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[Report] A 12 Å carotenoid translocation in a photoswitch associated with cyanobacterial photoprotection

26-Jun-2015 | Ryan L. Leverenz; Markus Sutter; Adjélé Wilson; Sayan Gupta; Adrien Thurotte; Céline Bourcier de Carbon; Christopher ..., Science , 2015

Pigment-protein and pigment-pigment interactions are of fundamental importance to the light-harvesting and photoprotective functions essential to oxygenic photosynthesis. The orange carotenoid protein (OCP) functions as both a sensor of light and effector of photoprotective energy dissipation in ...

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[Policy Forum] After the Iran deal: Multinational enrichment

19-Jun-2015 | Alexander Glaser; Zia Mian; Frank von Hippel, Science , 2015

In April 2015, Iran and the E3+3 nations (France, Germany, and the United Kingdom, plus China, Russia, and the United States) negotiated a framework for a “comprehensive solution that will ensure the exclusively peaceful nature of the Iranian nuclear program” (1, 2). The final settlement, ...

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[Report] Long-lived photoinduced polaron formation in conjugated polyelectrolyte-fullerene assemblies

19-Jun-2015 | Rachel C. Huber; Amy S. Ferreira; Robert Thompson; Daniel Kilbride; Nicholas S. Knutson; Lekshmi Sudha Devi; Daniel ..., Science , 2015

The efficiency of biological photosynthesis results from the exquisite organization of photoactive elements that promote rapid movement of charge carriers out of a critical recombination range. If synthetic organic photovoltaic materials could mimic this assembly, charge separation and collection ...

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[Perspective] Can climate feel the pressure?

12-Jun-2015 | Daniel J. Peppe; Dana L. Royer, Science , 2015

Atmospheric carbon dioxide (CO2) concentrations are widely held to be the main driver of climate change through the Phanerozoic (the past 541 million years), with warm intervals corresponding to high CO2 concentrations and cold intervals having low CO2 concentrations (1) (see the figure). ...

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[In Depth] Hawaii's governor proposes telescope swap

05-Jun-2015 | Adrian Cho; Ilima Loomis, Science , 2015

A proposed solution to the impasse over construction of the mammoth new Thirty Meter Telescope (TMT) on Hawaii's Mauna Kea volcano is less bold than it seems—and potentially more difficult. The proposal, to dismantle one-quarter of Mauna Kea's 13 existing telescopes in return for allowing ...

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[Review] Function-led design of new porous materials

29-May-2015 | Anna G. Slater; Andrew I. Cooper, Science , 2015

Porous solids are important as membranes, adsorbents, catalysts, and in other chemical applications. But for these materials to find greater use at an industrial scale, it is necessary to optimize multiple functions in addition to pore structure and surface area, such as stability, sorption ...

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[Report] A virus that infects a hyperthermophile encapsidates A-form DNA

22-May-2015 | Frank DiMaio; Xiong Yu; Elena Rensen; Mart Krupovic; David Prangishvili; Edward H. Egelman, Science , 2015

Extremophiles, microorganisms thriving in extreme environmental conditions, must have proteins and nucleic acids that are stable at extremes of temperature and pH. The nonenveloped, rod-shaped virus SIRV2 (Sulfolobus islandicus rod-shaped virus 2) infects the hyperthermophilic acidophile ...

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[Perspective] Committing to ecological restoration

08-May-2015 | Katharine Suding; Eric Higgs; Margaret Palmer; J. Baird Callicott; Christopher B. Anderson; Matthew Baker; John J. G ..., Science , 2015

At the September 2014 United Nations Climate Summit, governments rallied around an international agreement—the New York Declaration on Forests—that underscored restoration of degraded ecosystems as an auspicious solution to climate change. Ethiopia committed to restore more than one-sixth of its ...

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[Perspective] A chaotic approach clears up imaging

10-Apr-2015 | Harald G. L. Schwefel; Hakan E. Türeci, Science , 2015

Lasers appear to be ideal light sources for a variety of projection and imaging systems because of their spectral brightness and their ability to produce a beam of light that can be tightly collimated to travel long distances. Lasers owe these extraordinary properties to a quality called ...

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[Research Article] Dynamic DNA devices and assemblies formed by shape-complementary, non–base pairing 3D components

27-Mar-2015 | Thomas Gerling; Klaus F. Wagenbauer; Andrea M. Neuner; Hendrik Dietz, Science , 2015

We demonstrate that discrete three-dimensional (3D) DNA components can specifically self-assemble in solution on the basis of shape-complementarity and without base pairing. Using this principle, we produced homo- and heteromultimeric objects, including micrometer-scale one- and two-stranded ...

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