| Autor: |
Ulderico Wanderlingh, H.D. Middendorf, Mark T. F. Telling, Carmelo Corsaro |
| Rok vydání: |
2008 |
| Předmět: |
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| Zdroj: |
Chemical Physics. 345:245-249 |
| ISSN: |
0301-0104 |
| DOI: |
10.1016/j.chemphys.2007.10.015 |
| Popis: |
We measured quasielastic neutron spectra (0.2 Q −1 ) with a resolution of 13 μeV (HWHM) for 56% H 2 O-hydrated powder samples of the tripeptide glutathione, using a new pulsed-source backscattering instrument with considerable potential for advancing work on biomolecular dynamics. Both window-integrated intensities and spectrally resolved dynamic structure factors were determined for temperature sequences going down from 300 to 50 K and then up again to 300 K at the same points. We discuss four features of the results obtained: (a) The slow increase of proton mobilities from 50 K towards 250 K; (b) the properties of a sharp dynamic transition near 260 K; (c) the onset of quasielastic broadenings around 270 K; (d) small T and Q dependent changes observable in up minus down difference spectra. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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