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Cover image: Pictured is a microbial mat growing near White Creek in Yellowstone National Park. These microbial communities produce lipids with unusually large variations in their deuterium content. Zhang et al. show that such variations likely relate to the different metabolic pathways employed by the microbes and suggest that deuterium variations in ancient lipids could be used to identify pathways of energy metabolism active in the past. See the Feature Article by Xinning Zhang et al. on pages 12580–12586. Image by Alex Sessions.
August 4, 2009
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106 (31) 12563-12564,
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