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

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matching the following criteria

An Mn(V)-oxo role in splitting water? [Chemistry]

28-Apr-2015 | R. David Britt; Daniel L. M. Suess; Troy A. Stich, Proceedings of the National Academy of Sciences current issue, 2015

The oxygen-evolving complex (OEC) of photosystem II (PSII) uses the full spectrum of visible light to oxidize water, producing O2 and bioactivated electrons and protons (1, 2). The unique nature of this crucial bioenergetic reaction has led to much interest in harnessing analogous photochemistry ...

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High-throughput patterning of photonic structures with tunable periodicity [Chemistry]

28-Apr-2015 | Thomas J. Kempa; D. Kwabena Bediako; Sun-Kyung Kim; Hong-Gyu Park; Daniel G. Nocera, Proceedings of the National Academy of Sciences current issue, 2015

A patterning method termed “RIPPLE” (reactive interface patterning promoted by lithographic electrochemistry) is applied to the fabrication of arrays of dielectric and metallic optical elements. This method uses cyclic voltammetry to impart patterns onto the working electrode of a standard ...

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Ideal probe single-molecule experiments reveal the intrinsic dynamic heterogeneity of a supercooled liquid [Chemistry]

21-Apr-2015 | Keewook Paeng; Heungman Park; Dat Tien Hoang; Laura J. Kaufman, Proceedings of the National Academy of Sciences current issue, 2015

The concept of dynamic heterogeneity and the picture of the supercooled liquid as a mosaic of environments with distinct dynamics that interchange in time have been invoked to explain the nonexponential relaxations measured in these systems. The spatial extent and temporal persistence of these ...

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Base-enhanced catalytic water oxidation by a carboxylate-bipyridine Ru(II) complex [Chemistry]

21-Apr-2015 | Na Song; Javier J. Concepcion; Robert A. Binstead; Jennifer A. Rudd; Aaron K. Vannucci; Christopher J. Dares; Michae ..., Proceedings of the National Academy of Sciences current issue, 2015

In aqueous solution above pH 2.4 with 4% (vol/vol) CH3CN, the complex [RuII(bda)(isoq)2] (bda is 2,2′-bipyridine-6,6′-dicarboxylate; isoq is isoquinoline) exists as the open-arm chelate, [RuII(CO2-bpy-CO2−)(isoq)2(NCCH3)], as shown by 1H and 13C-NMR, X-ray crystallography, and pH titrations. ...

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Mimicking the magnetic properties of rare earth elements using superatoms [Chemistry]

21-Apr-2015 | Shi-Bo Cheng; Cuneyt Berkdemir; A. W. Castleman Jr., Proceedings of the National Academy of Sciences current issue, 2015

Rare earth elements (REs) consist of a very important group in the periodic table that is vital to many modern technologies. The mining process, however, is extremely damaging to the environment, making them low yield and very expensive. Therefore, mimicking the properties of REs in a superatom ...

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Evidence for tunneling in base-catalyzed isomerization of glyceraldehyde to dihydroxyacetone by hydride shift under formose conditions [Biochemistry]

07-Apr-2015 | Liang Cheng; Charles Doubleday; Ronald Breslow, Proceedings of the National Academy of Sciences current issue, 2015

Hydrogen atom transfer reactions between the aldose and ketose are key mechanistic features in formose chemistry by which formaldehyde is converted to higher sugars under credible prebiotic conditions. For one of these transformations, we have investigated whether hydrogen tunneling makes a ...

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Genetic and biochemical investigations of the role of MamP in redox control of iron biomineralization in Magnetospirillum magneticum [Chemistry]

31-Mar-2015 | Stephanie R. Jones; Tiffany D. Wilson; Margaret E. Brown; Lilah Rahn-Lee; Yi Yu; Laura L. Fredriksen; Ertan Ozyamak; ..., Proceedings of the National Academy of Sciences current issue, 2015

Magnetotactic bacteria have evolved complex subcellular machinery to construct linear chains of magnetite nanocrystals that allow the host cell to sense direction. Each mixed-valent iron nanoparticle is mineralized from soluble iron within a membrane-encapsulated vesicle termed the magnetosome, ...

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Heme-thiolate ferryl of aromatic peroxygenase is basic and reactive [Chemistry]

24-Mar-2015 | Xiaoshi Wang; René Ullrich; Martin Hofrichter; John T. Groves, Proceedings of the National Academy of Sciences current issue, 2015

A kinetic and spectroscopic characterization of the ferryl intermediate (APO-II) from APO, the heme-thiolate peroxygenase from Agrocybe aegerita, is described. APO-II was generated by reaction of the ferric enzyme with metachloroperoxybenzoic acid in the presence of nitroxyl radicals and detected ...

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Locating landmarks on high-dimensional free energy surfaces [Chemistry]

17-Mar-2015 | Ming Chen; Tang-Qing Yu; Mark E. Tuckerman, Proceedings of the National Academy of Sciences current issue, 2015

Coarse graining of complex systems possessing many degrees of freedom can often be a useful approach for analyzing and understanding key features of these systems in terms of just a few variables. The relevant energy landscape in a coarse-grained description is the free energy surface as a ...

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Spray-combustion synthesis: Efficient solution route to high-performance oxide transistors [Chemistry]

17-Mar-2015 | Xinge Yu; Jeremy Smith; Nanjia Zhou; Li Zeng; Peijun Guo; Yu Xia; Ana Alvarez; Stefano Aghion; Hui Lin; Junsheng Yu; ..., Proceedings of the National Academy of Sciences current issue, 2015

Metal-oxide (MO) semiconductors have emerged as enabling materials for next generation thin-film electronics owing to their high carrier mobilities, even in the amorphous state, large-area uniformity, low cost, and optical transparency, which are applicable to flat-panel displays, flexible ...

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