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#1 » 19.06.18 08:12h
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WASHINGTON Nike PG 2 Shoes For Sale , Feb. 19 (Xinhua) -- Much of the damage that ultraviolet radiation (UV) does to skin occurs hours after sun exposure, and this delayed reaction appears to be due to the skin pigment melanin, a U.S. study said Thursday.

Melanin, which gives skin its color Nike Air Humara Shoes For Sale , is usually thought of as a protective pigment, blocking the UV radiation that damages DNA and contributes to skin cancer.

But there was also evidence from studies suggesting that melanin was associated with skin cell damage.

In the new study, Douglas Brash, professor of the Yale University Nike Air Foamposite One For Sale , and his colleagues first exposed mouse and human melanocytes, the cells that make the melanin, to radiation from a UV lamp.

The radiation caused a type of DNA damage known as a cyclobutane dimer (CPD), in which two DNA "letters" attach and bend the DNA Nike SB Shoes For Sale , preventing the information it contains from being read correctly.

The researchers were surprised to find that the melanocytes not only generated CPDs immediately but continued to do so more than three hours after UV exposure ended. Cells without melanin generated CPDs only during the UV exposure.

The results, published in the U.S. journal Science, showed that melanin had both carcinogenic and protective effects.

"If you look inside adult skin, melanin does protect against CPDs. It does act as a shield Nike Air More Money For Sale ," said Brash. "But it is doing both good and bad things."

The researchers next tested the extent of damage that occurred after sun exposure by preventing normal DNA repair in mouse samples. They found that half of the CPDs in melanocytes were " dark CPDs" -- CPDs created in the dark.

Further research showed that the UV light activated two enzymes that combined to "excite" an electron in melanin, and that the energy generated from this process, known as chemiexcitation, in turn Nike Zoom VaporFly For Sale , causes the same DNA damage that sunlight caused in daytime.

Chemiexcitation has previously been seen only in lower plants and animals.

While noting that news of the carcinogenic effect of melanin is disconcerting, the researchers also said that the slowness of chemiexcitation may allow time for new preventive tools, such as an "evening-after" sunscreen designed to block the energy transfer.

  KIGALI, April 11 (Xinhua) -- Rwanda is set to turn the country's largest and oldest maximum security prison-Kigali Central Prison, commonly known as 1930, to a historical museum.

  The prison that accommodates most of the high profile prisoners in the country will become a museum by June this year, according to the City of Kigali authorities.

  Speaking to reporters on Monday, Monique Mukaruriza, Kigali City Mayor, said that it's a government property and it will soon become a historical museum.

  "The inmates occupying the facility will be relocated to a newly constructed Butamwa prison in Nyarugenge district. It is going to be a touristic site for both local and foreign visitors to learn more about Rwanda through this museum," she added.

  Mukaruriza noted that it will be a general history museum, not prison history museum.

  According to Sheikh Musa Fazil Harelimana, minister of internal security, Butamwa prison also in Kigali City will soon accommodate inmates from 1930 prison.

  "Kigali City will decide on what the prison will turn into. If they want it to be a historical museum they are free to do it after the inmates have relocated to Butamwa," he noted.

  If turned into a museum, Kigali Central Prison will be the 9th museum in Rwanda.

  Rwanda continues to put tourism at the top because the country is endowed with remarkable attractions such as rare mountain gorillas, historical museums and beautiful canopy walk.

  The tourism industry is the country's largest foreign exchange earner.

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