Comment on

• Unidirectional rotary motion in a molecular system.

  Kelly TR, De Silva H, Silva RA. Kelly TR, et al. Nature. 1999 Sep 9;401(6749):150-2. doi: 10.1038/43639. Nature. 1999. PMID: 10490021
• Light-driven monodirectional molecular rotor.

  Koumura N, Zijlstra RW, van Delden RA, Harada N, Feringa BL. Koumura N, et al. Nature. 1999 Sep 9;401(6749):152-5. doi: 10.1038/43646. Nature. 1999. PMID: 10490022