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What are uv carcinogenic factors

时间:2016-04-19 09:12来源:sankun点击:

What are uv carcinogenic factors
 

  Ultraviolet ray direct illuminate skin, besides have antiseptic effect, still have to adjust and improve nerve, endocrine, digestion, circulation, respiration, blood, immune system, and promote the function of vitamin D production. However, in recent years, people gradually realized that excessive ultraviolet photochemical reaction, a series of changes can make the function of the body, especially to the human body skin, eyes and immune system damage. In recent years in the United States, Canada, Australia and other countries and some cities in our country, has begun releasing the uv index forecast, to remind the public to take the corresponding protective measures.

  A few days ago, the world health organization experts called for people to engage in outdoor activities to avoid long time exposure in the sun, to the beach and the mountains on vacation pay particular attention to protect the skin.

  The effects of ultraviolet radiation to the human body skin and eyes. The skin to absorb ultraviolet light to the wavelength. The shorter the wavelength, penetrate into the skin depth, the smaller, less melanin calm after irradiation; The longer the wavelength, penetrate into the skin depth, the greater the melanin and stronger after irradiation. Due to the effect of photochemical reaction, energy level high photon flow can cause degeneration of intracellular nucleoprotein and some enzymes. After ultraviolet radiation, therefore, should be after the incubation period of 6 to 8 hours to change in cells and onset of symptoms, including skin dry, pain, skin shrivel, sparkling even fall off. As ultraviolet penetration to the organization is very weak, under the skin less deep tissue injury. But can cause severe ultraviolet (uv), body fatigue, low thermal, sleepiness and systemic reactions. Some people's skin due to allergic to ultraviolet ray, after light solar dermatitis (also called a sunburn), exposed areas of skin itching, tingling, skin desquamation, possibly dyke break crusts. Actual observations show that at an altitude of 3500 meters of plateau (uv usually 3-4 times of the plains), bare skin around noon under uv light, for 20-40 minutes, skin burning sensation and peeling; 40-80 minutes, the skin will be pimples blisters and lead to a variety of pathological changes.

  Long-term, repeated exposure, can cause the skin and mucous membrane of solar sex keratinization disorder (light Angle disorder), performance in the exposed parts (such as forehead, cheeks, nose, lips, eyelids and conjunctival) in single and multiple flat Angle layer thickening. According to medical analysis, this is a kind of precancerous change. Studies have shown that uv light can cause deoxyribonucleic acid (DNA) in the nuclei of damage, because the body internal defects, the cell can not to damage the DNA repair, thus occurred to the variation of DNA replication, if the body's immune system is not rejection in time, to clear the mutation of cells, namely defective immune surveillance function, the variation of DNA cells to proliferate and eventually lead to the formation of tumor, therefore, ultraviolet ray is the skin of an important factor in cancer.


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