防晒霜或干扰皮肤防御紫外线
<p><span word="Suncream">Suncream</span> <span word="may">may</span> <span word="actually">actually</span> <span word="block">block</span> <span word="the">the</span> <span word="body">body</span>'<span word="s">s</span> <span word="natural">natural</span> <span word="defence">defence</span> <span word="against">against</span> <span word="harmful">harmful</span> <span word="UV">UV</span> <span word="rays">rays</span>, <span word="a">a</span> <span word="surprising">surprising</span> <span word="new">new</span> <span word="study">study</span> <span word="has">has</span> <span word="found">found</span>.</p><p><span word="Scientists">Scientists</span> <span word="from">from</span> <span word="Brown">Brown</span> <span word="University">University</span> <span word="have">have</span> <span word="discovered">discovered</span> <span word="that">that</span> <span word="human">human</span> <span word="skin">skin</span> <span word="contains">contains</span> <span word="sensors">sensors</span> <span word="that">that</span> <span word="detect">detect</span> <span word="radiation">radiation</span> <span word="from">from</span> <span word="the">the</span> <span word="sun">sun</span>.</p><p><span word="These">These</span> <span word="light">light</span> <span word="receptors">receptors</span> - <span word="which">which</span> <span word="are">are</span> <span word="also">also</span> <span word="found">found</span> <span word="in">in</span> <span word="the">the</span> <span word="retina">retina</span> <span word="of">of</span> <span word="the">the</span> <span word="eye">eye</span> - <span word="immediately">immediately</span> <span word="prompt">prompt</span> <span word="the">the</span> <span word="release">release</span> <span word="of">of</span> <span word="melanin">melanin</span>, <span word="the">the</span> <span word="body">body</span>'<span word="s">s</span> <span word="own">own</span> <span word="form">form</span> <span word="of">of</span> <span word="sun">sun</span> <span word="protection">protection</span>.</p><p><span word="This">This</span> <span word="is">is</span> <span word="likely">likely</span> <span word="to">to</span> <span word="provide">provide</span> <span word="rapid">rapid</span> <span word="protection">protection</span> <span word="against">against</span> <span word="UV">UV</span> <span word="damage">damage</span>, <span word="long">long</span> <span word="before">before</span> <span word="the">the</span> <span word="skin">skin</span> <span word="starts">starts</span> <span word="to">to</span> <span word="tan">tan</span>.</p><p><span word="Researchers">Researchers</span> <span word="now">now</span> <span word="believe">believe</span> <span word="that">that</span> <span word="full">full</span> <span word="sunscreen">sunscreen</span> <span word="blockage">blockage</span> <span word="is">is</span> <span word="not">not</span> <span word="necessarily">necessarily</span> <span word="good">good</span> <span word="in">in</span> <span word="sun">sun</span> <span word="creams">creams</span> <span word="because">because</span> <span word="they">they</span> <span word="block">block</span> <span word="certain">certain</span> <span word="wavelengths">wavelengths</span> <span word="of">of</span> <span word="light">light</span> <span word="needed">needed</span> <span word="to">to</span> <span word="trigger">trigger</span> <span word="the">the</span> <span word="body">body</span>'<span word="s">s</span> <span word="natural">natural</span> <span word="defences">defences</span>.</p><p><span word="Elena">Elena</span> <span word="Oancea">Oancea</span>, <span word="lead">lead</span> <span word="researcher">researcher</span> <span word="at">at</span> <span word="the">the</span> <span word="university">university</span> <span word="in">in</span> <span word="Providence">Providence</span>, <span word="Rhode">Rhode</span> <span word="Island">Island</span>, <span word="said">said</span>: “<span word="There">There</span> <span word="was">was</span> <span word="no">no</span> <span word="prior">prior</span> <span word="evidence">evidence</span> <span word="that">that</span> <span word="those">those</span> <span word="receptors">receptors</span> <span word="can">can</span> <span word="function">function</span> <span word="in">in</span> <span word="skin">skin</span>.”</p><p>“<span word="Our">Our</span> <span word="work">work</span> <span word="shows">shows</span> <span word="that">that</span> <span word="a">a</span> <span word="dedicated">dedicated</span> <span word="UV">UV</span> <span word="receptor">receptor</span> <span word="allows">allows</span> <span word="skin">skin</span> <span word="cells">cells</span> <span word="to">to</span> <span word="immediately">immediately</span> <span word="detect">detect</span> <span word="and">and</span> <span word="respond">respond</span> <span word="to">to</span> <span word="UV">UV</span> <span word="light">light</span>.”</p><p><span word="She">She</span> <span word="added">added</span>: “<span word="This">This</span> <span word="protective">protective</span> <span word="capacity">capacity</span> <span word="should">should</span> <span word="be">be</span> <span word="taken">taken</span> <span word="into">into</span> <span word="consideration">consideration</span> <span word="in">in</span> <span word="the">the</span> <span word="design">design</span> <span word="and">and</span> <span word="use">use</span> <span word="of">of</span> <span word="broad">broad</span>-<span word="spectrum">spectrum</span> <span word="sunscreens">sunscreens</span>.”</p><p>据英国《每日邮报》11月4日报道，一项令人惊奇的新研究发现防晒霜实际上可能会阻碍人体对紫外线的自我防御。</p><p>布朗大学的科学家们发现了在人的皮肤中包含一种感光物质。</p><p>在视网膜中也能发现这些感光物质。它们能迅速刺激皮肤黑色素的生成，保护人体不受太阳光线的伤害。</p>
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