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SSS 2008-02-29

时间:2010-05-13 03:00来源:互联网 提供网友:0922013129   字体: [ ]
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    (单词翻译:双击或拖选)

This is Scientific American's 60-Second Science. I'm Karen Hopkin, this'll just take a minute.

 

Next time you are shoveling snow off your walk, don't blame the weatherman, blame bacteria. Because an international team of scientists has found that microbes that float through the atmosphere can seed the formation of ice crystals in clouds, crystals that then precipitates1 snow. The discovery subscribed2 in the February 29 issue of Science. Some bacteria including bugs3 that infected plants have been known to catalyze4 the growth of ice here on earth. So the scientists got to wondering whether they might do the same in the sky. Making atmospheric  ice crystal is the first step in any recipe for precipitation whether the final dish is rain or sleet5 or snow. So the scientists collected fresh snow from various places around the world including the French Alps and Antarctica and Bozeman, Montana. They found that most of their samples contained cells and cell fragments and these biological materials were capable of nucleating the growth of ice. How the bugs got there in the first place is anybody's guess. The scientists figure microbes may drift thousands of miles before they get caught up in a cloud and scare up a storm. Just something to ponder next time you stick out your tongue to catch a pretty snowflake.

 

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


点击收听单词发音收听单词发音  

1 precipitates e830548bc11fe12d5fa66bfa716886b7     
v.(突如其来地)使发生( precipitate的第三人称单数 );促成;猛然摔下;使沉淀
参考例句:
  • Water precipitates camphor from its alcoholic solution. 水能把樟脑从其酒精溶液中淀析出来。 来自《简明英汉词典》
  • Precipitates are usually collected by centrifugation at intervals. 常常是用离心法分段收集沉淀的。 来自辞典例句
2 subscribed cb9825426eb2cb8cbaf6a72027f5508a     
v.捐助( subscribe的过去式和过去分词 );签署,题词;订阅;同意
参考例句:
  • It is not a theory that is commonly subscribed to. 一般人并不赞成这个理论。 来自《简明英汉词典》
  • I subscribed my name to the document. 我在文件上签了字。 来自《简明英汉词典》
3 bugs e3255bae220613022d67e26d2e4fa689     
adj.疯狂的,发疯的n.窃听器( bug的名词复数 );病菌;虫子;[计算机](制作软件程序所产生的意料不到的)错误
参考例句:
  • All programs have bugs and need endless refinement. 所有的程序都有漏洞,都需要不断改进。 来自《简明英汉词典》
  • The sacks of rice were swarming with bugs. 一袋袋的米里长满了虫子。 来自《简明英汉词典》
4 catalyze BTiyV     
v.催化
参考例句:
  • They are highly specific for the reactions that they catalyze.它们对被它们催化的反应有很强的专一性。
  • They are highly specific for the reactions that they catalyze.它们对被它们催化的反应有很强的专一性。
5 sleet wxlw6     
n.雨雪;v.下雨雪,下冰雹
参考例句:
  • There was a great deal of sleet last night.昨夜雨夹雪下得真大。
  • When winter comes,we get sleet and frost.冬天来到时我们这儿会有雨夹雪和霜冻。
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