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SSS 2011-01-25

时间:2011-02-11 06:47来源:互联网 提供网友:qi2261   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 Cynthia Graber. This will just take a minute.

The Chesapeake Bay could get helped by a new antipollution expert: farmed oysters2. For decades, the Chesapeake has been plagued by excess nutrients3, such as nitrogen, from agricultural and municipal run-off. The nutrients feed algal blooms, which suck up the oxygen in the water. And those oxygen-poor waters no longer support the Bay’s rich biodiversity.

The Chesapeake used to be home to wild oysters, but 99 percent of them are gone. The tasty bivalves are known for removing excess phytoplankton from water and sequestering4 nutrients in their shells and flesh. So scientists from Virginia Commonwealth5 University measured the nutrient-chomping potential of the Eastern oyster1 Crassostrea virginica.

They tested dried tissue and shells from oysters in two aqua-culture sites, (which) turns out that if a farmed oyster grows to 76 millimeters, it’s a pretty effective water filter. Eight large-scale oyster farms could clean a ton of nitrogen from the Chesapeake. The study was published in the Journal of Environmental Quality.

Such farming won’t make the bay pristine6 again, but the researchers say the oysters are effective at cleaning the area where they’re grown. And so for a biologically better Chesapeake, pass the hot sauce.

Thanks for the minute. For Scientific American’s 60-Second Science, I’m Cynthia Graber.


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1 oyster w44z6     
n.牡蛎;沉默寡言的人
参考例句:
  • I enjoy eating oyster; it's really delicious.我喜欢吃牡蛎,它味道真美。
  • I find I fairly like eating when he finally persuades me to taste the oyster.当他最后说服我尝尝牡蛎时,我发现我相当喜欢吃。
2 oysters 713202a391facaf27aab568d95bdc68f     
牡蛎( oyster的名词复数 )
参考例句:
  • We don't have oysters tonight, but the crayfish are very good. 我们今晚没有牡蛎供应。但小龙虾是非常好。
  • She carried a piping hot grill of oysters and bacon. 她端出一盘滚烫的烤牡蛎和咸肉。
3 nutrients 6a1e1ed248a3ac49744c39cc962fb607     
n.(食品或化学品)营养物,营养品( nutrient的名词复数 )
参考例句:
  • a lack of essential nutrients 基本营养的缺乏
  • Nutrients are absorbed into the bloodstream. 营养素被吸收进血液。 来自《简明英汉词典》
4 sequestering 291d581ff3779bbedbe412d580940f13     
v.使隔绝,使隔离( sequester的现在分词 );扣押
参考例句:
  • Once installed the wood at further reducing carbon through the sequestering process. 本木料一旦植入,将通过一系列物理化学过程进一步有效降低碳量。 来自互联网
  • Sequestration and dispersion force of different kinds of sequestering a-gent are tested. 本文分别测定了几种不同类型络合剂的络合能力和分散能力。 来自互联网
5 commonwealth XXzyp     
n.共和国,联邦,共同体
参考例句:
  • He is the chairman of the commonwealth of artists.他是艺术家协会的主席。
  • Most of the members of the Commonwealth are nonwhite.英联邦的许多成员国不是白人国家。
6 pristine 5BQyC     
adj.原来的,古时的,原始的,纯净的,无垢的
参考例句:
  • He wiped his fingers on his pristine handkerchief.他用他那块洁净的手帕擦手指。
  • He wasn't about to blemish that pristine record.他本不想去玷污那清白的过去。
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