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

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matching the following criteria

Active and widespread halogen chemistry in the tropical and subtropical free troposphere [Earth, Atmospheric, and Planetary Sciences]

28-Jul-2015 | Siyuan Wang; Johan A. Schmidt; Sunil Baidar; Sean Coburn; Barbara Dix; Theodore K. Koenig; Eric Apel; Dene Bowdalo; ..., Proceedings of the National Academy of Sciences current issue, 2015

Halogens in the troposphere are increasingly recognized as playing an important role for atmospheric chemistry, and possibly climate. Bromine and iodine react catalytically to destroy ozone (O3), oxidize mercury, and modify oxidative capacity that is relevant for the lifetime of greenhouse gases. ...

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Differential sensing for the regio- and stereoselective identification and quantitation of glycerides [Chemistry]

28-Jul-2015 | Katharine L. Diehl; Michelle Adams Ivy; Scott Rabidoux; Stefan Matthias Petry; Günter Müller; Eric V. Anslyn, Proceedings of the National Academy of Sciences current issue, 2015

Glycerides are of interest to the areas of food science and medicine because they are the main component of fat. From a chemical sensing perspective, glycerides are challenging analytes because they are structurally similar to one another and lack diversity in terms of functional groups. ...

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Cysteine cathepsins are essential in lysosomal degradation of {alpha}-synuclein [Chemistry]

28-Jul-2015 | Ryan P. McGlinchey; Jennifer C. Lee, Proceedings of the National Academy of Sciences current issue, 2015

A cellular feature of Parkinson’s disease is cytosolic accumulation and amyloid formation of α-synuclein (α-syn), implicating a misregulation or impairment of protein degradation pathways involving the proteasome and lysosome. Within lysosomes, cathepsin D (CtsD), an aspartyl protease, is ...

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Light-driven generation of hydrogen: New chromophore dyads for increased activity based on Bodipy dye and Pt(diimine)(dithiolate) complexes [Chemistry]

28-Jul-2015 | Bo Zheng; Randy P. Sabatini; Wen-Fu Fu; Min-Sik Eum; William W. Brennessel; Lidong Wang; David W. McCamant; Richard ..., Proceedings of the National Academy of Sciences current issue, 2015

New dyads consisting of a strongly absorbing Bodipy (dipyrromethene-BF2) dye and a platinum diimine dithiolate (PtN2S2) charge transfer (CT) chromophore have been synthesized and studied in the context of the light-driven generation of H2 from aqueous protons. In these dyads, the Bodipy dye is ...

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Superresolution fluorescence mapping of single-nanoparticle catalysts reveals spatiotemporal variations in surface reactivity [Chemistry]

21-Jul-2015 | Yuwei Zhang; J. Matthew Lucas; Ping Song; Brandon Beberwyck; Qiang Fu; Weilin Xu; A. Paul Alivisatos, Proceedings of the National Academy of Sciences current issue, 2015

For the practical application of nanocatalysts, it is desirable to understand the spatiotemporal fluctuations of nanocatalytic activity at the single-nanoparticle level. Here we use time-lapsed superresolution mapping of single-molecule catalysis events on individual nanoparticles to observe ...

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New method to compute Rcomplete enables maximum likelihood refinement for small datasets [Chemistry]

21-Jul-2015 | Jens Luebben; Tim Gruene, Proceedings of the National Academy of Sciences current issue, 2015

The crystallographic reliability index Rcomplete is based on a method proposed more than two decades ago. Because its calculation is computationally expensive its use did not spread into the crystallographic community in favor of the cross-validation method known as Rfree. The importance of Rfree ...

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Structural dynamics and energetics underlying allosteric inactivation of the cannabinoid receptor CB1 [Chemistry]

07-Jul-2015 | Jonathan F. Fay; David L. Farrens, Proceedings of the National Academy of Sciences current issue, 2015

G protein-coupled receptors (GPCRs) are surprisingly flexible molecules that can do much more than simply turn on G proteins. Some even exhibit biased signaling, wherein the same receptor preferentially activates different G-protein or arrestin signaling pathways depending on the type of ligand ...

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Structural insights into the recognition of cisplatin and AAF-dG lesion by Rad14 (XPA) [Chemistry]

07-Jul-2015 | Sandra C. Koch; Jochen Kuper; Karola L. Gasteiger; Nina Simon; Ralf Strasser; David Eisen; Simon Geiger; Sabine Schn ..., Proceedings of the National Academy of Sciences current issue, 2015

Nucleotide excision repair (NER) is responsible for the removal of a large variety of structurally diverse DNA lesions. Mutations of the involved proteins cause the xeroderma pigmentosum (XP) cancer predisposition syndrome. Although the general mechanism of the NER process is well studied, the ...

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Less than the sum of its parts, a leinamycin precursor has superior properties [Biochemistry]

07-Jul-2015 | William P. Katt; Richard A. Cerione, Proceedings of the National Academy of Sciences current issue, 2015

It would be an understatement to suggest that natural products, complex molecules derived from natural sources, have been influential to modern chemistry. Efforts to isolate and characterize these compounds have driven innovations in chromatography, crystallography, and NMR. Attempts to recreate ...

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Self-reproducing catalyst drives repeated phospholipid synthesis and membrane growth [Chemistry]

07-Jul-2015 | Michael D. Hardy; Jun Yang; Jangir Selimkhanov; Christian M. Cole; Lev S. Tsimring; Neal K. Devaraj, Proceedings of the National Academy of Sciences current issue, 2015

Cell membranes are dynamic structures found in all living organisms. There have been numerous constructs that model phospholipid membranes. However, unlike natural membranes, these biomimetic systems cannot sustain growth owing to an inability to replenish phospholipid-synthesizing catalysts. ...

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