(P11): Motors on the molecular scale
M. Porto, M. Urbakh, and J. Klafter, J. Luminescence 94-95, 137-142 (2001).
(International Conference `Dynamical Processes in Excited States of Solids´, Lyon, France, July 1 to 4, 2001)
You would like to see the engines at work? Have a look at the engine's page!
You might also be interested to read the Physics News Update No. 490, Story No. 1: `Atomic Scale Locomotives´ or Nature Science Update of July 3, 2000: `Fast forward`.