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Structural fluctuation of proteins revealed by terahertz time-domain spectroscopy
Author(s) -
Ohki Kambara,
Keisuke Tominaga
Publication year - 2010
Publication title -
spectroscopy an international journal
Language(s) - English
Resource type - Journals
eISSN - 1875-922X
pISSN - 0712-4813
DOI - 10.1155/2010/391586
Subject(s) - terahertz radiation , terahertz time domain spectroscopy , spectroscopy , terahertz spectroscopy and technology , refractive index , inelastic neutron scattering , lysozyme , spectral line , materials science , attenuation coefficient , inelastic scattering , absorption spectroscopy , molecular physics , absorption (acoustics) , analytical chemistry (journal) , scattering , chemistry , optics , physics , biochemistry , chromatography , quantum mechanics , astronomy
We have measured spectra of the absorption coefficient and refractive index of hen egg white lysozyme in the wavenumber region from 7 cm –1 to 50 cm –1 by terahertz (THz) time-domain spectroscopy. From comparison with the results of the inelastic neutron scattering experiment it is concluded that analysis of the THz spectra provides information on the vibrational density of states. We studied temperature dependence of the THz spectra as well as hydration effect on them to discuss structural fluctuation of the protein. We observed dynamical transition at around 210 K for lysozyme.

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