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https://www.readbyqxmd.com/read/28922576/anion-exchange-membranes-for-alkaline-fuel-cell-applications-the-effects-of-cations
#1
Zhe Sun, Bencai Lin, Feng Yan
Alkaline anion exchange membrane fuel cells (AEMFCs) are attracting great attention, because of their potential use of non-precious electrocatalysts. Anion exchange membrane (AEM) is one of the key components of AEMFCs. An ideal AEM should possess high hydroxide conductivity and sufficient long-term durability at elevated temperatures in high pH solutions. This review provides recent progresses of alkaline stability behavior of cations (including quaternary ammonium, imidazolium, guanidinium, pyridinium, tertiary sulfonium, phosphonium, benzimidazolium and pyrrolidinium) and their analogous AEMs, which have been investigated by both experimental studies and theoretical calculations...
September 18, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28922529/borane-stabilized-isomeric-dimers-of-the-phosphaethynolate-anion
#2
Kevin Szkop, Andrew Jupp, Riccardo Suter, Hansjorg Gruetzmacher, Douglas Wade Stephan
The reactions of the phosphaethynolate anion ([PCO]-) with a range of boranes were explored. BPh3 and [PCO]- form a dimeric anion featuring P-B bonds and is prone to dissociation at room temperature. The more Lewis acidic borane B(C6F5)3 yields a less symmetric dimer of [PCO]- with P-B and P-O bonds. Less sterically demanding HB(C6F5)2 and H2B(C6F5) boranes form a third isomer with [PCO]- with both boranes bound to the same phosphorus atom. Despite the unexpected thermodynamic preference for P-coordination, computational data illustrate that electronic and steric features impact the binding modes of the resulting dianionic dimers...
September 18, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28922472/mirna-506-promotes-primary-biliary-cholangitis-like-features-in-cholangiocytes-and-immune-activation
#3
Oihane Erice, Patricia Munoz-Garrido, Javier Vaquero, Maria J Perugorria, Maite G Fernandez-Barrena, Elena Saez, Alvaro Santos-Laso, Ander Arbelaiz, Raul Jimenez-Agüero, Joaquin Fernandez-Irigoyen, Enrique Santamaria, Verónica Torrano, Arkaitz Carracedo, Meenakshisundaram Ananthanarayanan, Marco Marzioni, Jesus Prieto, Ulrich Beuers, Ronald P Oude Elferink, Nicholas F LaRusso, Luis Bujanda, Jose J G Marin, Jesus M Banales
Primary biliary cholangitis (PBC) is a chronic cholestatic liver disease associated with autoimmune phenomena targeting intrahepatic bile duct cells (cholangiocytes). Although PBC etiopathogenesis still remains obscure, development of anti-mitochondrial auto-antibodies against pyruvate dehydrogenase complex-E2 (PDC-E2) is a common feature. MicroRNA (miR) dysregulation occurs in liver and immune cells of PBC patients, but their functional relevance is largely unknown. We previously reported that miR-506 is overexpressed in PBC cholangiocytes and directly targets both Cl(-) /HCO3(-) anion exchanger 2 (AE2) and type III inositol 1,4,5-trisphosphate receptor (InsP3R3), leading to cholestasis...
September 18, 2017: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/28922469/one-pot-synthesis-of-gdp-mannose-by-a-multi-enzyme-cascade-for-enzymatic-assembly-of-lipid-linked-oligosaccharides
#4
Thomas F T Rexer, Anna Schildbach, Jan Klapproth, Angelika Schierhorn, Reza Mahour, Markus Pietzsch, Erdmann Rapp, Udo Reichl
Glycosylation of proteins is a key function of the biosynthetic-secretory pathway in the endoplasmic reticulum (ER) and Golgi apparatus. Glycosylated proteins play a crucial role in cell trafficking and signaling, cell-cell adhesion, blood-group antigenicity, and immune response. In addition, the glycosylation of proteins is an important parameter in the optimization of many glycoprotein-based drugs such as monoclonal antibodies. In vitro glycoengineering of proteins requires glycosyltransferases as well as expensive nucleotide sugars...
September 18, 2017: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/28921977/photoinduced-bimolecular-electron-transfer-in-ionic-liquids
#5
Boning Wu, Mark Maroncelli, Edward W Castner
The present work seeks to better understand the role of solute diffusion and solvation dynamics on bimolecular electron transfer in ionic liquids (ILs). Steady-state and time-resolved measurements of the reductive fluorescence quenching of five fluorophores ("F") by six quenchers ("Q"; electron donors) are reported in acetonitrile and two ionic liquids, 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide and trihexyl(tetradecyl)phosphonium bis(trifluoromethylsulfonyl)amide. Data were collected on 66 different F-Q-solvent systems, which span a 2...
September 18, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28921959/quantification-and-theoretical-analysis-of-the-electrophilicities-of-michael-acceptors
#6
Dominik S Allgäuer, Harish Jangra, Haruyasu Asahara, Zhen Li, Quan Chen, Hendrik Zipse, Armin R Ofial, Herbert Mayr
In order to quantify the electrophilic reactivities of common Michael acceptors, we measured the kinetics of the reactions of monoacceptor-substituted ethylenes (H2C═CH-Acc, 1) and styrenes (PhCH═CH-Acc, 2) with pyridinium ylides 3, sulfonium ylide 4, and sulfonyl-substituted chloromethyl anion 5. Substitution of the 57 measured second-order rate constants (log k) and the previously reported nucleophile-specific parameters N and sN for 3-5 into the correlation log k = sN(E + N) allowed us to calculate 15 new empirical electrophilicity parameters E for Michael acceptors 1 and 2...
September 18, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28921897/a-combined-experimental-and-theoretical-approaches-to-correlate-the-structure-and-properties-of-n-methylpyrrolidone-based-protic-ionic-liquids
#7
Somenath Panda, Kaushik Kundu, Siva Umapathy, Ramesh Gardas
Correlation of the structure and properties of ionic liquids (ILs) is essential for the development of optimized materials in the fields of gas capture and separation, battery electrolyte, and cellulose dissolution process. In view of this, a detailed vibrational spectroscopic analysis and quantum-chemical calculation were performed to explore the interionic interactions in N-methylpyrrolidone cation and carboxylate anion-based ILs. FTIR and Raman spectroscopy were applied to identify the H-bonding interactions between ion-pair, in which red-shifted vibrational modes were evidenced as a function of anion chain length...
September 17, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28921493/vibration-ball-milling-for-the-synthesis-of-5-thioadenosine-5-pyrophosphate-p-%C3%A2-5-adenosine-dasppa
#8
Olga Eguaogie, Joseph S Vyle
Using vibration ball milling, 5'-chloro-5'-deoxyadenosine (CldA) reacts cleanly with 4-methoxybenzyl mercaptan (MobSH), under basic conditions, to the corresponding thioether (MobSdA), which is isolated following precipitation and trituration. Under acidic conditions, in a one-pot, two-step process, MobSdA is transformed into 5'-deoxy-5'-(5-nitropyridyl-2-disulfanyl)-adenosine (NPySSdA). Michaelis-Arbuzov (M-A) reaction of NPySSdA with tris(trimethylsilyl) phosphite proceeds to completion within 30 min as determined by (31) P NMR, and the persilylated M-A product thus formed can be stored in solution under anhydrous conditions at room temperature for several days (in contrast, the anionic phosphorothiolate monoester is labile to hydrolysis)...
September 18, 2017: Current Protocols in Nucleic Acid Chemistry
https://www.readbyqxmd.com/read/28921397/a-binding-block-ion-selective-mechanism-revealed-by-a-na-k-selective-channel
#9
Jie Yu, Bing Zhang, Yixiao Zhang, Cong-Qiao Xu, Wei Zhuo, Jingpeng Ge, Jun Li, Ning Gao, Yang Li, Maojun Yang
Mechanosensitive (MS) channels are extensively studied membrane protein for maintaining intracellular homeostasis through translocating solutes and ions across the membrane, but its mechanisms of channel gating and ion selectivity are largely unknown. Here, we identified the YnaI channel as the Na(+)/K(+) cation-selective MS channel and solved its structure at 3.8 Å by cryo-EM single-particle method. YnaI exhibits low conductance among the family of MS channels in E. coli, and shares a similar overall heptamer structure fold with previously studied MscS channels...
September 18, 2017: Protein & Cell
https://www.readbyqxmd.com/read/28921162/a-bionanohybrid-znal-nads-ecological-pesticide-as-a-treatment-for-soft-rot-disease-in-potato-solanum-tuberosum-l
#10
Erika Elizabeth Morales-Irigoyen, Yolanda de Las Mercedes Gómez-Y-Gómez, Jorge Luis Flores-Moreno, Marina Olivia Franco-Hernández
Pectobacterium carotovorum (Pc) is a phytopathogenic strain that causes soft rot disease in potato (Solanum tuberosum L.), resulting in postharvest losses. Chemical control is effective for managing this disease, but overdoses cause adverse effects. Because farmers insist on using chemical agents for crop protection, it is necessary to develop more effective pesticides in which the active compound released can be regulated. In this context, we proposed the synthesis of ZnAl-NADS, in which nalidixic acid sodium salt (NADS) is linked to a ZnAl-NO3 layered double hydroxide (LDH) host as a nanocarrier...
September 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28920993/cobalt-ii-containing-liquid-metal-salts-for-electrodeposition-of-cobalt-and-electrochemical-nanoparticle-formation
#11
Jeroen Sniekers, Pieter Geysens, João C Malaquías, Tom Vander Hoogerstraete, Luc Van Meervelt, Jan Fransaer, Koen Binnemans
Cobalt(ii)-containing liquid metal salts (LMS) with N-alkylimidazole ligands and bis(trifluoromethanesulfonyl)imide (bistriflimide, Tf2N(-)) or methanesulfonate (mesylate, OMs(-)) anions were synthesized and characterized. The chain length of the alkyl side chain on the imidazole ligand was varied. All compounds were characterized using CHN analysis, DSC and FTIR measurements. Single-crystal X-ray diffraction measurements were performed on six of the compounds for which single crystals of good quality could be obtained...
September 18, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28920769/modacrylic-anion-exchange-fibers-for-cr-vi-removal-from-chromium-plating-rinse-water-in-batch-and-flow-through-column-experiments
#12
Seung-Chan Lee, Jin-Kyu Kang, Eun-Hye Sim, Nag-Choul Choi, Song-Bae Kim
The aim of this study was to investigate Cr(VI) removal from chromium-plating rinse water using modacrylic anion-exchange fibers (KaracaronTM KC31). Batch experiments were performed with synthetic Cr(VI) solutions to characterize the KC31 fibers in Cr(VI) removal. Cr(VI) removal by the fibers was affected by solution pH; the Cr(VI) removal capacity was the highest at pH 2 and decreased gradually with a pH increase from 2 to 12. In regeneration and reuse experiments, the Cr(VI) removal capacity remained above 37...
September 18, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/28920713/estradiol-decreases-blood-pressure-in-association-with-redox-regulation-in-preeclampsia
#13
Goran M Babic, Snezana D Markovic, Mirjana Varjacic, Natasa Z Djordjevic, Tamara Nikolic, Isidora Stojic, Vladimir Jakovljevic
In this study, we tested a hypothesis that a short-term estradiol therapy may reduce blood pressure in preeclampsia by modulating plasma oxidative stress. The intramuscular injections of 10 mg 17-beta-estradiol were prescribed to preeclamptic pregnant women during the 3-day therapy before a labor induction. The analyses of mean arterial pressure (MAP), serum estradiol concentrations, plasma superoxide anion (O2.), hydrogen peroxide (H2O2), nitrites (NO2(-)), and peroxynitrite (ONOO(-)) were conducted before and during the therapy...
September 18, 2017: Clinical and Experimental Hypertension: CHE
https://www.readbyqxmd.com/read/28920630/experimental-and-ab-initio-studies-of-cd5-bo3-3cl-the-first-cadmium-borate-chlorine-nlo-material-with-isolated-bo3-groups
#14
Yunxia Song, Min Luo, Fei Liang, Chensheng Lin, Ning Ye, Guiyang Yan, Zheshuai Lin
A nonlinear optical crystal cadmium borate chlorine (Cd5(BO3)3Cl) has been successfully grown through a spontaneous crystallization method. Cd5(BO3)3Cl crystallizes in the noncentrosymmetric space group Cm with isolated BO3 and distorted CdOnClm (n = 4, 5, 7; m = 0, 1, 2) polyhedra. Powder second harmonic generation (SHG) measurements on polycrystalline Cd5(BO3)3Cl indicated that the title compound is phase-matchable in the visible region and exhibits a large SHG response of about 5 × KH2PO4 (KDP). Further optical characterization suggested that the compound has a wide transparent region ranging from UV to near IR with a UV cutoff edge at about 295 nm...
September 18, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28920613/sulfonato-imino-copper-ii-complexes-fast-and-general-chan-evans-lam-coupling-of-amines-and-anilines
#15
V Hardouin Duparc, F Schaper
Sulfonato-imine copper complexes with either chloride or triflate counteranions were prepared in a one-step reaction followed by anion-exchange. They are highly active in Chan-Evans-Lam couplings under mild conditions with a variety of amines or anilines, in particular with sterically hindered substrates. No optimization of reaction conditions other than time and/or temperature is required.
September 18, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28920607/tuning-the-electronic-environment-of-zinc-ions-with-a-ligand-for-dendrite-free-zinc-deposition-in-an-ionic-liquid
#16
Zhen Liu, Guozhu Li, Tong Cui, Abhishek Lahiri, Andriy Borodin, Frank Endres
In this work, we report on the influence of an organic ligand on the electrodeposition of Zn from an ionic liquid (IL) electrolyte. Zinc oxide was first dissolved in a protic IL. By introducing a 2-methylimidazole (2-MIm) ligand, the electronic environment of zinc ions, Zn(ii) complexes and the structure of the IL are considerably altered, as verified by both X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. Due to the electron donation effect of the ligand, the zinc ions become less positively charged and exhibit a lower binding energy by -0...
September 18, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28920594/terminal-tungsten-pnictide-complex-formation-through-pnictaethynolate-decarbonylation
#17
Maximilian Joost, Wesley J Transue, Christopher C Cummins
Tungsten(iv) tetrakis(2,6-diisopropylphenoxide) (1) has been demonstrated to be a competent platform for decarbonylative formation of anionic terminal pnictide complexes upon treatment with pnictaethynolate anions: cyanate, 2-phosphaethynolate, and 2-arsaethynolate. These transformations constitute the first examples of terminal phosphide and arsenide complex formation at a transition metal center from OCP(-) and OCAs(-), respectively. The phosphide and arsenide complexes are also the first to be isolated in a tetragonal, all-oxygen ligand environment...
September 18, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28920423/self-organization-of-ions-at-the-interface-between-graphene-and-ionic-liquid-deme-tfsi
#18
Guangliang Hu, Gaind P Pandey, Qingfeng Liu, Radhika S Anaredy, Chunrui Ma, Ming Liu, Jun Li, Scott K Shaw, Judy Z Wu
Electrochemical effects manifest as nonlinear responses to an applied electric field in electrochemical devices, and are linked intimately to the molecular orientation of ions in the electric double layer (EDL). Herein, we probe the origin of the electrochemical effect using a double-gate graphene field effect transistor (GFET) of ionic liquid N,N-diethyl-N-(2-methoxyethyl)-N-methylammonium bis-(trifluoromethylsulfonyl)-imide (DEME-TFSI) top-gate, paired with a ferroelectric Pb0.92La0.08Zr0.52Ti0.48O3 (PLZT) back-gate of compatible gating efficiency...
September 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28920151/removal-of-arsenic-iii-and-v-from-laboratory-solutions-and-contaminated-groundwater-by-metallurgical-slag-through-anion-induced-precipitation
#19
Rafael Schouwenaars, Claudia Victoria Montoya-Bautista, Elizabeth Diane Isaacs-Páez, Myriam Solís-López, Rosa María Ramírez-Zamora
Metallurgical slag was used for the simultaneous removal of high concentrations of arsenite and arsenate from laboratory solutions and severely contaminated groundwater. Apart from demonstrating the high efficiency of arsenic removal in presence of competing species, the work aims to explore the physicochemical mechanisms of the process by means of microscopy observation and a detailed statistical analysis of existing kinetic and isotherm equations. Fitting was performed by non-linear least squares using weighted residuals; ANOVA and bootstrap methods were used to compare the models...
September 17, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28918628/breaking-benzene-aromaticity-computational-insights-into-the-mechanism-of-the-tungsten-containing-benzoyl-coa-reductase
#20
Martin Culka, Simona G Huwiler, Matthias Boll, G Matthias Ullmann
Aromatic compounds are environmental pollutants with toxic and carcinogenic properties. Despite the stability of aromatic rings, bacteria are able to degrade the aromatic compounds into simple metabolites and use them as growth substrates under oxic or even under anoxic conditions. In anaerobic microorganisms, most monocyclic aromatic growth substrates are converted to the central intermediate benzoyl-coenzyme A, which is enzymatically reduced to cyclohexa-1,5-dienoyl-CoA. The strcitly anaerobic bacterium \textit{Geobacter metallireducens} uses the class II benzoyl-CoA reductase complex for this reaction...
September 18, 2017: Journal of the American Chemical Society
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