Persistence-Length Renormalization of Polymers in a Crowded Environment   of Hard Disks
  The most conspicuous property of a semiflexible polymer is its persistence length, defined as the decay length of tangent correlations along its contour. Using an efficient stochastic growth algorithm to sample polymers embedded in a quenched two-dimensional hard-disk fluid, we find apparent wormlike chain statistics with a renormalized persistence length. We identify a universal form of the disorder renormalization that suggests itself as a quantitative measure of molecular crowding. 
Sebastian Sch\"obl, Sebastian Sturm, Wolfhard Janke, Klaus Kroy
cond-mat.soft