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

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matching the following criteria

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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Multiple patterns of polymer gels in microspheres due to the interplay among phase separation, wetting, and gelation [Applied Physical Sciences]

11-Nov-2014 | Miho Yanagisawa; Shinpei Nigorikawa; Takahiro Sakaue; Kei Fujiwara; Masayuki Tokita, Proceedings of the National Academy of Sciences current issue, 2014

We report the spontaneous patterning of polymer microgels by confining a polymer blend within microspheres. A poly(ethylene glycol) (PEG) and gelatin solution was confined inside water-in-oil (W/O) microdroplets coated with a layer of zwitterionic lipids: dioleoylphosphatidylethanolamine (PE) and ...

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In This Issue [This Week in PNAS]

04-Nov-2014 | Proceedings of the National Academy of Sciences current issue, 2014

Reconstructing pesticide use from lake sediments Lake Saint André in the French Alps and its vineyard watershed. N. Cayla (EDYTEM Lab, Le Bourget-du-Lac, France). Pesticides and their derivatives can persist in the environment for decades, but the dynamics of their movement from the soil to ...

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Sea level and global ice volumes from the Last Glacial Maximum to the Holocene [Earth, Atmospheric, and Planetary Sciences]

28-Oct-2014 | Kurt Lambeck; Hélène Rouby; Anthony Purcell; Yiying Sun; Malcolm Sambridge, Proceedings of the National Academy of Sciences current issue, 2014

The major cause of sea-level change during ice ages is the exchange of water between ice and ocean and the planet’s dynamic response to the changing surface load. Inversion of ∼1,000 observations for the past 35,000 y from localities far from former ice margins has provided new constraints on ...

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The negligible chondritic contribution in the lunar soils water [Earth, Atmospheric, and Planetary Sciences]

21-Oct-2014 | Alice Stephant; François Robert, Proceedings of the National Academy of Sciences current issue, 2014

Recent data from Apollo samples demonstrate the presence of water in the lunar interior and at the surface, challenging previous assumption that the Moon was free of water. However, the source(s) of this water remains enigmatic. The external flux of particles and solid materials that reach the ...

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Neuronal mechanism for acute mechanosensitivity in tactile-foraging waterfowl [Physiology]

14-Oct-2014 | Eve R. Schneider; Marco Mastrotto; Willem J. Laursen; Vincent P. Schulz; Jena B. Goodman; Owen H. Funk; Patrick G. G ..., Proceedings of the National Academy of Sciences current issue, 2014

Relying almost exclusively on their acute sense of touch, tactile-foraging birds can feed in murky water, but the cellular mechanism is unknown. Mechanical stimuli activate specialized cutaneous end organs in the bill, innervated by trigeminal afferents. We report that trigeminal ganglia (TG) of ...

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