radiation on human health and ecosystems.

Without such a capability, the necessary high quality UV data record cannot be obtained.

It's times minus 1 s, e to the minus st. e to the minus st, that's the uv term right there.

We have an ozone layer up in the upper atmosphere that helps absorb, that blocks most of the UV radiation from the sun.

Due to weathering, due to U.V. light, due to oxidation, this binder, this bitumen, the glue between the aggregates is going to shrink, and if it shrinks, it gets micro cracks, and it delaminates from the aggregates.

Between 1520 and 1867, 12 million, 500 people were moved from high UV to low UV areas in the transatlantic slave trade.

See, special pigments absorb the UV light and they paint this big bullseye in the center of the flower guiding the bee to the tasty nectar, and of course, that sweet, sweet pollination.

Now the really hot pink and red areas are those parts of the world that receive the highest amounts of UV during the year.

Ultraviolet, and Ultrafiltration systems.

What's very, very important here is that the earliest humans evolved in high UV environments, in equatorial Africa.

The interaction of this plasma with the electrodes generates ultraviolet photons, which then excite the phosphor coating on the front of the display.