| Autor: |
Surovtsev, N. V., Malinovsky, V. K., Boldyreva, E. V. |
| Předmět: |
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| Zdroj: |
Journal of Chemical Physics; 1/28/2011, Vol. 134 Issue 4, p045102, 5p |
| Abstrakt: |
The temperature dependence of selected low-wavenumber (< 200 cm-1) Raman bands was studied for the different crystalline phases (α-, β-, γ-) of glycine - the simplest possible 'building block' of a biomolecule. The temperature dependence of the frequencies of vibrational modes deviates from the theoretical expectation based on the assumption of cubic anharmonicity. Although relatively small, this deviation was observed above 250 K for all the three polymorphs. This finding was discussed in relation to the 'dynamical transition' phenomenon, observed in variety of biomolecules in the range 200-250 K. The similarity of the temperatures suggests, that the origin of the dynamical transition phenomenon can be related to intrinsic conformational states of biomolecules, while water serves rather as a plasticizer or a structure organizer. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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