That's according to Daniel Sigman of Princeton, winner of a 2009 MacArthur "genius grant".

2009年麦克·阿瑟基金会天才奖得主、来自普林斯顿大学的丹尼尔·西格曼如是说。

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Daniel Sigman: Algae require nitrogen to grow, and their bodies, in turn, fuel the rest of the ocean food web.

丹尼尔·西格曼：海藻生长过程中需要氮，而海藻本身为海洋食物链中的其他生物提供养分。

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Sigman has been trying to piece together how efficiently tiny ocean plants - algae - were using nitrogen about 20,000 years ago.

西格曼博士致力于研究两万年前微型海洋植物海藻是如何高效利用氮元素的。

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Dr Sigman, whos reported was commissioned by Clearasil, said it was important for parents to be aware that puberty might arrive early for their daughters, and to try to talk to them in advance about the changes they would experience.

BBC: NEWS | Health | Stress 'fuelling early puberty'

Sigman 's Cingular, the biggest U.S. wireless firm, was first in the U.S. to sell popular phones such as Motorola's Razr, it's lagging rivals such as Verizon Communications and Sprint Nextel in its plans to build its high-speed network.

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