title: Collective density fluctuations of DNA hydration water in the time-window below 1 ps.
abstract: 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.
authors.affiliation: Dipartimento di Fisica, Università degli Studi di Perugia, Via Pascoli, I-06123 Perugia, Italy. elena.cornicchi@fisica.unipg.it
authors.forename: Elena
authors.initials: E
authors.lastname: Cornicchi
authors.forename: Federico
authors.initials: F
authors.lastname: Sebastiani
authors.forename: Alessio
authors.initials: A
authors.lastname: De Francesco
authors.forename: Andrea
authors.initials: A
authors.lastname: Orecchini
authors.forename: Alessandro
authors.initials: A
authors.lastname: Paciaroni
authors.forename: Caterina
authors.initials: C
authors.lastname: Petrillo
authors.forename: Francesco
authors.initials: F
authors.lastname: Sacchetti
mesh_terms: D000818:Animals; D004247:DNA / Q000737:chemistry*; D033363:Neutron Diffraction; D012474:Salmon; D014867:Water / Q000737:chemistry*
chemical_list: D014867:Water; D004247:DNA