Source:http://linkedlifedata.com/resource/pubmed/id/19706484
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| Predicate | Object |
|---|---|
| rdf:type | |
| lifeskim:mentions | |
| pubmed:issue |
36
|
| pubmed:dateCreated |
2009-10-6
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| pubmed:abstractText |
Small-angle X-ray scattering (SAXS) is used to demonstrate the presence of density fluctuations in ambient water on a physical length-scale of approximately 1 nm; this is retained with decreasing temperature while the magnitude is enhanced. In contrast, the magnitude of fluctuations in a normal liquid, such as CCl(4), exhibits no enhancement with decreasing temperature, as is also the case for water from molecular dynamics simulations under ambient conditions. Based on X-ray emission spectroscopy and X-ray Raman scattering data we propose that the density difference contrast in SAXS is due to fluctuations between tetrahedral-like and hydrogen-bond distorted structures related to, respectively, low and high density water. We combine our experimental observations to propose a model of water as a temperature-dependent, fluctuating equilibrium between the two types of local structures driven by incommensurate requirements for minimizing enthalpy (strong near-tetrahedral hydrogen-bonds) and maximizing entropy (nondirectional H-bonds and disorder). The present results provide experimental evidence that the extreme differences anticipated in the hydrogen-bonding environment in the deeply supercooled regime surprisingly remain in bulk water even at conditions ranging from ambient up to close to the boiling point.
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| pubmed:commentsCorrections |
http://linkedlifedata.com/resource/pubmed/commentcorrection/19706484-15060287,
http://linkedlifedata.com/resource/pubmed/commentcorrection/19706484-15080715,
http://linkedlifedata.com/resource/pubmed/commentcorrection/19706484-15514152,
http://linkedlifedata.com/resource/pubmed/commentcorrection/19706484-16267132,
http://linkedlifedata.com/resource/pubmed/commentcorrection/19706484-16803246,
http://linkedlifedata.com/resource/pubmed/commentcorrection/19706484-17192402,
http://linkedlifedata.com/resource/pubmed/commentcorrection/19706484-18239117,
http://linkedlifedata.com/resource/pubmed/commentcorrection/19706484-18513031,
http://linkedlifedata.com/resource/pubmed/commentcorrection/19706484-19034938,
http://linkedlifedata.com/resource/pubmed/commentcorrection/19706484-19358575,
http://linkedlifedata.com/resource/pubmed/commentcorrection/19706484-19805244,
http://linkedlifedata.com/resource/pubmed/commentcorrection/19706484-20220097
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| pubmed:language |
eng
|
| pubmed:journal | |
| pubmed:citationSubset |
IM
|
| pubmed:chemical | |
| pubmed:status |
MEDLINE
|
| pubmed:month |
Sep
|
| pubmed:issn |
1091-6490
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| pubmed:author |
pubmed-author:BergmannUU,
pubmed-author:HaradaYY,
pubmed-author:HorikawaYY,
pubmed-author:HuangCC,
pubmed-author:LeetmaaMM,
pubmed-author:LenzAA,
pubmed-author:LjungbergM PMP,
pubmed-author:LyubartsevA PAP,
pubmed-author:NiebuhrMM,
pubmed-author:NilssonAA,
pubmed-author:NordlundDD,
pubmed-author:OjamäeLL,
pubmed-author:PetterssonL G MLG,
pubmed-author:ShinSS,
pubmed-author:TakahashiOO,
pubmed-author:TokushimaTT,
pubmed-author:WeissT MTM,
pubmed-author:WikfeldtK TKT
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| pubmed:issnType |
Electronic
|
| pubmed:day |
8
|
| pubmed:volume |
106
|
| pubmed:owner |
NLM
|
| pubmed:authorsComplete |
Y
|
| pubmed:pagination |
15214-8
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| pubmed:dateRevised |
2010-9-24
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| pubmed:meshHeading | |
| pubmed:year |
2009
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| pubmed:articleTitle |
The inhomogeneous structure of water at ambient conditions.
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| pubmed:affiliation |
Stanford Synchrotron Radiation Lightsource, P.O.B. 20450, Stanford, CA 94309, USA.
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| pubmed:publicationType |
Journal Article,
Research Support, U.S. Gov't, Non-P.H.S.,
Research Support, Non-U.S. Gov't
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