美国科学60秒 SSS 2012-11-30
时间：2013-06-20 08:38:13
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（单词翻译）
You might say blue-green algae1 are optimists2: they put things in the best possible light—literally. Actually, the organisms aren’t really algae. They’re photosynthetic3 ocean bacteria. And they can fine-tune their photosynthetic apparatus4 to take advantage of the predominant wavelength5 of light. Now researchers have figured out how one of the world’s most abundant phytoplankton control their color change.
It all comes down to a single, light-sensitive
enzyme6. In
coastal7 waters where the surrounding light and water are green, specific proteins help catch green light. But in the deeper blue-colored waters, the color change
activates8 an enzyme that replaces the green-light
catching9 proteins with ones
tuned10 for blue light. The finding is in the
Proceedings11 of the National Academy of Sciences.
The bacteria produce 20 percent of the planet’s oxygen and also consume carbon dioxide from the atmosphere. Researchers say understanding how the bacteria
optimize12 their
photosynthesis13 may help inform climate change scientists. And medical researchers could also get ideas for
pigments14 useful in medical research. Who knew pond scum could be so smart?
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