Nov 2, 2012
Beginnings of Bionic
Michael McAlpine’s shiny circuit doesn’t look like something you would stick in your mouth. It’s dashed with gold, has a coiled antenna and is glued to a stiff rectangle. But the antenna flexes, and the rectangle is actually silk, its stiffness melting away under water. And if you paste the device on your tooth, it could keep you healthy.
The electronic gizmo is designed to detect dangerous bacteria and send out warning signals, alerting its bearer to microbes slipping past the lips. Recently, McAlpine, of Princeton University, and his colleagues spotted a single E. coli bacterium skittering across the surface of the gadget’s sensor. The sensor also picked out ulcer-causing H. pylori amid the molecular medley of human saliva, the team reported earlier this year in Nature Communications.