How does UV induce mutations?
We know that the UV B chemically alter the bases, in particular by causing the association, by strong chemical bond, of two close thymines, which gives a “dimer of cyclobutane”. The genes carried by the DNA are thereby modified. This chemical reaction explains the strong mutagenic power of UV B.
Radiation ultraviolet (UV) comes from both natural sources (like the sun) and man-made sources (like black light, soldering devices, lasers, and tanning devices).
The layer ofozone makes life on Earth possible, because it absorbs the most dangerous part of the rays ultraviolet. It acts as a protective dome that absorbs the rays ultraviolet emitted by the Sun. Radiation ultraviolet is divided into three bands: UVA, UVB and UVC.
For to know how many minutes you can stay in the sun, just divide this number by the strength of the sun (UV index). Example: x You are type 3, so your number ofUV index is 200. x Today theUV index is 7. x You divide 200 by 7 = approximately 30.
Re: Radiation from a flame But the spectral distribution is, roughly the same. A blackbody at 8°C radiates practically nothing in UV. In any case much less than a classic bulb whose filament is much hotter than the oven.
This ozone stratospheric strongly absorbs some ultraviolet rays from the sun, thereby protecting the planet’s organisms from certain radiations that are harmful to health and life on Earth. Thanks to this beneficial role, theozone stratospheric is considered a “good” ozone.
What are UVs? The process consists of applying a flat image (2D texture) on the surface of a volume model (3D). The term UV derives from the two-dimensional (2D) nature of the process: U and V represent the two axes of the 2D plane of the applied texture (X, Y, and Z being already used for the 3D axes of the model).
In conclusion, we had to show that UV rays are harmful to our skin because they cause the death of yeasts. They act in the same way on our skin and cause mutations that cause skin cell death and even cancer.
While the UV source appears to be low intensity and dark purple in color, the fluorescent pattern becomes very bright and colorful. The yellow disappears, it is no longer fluorescent: these glasses were therefore effective. The majority of the radiation emitted by the uv lamp is logically in the ultraviolet, and that we cannot see.
We wanted to demonstrate that yeasts, which react in the same way as the skin, are very sensitive to UV.