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Electric Bacteria? Here's How to Put Electron-Gobblers to Work

Electron-eating bacteria could shed light on the possibilities for extraterrestrial extremophiles, but they can have practical applications as well.
Image: Geobacter
Geobacter sulfurreducens is only one of the kinds of bacteria that "eat and breathe" electrons.Nature Nanotechnology

Biochemists have long known that electrons are part of the cycle of life, but some strains of bacteria take their electrons straight rather than shuffling them through the machinery of sugars and adenosine triphosphate, or ATP. New Scientist reports that researchers are finding more bacteria that "eat and breathe" pure electrons, and they're using electric current to coax those bacteria into forming networks of bio-nanowires.

Among the researchers cataloging the electro-bacteria menagerie is the University of Southern California's Ken Nealson, a former NASA astrobiologist who suspects such organisms could thrive in extraterrestrial environments. But he also wants to put the critters to work here on Earth, in "self-powered useful devices," or SPUDs. By manipulating the voltage, scientists can modulate the electron flow. They're already working on bio-transistors, microbial fuel cells and bacteria-powered systems to clean up toxic waste. This could be the start of the micro-industrial age.

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