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

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matching the following criteria

Quantum tunneling observed without its characteristic large kinetic isotope effects [Chemistry]

16-Jun-2015 | Tetsuya Hama; Hirokazu Ueta; Akira Kouchi; Naoki Watanabe, Proceedings of the National Academy of Sciences current issue, 2015

Classical transition-state theory is fundamental to describing chemical kinetics; however, quantum tunneling is also important in explaining the unexpectedly large reaction efficiencies observed in many chemical systems. Tunneling is often indicated by anomalously large kinetic isotope effects ...

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Meteorite-catalyzed synthesis of nucleosides and other prebiotic compounds [Chemistry]

09-Jun-2015 | Martin Ferus; Antonín Knížek; Svatopluk Civiš, Proceedings of the National Academy of Sciences current issue, 2015

The origin of life is a longstanding enigma that fascinates scientists and the general public alike. Scientific efforts have yielded a significant amount of data over the last 100 y following a fundamental cornerstone publication: Proiskhozhozhdenie Zhizny (Origin of Life) by Alexander Ivanovich ...

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Correction for Han et al., Quantum dot/antibody conjugates for in vivo cytometric imaging in mice [Correction]

09-Jun-2015 | Proceedings of the National Academy of Sciences current issue, 2015

APPLIED BIOLOGICAL SCIENCES, CHEMISTRY Correction for “Quantum dot/antibody conjugates for in vivo cytometric imaging in mice,” by Hee-Sun Han, Elisabeth Niemeyer, Yuhui Huang, Walid S. Kamoun, John D. Martin, Jayeeta Bhaumik, Yunching Chen, Sylvie Roberge, Jian Cui, Margaret R. Martin, Dai ...

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Epigenetic changes in the developing brain: Effects on behavior [Biological Sciences]

02-Jun-2015 | Eric B. Keverne; Donald W. Pfaff; Inna Tabansky, Proceedings of the National Academy of Sciences current issue, 2015

This Sackler Colloquium encompasses a broad range of topics for the following reason. Our knowledge of the chemistry of epigenetic modifications is expanding at a rapid rate, but most of the primary discoveries in this field are made using nonneural tissue. So, neuroscientists want to learn about ...

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Thermodynamics of formation of coffinite, USiO4 [Chemistry]

26-May-2015 | Xiaofeng Guo; Stéphanie Szenknect; Adel Mesbah; Sabrina Labs; Nicolas Clavier; Christophe Poinssot; Sergey V. Ushako ..., Proceedings of the National Academy of Sciences current issue, 2015

Coffinite, USiO4, is an important U(IV) mineral, but its thermodynamic properties are not well-constrained. In this work, two different coffinite samples were synthesized under hydrothermal conditions and purified from a mixture of products. The enthalpy of formation was obtained by ...

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Rational design of self-assembly pathways for complex multicomponent structures [Chemistry]

19-May-2015 | William M. Jacobs; Aleks Reinhardt; Daan Frenkel, Proceedings of the National Academy of Sciences current issue, 2015

The field of complex self-assembly is moving toward the design of multiparticle structures consisting of thousands of distinct building blocks. To exploit the potential benefits of structures with such “addressable complexity,” we need to understand the factors that optimize the yield and the ...

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Lester Reed: A "complex" man who loved science [Retrospectives]

19-May-2015 | Marvin L. Hackert; Dean R. Appling; Alan M. Lambowitz, Proceedings of the National Academy of Sciences current issue, 2015

Lester J. Reed, a pioneer in the field of biochemistry, died peacefully in Austin, Texas on January 14, 2015 at the age of 90. Lester Reed was born in New Orleans on January 3, 1925. He showed an early interest in chemistry, having his own laboratory in a shed under...

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Visible photoelectrochemical water splitting into H2 and O2 in a dye-sensitized photoelectrosynthesis cell [Chemistry]

12-May-2015 | Leila Alibabaei; Benjamin D. Sherman; Michael R. Norris; M. Kyle Brennaman; Thomas J. Meyer, Proceedings of the National Academy of Sciences current issue, 2015

A hybrid strategy for solar water splitting is exploited here based on a dye-sensitized photoelectrosynthesis cell (DSPEC) with a mesoporous SnO2/TiO2 core/shell nanostructured electrode derivatized with a surface-bound Ru(II) polypyridyl-based chromophore–catalyst assembly. The assembly, ...

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Sensing of molecules using quantum dynamics [Chemistry]

12-May-2015 | Agostino Migliore; Ron Naaman; David N. Beratan, Proceedings of the National Academy of Sciences current issue, 2015

We design sensors where information is transferred between the sensing event and the actuator via quantum relaxation processes, through distances of a few nanometers. We thus explore the possibility of sensing using intrinsically quantum mechanical phenomena that are also at play in photobiology, ...

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In vitro selection of a sodium-specific DNAzyme and its application in intracellular sensing [Chemistry]

12-May-2015 | Seyed-Fakhreddin Torabi; Peiwen Wu; Claire E. McGhee; Lu Chen; Kevin Hwang; Nan Zheng; Jianjun Cheng; Yi Lu, Proceedings of the National Academy of Sciences current issue, 2015

Over the past two decades, enormous progress has been made in designing fluorescent sensors or probes for divalent metal ions. In contrast, the development of fluorescent sensors for monovalent metal ions, such as sodium (Na+), has remained underdeveloped, even though Na+ is one the most abundant ...

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