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187 Newest Publications about the topic solution

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Analysis of the size dependence of macromolecular crowding shows that smaller is better [Biophysics and Computational Biology]

30-Jun-2015 | Kim A. Sharp, Proceedings of the National Academy of Sciences current issue, 2015

The aqueous milieu inside cells contains as much as 30–40% dissolved protein and RNA by volume. This large concentration of macromolecules is expected to cause significant deviations from solution ideality. In vivo biochemical reaction rates and equilibria might differ significantly from those ...

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Identification of a triplet pair intermediate in singlet exciton fission in solution [Chemistry]

23-Jun-2015 | Hannah L. Stern; Andrew J. Musser; Simon Gelinas; Patrick Parkinson; Laura M. Herz; Matthew J. Bruzek; John Anthony; ..., Proceedings of the National Academy of Sciences current issue, 2015

Singlet exciton fission is the spin-conserving transformation of one spin-singlet exciton into two spin-triplet excitons. This exciton multiplication mechanism offers an attractive route to solar cells that circumvent the single-junction Shockley–Queisser limit. Most theoretical descriptions of ...

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Solution structure of the PsIAA4 oligomerization domain reveals interaction modes for transcription factors in early auxin response [Plant Biology]

12-May-2015 | Dhurvas Chandrasekaran Dinesh; Michael Kovermann; Mohanraj Gopalswamy; Antje Hellmuth; Luz Irina A. Calderón Villalo ..., Proceedings of the National Academy of Sciences current issue, 2015

The plant hormone auxin activates primary response genes by facilitating proteolytic removal of AUXIN/INDOLE-3-ACETIC ACID (AUX/IAA)-inducible repressors, which directly bind to transcriptional AUXIN RESPONSE FACTORS (ARF). Most AUX/IAA and ARF proteins share highly conserved C-termini mediating ...

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Joint neutron crystallographic and NMR solution studies of Tyr residue ionization and hydrogen bonding: Implications for enzyme-mediated proton transfer [Biochemistry]

05-May-2015 | Ryszard Michalczyk; Clifford J. Unkefer; John-Paul Bacik; Tobias E. Schrader; Andreas Ostermann; Andrey Y. Kovalevsk ..., Proceedings of the National Academy of Sciences current issue, 2015

Human carbonic anhydrase II (HCA II) uses a Zn-bound OH−/H2O mechanism to catalyze the reversible hydration of CO2. This catalysis also involves a separate proton transfer step, mediated by an ordered solvent network coordinated by hydrophilic residues. One of these residues, Tyr7, was previously ...

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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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Reply to Proenca et al.: Sown biodiverse pastures are not a universal solution to invasion risk [Biological Sciences]

07-Apr-2015 | Don A. Driscoll; Jane A. Catford; Jacob N. Barney; Philip E. Hulme; Inderjit; Tara G. Martin; Aníbal Pauchard; Petr ..., Proceedings of the National Academy of Sciences current issue, 2015

Proença et al. (1) highlight that sown biodiverse pastures (SBP) can provide local solutions that increase production while limiting the risk of new pasture taxa invading natural areas. We agree that in Portugal SBP is an innovative approach for reducing the weed risk. However, SBP does not offer ...

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Dysfunctional conformational dynamics of protein kinase A induced by a lethal mutant of phospholamban hinder phosphorylation [Biophysics and Computational Biology]

24-Mar-2015 | Jonggul Kim; Larry R. Masterson; Alessandro Cembran; Raffaello Verardi; Lei Shi; Jiali Gao; Susan S. Taylor; Gianlui ..., Proceedings of the National Academy of Sciences current issue, 2015

The dynamic interplay between kinases and substrates is crucial for the formation of catalytically committed complexes that enable phosphoryl transfer. However, a clear understanding on how substrates modulate kinase structural dynamics to control catalytic efficiency is still missing. Here, we ...

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Comprehensive analysis of heterotrimeric G-protein complex diversity and their interactions with GPCRs in solution [Biochemistry]

17-Mar-2015 | Matthias Hillenbrand; Christian Schori; Jendrik Schöppe; Andreas Plückthun, Proceedings of the National Academy of Sciences current issue, 2015

Agonist binding to G-protein–coupled receptors (GPCRs) triggers signal transduction cascades involving heterotrimeric G proteins as key players. A major obstacle for drug design is the limited knowledge of conformational changes upon agonist binding, the details of interaction with the different ...

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Nucleation of metastable aragonite CaCO3 in seawater [Applied Physical Sciences]

17-Mar-2015 | Wenhao Sun; Saivenkataraman Jayaraman; Wei Chen; Kristin A. Persson; Gerbrand Ceder, Proceedings of the National Academy of Sciences current issue, 2015

Predicting the conditions in which a compound adopts a metastable structure when it crystallizes out of solution is an unsolved and fundamental problem in materials synthesis, and one which, if understood and harnessed, could enable the rational design of synthesis pathways toward or away from ...

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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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