Arsenic and old...photosynthesis?
A previously unknown form of photosynthesis discovered in purple bacteria scooped from a Californian hot spring may be an ancient process that arose before the evolution of oxygenic photosynthesis, according to a paper published on Friday (August 15) in linkurl:Science.;http://www.sciencemag.org/ The bacteria use arsenic instead of water for photosynthesis. "It's a fundamental, exciting observation," said linkurl:Tim McDermott,;http://tbi.montana.edu/facultystaff/mcdermott.html a professor of

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Megan Scudellari
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