%0 Journal Article %J IEEE Transactions on Terahertz Science and Technology %D 2013 %T Photoactive yellow protein terahertz response: hydration, heating and intermediate states %A George, Deepu K %A Knab, Joseph R %A He, Yunfen %A Kumauchi, Masato %A Birge, Robert R %A Hoff, Wouter D %A Markelz, Andrea G %B IEEE Transactions on Terahertz Science and Technology %V 3 %P 288-294 %@ 2156-342X %G eng %R https://doi.org/10.1109/TTHZ.2013.2256233 %0 Journal Article %J Chemical Physics Letters %D 2007 %T Protein dynamical transition in terahertz dielectric response %A Markelz, Andrea G. %A Knab, Joseph R. %A Chen, Jing Yin %A He, Yunfen %X

The 200K protein dynamical transition is observed for the first time in the terahertz dielectric response. The complex dielectric permittivity ε=ε′+iε″ is determined in the 0.2–2.0THz and 80–294K ranges. ε″ has a linear temperature dependence up to 200K then sharply increases. The low temperature linear dependence in ε″ suggests anharmonicity for temperatures 80K<t<180k, challenging="" the="" assumed="" harmonicity="" below="" 200k.="" temperature="" dependence="" is="" consistent="" with="" thermally="" activated="" sidechain="" motions="" and="" shows="" involved="" in="" dynamical="" transition="" extend="" to="" subpicosecond="" time="" scales.<="" div="">

%B Chemical Physics Letters %V 442 %P 413 - 417 %@ 0009-2614 %G eng %U https://www.sciencedirect.com/science/article/pii/S000926140700680X %N 4 %! Chemical Physics Letters %R 10.1016/j.cplett.2007.05.080 %0 Conference Proceedings %B 2006 Joint 31st International Conference on Infrared Millimeter Waves and 14th International Conference on Teraherz Electronics %D 2006 %T Protein conformational dynamics measured with terahertz time domain spectroscopy %A Knab, Joseph R %A Chen, Jing-Yin %A Ye, Shuji %A He, Yunfen %A Markelz, Andrea G %B 2006 Joint 31st International Conference on Infrared Millimeter Waves and 14th International Conference on Teraherz Electronics %I IEEE %P 183-183 %@ 1424403995 %G eng %R https://doi.org/10.1088/0031-9155/47/21/318