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We probed the bending of actin subject to external forcing and viscous drag.Single actin filaments were moved perpendicular to their long axis in anoscillatory way by means of an optically tweezed latex bead attached to one endof the filaments. Shapes of these polymers were observed by epifluorescencemicroscopy. They were found to be in agreement with predictions of semiflexiblepolymer theory and slender-body hydrodynamics. A persistence length of $7.4 \pm0.2 \mu$m could be extracted.Comment: RevTex, 4 pages, 5 eps figs, submitted to PR

Elastohydrodynamic study of actin filaments using fluorescence microscopy