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SSS 2011-02-14

时间:2011-03-04 03:51来源:互联网 提供网友:yw7514   字体: [ ]
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Imagine Van Gogh's paintings of yellow sunflowers. Now imagine the flowers brown. Eh, not so good. Sadly, we may someday see what that would look like. Because the bright yellow paints on the canvas are slowly turning muddy. Now, an international team of scientists has pinpointed1 the chemical reaction that drives this degradation—the first step toward stopping it. Their findings appear in the journal Analytical2 Chemistry.

Van Gogh's use of strong bright colors to convey mood and emotion marks a major milestone3 in art history. And his Sunflower series wouldn't be the same without the vibrant4 "chrome yellow" pigment5 that was new at the time. But this color darkens when exposed to the sun.

To find out why, researchers used x-ray analyses to determine the exact chemical composition of the paint as it browns. First, they exposed three tubes of chrome yellow to UV radiation until one turned a chocolate color. Analyzing6 that sample, they identified specific changes in the paint's chromium compounds. They then found the same chemical signature in the darkened areas of two van Gogh paintings. Until a chemical antidote7 is found, the researchers have some ironic8 advice: keep sunlight away from van Gogh's sunflowers.

"Flaming flowers that brightly blaze. Swirling9 clouds in violet haze10."

Thanks for the minute. For Scientific American's 60-Second Science, I'm Karen Hopkin.

"Reflect in Vincent's eyes of china blue. Colors changing hue11..."


点击收听单词发音收听单词发音  

1 pinpointed e23273e2459d3a2f113ef7cdb8d1c728     
准确地找出或描述( pinpoint的过去式和过去分词 ); 为…准确定位
参考例句:
  • His refusal to help simply pinpointed his cowardice. 他拒绝帮助正显示他的胆小。
  • Computers pinpointed where the shells were coming from. 计算机确定了炮弹发射的位置。
2 analytical lLMyS     
adj.分析的;用分析法的
参考例句:
  • I have an analytical approach to every survey.对每项调查我都采用分析方法。
  • As a result,analytical data obtained by analysts were often in disagreement.结果各个分析家所得的分析数据常常不一致。
3 milestone c78zM     
n.里程碑;划时代的事件
参考例句:
  • The film proved to be a milestone in the history of cinema.事实证明这部影片是电影史上的一个里程碑。
  • I think this is a very important milestone in the relations between our two countries.我认为这是我们两国关系中一个十分重要的里程碑。
4 vibrant CL5zc     
adj.震颤的,响亮的,充满活力的,精力充沛的,(色彩)鲜明的
参考例句:
  • He always uses vibrant colours in his paintings. 他在画中总是使用鲜明的色彩。
  • She gave a vibrant performance in the leading role in the school play.她在学校表演中生气盎然地扮演了主角。
5 pigment gi0yg     
n.天然色素,干粉颜料
参考例句:
  • The Romans used natural pigments on their fabrics and walls.古罗马人在织物和墙壁上使用天然颜料。
  • Who thought he might know what the skin pigment phenomenon meant.他自认为可能知道皮肤色素出现这种现象到底是怎么回事。
6 analyzing be408cc8d92ec310bb6260bc127c162b     
v.分析;分析( analyze的现在分词 );分解;解释;对…进行心理分析n.分析
参考例句:
  • Analyzing the date of some socialist countries presents even greater problem s. 分析某些社会主义国家的统计数据,暴露出的问题甚至更大。 来自辞典例句
  • He undoubtedly was not far off the mark in analyzing its predictions. 当然,他对其预测所作的分析倒也八九不离十。 来自辞典例句
7 antidote 4MZyg     
n.解毒药,解毒剂
参考例句:
  • There is no known antidote for this poison.这种毒药没有解药。
  • Chinese physicians used it as an antidote for snake poison.中医师用它来解蛇毒。
8 ironic 1atzm     
adj.讽刺的,有讽刺意味的,出乎意料的
参考例句:
  • That is a summary and ironic end.那是一个具有概括性和讽刺意味的结局。
  • People used to call me Mr Popularity at high school,but they were being ironic.人们中学时常把我称作“万人迷先生”,但他们是在挖苦我。
9 swirling Ngazzr     
v.旋转,打旋( swirl的现在分词 )
参考例句:
  • Snowflakes were swirling in the air. 天空飘洒着雪花。 来自《现代汉英综合大词典》
  • She smiled, swirling the wine in her glass. 她微笑着,旋动着杯子里的葡萄酒。 来自辞典例句
10 haze O5wyb     
n.霾,烟雾;懵懂,迷糊;vi.(over)变模糊
参考例句:
  • I couldn't see her through the haze of smoke.在烟雾弥漫中,我看不见她。
  • He often lives in a haze of whisky.他常常是在威士忌的懵懂醉意中度过的。
11 hue qdszS     
n.色度;色调;样子
参考例句:
  • The diamond shone with every hue under the sun.金刚石在阳光下放出五颜六色的光芒。
  • The same hue will look different in different light.同一颜色在不同的光线下看起来会有所不同。
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