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# Femtomolar Optical Tweezers

Basic scheme of an optical tweezer-based sensor of biological particles.  A microsphere covered with a specific antigen (such as a virus or other infectious agent) is trapped and pulled away from a surface containing the corresponding antibodies.  The minimum amount of force applied to the tweezers to break the bonds can provide information on the concentration of antibodies on the surface.

*Physics

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November 12, 2008

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