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421 Newest Publications in proceedings of the national academy of sciences current issue

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matching the following criteria

Site-specific vibrational spectral signatures of water molecules in the magic H3O+(H2O)20 and Cs+(H2O)20 clusters [Chemistry]

23-Dec-2014 | Joseph A. Fournier; Conrad T. Wolke; Christopher J. Johnson; Mark A. Johnson; Nadja Heine; Sandy Gewinner; Wieland S ..., Proceedings of the National Academy of Sciences current issue, 2014

Theoretical models of proton hydration with tens of water molecules indicate that the excess proton is embedded on the surface of clathrate-like cage structures with one or two water molecules in the interior. The evidence for these structures has been indirect, however, because the experimental ...

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In This Issue [This Week in PNAS]

16-Dec-2014 | Proceedings of the National Academy of Sciences current issue, 2014

Thermodynamics of nuclear waste in water The long-term stability and fate of radioactive uranium oxides depend in part on the mineral phase containing the uranium, because some mineral phases degrade and dissolve more readily than others. Xiaofeng Guo et al. (pp. 17737–17742) investigated the ...

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Preserving ancient artifacts for the next millennia [Chemistry]

16-Dec-2014 | Samuel L. Zelinka, Proceedings of the National Academy of Sciences current issue, 2014

When wood is kept dry, it can remain intact for millennia, as evidenced by numerous artifacts from ancient Egypt (1). However, when wood interacts with water, numerous problems arise that can cause the wood to become permanently damaged or destroyed completely. Wood exhibits swelling on moisture ...

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Inner Workings: A soft robot that swims like a fish [Inner Workings]

16-Dec-2014 | Stephen Ornes, Proceedings of the National Academy of Sciences current issue, 2014

The creature that inhabits a 90-gal tank in the laboratory of Massachusetts Institute of Technology (MIT) computer scientist Daniela Rus looks, moves, and turns like a real fish, although it will never need food, fresh water, or a fake coral reef to stay entertained. It does require a fresh ...

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Observation of ice-like water layers at an aqueous protein surface [Biophysics and Computational Biology]

16-Dec-2014 | Konrad Meister; Simona Strazdaite; Arthur L. DeVries; Stephan Lotze; Luuk L. C. Olijve; Ilja K. Voets; Huib J. Bakker, Proceedings of the National Academy of Sciences current issue, 2014

We study the properties of water at the surface of an antifreeze protein with femtosecond surface sum frequency generation spectroscopy. We find clear evidence for the presence of ice-like water layers at the ice-binding site of the protein in aqueous solution at temperatures above the freezing ...

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In This Issue [This Week in PNAS]

09-Dec-2014 | Proceedings of the National Academy of Sciences current issue, 2014

Chemical gardens in quasi-2D Chemical gardens in confined geometry. When clumps of some solid metal salts are dropped into an anionic solution such as water glass, the salts tend to precipitate into a dazzling array of crystals with tendrils and offshoots that resemble a lush garden. Chemical ...

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Anomalously large isotope effect in the glass transition of water [Physics]

09-Dec-2014 | Catalin Gainaru; Alexander L. Agapov; Violeta Fuentes-Landete; Katrin Amann-Winkel; Helge Nelson; Karsten W. Köster; ..., Proceedings of the National Academy of Sciences current issue, 2014

We present the discovery of an unusually large isotope effect in the structural relaxation and the glass transition temperature Tg of water. Dielectric relaxation spectroscopy of low-density as well as of vapor-deposited amorphous water reveal Tg differences of 10 ± 2 K between H2O and D2O, ...

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Orbital apocenter is not a sufficient condition for HST/STIS detection of Europa's water vapor aurora [Earth, Atmospheric, and Planetary Sciences]

02-Dec-2014 | Lorenz Roth; Kurt D. Retherford; Joachim Saur; Darrell F. Strobel; Paul D. Feldman; Melissa A. McGrath; Francis Nimmo, Proceedings of the National Academy of Sciences current issue, 2014

We report far-ultraviolet observations of Jupiter’s moon Europa taken by Space Telescope Imaging Spectrograph (STIS) of the Hubble Space Telescope (HST) in January and February 2014 to test the hypothesis that the discovery of a water vapor aurora in December 2012 by local hydrogen (H) and oxygen ...

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Far-infrared surface emissivity and climate [Earth, Atmospheric, and Planetary Sciences]

18-Nov-2014 | Daniel R. Feldman; William D. Collins; Robert Pincus; Xianglei Huang; Xiuhong Chen, Proceedings of the National Academy of Sciences current issue, 2014

Presently, there are no global measurement constraints on the surface emissivity at wavelengths longer than 15 μm, even though this surface property in this far-IR region has a direct impact on the outgoing longwave radiation (OLR) and infrared cooling rates where the column precipitable water ...

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Phosphorus is a key component of the resource demands for meat, eggs, and dairy production in the United States [Physical Sciences]

18-Nov-2014 | Geneviève S. Metson; Val H. Smith; Dana J. Cordell; David A. Vaccari; James J. Elser; Elena M. Bennett, Proceedings of the National Academy of Sciences current issue, 2014

Eshel et al. (1) quantify the land, irrigation water, and reactive nitrogen demands of feed production, and calculate a full life cycle of greenhouse gas emission estimates for each of the five major animal-based categories in the United States diet: dairy, beef, poultry, pork, and eggs. The ...

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