Document Detail


Glassy Character of DNA Hydration Water.
MedLine Citation:
PMID:  23294006     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The coherent excitations of DNA hydration water at 100K have been investigated by neutron scattering spectroscopy to extract the excess signal of D2O-hydrated DNA with respect to dry DNA samples. A structural characterization of the sample, through the analysis of the static structure factor, has suggested that DNA hydration water is largely in an amorphous state up to high hydration degree, with only a small contribution coming from slightly deformed crystalline ice. To describe the inelastic spectra of DNA hydration water we exploited a phenomenological model already applied in similar disordered systems, such as bulk water (1) and protein hydration water (2). Over the low-energy range, the coherent dynamics of DNA hydration water is characterized by a branch at about 7.5 meV, a value slightly larger than that of bulk water. An additional mode in the energy range 20 ÷ 35 meV is found, with a wavevector dependence seemingly connected with the structural features of amorphous ice. The ensemble of the results supports the glassy nature of DNA hydration water.
Authors:
Alessandro Paciaroni; Andrea Orecchini; Guido Goracci; Elena Cornicchi; Caterina Petrillo; Francesco Sacchetti
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-8
Journal Detail:
Title:  The journal of physical chemistry. B     Volume:  -     ISSN:  1520-5207     ISO Abbreviation:  J Phys Chem B     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-8     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101157530     Medline TA:  J Phys Chem B     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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