Zewail, et.al., on DNA Folding and melting ...

Hairong Ma, Chaozhi Wan, Aiguo Wu and Ahmed H. Zewail. (2007) DNA folding and melting observed in real time redefine the energy landscape. Proceedings of the National Academy of Sciences of the United States of America, 104(3):712-716, 16 January 2007. CaltechAUTHORS.

Freely available online through the PNAS open access option.