= Erik Schäffer
{c}
A researcher in <biophysics> who develops <optical tweezers> to measure how molecular machines, including <kinesin>, generate forces. Such experiments connect motion at the scale of individual molecules to the mechanical behavior of cells.<Professional profile of Erik Schäffer at the University of Tübingen>[Research: single-molecule fluorescence and force microscopy, kinesin motors and DNA repair]{ref}
He coauthored a calibration method combining <thermal motion> with a known oscillation of the sample stage, allowing the trap to measure forces without assuming the bead size or fluid <viscosity>.<Calibration of optical tweezers with positional detection in the back-focal-plane by Simon F. Tolić-Nørrelykke and others>[Abstract: thermal-spectrum and driven-stage calibration]{ref}
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