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BOSTON - "Eat your spinach," Mom used to say. "It will make your muscles grow, power your laptop and recharge your cell phone... " OK. So nobody's Mom said those last two things. But researchers at the Massachusetts Institute of Technology (news - web sites) say they have used spinach to harness a plant's ability to convert sunlight into energy for the first time, creating a device that may one day power laptops, mobile phones and more.

Photosynthesis, the process by which plants use light beams for energy rather than eating food like animals, has been known to scientists for decades.

But attempts to combine the organic with the electronic had always failed: Isolate the photosynthetic proteins that capture the energy from sunlight, and they die. Inject the water and salt needed to keep the proteins alive, and the electronic equipment is destroyed.

That was until Shuguang Zhang, associate director of MIT's Center for Biomedical Engineering, discovered that protein building blocks called detergent peptides could be manipulated to keep the proteins alive up to three weeks while in contact with electronics.

"Stabilizing the protein is crucial," said Zhang, who collaborated with researchers from MIT, the University of Tennessee and the U.S. Naval Research Laboratory, including electrical engineers, nanotechnology experts and biologists. "Detergent peptide turned out to be a wonderful material to keep proteins intact."




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