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

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Dirigent domain-containing protein is part of the machinery required for formation of the lignin-based Casparian strip in the root [Plant Biology]

27-08-2013 | Prashant S. Hosmani; Takehiro Kamiya; John Danku; Sadaf Naseer; Niko Geldner; Mary Lou Guerinot; David E. Salt, Proceedings of the National Academy of Sciences current issue, 2013

The endodermis acts as a “second skin” in plant roots by providing the cellular control necessary for the selective entry of water and solutes into the vascular system. To enable such control, Casparian strips span the cell wall of adjacent endodermal cells to form a tight junction that blocks ...

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Enhanced basal lubrication and the contribution of the Greenland ice sheet to future sea-level rise [Earth, Atmospheric, and Planetary Sciences]

27-08-2013 | Sarah R. Shannon; Antony J. Payne; Ian D. Bartholomew; Michiel R. van den Broeke; Tamsin L. Edwards; Xavier Fettweis ..., Proceedings of the National Academy of Sciences current issue, 2013

We assess the effect of enhanced basal sliding on the flow and mass budget of the Greenland ice sheet, using a newly developed parameterization of the relation between meltwater runoff and ice flow. A wide range of observations suggest that water generated by melt at the surface of the ice...

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In This Issue [This Week in PNAS]

20-08-2013 | Proceedings of the National Academy of Sciences current issue, 2013

From polymer physics to quicker commuter travel Optimized traffic on the London Underground. The size of each node and the thickness of each edge are proportional to the traffic through them. Whether planning water distribution routes, military convoy movements, internet traffic, or simply the ...

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Probing the mechanisms of proton transfer in liquid water [Chemistry]

20-08-2013 | Edelsys Codorniu-Hernández; Peter G. Kusalik, Proceedings of the National Academy of Sciences current issue, 2013

Despite more than two centuries of experimental and theoretical investigations aimed at understanding the mechanisms by which hydronium (H3O+) and hydroxide (HO−) ions are transported through water (1–6), unique results published in PNAS (7) reveal that these can be complex processes that ...

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Proton transport through the water gossamer [Chemistry]

20-08-2013 | Ali Hassanali; Federico Giberti; Jérôme Cuny; Thomas D. Kühne; Michele Parrinello, Proceedings of the National Academy of Sciences current issue, 2013

The diffusion of protons through water is understood within the framework of the Grotthuss mechanism, which requires that they undergo structural diffusion in a stepwise manner throughout the water network. Despite long study, this picture oversimplifies and neglects the complexity of the ...

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COPI buds 60-nm lipid droplets from reconstituted water-phospholipid-triacylglyceride interfaces, suggesting a tension clamp function [Biochemistry]

13-08-2013 | Abdou Rachid Thiam; Bruno Antonny; Jing Wang; Jérôme Delacotte; Florian Wilfling; Tobias C. Walther; Rainer Beck; Ja ..., Proceedings of the National Academy of Sciences current issue, 2013

Intracellular trafficking between organelles is achieved by coat protein complexes, coat protomers, that bud vesicles from bilayer membranes. Lipid droplets are protected by a monolayer and thus seem unsuitable targets for coatomers. Unexpectedly, coat protein complex I (COPI) is required for ...

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Reply to van Leeuwen et al.: Planning for agricultural adaptation to climate change and its consequences for conservation [Biological Sciences]

13-08-2013 | Lee Hannah; Patrick R. Roehrdanz; Makihiko Ikegami; Anderson V. Shepard; M. Rebecca Shaw; Gary Tabor; Lu Zhi; Pablo ..., Proceedings of the National Academy of Sciences current issue, 2013

Viticulture will not cease in major wine-growing regions in response to climate change, because vineyard managers will not let that happen. Adaptation measures will be taken to permit continued cultivation of wine grapes. These adaptation measures can place major stress on water resources and ...

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Why climate change will not dramatically decrease viticultural suitability in main wine-producing areas by 2050 [Biological Sciences]

13-08-2013 | Cornelis van Leeuwen; Hans R. Schultz; Iñaki Garcia de Cortazar-Atauri; Eric Duchêne; Nathalie Ollat; Philippe Pieri ..., Proceedings of the National Academy of Sciences current issue, 2013

Hannah et al. (1) recently published a comprehensive study showing substantial impacts of climate change on viticultural suitability, leading to potential ecological issues. We agree that expansion of viticulture into new areas can lead to a decrease in biodiversity and that an increase in water ...

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The case for distributed irrigation as a development priority in sub-Saharan Africa [Sustainability Science]

30-07-2013 | Jennifer A. Burney; Rosamond L. Naylor; Sandra L. Postel, Proceedings of the National Academy of Sciences current issue, 2013

Distributed irrigation systems are those in which the water access (via pump or human power), distribution (via furrow, watering can, sprinkler, drip lines, etc.), and use all occur at or near the same location. Distributed systems are typically privately owned and managed by individuals or ...

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Universal fractal scaling in stream chemistry and its implications for solute transport and water quality trend detection [Environmental Sciences]

23-07-2013 | James W. Kirchner; Colin Neal, Proceedings of the National Academy of Sciences current issue, 2013

The chemical dynamics of lakes and streams affect their suitability as aquatic habitats and as water supplies for human needs. Because water quality is typically monitored only weekly or monthly, however, the higher-frequency dynamics of stream chemistry have remained largely invisible. To ...

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