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Tungsten Compounds (1):
Recent article
Tungsten Compounds
Abstract
Our results indicate that the stability of the complexes between W and proteins is not too high enough to remain unaltered during protein separation by SDS-PAGE in denaturing and reducing conditions. However, the procedures for in-solution tryptic digestion and for ESI-MS analysis in MeOH/H(2)O/with...
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PMID: 21530773
PDF is available here.
PDF is available here.
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Abstract
Benzoyl radicals are generated directly from (hetero)aromatic aldehydes upon tetrabutylammonium decatungstate ((n-Bu(4)N)(4)W(10)O(32)), TBADT) photocatalysis under mild conditions. In the presence of alpha,beta-unsaturated esters, ketones and nitriles radical conjugate addition ensues and gives the...
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PMID: 20661511
PDF is available here.
PDF is available here.
Abstract
We physiologically characterized CSH and pharmacological action of tungstate, using a nymphalid butterfly Junonia orithya. We first showed that the precise patterns of modification were dependent on the time-point of the cold-shock treatment after pupation, and confirmed that the modification proper...
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PMID: 20206631
PDF is available here.
PDF is available here.
Bioresource Technology (101)15 2010
Abstract
Oxidation of the manganese-substituted polyoxometalate [SiW(11)Mn(II)(H(2)O)O(39)](6-) (SiW(11)Mn(II)) to [SiW(11)Mn(III)(H(2)O)O(39)](5-) (SiW(11)Mn(III)), one of the most selective polyoxometalates for the kraft pulp delignification, by versatile peroxidase (VP) was studied. First, SiW(11)Mn(II) w...
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PMID: 20236822
PDF is available here.
PDF is available here.
Abstract
Heteropolyoxometalate complexes have been widely applied in many fields. In this paper, the interaction between a series of novel rare earth molybdotungstosilicate heteropolyoxometalates, K(10)H(3)[Ln(SiMo(6)W(5)O(39))(2)].xH(2)O (abbr. LnW(5), Ln = Pr (x = 30), Gd (x = 29), Dy (x = 28), and Yb (x =...
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PMID: 19760352
PDF is available here.
PDF is available here.
Abstract
We present an approach to gain well-dispersed nanoparticles in physiological media. Therefore, a step-by-step procedure is demonstrated on two different tungsten carbide nanopowders which can be transferred to other powders. The procedure includes a comprehensive powder characterization, followed by...
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PMID: 20795896
PDF is available here.
PDF is available here.
Abstract
We describe a divanadium-substituted phosphotungstate that catalyses the stereo- and regioselective hydroxylation of alkanes with hydrogen peroxide as the sole oxidant. Both cyclic and acyclic alkanes were oxidized to form alcohols with greater than 96% selectivity. The bulky polyoxometalate framewo...
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PMID: 20489717
PDF is available here.
PDF is available here.
Biological Trace Element Research (135)1-3 2010
Abstract
In this paper, the biological activation of heteropoly complex of molybdotungstosilicate containing lanthanum K(10)H(3)La(SiMo(6)W(5)O(39))(2)x26H(2)O (LaW(5)) was investigated by spectroscopic approach and microcalorimetry under the human physiological conditions. Fluorescence spectroscopy in combi...
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PMID: 19680606
PDF is available here.
PDF is available here.
Abstract
The two heteropolyacids H(3)PW(12)O(40) and H(3)PMo(12)O(40), and their homologous salts (NH(4))(3)PW(12)O(40), and (NH(4))(3)PMo(12)O(40) were prepared and tested in the cationic polymerization of styrene. The results showed that the heteropolytungstates were more reactive than the heteropolymolybd...
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PMID: 20657482
PDF is available here.
PDF is available here.
Abstract
Our findings showed efficient catalytic activities for A and B....
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PMID: 20428060
PDF is available here.
PDF is available here.
Abstract
A nitrite sensor based on immobilized Dawson-type tungstophosphate alpha-K(7)[H(4)PW(18)O(62)].18H(2)O (PW(18)) in multilayers of charged polyelectrolyte poly(allylamine hydrochloride) (PAH) on a glassy carbon electrode is described. A nitrite sensor manufactured with 10 layers has a sensitivity of...
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PMID: 20152463
PDF is available here.
PDF is available here.
Abstract
The cationic ring-opening polymerization reaction of tetrahydrofuran at 20 degrees C was catalyzed by H3PW12O40 x 13 H2O as solid acid catalyst. The effect of the proportions of acetic anhydride and catalyst, reaction time and support on the polymerization reaction was investigated. It has been foun...
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PMID: 20335988
PDF is available here.
PDF is available here.
Medical Physics (37)1 2010
Abstract
This prototype system shows a large improvement in low contrast detectability over current MVCBCT systems....
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PMID: 20175488
PDF is available here.
PDF is available here.
Abstract
A Keggin-type polyoxometalate (Cs(1.5)H(1.5)PW(12)O(40))-supported Pd catalyst is efficient for the direct synthesis of H(2)O(2) from H(2) and O(2) in the absence of any acid or halide additives under atmospheric pressure.
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PMID: 20448984
PDF is available here.
PDF is available here.
Abstract
We show that from the combined analysis of the multifrequency MF- and HF-EPR spectra and of the optical data, an accurate description of the ground multiplet of the Kramers rare earth ions in solid matrices can be derived....
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PMID: 19624207
PDF is available here.
PDF is available here.
Abstract
Owing to increased safety concerns about synthetic antioxidants, exploitation of safer antioxidants based on natural origin is the focus of research nowadays. Cumin is a common spice and is used as a routine supportive cooking agent. Extracts of cumin were prepared in methanol, ethanol, dichlorometh...
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PMID: 18720171
PDF is available here.
PDF is available here.
Nanotechnology (20)10 2009
Abstract
Carbon nanotubes loaded with peptides, proteins and drugs can translocate across the cell membrane. This big advantage has attracted increasing attention to design a novel delivery system using nanotubes. Polyoxometalate (POM) is a promising antitumor drug and it shows a very strong interaction with...
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PMID: 19417508
PDF is available here.
PDF is available here.
Abstract
Advances in atomic resolution in situ environmental transmission electron microscopy for direct probing of gas-solid reactions, including at very high temperatures (approximately 2000 degrees C) are described. In addition, recent developments of dynamic real time in situ studies at the Angstrom leve...
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PMID: 19140163
PDF is available here.
PDF is available here.
Abstract
PRIMARY USES OR EXPOSURES: Hard-metals are manufactured by a process of powder metallurgy from tungsten and carbon (tungsten carbide), and small amounts of other metallic compounds using cobalt as a binder. Hard metals are used to make cutting and grinding tools, dies, and wear products for a broad...
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PMID: 20737002
PDF is available here.
PDF is available here.
Abstract
The syntheses and structures of hafnium(iv) and zirconium(iv) complexes with Keggin tri-lacunary polyoxometalates (POM) [A-alpha-PW(9)O(34)](9-), i.e., (Et(2)NH(2))(7)H(2)[Hf(3)(micro-OH)(3)(A-alpha-PW(9)O(34))(2)].11H(2)O (Et(2)NH(2)-) and (Et(2)NH(2))(7)H(2)[Zr(3)(micro-OH)(3)(A-alpha-PW(9)O(34))(...
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PMID: 19156274
PDF is available here.
PDF is available here.
Abstract
We evaluated some biochemical parameters of the parotid salivary gland of streptozotocin-induced diabetic rats treated with sodium tungstate solution (2 mg/ml). The studied groups were: untreated control (UC), treated control (TC), untreated diabetic (UD), and treated diabetic (TD). After 2 and 6 we...
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PMID: 18810331
PDF is available here.
PDF is available here.
Abstract
The effect of vanadium oxyanions on genome of soybean (Glycine max L., Merr.) in tungsten-resistant cell line was studied. The line is resistant to V(5+)-oxyanions. RAPD-amplicons with identical length are differentially synthesized from DNAs of tungsten-resistant cell line as well as of the initial...
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PMID: 19938645
PDF is available here.
PDF is available here.
BMC Genomics (10)1 2009
Abstract
Streptozotocin (STZ)-diabetic rats were treated orally with tungstate for five weeks. Treated (STZ)-diabetic rats showed a partial recovery of exocrine and endocrine function, with lower glycemia, increased insulinemia and amylasemia, and increased beta cell mass achieved by reducing beta cell apopt...
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PMID: 19715561
PDF is available here.
PDF is available here.
Neuropharmacology (55)7 2008
Abstract
We have tested the effectiveness and physiological effects of POM-1 with cerebellar and hippocampal slices. Using the malachite green phosphate assay, HPLC and biosensor measurements we have found that POM-1 is more effective at blocking ATP breakdown in cerebellar slices than ARL 67156. The site of...
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PMID: 18768144
PDF is available here.
PDF is available here.
Abstract
Dolphins identify their prey using broadband sonar signals. The broadband spectrum of the target strength (TS) of fish is believed to be a key factor in target discrimination. In this study, the TS spectrum was measured using sonar signals generated by two different dolphin species: finless porpoise...
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PMID: 19206773
PDF is available here.
PDF is available here.
Acta Crystallographica Section B (64)Pt 6 2008
Abstract
The single-crystal diffraction study of Ce10W22O81 and powder X-ray diffraction (XRD) experiments on Ce10W22O81 and Nd10W22O81 show that the true space group of these phases is Pbnm, contrary to the previous literature reports of the space groups Pbcn and Pbcm for the rare-earth tungstates (RE = La,...
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PMID: 19029700
PDF is available here.
PDF is available here.
Dental Materials (24)12 2008
Abstract
It is proposed that the wires coated with these nanoparticles might offer a novel opportunity to substantially reduce friction during tooth movement. A few tests undertaken to evaluate the toxicity of the fullerene-like nanoparticles have provided indications that they might be biocompatible....
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PMID: 18495238
PDF is available here.
PDF is available here.
Abstract
Diabetes is a major public health problem. Development of new therapies that are able to improve glycemia management, cure diabetes, and can even protect from it, are of great interest. This study investigated the protective effect of sodium tungstate against STZ-induced beta-cell damages by means o...
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PMID: 18400503
PDF is available here.
PDF is available here.
Abstract
The pH-controlled assembly/disassembly of a nanoscale {P4W52O178}24- cluster at pH 2 to a {P4W44O152}20- cluster at pH 3-5 via a {P3W39O134}19- cluster species at pH 2-3 to finally give {P2W19O69(OH2)}14- at pH 6 is reported. This process can be traced in the solid state crystallographically and in...
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PMID: 18937461
PDF is available here.
PDF is available here.
Abstract
The fluorine doped ZnWO4 photocatalyst was synthesized by hydrothermal synthesis and annealing treatment. The existing states of fluorine in the crystal were elucidated, and the effects of fluorine on the crystal structure, photocatalytic activity, and degradative intermediates were investigated. Th...
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PMID: 19068841
PDF is available here.
PDF is available here.
Abstract
A new potentially promising visible-light driven photobioreactor synthesizes fine chemical via photobiocatalysis by generating NADH in a non-enzymatic light-driven process and coupling it to the enzymatic dark reaction catalysis.
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PMID: 18985231
PDF is available here.
PDF is available here.
Abstract
We used the heterologous expression systems of human sulfite oxidase and Rhodobacter sphaeroides dimethylsulfoxide reductase in E. coli to study the incorporation of different metal ions into the molybdopterin site of these enzymes. From the added metal-containing compounds Na(2)MoO(4), Na(2)WO(4),...
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PMID: 18959753
PDF is available here.
PDF is available here.
Abstract
We hypothesized that IR increases postcapillary venular hydraulic conductivity and that IR-mediated changes in hydraulic conductivity result from temporally and mechanistically separate processes. A microcannulation technique was used to determine hydraulic conductivity (Lp) in rat mesenteric postca...
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PMID: 18790838
PDF is available here.
PDF is available here.
Abstract
Abstract
We examined the effects of 30 days of oral administration of tungstate on disaccharidase and Na+/D-glucose cotransporter (SGLT1) activity in the jejunum of control and streptozotocin-induced diabetic rats. Diabetes increased sucrase-specific activity in the jejunal mucosa but did not affect the acti...
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PMID: 18617558
PDF is available here.
PDF is available here.
Abstract
We outlined previously. This is due to the special chemical feature of such clusters, which can be treated as Na 2HPO 4-type electrolytes in solution. The kinetics of the blackberry formation can be controlled by temperature....
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PMID: 18680322
PDF is available here.
PDF is available here.
Abstract
The layer-by-layer assembly (LBL) is a new method of thin film deposition often used for oppositely charged polyelectrolytes. LBL technique has been extensively used to make multilayer films of polyions with biomolecules such as proteins, enzymes and DNA. It can also be successfully applied to the p...
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PMID: 19093577
PDF is available here.
PDF is available here.
Abstract
This study investigated the bond strength of heat-polymerized acrylic resin to titanium alloy using a proprietary bonding agent (GC Metalprimer II). Two surface treatments (sandblasted or roughened with a tungsten carbide bur) were compared for their effect on bond strength with or without thermal c...
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PMID: 19051556
PDF is available here.
PDF is available here.
Angle Orthodontist (78)5 2008
Abstract
The polishing techniques affected surface roughness significantly. There were significant differences between the groups; higher Ra values were obtained with the use of porcelain polishing wheel and polishing paste (P < .001). CONCLUSION: The application of Sof-Lex discs can produce smoother porcela...
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PMID: 18298209
PDF is available here.
PDF is available here.
Journal of Physical Chemistry B (112)33 2008
Abstract
The water inside reverse micelles can differ dramatically from bulk water. Some changes in properties can be attributed to the interaction of water molecules with the micellar interface, forming a layer of shell water inside the reverse micelle. The work reported here monitors changes in intramicell...
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PMID: 18651765
PDF is available here.
PDF is available here.
Inorganic Chemistry (47)15 2008
Abstract
The redox speciation of Eu(III) in the 1:1 stoichiometric complex with the alpha-1 isomer of the Wells-Dawson anion, [alpha-1-P 2W 17O 61] (10-), was studied by electrochemical techniques (cyclic voltammetry and bulk electrolysis), in situ XAFS (X-ray absorption fine structure) spectroelectrochemist...
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PMID: 18616240
PDF is available here.
PDF is available here.
Abstract
The cloud point extraction behavior of Sn(II) and Sn(IV) using alpha-polyoxometalate and mixed surfactants solution was investigated. The mixture of a nonionic surfactant (Triton X-100) and a cationic surfactant (CTAB) was utilized as a suitable micellar medium for preconcentration and extraction of...
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PMID: 18585313
PDF is available here.
PDF is available here.
Free Radical Research (42)8 2008
Abstract
The occupational exposure to cobalt/tungsten carbide (Co/WC) dusts causes asthma and interstitial fibrosis. The International Agency for Research on Cancer (IARC) recently classified the mixture Co/WC as probably carcinogenic to humans (group 2A). The mechanism of action of Co/WC involves particle d...
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PMID: 18712631
PDF is available here.
PDF is available here.
Abstract
Since its inception, endovascular coil technology has grown substantially as multiple manufacturers entered the market with an ever-increasing number of new products. Practitioners are now inundated with a choice of coils that vary on the basis of factors such as size, composition, stiffness, and de...
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PMID: 18417605
PDF is available here.
PDF is available here.
Abstract
A series of dye-polyoxometalate composite films were prepared by alternately depositing cationic dye molecules and anionic polyoxometalates such as Keggin-type [BW(12)O(40)](5-) and the sandwich complex [Co(4)(H(2)O)(2)(PW(9)O(34))(2)](10-)via layer-by-layer (LbL) self-assembly method. These cationi...
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PMID: 18533177
PDF is available here.
PDF is available here.
Abstract
The interaction of 20 wt% 12-tungstophosphoric acid with Ce(x)Zr(1-x)O(2) solid solutions has been studied by PXRD, FTIR, FT-Raman, H(2)-TPR, NH(3)-TPD, diffuse reflectance UV-vis-NIR, and (31)P MAS NMR techniques. The study indicates that the Keggin anions are attached to Lewis metal ion centres an...
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PMID: 18502441
PDF is available here.
PDF is available here.
Chemistry & Biology (15)7 2008
Abstract
Protein kinase CK2 is a multifunctional kinase of medical importance that is dysregulated in many cancers. In this study, polyoxometalates were identified as original CK2 inhibitors. [P2Mo18O62](6-) has the most potent activity. It inhibits the kinase in the nanomolar range by targeting key structur...
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PMID: 18635005
PDF is available here.
PDF is available here.
Abstract
We present the crystal structure of a molybdate/tungstate ABC transporter (ModBC) from Methanosarcina acetivorans in a trans-inhibited state. The regulatory domains of the nucleotide-binding subunits are in close contact and provide two oxyanion binding pockets at the shared interface. By specifical...
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PMID: 18511655
PDF is available here.
PDF is available here.
Inorganic Chemistry (47)13 2008
Abstract
A novel pentadecatungstate, [H 6Ce 2(H 2O)Cl(W 5O 18) 3] (7-) ( 1), constructed by a dinuclear cerium unit and 15-member ring WO 6 units was prepared and characterized by single-crystal X-ray diffraction. Polyanion 1 exhibits blue photoluminescence with an emission maximum at 488 nm, which is charac...
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PMID: 18533627
PDF is available here.
PDF is available here.
Abstract
Results suggested that sodium tungstate if administrated before STZ injection improves glycemic state by a direct effect on pancreatic beta-cells and preserves them by reducing the activity of these cells at the time of STZ injection, reducing STZ-induced oxidative stress, reducing insulin secretion...
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PMID: 18762817
PDF is available here.
PDF is available here.
Diabetologia (51)7 2008
Abstract
Tungstate increased 2-deoxy-D: -glucose uptake in differentiated L6 myotubes through an increase in the total amount and translocation of GLUT4 transporter. The effects on glucose uptake were additive to those of insulin. Tungstate activated transcription of the Glut4 promoter, as shown by an increa...
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PMID: 18483800
PDF is available here.
PDF is available here.
Abstract
In the presence of oxygen, organic compounds can be oxidized by zerovalent iron or dissolved Fe(II). However, this process is not a very effective means of degrading contaminants because the yields of oxidants are usually low (i.e., typically less than 5% of the iron added is converted into oxidants...
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PMID: 18678027
PDF is available here.
PDF is available here.
Journal of Chromatography A (1195)1-2 2008
Abstract
Macroporous cellulose-tungsten carbide composite beads was designed and prepared as an anion-exchanger for expanded bed adsorption (EBA). The wet density of composite beads was adjusted at the range of 1.2-2.4 g/ml with the control of tungsten carbide addition, and optimized for EBA at high fluid ve...
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PMID: 18508064
PDF is available here.
PDF is available here.
Inorganic Chemistry (47)12 2008
Abstract
Four new hybrids based on the Wells-Dawson polyoxometalate [P2W18O62](6-) (P2W18), ([Ag(bipy)]2[P2W18O62]).2[H2bipy].4H2O (1), ([Ag(bipy)]4[P2W18O62]).2[Hbipy](2), K[P2W18O62].2.5[H2bipy].2H2O (3), and [P2W18O62] 2.[H2bipy]4.[Hbipy]4 .3H2O (4), were hydrothermally synthesized and structurally charac...
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PMID: 18481844
PDF is available here.
PDF is available here.
Inorganic Chemistry (47)12 2008
Abstract
In this paper, the relationship between the reversible redox properties and the second-order nonlinear optical (NLO) responses for the title series of complexes has been systematically investigated by using the time-dependent density functional theory (TDDFT) method combined with the sum-over-states...
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PMID: 18491889
PDF is available here.
PDF is available here.
Abstract
From 50 teeth, 531 histologic sections were obtained, of which 264 had been treated with ceramic burs and 267 with tungsten carbide burs. Of the sections treated with ceramic burs, 89.8% were caries-free, as were 92.1% of specimens treated with conventional burs. After excavation with ceramic burs,...
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PMID: 19057746
PDF is available here.
PDF is available here.
Abstract
This paper describes the use of cyclic voltammetry (CV), spectrophotometric methods [Trolox equivalent antioxidant capacity (TEAC), peroxyl radical trapping capacity (PRTC), DPPH radical scavenging activity (RSA), and Folin-Ciocalteu reagent (FCR) reducing capacity], and photochemiluminescence (PCL)...
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PMID: 18454541
PDF is available here.
PDF is available here.
Abstract
Two-way ANOVA showed that the effects of dentin surface preparations, adhesive systems, and their interaction were statistically significant (p < 0.001). The muTBS was the highest when bonding SE to dentin surface prepared with 600-grit SiC abrasive paper (47.3 +/- 7.4 MPa), followed by high-speed t...
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PMID: 18652265
PDF is available here.
PDF is available here.
Abstract
We report on investigations into the photophysics of a rare-earth (europium) POM with the protein bovine serum albumin (BSA). Via the use of luminescence anisotropy and time-resolved measurements the europium decatungstate was found to interact with BSA, which was accompanied by an observed enhancem...
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PMID: 18528560
PDF is available here.
PDF is available here.
Chemosphere (72)2 2008
Abstract
The photocatalytic inactivation (PCI) of Escherichia coli (Gram-negative) and Bacillus subtilis (Gram-positive) was performed using polyoxometalate (POM) as a homogeneous photocatalyst and compared with that of heterogeneous TiO2 photocatalyst. Aqueous suspensions of the microorganisms (10(7)-10(8)c...
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PMID: 18343481
PDF is available here.
PDF is available here.