A demon of a device

@article{Sanderson2007ADO,
  title={A demon of a device},
  author={Katharine Sanderson},
  journal={Nature},
  year={2007}
}
Light makes molecular machines perform trick. 

References

A molecular information ratchet
TLDR
It is shown that information about the location of a macrocycle in a rotaxane—a molecular ring threaded onto a molecular axle—can be used, on the input of light energy, to alter the kinetics of the shuttling of the macrocycle between two compartments on the axle.