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The test screw consists of a silicon nitride ceramic outer sleeve (including the flights) on a metal shank. These hybrid ball bearings combine traditional steel rings matched with silicon nitride (ceramic) balls to provide natural insulating properties and prevent electrical arcing. The new biosensor, developed by Harold Craighead of Cornell University and his colleagues, consists of an array of micro cantilevers made of silicon nitride, each one spotted on the end with gold. |
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