Reaction Kinetics in a Tight Spot
  The standard analysis of reaction networks based on deterministic rate equations fails in confined geometries, commonly encountered in fields such as astrochemistry, thin film growth and cell biology. In these systems the small reactant population implies anomalous behavior of reaction rates, which can be accounted for only by following the full distribution of reactant numbers. 
Ofer Biham, Joachim Krug, Azi Lipshtat and Thomas Michely