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

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Measuring and modeling diffuse scattering in protein X-ray crystallography [Biophysics and Computational Biology]

12-Apr-2016 | Andrew H. Van Benschoten; Lin Liu; Ana Gonzalez; Aaron S. Brewster; Nicholas K. Sauter; James S. Fraser; Michael E. Wall, Proceedings of the National Academy of Sciences current issue, 2016

X-ray diffraction has the potential to provide rich information about the structural dynamics of macromolecules. To realize this potential, both Bragg scattering, which is currently used to derive macromolecular structures, and diffuse scattering, which reports on correlations in charge density ...

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Active sites and mechanisms for H2O2 decomposition over Pd catalysts [Chemistry]

05-Apr-2016 | Anthony Plauck; Eric E. Stangland; James A. Dumesic; Manos Mavrikakis, Proceedings of the National Academy of Sciences current issue, 2016

A combination of periodic, self-consistent density functional theory (DFT-GGA-PW91) calculations, reaction kinetics experiments on a SiO2-supported Pd catalyst, and mean-field microkinetic modeling are used to probe key aspects of H2O2 decomposition on Pd in the absence of cofeeding H2. We ...

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Gold surfaces and nanoparticles are protected by Au(0)-thiyl species and are destroyed when Au(I)-thiolates form [Chemistry]

15-Mar-2016 | Jeffrey R. Reimers; Michael J. Ford; Arnab Halder; Jens Ulstrup; Noel S. Hush, Proceedings of the National Academy of Sciences current issue, 2016

The synthetic chemistry and spectroscopy of sulfur-protected gold surfaces and nanoparticles is analyzed, indicating that the electronic structure of the interface is Au(0)–thiyl, with Au(I)–thiolates identified as high-energy excited surface states. Density-functional theory indicates that it is ...

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Consumption of palatable food primes food approach behavior by rapidly increasing synaptic density in the VTA [Neuroscience]

01-Mar-2016 | Shuai Liu; Andrea K. Globa; Fergil Mills; Lindsay Naef; Min Qiao; Shernaz X. Bamji; Stephanie L. Borgland, Proceedings of the National Academy of Sciences current issue, 2016

In an environment with easy access to highly palatable and energy-dense food, food-related cues drive food-seeking regardless of satiety, an effect that can lead to obesity. The ventral tegmental area (VTA) and its mesolimbic projections are critical structures involved in the learning of ...

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Proteomics of HCV virions reveals an essential role for the nucleoporin Nup98 in virus morphogenesis [Microbiology]

01-Mar-2016 | Marion Lussignol; Martina Kopp; Kelly Molloy; Gema Vizcay-Barrena; Roland A. Fleck; Marcus Dorner; Kierstin L. Bell; ..., Proceedings of the National Academy of Sciences current issue, 2016

Hepatitis C virus (HCV) is a unique enveloped virus that assembles as a hybrid lipoviral particle by tightly interacting with host lipoproteins. As a result, HCV virions display a characteristic low buoyant density and a deceiving coat, with host-derived apolipoproteins masking viral epitopes. We ...

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Facultative cheating supports the coexistence of diverse quorum-sensing alleles [Evolution]

23-Feb-2016 | Shaul Pollak; Shira Omer-Bendori; Eran Even-Tov; Valeria Lipsman; Tasneem Bareia; Ishay Ben-Zion; Avigdor Eldar, Proceedings of the National Academy of Sciences current issue, 2016

Bacterial quorum sensing enables bacteria to cooperate in a density-dependent manner via the group-wide secretion and detection of specific autoinducer molecules. Many bacterial species show high intraspecific diversity of autoinducer–receptor alleles, called pherotypes. The autoinducer produced ...

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Stimulus-induced visual cortical networks are recapitulated by spontaneous local and interareal synchronization [Neuroscience]

02-Feb-2016 | Christopher M. Lewis; Conrado A. Bosman; Thilo Womelsdorf; Pascal Fries, Proceedings of the National Academy of Sciences current issue, 2016

Intrinsic covariation of brain activity has been studied across many levels of brain organization. Between visual areas, neuronal activity covaries primarily among portions with similar retinotopic selectivity. We hypothesized that spontaneous interareal coactivation is subserved by neuronal ...

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Onion-like glycodendrimersomes from sequence-defined Janus glycodendrimers and influence of architecture on reactivity to a lectin [Chemistry]

02-Feb-2016 | Qi Xiao; Shaodong Zhang; Zhichun Wang; Samuel E. Sherman; Ralph-Olivier Moussodia; Mihai Peterca; Adam Muncan; Dewig ..., Proceedings of the National Academy of Sciences current issue, 2016

A library of eight amphiphilic Janus glycodendrimers (GDs) with d-mannose (Man) headgroups, a known routing signal for lectin-mediated transport processes, was constructed via an iterative modular methodology. Sequence-defined variations of the Janus GD modulate the surface density and sequence ...

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Cortical cell and neuron density estimates in one chimpanzee hemisphere [Neuroscience]

19-Jan-2016 | Christine E. Collins; Emily C. Turner; Eva Kille Sawyer; Jamie L. Reed; Nicole A. Young; David K. Flaherty; Jon H. Kaas, Proceedings of the National Academy of Sciences current issue, 2016

The density of cells and neurons in the neocortex of many mammals varies across cortical areas and regions. This variability is, perhaps, most pronounced in primates. Nonuniformity in the composition of cortex suggests regions of the cortex have different specializations. Specifically, regions ...

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Evolution of South Atlantic density and chemical stratification across the last deglaciation [Earth, Atmospheric, and Planetary Sciences]

19-Jan-2016 | Jenny Roberts; Julia Gottschalk; Luke C. Skinner; Victoria L. Peck; Sev Kender; Henry Elderfield; Claire Waelbroeck; ..., Proceedings of the National Academy of Sciences current issue, 2016

Explanations of the glacial–interglacial variations in atmospheric pCO2 invoke a significant role for the deep ocean in the storage of CO2. Deep-ocean density stratification has been proposed as a mechanism to promote the storage of CO2 in the deep ocean during glacial times. A wealth of proxy ...

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