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

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Correlating steric hydration forces with water dynamics through surface force and diffusion NMR measurements in a lipid-DMSO-H2O system [Biophysics and Computational Biology]

25-Aug-2015 | Alex M. Schrader; Stephen H. Donaldson Jr.; Jinsuk Song; Chi-Yuan Cheng; Dong Woog Lee; Songi Han; Jacob N. Israelac ..., Proceedings of the National Academy of Sciences current issue, 2015

Dimethyl sulfoxide (DMSO) is a common solvent and biological additive possessing well-known utility in cellular cryoprotection and lipid membrane permeabilization, but the governing mechanisms at membrane interfaces remain poorly understood. Many studies have focused on DMSO–lipid interactions ...

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Direct calculation of ice homogeneous nucleation rate for a molecular model of water [Applied Physical Sciences]

25-Aug-2015 | Amir Haji-Akbari; Pablo G. Debenedetti, Proceedings of the National Academy of Sciences current issue, 2015

Ice formation is ubiquitous in nature, with important consequences in a variety of environments, including biological cells, soil, aircraft, transportation infrastructure, and atmospheric clouds. However, its intrinsic kinetics and microscopic mechanism are difficult to discern with current ...

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21st century United States emissions mitigation could increase water stress more than the climate change it is mitigating [Sustainability Science]

25-Aug-2015 | Mohamad I. Hejazi; Nathalie Voisin; Lu Liu; Lisa M. Bramer; Daniel C. Fortin; John E. Hathaway; Maoyi Huang; Page Ky ..., Proceedings of the National Academy of Sciences current issue, 2015

There is evidence that warming leads to greater evapotranspiration and surface drying, thus contributing to increasing intensity and duration of drought and implying that mitigation would reduce water stresses. However, understanding the overall impact of climate change mitigation on water ...

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The MYB36 transcription factor orchestrates Casparian strip formation [Plant Biology]

18-Aug-2015 | Takehiro Kamiya; Monica Borghi; Peng Wang; John M. C. Danku; Lothar Kalmbach; Prashant S. Hosmani; Sadaf Naseer; Tor ..., Proceedings of the National Academy of Sciences current issue, 2015

The endodermis in roots acts as a selectivity filter for nutrient and water transport essential for growth and development. This selectivity is enabled by the formation of lignin-based Casparian strips. Casparian strip formation is initiated by the localization of the Casparian strip domain ...

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At14a-Like1 participates in membrane-associated mechanisms promoting growth during drought in Arabidopsis thaliana [Plant Biology]

18-Aug-2015 | M. Nagaraj Kumar; Yi-Fang Hsieh; Paul E. Verslues, Proceedings of the National Academy of Sciences current issue, 2015

Limited knowledge of how plants regulate their growth and metabolism in response to drought and reduced soil water potential has impeded efforts to improve stress tolerance. Increased expression of the membrane-associated protein At14a-like1 (AFL1) led to increased growth and accumulation of the ...

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Highly permeable artificial water channels that can self-assemble into two-dimensional arrays [Biophysics and Computational Biology]

11-Aug-2015 | Yue-xiao Shen; Wen Si; Mustafa Erbakan; Karl Decker; Rita De Zorzi; Patrick O. Saboe; You Jung Kang; Sheereen Majd; ..., Proceedings of the National Academy of Sciences current issue, 2015

Bioinspired artificial water channels aim to combine the high permeability and selectivity of biological aquaporin (AQP) water channels with chemical stability. Here, we carefully characterized a class of artificial water channels, peptide-appended pillar[5]arenes (PAPs). The average ...

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Decadal acidification in the water masses of the Atlantic Ocean [Environmental Sciences]

11-Aug-2015 | Aida F. Ríos; Laure Resplandy; Maribel I. García-Ibáñez; Noelia M. Fajar; Anton Velo; Xose A. Padin; Rik Wanninkhof; ..., Proceedings of the National Academy of Sciences current issue, 2015

Global ocean acidification is caused primarily by the ocean’s uptake of CO2 as a consequence of increasing atmospheric CO2 levels. We present observations of the oceanic decrease in pH at the basin scale (50°S–36°N) for the Atlantic Ocean over two decades (1993–2013). Changes in pH associated ...

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A genetic basis of variation in eccrine sweat gland and hair follicle density [Developmental Biology]

11-Aug-2015 | Yana G. Kamberov; Elinor K. Karlsson; Gerda L. Kamberova; Daniel E. Lieberman; Pardis C. Sabeti; Bruce A. Morgan; Cl ..., Proceedings of the National Academy of Sciences current issue, 2015

Among the unique features of humans, one of the most salient is the ability to effectively cool the body during extreme prolonged activity through the evapotranspiration of water on the skin’s surface. The evolution of this novel physiological ability required a dramatic increase in the density ...

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Phytoplankton-bacterial interactions mediate micronutrient colimitation at the coastal Antarctic sea ice edge [Environmental Sciences]

11-Aug-2015 | Erin M. Bertrand; John P. McCrow; Ahmed Moustafa; Hong Zheng; Jeffrey B. McQuaid; Tom O. Delmont; Anton F. Post; Rac ..., Proceedings of the National Academy of Sciences current issue, 2015

Southern Ocean primary productivity plays a key role in global ocean biogeochemistry and climate. At the Southern Ocean sea ice edge in coastal McMurdo Sound, we observed simultaneous cobalamin and iron limitation of surface water phytoplankton communities in late Austral summer. Cobalamin is ...

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Size distribution of particles in Saturn's rings from aggregation and fragmentation [Earth, Atmospheric, and Planetary Sciences]

04-Aug-2015 | Nikolai Brilliantov; P. L. Krapivsky; Anna Bodrova; Frank Spahn; Hisao Hayakawa; Vladimir Stadnichuk; Jürgen Schmidt, Proceedings of the National Academy of Sciences current issue, 2015

Saturn’s rings consist of a huge number of water ice particles, with a tiny addition of rocky material. They form a flat disk, as the result of an interplay of angular momentum conservation and the steady loss of energy in dissipative interparticle collisions. For particles in the size range ...

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