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TOP: schematic drawing showing the DNA molecule, with beads attached at both ends, in the laser beams of an "optical tweezer." MIDDLE: a microscopic picture of the DNA molecule. BOTTOM: a mechanical model depicting the interactions of molecule, beads, and laser beams in terms of springs; k is a spring constant and zeta is a coefficient of friction.
Reported by: GMeiners and Quake in Physical Review Letters, 22 May 2000