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Interfacing Microwells with Nanoliter Compartments: A Sampler Generating High-Resolution Concentration Gradients for Quantitative Biochemical Analyses in Droplets

12-Dec-2014 | Fabrice Gielen; Tomas Buryska; Liisa Van Vliet; Maren Butz; Jiri Damborsky; Zbynek Prokop; Florian Hollfelder, Analytical Chemistry, 2014

Analysis of concentration dependencies is key to the quantitative understanding of biological and chemical systems. In experimental tests involving concentration gradients such as inhibitor library screening, the number of data points and the ratio between the stock volume and the volume required ...

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Determination of Total Protein Concentration in Solution Using Gold Electrode Modified with Silver Nanoparticles

11-Dec-2014 | Patrick Marcel Seumo Tchekwagep , Charles Péguy Nanseu‐Njiki, Emmanuel Ngameni, Ravi Danielsson, Thomas Arnebrant, T ..., Electroanalysis, 2014

Abstract Gold electrodes were modified with silver nanoparticles and Ag/AgCl redox conversion was recorded by cyclic voltammetry in protein containing electrolyte solution. The charge of the reduction peak decreased with the increase of the total protein concentration. This correlation was ...

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Regioselective Synthesis of 1,3‐ and 1,2‐Tocopheryl Glyceride Ethers of Carboxylic Acids

11-Dec-2014 | Bo Seul Choi, Jeongae Choi, Seonyoung Bak, Sangho Koo, European Journal of Organic Chemistry, 2014

Abstract A regioselective synthetic method with which to access 1,3‐tocopheryl glyceride ethers 2 of diverse carboxylic acids was developed through Bu4NBr‐catalyzed ring‐opening of tocopheryl glycidyl ether 1. Steglich esterification of the 1,3‐tocopheryl acetyl‐glyceride ether 2a with various ...

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Are thermodynamic cycles necessary for continuum solvent calculation of pKas and reduction potentials?

09-Dec-2014 | Junming Ho, Physical Chemistry Chemical Physics, 2014

Continuum solvent calculations of pKas and reduction potentials usually entail the use of a thermodynamic cycle to express the reaction free energy in terms of gas phase energies and free energies of solvation. In this work, we present a systematic study comparing the solution phase free energy ...

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Synthesis of active tin: an efficient reagent for allylation reaction of carbonyl compounds

09-Dec-2014 | Arun Kumar Sinha; Amit Sil; Anup Kumar Sasmal; Mukul Pradhan; Tarasankar Pal, New Journal of Chemistry, 2014

High purity Sn(0) has been obtained as a result of reduction of SnO by sodium stannite (Na2SnO2) in aqueous solution. The process stands unique for the production of tin metal. The as-synthesized tin finds applications in synthetic organic chemistry as a reagent for the allylation of aldehydes ...

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Alkaline‐Earth (Mg–Ba) Coordination Networks Built Around the Tris(dipicolinato)cerate(3–) Ion: Highly Hydrated Networks That Survive Dehydration

05-Dec-2014 | S. M. Elahi, M. V. Rajasekharan, European Journal of Inorganic Chemistry, 2014

Abstract Alkaline‐earth (AE)/cerium(III)‐based heterometallic coordination compounds of the biologically important ligand dipicolinic acid (dipicH2), namely [Mg(H2O)6]2[Ce(dipic)3][Ce(dipic)2(H2O)3]·2H2O (1), [Ca3(H2O)12Ce2(dipic)6]·6H2O (2), [Sr3(H2O)16Ce2(dipic)6]·4H2O (3) and ...

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Synthesis of active tin: an efficient reagent for allylation reaction of carbonyl compounds

02-Dec-2014 | T Pal; Arun Kumar Sinha; Amit Sil; Anup Kumar Sasmal; Mukul Pradhan, New Journal of Chemistry, 2014

High purity Sn(0) has been obtained as a result of reduction of SnO by sodium stannite (Na2SnO2) in aqueous solution. The process stands unique for the production of tin metal. The as-synthesized tin finds application in synthetic organic chemistry as a reagent for the allylation of aldehydes and ...

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Proton-Coupled Electron Transfer in Tyrosine and a β-Hairpin Maquette: Reaction Dynamics on the Picosecond Time Scale

01-Dec-2014 | Cynthia V. Pagba; San-Hui Chi; Joseph Perry; Bridgette A. Barry, Journal of Physical Chemistry B, 2014

In proteins, proton-coupled electron transfer (PCET) can involve the transient oxidation and reduction of the aromatic amino acid tyrosine. Due to the short life time of tyrosyl radical intermediates, transient absorption spectroscopy provides an important tool in deciphering electron-transfer ...

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Reduction of Diffusive Contaminant Emissions from a Dissolved Source in a Lower Permeability Layer by Sodium Persulfate Treatment

26-Nov-2014 | Bridget A. Cavanagh; Paul C. Johnson; Eric J. Daniels, Environmental Science & Technology, 2014

Residual contamination contained in lower permeability zones is difficult to remediate and can, through diffusive emissions to adjacent higher permeability zones, result in long-term impacts to groundwater. This work investigated the effectiveness of oxidant delivery for reducing diffusive ...

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Facile and Room-Temperature Activation of Csp3–Cl Bonds by Cheap and Air-Stable Nickel(II) Complexes of (N-Thioether) DPPA-Type Ligands

26-Nov-2014 | Alessio Ghisolfi; Francesca Condello; Christophe Fliedel; Vitor Rosa; Pierre Braunstein, Organometallics, 2014

Reaction of the diphosphine (P,P) ligand N(PPh2)2(n-PrSMe) (1) or N(PPh2)2(p-(SMe)C6H4) (2) with [Ni(NCMe)6][BF4]2 in a 2:1 molar ratio afforded the bis-chelated, dicationic Ni(II) complexes [Ni(1)2][BF4]2 (3) and [Ni(2)2][BF4]2 (4), respectively. Both complexes were characterized in solution by ...

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