In Vitro essays

In Vitro essays When youre standing at the grocery store waiting in line and there is nothing better to do than stare at the magazines on the stand, theres a good chance that you might have wondered where stars like Jennifer Lopez, Britney Spears or Paris Hilton get that beautiful skin tone. If you happen to be a teenage girl, there is a good chance you know where it came from. You guess they either are so rich they can afford to go to Cancun every time they start turning pale or they took a quick trip to the local tanning bed center. The latter is the most correct because tanning beds are becoming very popular not only in the United States but around the world. The concept of tanning beds came to North America from Europe and more specifically from Germany. The rays from a tanning bed are long wave rays, which are known as ultraviolet A. The short waves from the sun are known as ultraviolet B (Corruth). The first units to become popular were the UVB booths and they were very low in UVB, often in the 1 percent or less range. While research had been done on the effects of light before the invention of tanning beds, it was not until 1975 that the first tanning beds appeared in Europe. Friedrich Wolff is known for having introduced the first tanning units at this time, and was soon joined by others (Tanning History). Four years later in 1979 the Germans introduced the first tanning beds in the United States. Since then, the United States market has developed new lamps. The majority of lamps used in the U.S. today are now in the 5.0 to 9.5 % UVB range (Tanning History). Once tanning beds became popular in 1980 the craze has only in creased. By late 1980's the medical officials were trying to warn people of the dangers to their skin. After that, tanning lost some of its popularity until 1990. Since then, tanning bed bulbs have become brighter with faster re ...