Lawrence University View Institution's Website 1 article published in JoVE Bioengineering Flexural Rigidity Measurements of Biopolymers Using Gliding Assays Douglas S. Martin1, Lu Yu1, Brian L. Van Hoozen1 1Department of Physics, Lawrence University A method to measure the persistence length or flexural rigidity of biopolymers is described. The method uses a kinesin-driven microtubule gliding assay to experimentally determine the persistence length of individual microtubules and is adaptable to actin-based gliding assays.