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liushuai1122木虫 (著名写手)
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头发变白的原因
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Why Hair Goes Gray—— Study Blames a Chain Reaction That Makes Hair Bleach Itself From the Inside Out Feb. 25, 2009 -- Scientists may have figured out why hair turns gray, and their finding may open the door to new anti-graying strategies. New research shows that hair turns gray as a result of a chemical chain reaction that causes hair to bleach itself from the inside out. The process starts when there is a dip in levels of an enzyme called catalase. That catalase shortfall means that the hydrogen peroxide that naturally occurs in hair can't be broken down. So hydrogen peroxide builds up in the hair, and because other enzymes that would repair hydrogen peroxide's damage are also in short supply, the hair goes gray. Putting the brakes on that chemical chain reaction "could have great implications in the hair graying scenario in humans," write the researchers, who included Karin Schallreuter, a professor clinical and experimental dermatology at England's University of Bradford. The study appears online in The FASEB Journal; the FASEB is the Federation of American Societies for Experimental Biology. 头发为什么变白——研究归结为一链式反应使得头发从里向外变白 2009年2月25日——科学家们揭示了头发变白的原因，这一发现有望为防治头发变白提供新的思路。最新研究显示，头发变白是一化学链式反应的结果，正是这一反应导致头发自身从里向外变白。这一过程始于过氧化氢酶的水平下降。过氧化氢酶量不足意味着头发中的双氧水不能被有效分解掉。因此，双氧水便在头发中沉积，当其他一些负责修复双氧水破坏的酶也缺乏时，头发开始变白。 包括英国布拉德福德大学临床实验皮肤病学教授Karin Schallreuter在内的研究者指出，遏制这一化学反应对于防治头发变白很有意义。 这一研究发表在FASEB杂志的网络版上，FASEB是美国实验生物学学会联合会。 http://www.webmd.com/skin-problems-and-treatments/news/20090225/why-hair-goes-gray |
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