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

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Role of pendant proton relays and proton-coupled electron transfer on the hydrogen evolution reaction by nickel hangman porphyrins [Chemistry]

21-10-2014 | D. Kwabena Bediako; Brian H. Solis; Dilek K. Dogutan; Manolis M. Roubelakis; Andrew G. Maher; Chang Hoon Lee; Matthe ..., Proceedings of the National Academy of Sciences current issue, 2014

The hangman motif provides mechanistic insights into the role of pendant proton relays in governing proton-coupled electron transfer (PCET) involved in the hydrogen evolution reaction (HER). We now show improved HER activity of Ni compared with Co hangman porphyrins. Cyclic voltammogram data and ...

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Density-based separation in multiphase systems provides a simple method to identify sickle cell disease [Applied Physical Sciences]

14-10-2014 | Ashok A. Kumar; Matthew R. Patton; Jonathan W. Hennek; Si Yi Ryan Lee; Gaetana D’Alesio-Spina; Xiaoxi Yang; Julie Ka ..., Proceedings of the National Academy of Sciences current issue, 2014

Although effective low-cost interventions exist, child mortality attributable to sickle cell disease (SCD) remains high in low-resource areas due, in large part, to the lack of accessible diagnostic methods. The presence of dense (ρ > 1.120 g/cm3) cells is characteristic of SCD. The fluid, ...

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Multimonth controlled small molecule release from biodegradable thin films [Medical Sciences]

19-08-2014 | Bryan B. Hsu; Myoung-Hwan Park; Samantha R. Hagerman; Paula T. Hammond, Proceedings of the National Academy of Sciences current issue, 2014

Long-term, localized delivery of small molecules from a biodegradable thin film is challenging owing to their low molecular weight and poor charge density. Accomplishing highly extended controlled release can facilitate high therapeutic levels in specific regions of the body while significantly ...

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Direct phase-sensitive identification of a d-form factor density wave in underdoped cuprates [Physics]

29-07-2014 | Kazuhiro Fujita; Mohammad H. Hamidian; Stephen D. Edkins; Chung Koo Kim; Yuhki Kohsaka; Masaki Azuma; Mikio Takano; ..., Proceedings of the National Academy of Sciences current issue, 2014

The identity of the fundamental broken symmetry (if any) in the underdoped cuprates is unresolved. However, evidence has been accumulating that this state may be an unconventional density wave. Here we carry out site-specific measurements within each CuO2 unit cell, segregating the results into ...

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Charge transport and rectification in molecular junctions formed with carbon-based electrodes [Chemistry]

29-07-2014 | Taekyeong Kim; Zhen-Fei Liu; Chulho Lee; Jeffrey B. Neaton; Latha Venkataraman, Proceedings of the National Academy of Sciences current issue, 2014

Molecular junctions formed using the scanning-tunneling-microscope–based break-junction technique (STM-BJ) have provided unique insight into charge transport at the nanoscale. In most prior work, the same metal, typically Au, Pt, or Ag, is used for both tip and substrate. For such noble metal ...

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Induced plant defenses, host-pathogen interactions, and forest insect outbreaks [Ecology]

10-09-2013 | Bret D. Elderd; Brian J. Rehill; Kyle J. Haynes; Greg Dwyer, Proceedings of the National Academy of Sciences current issue, 2013

Cyclic outbreaks of defoliating insects devastate forests, but their causes are poorly understood. Outbreak cycles are often assumed to be driven by density-dependent mortality due to natural enemies, because pathogens and predators cause high mortality and because natural-enemy models reproduce ...

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Surge of neurophysiological coherence and connectivity in the dying brain [Neuroscience]

27-08-2013 | Jimo Borjigin; UnCheol Lee; Tiecheng Liu; Dinesh Pal; Sean Huff; Daniel Klarr; Jennifer Sloboda; Jason Hernandez; Mi ..., Proceedings of the National Academy of Sciences current issue, 2013

The brain is assumed to be hypoactive during cardiac arrest. However, the neurophysiological state of the brain immediately following cardiac arrest has not been systematically investigated. In this study, we performed continuous electroencephalography in rats undergoing experimental cardiac ...

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Hyperuniformity in amorphous silicon based on the measurement of the infinite-wavelength limit of the structure factor [Applied Physical Sciences]

13-08-2013 | Ruobing Xie; Gabrielle G. Long; Steven J. Weigand; Simon C. Moss; Tobi Carvalho; Sjoerd Roorda; Miroslav Hejna; Salv ..., Proceedings of the National Academy of Sciences current issue, 2013

We report the results of highly sensitive transmission X-ray scattering measurements performed at the Advanced Photon Source, Argonne National Laboratory, on nearly fully dense high-purity amorphous-silicon (a-Si) samples for the purpose of determining their degree of hyperuniformity. A perfectly ...

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Climate, fishing, and fluctuations of sardine and anchovy in the California Current [Population Biology]

13-08-2013 | Martin Lindegren; David M. Checkley, Jr.; Tristan Rouyer; Alec D. MacCall; Nils Chr. Stenseth, Proceedings of the National Academy of Sciences current issue, 2013

Since the days of Elton, population cycles have challenged ecologists and resource managers. Although the underlying mechanisms remain debated, theory holds that both density-dependent and density-independent processes shape the dynamics. One striking example is the large-scale fluctuations of ...

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Reply to Mouesca et al.: Electronic structure of the proximal [4Fe-3S] cluster of O2-tolerant [NiFe] hydrogenases [Biological Sciences]

09-07-2013 | Maria-Eirini Pandelia; Dmytro Bykov; Robert Izsak; Pascale Infossi; Marie-Thérèse Giudici-Orticoni; Eckhard Bill; Fr ..., Proceedings of the National Academy of Sciences current issue, 2013

Mouesca et al. (1) criticize our analysis (2) of the superoxidized proximal [4Fe-3S]5+ cluster in O2-tolerant hydrogenases (A) that was also studied in Volbeda et al. (3), albeit from a different organism. Both analyses were based on broken-symmetry (BS) density functional theory (DFT) ...

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