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

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matching the following criteria

Anomalous behavior of water inside the SecY translocon [Biophysics and Computational Biology]

21-Jul-2015 | Sara Capponi; Matthias Heyden; Ana-Nicoleta Bondar; Douglas J. Tobias; Stephen H. White, Proceedings of the National Academy of Sciences current issue, 2015

The heterotrimeric SecY translocon complex is required for the cotranslational assembly of membrane proteins in bacteria and archaea. The insertion of transmembrane (TM) segments during nascent-chain passage through the translocon is generally viewed as a simple partitioning process between the ...

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How fish power suction feeding [Evolution]

14-Jul-2015 | Mark W. Westneat; Aaron M. Olsen, Proceedings of the National Academy of Sciences current issue, 2015

If you go fishing and cast your lure out across a pond, settling it skillfully by the lily pads, you may see the water drop out from under your bait with a sucking whirlpool as you engage with the most popular sport fish in the world, the largemouth bass. Almost...

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Integrated reactive nitrogen budgets and future trends in China [Environmental Sciences]

14-Jul-2015 | Baojing Gu; Xiaotang Ju; Jie Chang; Ying Ge; Peter M. Vitousek, Proceedings of the National Academy of Sciences current issue, 2015

Reactive nitrogen (Nr) plays a central role in food production, and at the same time it can be an important pollutant with substantial effects on air and water quality, biological diversity, and human health. China now creates far more Nr than any other country. We developed a budget for Nr...

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Swimming muscles power suction feeding in largemouth bass [Evolution]

14-Jul-2015 | Ariel L. Camp; Thomas J. Roberts; Elizabeth L. Brainerd, Proceedings of the National Academy of Sciences current issue, 2015

Most aquatic vertebrates use suction to capture food, relying on rapid expansion of the mouth cavity to accelerate water and food into the mouth. In ray-finned fishes, mouth expansion is both fast and forceful, and therefore requires considerable power. However, the cranial muscles of these ...

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Virtual groundwater transfers from overexploited aquifers in the United States [Sustainability Science]

14-Jul-2015 | Landon Marston; Megan Konar; Ximing Cai; Tara J. Troy, Proceedings of the National Academy of Sciences current issue, 2015

The High Plains, Mississippi Embayment, and Central Valley aquifer systems within the United States are currently being overexploited for irrigation water supplies. The unsustainable use of groundwater resources in all three aquifer systems intensified from 2000 to 2008, making it imperative that ...

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Effect of salt on the H-bond symmetrization in ice [Physics]

07-Jul-2015 | Livia Eleonora Bove; Richard Gaal; Zamaan Raza; Adriaan-Alexander Ludl; Stefan Klotz; Antonino Marco Saitta; Alexand ..., Proceedings of the National Academy of Sciences current issue, 2015

The richness of the phase diagram of water reduces drastically at very high pressures where only two molecular phases, proton-disordered ice VII and proton-ordered ice VIII, are known. Both phases transform to the centered hydrogen bond atomic phase ice X above about 60 GPa, i.e., at pressures ...

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Disruption of prostaglandin E2 receptor EP4 impairs urinary concentration via decreasing aquaporin 2 in renal collecting ducts [Medical Sciences]

07-Jul-2015 | Min Gao; Rong Cao; Shengnan Du; Xiao Jia; Senfeng Zheng; Shizheng Huang; Qifei Han; Jia Liu; Xiaoyan Zhang; Yifei Mi ..., Proceedings of the National Academy of Sciences current issue, 2015

The antidiuretic hormone arginine vasopressin is a systemic effector in urinary concentration. However, increasing evidence suggests that other locally produced factors may also play an important role in the regulation of water reabsorption in renal collecting ducts. Recently, prostaglandin E2 ...

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"Ocean stoichiometry, global carbon, and climate" [Environmental Sciences]

07-Jul-2015 | Robert W. Sterner, Proceedings of the National Academy of Sciences current issue, 2015

Autotrophs bridge the nonliving (CO2) and living (organic carbon) realms by fixing carbon through photosynthesis. All life is based on multiple functions that differ in their elemental requirements, and homeostasis of cellular composition is one of the hallmarks of life. Nevertheless, autotrophs ...

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Solid-liquid critical behavior of water in nanopores [Physics]

07-Jul-2015 | Kenji Mochizuki; Kenichiro Koga, Proceedings of the National Academy of Sciences current issue, 2015

Nanoconfined liquid water can transform into low-dimensional ices whose crystalline structures are dissimilar to any bulk ices and whose melting point may significantly rise with reducing the pore size, as revealed by computer simulation and confirmed by experiment. One of the intriguing, and as ...

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Pathways to dewetting in hydrophobic confinement [Applied Physical Sciences]

07-Jul-2015 | Richard C. Remsing; Erte Xi; Srivathsan Vembanur; Sumit Sharma; Pablo G. Debenedetti; Shekhar Garde; Amish J. Patel, Proceedings of the National Academy of Sciences current issue, 2015

Liquid water can become metastable with respect to its vapor in hydrophobic confinement. The resulting dewetting transitions are often impeded by large kinetic barriers. According to macroscopic theory, such barriers arise from the free energy required to nucleate a critical vapor tube that spans ...

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