Water hydrating biomolecules shows a more complex dynamical behavior when compared to the bulk. Its translational slow dynamics can be described by two mechanisms characterized by two well distinct time scales. One mechanism is the α -relaxation typical of supercooled bulk water and other glass forming liquids. Upon cooling, this relaxation shows a fragile-to-strong crossover due to the activation of hopping phenomena which permits to the water molecules in the hydration layer to escape from nearest neighbors cage. The second mechanism is a much slower relaxation that is present only in hydration water and it is coupled with the biomolecule dynamics. This long-relaxation shows upon cooling a strong-to-strong crossover in coincidence with the well-known Protein Dynamical Transition. Structural rearrangements of biomolecules can trap hydration water molecules over length-scale larger than nearest neighbors distances. This causes a new hopping regime specific only of hydration water and already active at high temperature.
Camisasca, G., Iorio, A., Tenuzzo, L., & Gallo, P. (2022). Slow Dynamics of Biological Water. In Springer Proceedings in Physics (pp.29-52). Springer Science and Business Media Deutschland GmbH [10.1007/978-3-030-80924-9_2].
Titolo: | Slow Dynamics of Biological Water | |
Autori: | GALLO, PAOLA (Corresponding) | |
Data di pubblicazione: | 2022 | |
Serie: | ||
Citazione: | Camisasca, G., Iorio, A., Tenuzzo, L., & Gallo, P. (2022). Slow Dynamics of Biological Water. In Springer Proceedings in Physics (pp.29-52). Springer Science and Business Media Deutschland GmbH [10.1007/978-3-030-80924-9_2]. | |
Handle: | http://hdl.handle.net/11590/398386 | |
ISBN: | 978-3-030-80923-2 | |
Appare nelle tipologie: | 4.1 Contributo in Atti di convegno |