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Anions (23):
Recent article
Anions
Organic Letters (13)9 2011
Abstract
A dual-catalysis approach enables the small-molecule catalyzed kinetic resolution of allylic amines by acylation. By employing 2 mol % of each 4-(pyrrolidino)pyridine (PPY) and a readily available chiral hydrogen-bonding cocatalyst, the first nonenzymatic kinetic resolution of allyli...
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PMID: 21476518
PDF is available here.
PDF is available here.
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Abstract
Acetoxy Meldrum's acid can serve as a versatile acyl anion equivalent in the Pd-catalyzed asymmetric allylic alkylation. The reaction of this nucleophile with various meso and racemic electrophiles afforded alkylated products in high yields and enantiopurities. These enantioenriched...
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PMID: 21615099
PDF is available here.
PDF is available here.
Abstract
Disproportionation of dipyrrolylquinoxaline radical anions occurs via hydrogen atom transfer from the pyrrole moiety to the quinoxaline moiety to produce monodeprotonated dipyrrolylquinoxaline anions and monohydrodipyrrolylquinoxaline anions. In contrast, simple quinoxaline radical anions without pyr...
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PMID: 21510700
PDF is available here.
PDF is available here.
Organic Letters (13)7 2011
Abstract
The (hetero)aromatic trifluoromethyl group is present in many biologically active molecules and is generally considered to be chemically stable. In this paper, a convenient one-step synthesis of C-C linked aryl-heterocycles or heteroaryl-heterocycles in good to excellent yields via t...
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PMID: 21381681
PDF is available here.
PDF is available here.
Abstract
We recently showed that defective membrane expression of NBCe1, caused by several mutations such as Delta65bp (S982NfsX4), is also associated with familial migraine. The Delta65bp mutant is quite unique in that it lacks a putative carbonic anhydrase (CA) II-binding domain but still shows an apparent...
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PMID: 21224720
PDF is available here.
PDF is available here.
Abstract
We have investigated the uptake of anionic polystyrene (PS) nanoparticles of ∼100 nm diameter by mesenchymal stem cells (MSCs) using spinning-disk confocal optical microscopy combined with a quantitative analysis of the fluorescence images. Two types of anionic PS nanoparticles with essentially id...
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PMID: 21409242
PDF is available here.
PDF is available here.
Chemical Communications (46)42 2010
Abstract
Presence of strongly binding anion, F(-) stabilizes the photo-induced charge-separated states of a bis-fullerene-substituted oxoporphyrinogen due to the large shift in the oxidation potential of the oxoporphyrinogen moiety upon anion binding through hydrogen bonding at its core.
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PMID: 20862426
PDF is available here.
PDF is available here.
Abstract
We anticipate that WAX/WCX microcolumns are promising for the integration of protein separation and tryptic digestion aiming at high-throughput proteome study....
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PMID: 20886523
PDF is available here.
PDF is available here.
Abstract
The hexaazamacrocycles [28](DBF)(2)N(6) {cyclo[bis(4,6-dimethyldibenzo[b,d]furaniminoethyleneiminoethylene]} and [32](DBF)(2)N(6) {cyclo[bis(4,6-dimethyldibenzo[b,d]furaniminopropyleneiminopropylene]} form stable dinuclear copper(ii) complexes suitable to behave as receptors for several anionic subs...
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PMID: 20820604
PDF is available here.
PDF is available here.
Abstract
An efficient synthesis of the N-methylwelwistatin tetracyclic core in only two steps from Kornfeld's ketone is described, whose key transformation involves the generation of a fused bicyclo[4.3.1]decane ring system through a one-pot sequence comprising a Michael-intramolecular aldolization anionic d...
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PMID: 20717611
PDF is available here.
PDF is available here.
Chemical Communications (46)38 2010
Abstract
We report the use of commercially available anionic N,O-ligands to produce highly active catalysts....
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PMID: 20820503
PDF is available here.
PDF is available here.
Abstract
The anion binding properties of two title tri(indolyl)methane compounds have been evaluated by using UV-vis absorption and fluorescence spectroscopy. Different from 3-linked receptor which exhibited faint even no obvious spectral response to anions, 2-linked receptor can bind F(-), AcO(-) and H(2)PO...
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PMID: 20643574
PDF is available here.
PDF is available here.
Journal of Biological Chemistry (285)42 2010
Abstract
We studied a range of synthetic peptides: specifically those equating to the N1 (residues 23-110) and N2 (23-89) fragments derived from constitutive processing of PrP(C) and including those representing arbitrarily defined component domains of the N terminus of mouse prion protein. Utilizing more ph...
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PMID: 20679345
PDF is available here.
PDF is available here.
Abstract
The interaction between anionic form of meso-tetrakis(4-carboxyphenyl) porphyrin (TCPP) and calf thymus deoxyribonucleic acid (CT DNA) is investigated by measuring UV-vis absorption, steady-state fluorescence, steady-state fluorescence anisotropy, time-resolved fluorescence, resonance light scatteri...
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PMID: 20655240
PDF is available here.
PDF is available here.
Bioresource Technology (101)19 2010
Abstract
In this paper the Mannich reaction product of dimethylamine, acetone and formaldehyde was grafted onto hydroxymethylated lignin to form a lignin-base cationic polyelectrolyte (L-DAF). L-DAF samples with different cationic strengths and molecular weights were synthesized and character...
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PMID: 20576562
PDF is available here.
PDF is available here.
Abstract
Two oxime-based colorimetric probes for the hypochlorite anion (ClO(-)) have been rationally designed and synthesized on basis of the mechanism of intramolecular charge transfer (ICT). Upon addition of ClO(-), the probes displayed around 20nm redshift in the absorption maximum, accompanied with the...
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PMID: 20591725
PDF is available here.
PDF is available here.
Abstract
A new high-sensitivity detection of protein assay at the nanogram level is proposed based on multi-spectroscopic methods including resonance light scattering (RLS), atomic force microscopy (AFM), ultraviolet spectra (UV) and fluorescence spectra etc. Under the optimum conditions, the amplified RLS s...
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PMID: 20638325
PDF is available here.
PDF is available here.
Journal of Physical Chemistry A: Molecules, Spectroscopy, Kinetics, Environment and General Theory (114)37 2010
Abstract
The proline cation based amino acid ionic liquid [Pro]+[NO3]− was systematically studied by density functional theory at the B3LYP/6-311++G** level. The stable geometries of the cation, anion, ion pair, as well as the ion-pair dimer [Pro]2+[NO3]2− with no imaginary frequencies were obtained and...
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PMID: 20735121
PDF is available here.
PDF is available here.
Chemical Communications (46)32 2010
Abstract
An accurate rationalization of the interplay between H-bonding and both anion-pi and lone-pair-pi interactions present in specific host-guest complexes, has been performed by using first principle computations. Results show that their combination leads to a cooperativity effect.
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PMID: 20617263
PDF is available here.
PDF is available here.
Chemical Communications (46)31 2010
Abstract
Anionic phthalocyanines inhibited efficiently telomerase activity even in the presence of excess double-stranded DNA (dsDNA) because of their selective binding to telomere G-quadruplex, although low selectivity of a typical cationic ligand, TMPyP4, to the G-quadruplex allowed telomerase reaction und...
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PMID: 20596577
PDF is available here.
PDF is available here.
Acta Biomaterialia (6)8 2010
Abstract
Phosphate-based glasses (PGs) and their composites are of interest as bone repair and tissue engineering scaffolds due to the totally degradable nature of the materials. This study has investigated the effect of Si and Fe on the properties of PG particulate-filled polycaprolactone (P...
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PMID: 20206722
PDF is available here.
PDF is available here.
Acta Biomaterialia (6)8 2010
Abstract
Phosphate-based glasses (PGs) and their composites are of interest as bone repair and tissue engineering scaffolds due to the totally degradable nature of the materials. This study has investigated the effect of Si and Fe on the properties of PG particulate-filled polycaprolactone (P...
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PMID: 20206722
PDF is available here.
PDF is available here.
Biochimica et Biophysica Acta (1798)9 2010
Abstract
We now show that reduced permeability of one does not protect the intracellular parasite from the other. Leupeptin accumulation in the blasticidin S-resistant mutant was relatively preserved, consistent with retained in vitro susceptibility to leupeptin. Subsequent in vitro selection with both toxin...
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PMID: 20451492
PDF is available here.
PDF is available here.
Abstract
Ion chromatography has been proposed for the determination of three common inorganic anions (chloride, nitrate, and sulfate) in nine weak acids (tartaric acid, citric acid, formic acid, acetic acid, metacetonic acid, butyric acid, butanedioic acid, hexafluorophosphoric acid, and salicylic acid) usin...
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PMID: 20819280
PDF is available here.
PDF is available here.
Abstract
Ruthenium complexes containing 4,7-diphenyl-1,10-phenanthroline disulfonate (bathophenanthroline disulfonate; BPS) ligands, Ru(BPS)(3)(4-), Ru(BPS)(2)(bipy)(2-) and Ru(BPS)(bipy)(2), were compared to tris(2,2'-bipyridine)ruthenium(II) (Ru(bipy)(3)(2+)), including examination of the wavelengths of ma...
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PMID: 20602982
PDF is available here.
PDF is available here.
Nature Chemistry (2)7 2010
Abstract
Nature Chemistry (2)7 2010
Abstract
We prepared a collection of monomeric, cyclic and rod-shaped naphthalenediimide transporters. Their ability to exert anion-pi interactions was demonstrated by electrospray tandem mass spectrometry in combination with theoretical calculations. To relate this structural evidence to transport activity...
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PMID: 20571570
PDF is available here.
PDF is available here.
Abstract
We were interested in the involvement of the HCO(3)(-)/Cl(-) anion exchanger to transepithelial ion transport processes. Basolateral application of DIDS, an inhibitor of the AE, resulted in a significantly decreased the short-circuit current (I(SC)). The effect of DIDS was diminished by acetazolamid...
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PMID: 20410470
PDF is available here.
PDF is available here.
Abstract
These results provide parametric data for comparison with fluid secretion from glands in ferrets lacking CFTR....
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PMID: 20435689
PDF is available here.
PDF is available here.
Abstract
The effects of addition of F(-), Cl(-), Br(-), I(-), NO(3)(-), H(2)PO(4)(-), and OAc(-) on the UV-vis and emission spectra of Ru(II) complex [Ru(bpy)(2)(H(2)iip)](ClO(4))(2) {bpy=2,2'-bipyridyl, H(2)iip=2-indole-3-yl-imidazole[4,5-f][1,10]-phenanthroline} in dimethyl sulfone were studied. The Ru(II)...
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PMID: 20378395
PDF is available here.
PDF is available here.
Abstract
The human apical sodium-dependent bile acid transporter (hASBT) may serve as a prodrug target for oral drug absorption. Synthetic, biological, NMR, and computational approaches identified the structure-activity relationships of mono- and dianionic bile acid conjugates for hASBT binding. Experimental...
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PMID: 20504026
PDF is available here.
PDF is available here.
Journal of Cell Biology (189)7 2010
Abstract
We devised means of reversibly and separately permeabilizing the plasma and lysosomal membranes to dialyze the cytosol and lysosome lumen in intact cells, while ratiometrically monitoring lysosomal pH. Replacement of cytosolic Cl(-) with impermeant anions did not significantly alter proton pumping,...
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PMID: 20566682
PDF is available here.
PDF is available here.
Abstract
Microbial reduction of Fe(III) oxides results in the production of Fe(II) and may lead to the subsequent formation of Fe(II)-bearing secondary mineralization products including magnetite, siderite, vivianite, chukanovite (ferrous hydroxy carbonate (FHC)), and green rust; however, the factors control...
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PMID: 20476735
PDF is available here.
PDF is available here.
Journal of Hazardous Materials (178)1-3 2010
Abstract
In this work, the extraction of Congo red (CR), an anionic disazo direct dye, from aqueous solutions by emulsion liquid membrane (ELM) was investigated. The important operational parameters governing emulsion stability and extraction behavior of dye were studied. The extraction of CR was influenced...
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PMID: 20211520
PDF is available here.
PDF is available here.
Journal of Hazardous Materials (178)1-3 2010
Abstract
Alumina possesses an appreciable defluoridation capacity (DC) of 1566 mg F(-)/kg. In order to improve its DC, it is aimed to prepare alumina polymeric composites using the chitosan. Alumina/chitosan (AlCs) composite was prepared by incorporating alumina particles in the chitosan polymeric matrix, wh...
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PMID: 20144851
PDF is available here.
PDF is available here.
Chemical Communications (46)20 2010
Abstract
Two cyanide-bridged alternated 1 : 1 Ru(III)/Mn(III) complexes structurally characterized as single-chain containing co-crystallized bulk anions and cations have been successfully assembled from [Mn(TPP)(H(2)O)(2)](+) and [Ru(acac)(2)(CN)(2)](-) blocks. Systematic investigation of their magnetic pro...
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PMID: 20582355
PDF is available here.
PDF is available here.
Abstract
We therefore soaked selenate into two different types of RNA crystals and used the anomalous signal from these anions to identify binding sites in these RNA molecules unambiguously. Examination of these sites and comparison with other suspected anion binding sites reveals features of anion binding m...
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PMID: 20410239
PDF is available here.
PDF is available here.
Chemical Communications (46)18 2010
Abstract
New structural amphiphiles 2a and 2b bind the diphosphate lipid A anion and show potential as lead compounds for the development of novel antibacterial agents.
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PMID: 20424772
PDF is available here.
PDF is available here.
Biochemistry (Washington) (49)19 2010
Abstract
We have recently shown that three of the four residues comprising a loop in the N-lobe (Pro142, Lys144, and Pro145) are critical to the high-affinity interaction of hTF with the TFR. In contrast, Arg143 in this loop does not participate in the binding isotherm. In the current study, the kinetics of...
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PMID: 20397659
PDF is available here.
PDF is available here.
Abstract
A family of heterocyclic thiosemicarbazone dyes (1-9) linked to different furan, thiazole, (bi)thiophene, and arylthiophene pi-conjugated bridges were synthesized in good yields, and their response toward anions was studied. Acetonitrile solutions of 1-9 show bands in the 326-407 region that are mod...
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PMID: 20373768
PDF is available here.
PDF is available here.
Journal of Chromatography A (1217)19 2010
Abstract
Monitoring of trace impurities in electroplating bath is needed to meet EU requirements for WEEE and RoHS and for quality control of electrodeposits. Methods using IC and 100% aqueous CE buffer were found producing non-repeatable results attributed to interference of surfactants and major methanesul...
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PMID: 20117791
PDF is available here.
PDF is available here.
Abstract
Trypsin from the intestine of smooth hound (Mustelus mustelus) was purified by fractionation with ammonium sulfate, Sephadex G-75 gel filtration, and DEAE-cellulose ion exchange chromatography, with a 65-fold increase in specific activity and 15% recovery. The molecular weight of the purified trypsi...
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PMID: 20405833
PDF is available here.
PDF is available here.
Abstract
A novel method has been developed to detect two organic arsenic animal feed additives including roxarsone and p-arsanilic acid, as well as other arsenic species such as arsenite, dimethylarsinic acid, monomethylarsonic acid, arsenate, and 4-hydroxyphenylarsonic acid, by using high-performance liquid...
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PMID: 20373739
PDF is available here.
PDF is available here.
Abstract
We obtained the three-dimensional structure of OXA-46, which shows the overall fold of active serine beta-lactamases and a dimeric quaternary structure. Significant differences with currently available structures of class D beta-lactamases were found in the loops located close to the active site, wh...
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PMID: 20145076
PDF is available here.
PDF is available here.
Abstract
Iminoazophenol appended calix[4]arene/thiacalix[4]arene derivatives 1 and 2 of cone and 3 of 1,3-alternate conformation have been synthesized and examined for their chromogenic anion recognition abilities towards different anions like fluoride, chloride, bromide, iodide, acetate, dihydrogenphosphate...
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PMID: 20188879
PDF is available here.
PDF is available here.
Abstract
Phosphate was captured from aqueous solutions by cationic metal-EDA complexes anchored inside mesoporous silica MCM-41 supports (Cu(II)-EDA-SAMMS and Fe(III)-EDA-SAMMS). Fe-EDA-SAMMS was more effective at capturing phosphate than the Cu-EDA-SAMMS and was further studied for matrix effects (e.g., pH,...
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PMID: 20345133
PDF is available here.
PDF is available here.
Abstract
We present new developments of this technique. The number of analytes has been extended and we demonstrate the technique for depth profiling of analytes in both one and two dimensions. The physical dimensions of the cell in the laser ablation unit restrict the maximum length of gel that can be analy...
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PMID: 20383381
PDF is available here.
PDF is available here.
The Journal of Chemical Physics (132)14 2010
Abstract
We use mixed quantum/classical molecular dynamics with the two-electron Fourier-grid (2EFG) electronic structure method presented in the previous paper [W. J. Glover, R. E. Larsen, and B. J. Schwartz, J. Chem. Phys. 132, 144101 (2010)] to simulate the CTTS states of a sodium anion in liquid tetrahyd...
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PMID: 20405980
PDF is available here.
PDF is available here.
Abstract
Neutral starch microspheres (NSMs) were synthesized by an inverse microemulsion technology with epichlorohydrin as a crosslinker and soluble starch as starting material. Anionic starch microspheres (ASMs) were prepared from NSMs by the secondary polymerization with chloroacetic acid as the anionic e...
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PMID: 20428085
PDF is available here.
PDF is available here.
Chemical Communications (46)13 2010
Abstract
Cyclosteroidal "cholaphane" anion transporters show increased activities compared to acyclic "cholapod" analogues.
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PMID: 20234914
PDF is available here.
PDF is available here.
Abstract
The synthesis of a series of substituted phenanthridines by photostimulated C-C cyclization of anions from N-(ortho-halobenzyl)arylamines has been found to proceed in very good to excellent yields (79-95%) in liquid ammonia and in DMSO. The N-(ortho-halobenzyl)arylamines are obtained in good to very...
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PMID: 20210329
PDF is available here.
PDF is available here.
Abstract
We have examined the validity of this hypothesis for eight proton and eight hydride addition reactions of anions and cations, respectively, of annulenyl and benzannulenyl type. We categorize the (4n+2)pi-electron systems in S(0) and the 4npi-electron systems in T(1) to be of A-character and 4npi-ele...
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PMID: 20205444
PDF is available here.
PDF is available here.
Abstract
We investigated that the nature of the anion present in polysulfobetaines affects activity against certain microorganisms and their anti-microbial properties have been rationalized in terms of the structure-activity relationship. Vinyl imidazolium-based polysulfobetaines were prepared by the quatern...
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PMID: 20060120
PDF is available here.
PDF is available here.
Chemical Communications (46)12 2010
Abstract
(I(t)Pe)AuBr(2)(N-imidate) complexes, prepared in high yield by oxidative bromination, are active catalysts for 1,5-enyne cycloisomerization. An efficient tandem nucleophilic substitution-1,5-enyne cycloisomerization is promoted by these novel Au(III) precatalysts. Catalyst efficacy is affected by t...
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PMID: 20221487
PDF is available here.
PDF is available here.
Abstract
These results suggest that the addition of anionic polysaccharides to the continuous phase of oil-in-water emulsions could be used to increase the oxidative stability of oil-in-water emulsions and thus prolong shelf life....
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PMID: 20158199
PDF is available here.
PDF is available here.
Abstract
We report the 1.7 A crystal structure of the RtcA-AMP intermediate, which reveals the mechanism of nucleotidyl transfer. Adenylate is linked via a phosphoamide bond to the His309 Nepsilon atom. A network of hydrogen bonds to the ribose O2' and O3' accounts for the stringent ribonucleotide preference...
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PMID: 20399182
PDF is available here.
PDF is available here.
Physical Review Letters (104)9 2010
Abstract
Realistic ion-ion and ion-surface potentials from explicit-water simulations are used in implicit-solvent Monte Carlo simulations to study the ionic structure and double-layer forces in a nanometer slab confinement. The highly salt-specific results can be reproduced and rationalized by a simple nonl...
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PMID: 20367012
PDF is available here.
PDF is available here.
Abstract
I organic anions (fluorescein or salicylate) was associated with increased fluid secretion rates and increased fluxes of both salicylate and the type II organic anion methotrexate. By contrast, chronic exposure to dietary methotrexate was associated with increased fluid secretion rate and increased...
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PMID: 20077573
PDF is available here.
PDF is available here.
Abstract
The unilamellar liposomes of dimyristoylphosphatidylcholine (DMPC), marked with chlorophyll a (Chla), have been chosen as suitable models in studies aimed at determining the effects of natural antioxidant quercetin (QCT) and Hofmeister series anions on lipid bilayers. The variations of steady state...
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PMID: 20371879
PDF is available here.
PDF is available here.
Abstract
3-Dialkylaminomethyl substituted salicylaldoximes are efficient metal salt extractants, and, in contrast to related "salen"-based reagents, are sufficiently stable to acid hydrolysis to allow commercial application in base metal recovery. Crystal structures show that metal salts are bound by a zwitt...
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PMID: 20449420
PDF is available here.
PDF is available here.