Anharmonic transitions in nearly dry L-cysteine I

Details Anharmonic transitions in nearly dry L-cysteine I Anharmonic transitions in nearly dry L-cysteine I

2011-03-03

arxiv.org/abs/1103.0706v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 4 figures, submitted to Physical Review Letters

Scientific paper

Two special dynamical transitions of universal character have been recently observed in macromolecules at $T_{D}\sim 180 - 220$ K and $T^{*}\sim 100$ K. Despite their relevance, a complete understanding of the nature of these transitions and their consequences for the bio-activity of the macromolecule is still lacking. Our results and analysis concerning the temperature dependence of structural, vibrational and thermodynamical properties of the orthorhombic polymorph of the amino acid L-cysteine (at a hydration level of 3.5%) indicated that the two referred temperatures define the triggering of very simple and specific events that govern all the biochemical interactions of the biomolecule: activation of rigid rotors ($TT_{D}$).

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