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Picture of the Day

Microbes in underground aquifers beneath deep-sea Mid-Atlantic Ridge 'chow down' on carbon

All life on Earth -- from blue whales to microbes -- uses carbon in one form or another. But all carbon is not created equal. In the oceans, some carbon-containing compounds, such as sugars and proteins, are quickly gobbled up by microorganisms, while others -- such as the chitin found in fish scales -- are much harder to consume. Scientists have long believed that relatively little of the latter, called "refractory carbon," is degraded in the ocean. Much of it falls to the ocean floor and helps make up deep-water sediment, or so the thinking has been. Now, a research team led by ecologists Sunita Shah Walter of the University of Delaware and Peter Girguis of Harvard University has shown that underground aquifers near the undersea Mid-Atlantic Ridge act like natural biological reactors, pulling in cold, oxygenated seawater, and allowing microbes to consume more -- perhaps much more -- refractory carbon than scientists believed.

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