Collective density fluctuations of DNA hydration water in the time-window below 1 ps

被引：22

作者：

Cornicchi, Elena ^{[1
,2
]}

Sebastiani, Federico ^{[1
]}

De Francesco, Alessio ^{[3
]}

Orecchini, Andrea ^{[1
,2
]}

Paciaroni, Alessandro ^{[1
,2
]}

Petrillo, Caterina ^{[1
,2
]}

Sacchetti, Francesco ^{[1
,2
]}

机构：

[1] Univ Perugia, Dipartimento Fis, I-06123 Perugia, Italy

[2] Univ Perugia, Dipartimento Fis, Unita Perugia, Ist Off Mat, I-06123 Perugia, Italy

[3] CNR, Inst Laue Langevin, Unita Grenoble, Ist Off Mat, F-38042 Grenoble, France

来源：

JOURNAL OF CHEMICAL PHYSICS | 2011年 / 135卷 / 02期

关键词：

biochemistry; DNA; molecular biophysics; solvation; water; ELASTIC NEUTRON-SCATTERING; X-RAY; PROTEIN HYDRATION; HYDROGEN-EXCHANGE; BASE COMPOSITION; DYNAMICS; TEMPERATURE; TRANSITION; CRYSTAL; SPECTROSCOPY;

D O I：

10.1063/1.3609101

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The coherent density fluctuations propagating through DNA hydration water were studied by neutron scattering spectroscopy. Two collective modes were found to be sustained by the aqueous solvent: a propagating excitation, characterised by a speed of about 3500 m/s, and another one placed at about 6 meV. These results globally agree with those previously found for the coherent excitations in bulk water, although in DNA hydration water the speed of propagating modes is definitely higher than that of the pure solvent. The short-wavelength collective excitations of DNA hydration water are reminiscent of those observed in protein hydration water and in the amorphous forms of ice. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3609101]

引用

页数：7