tungsten compounds

Summary

Summary: Inorganic compounds that contain tungsten as an integral part of the molecule.

Top Publications

  1. ncbi A role for tungsten in the biology of Campylobacter jejuni: tungstate stimulates formate dehydrogenase activity and is transported via an ultra-high affinity ABC system distinct from the molybdate transporter
    Jonathan P Smart
    Department of Molecular Biology and Biotechnology, The University of Sheffield, Firth Court, Western Bank, Sheffield S10 2TN, UK
    Mol Microbiol 74:742-57. 2009
  2. ncbi New enzymatic method for the determination of total phenolic content in tea and wine
    Roberto Stevanato
    Department of Physical Chemistry, University of Venice, Dorsoduro 2137, 30123 Venice, Italy
    J Agric Food Chem 52:6287-93. 2004
  3. ncbi Nanostructured hydroxyapatite as filler for methacrylate-based root canal sealers
    F M Collares
    Dental Materials Laboratory, School of Dentistry, Federal University of Rio Grande do Sul, 2492 Rio Branco, Porto Alegre, RS, Brazil
    Int Endod J 45:63-7. 2012
  4. ncbi Agglomeration of tungsten carbide nanoparticles in exposure medium does not prevent uptake and toxicity toward a rainbow trout gill cell line
    Dana Kühnel
    Department of Bioanalytical Ecotoxicology, Helmholtz Centre for Environmental Research Leipzig, Germany
    Aquat Toxicol 93:91-9. 2009
  5. ncbi Investigation of the photocatalytic activity of TiO2--polyoxometalate systems
    R R Ozer
    Department of Chemistry and Biochemistry, University of South Carolina, Columbia 29208, USA
    Environ Sci Technol 35:3242-6. 2001
  6. ncbi The glucose-lowering agent sodium tungstate increases the levels and translocation of GLUT4 in L6 myotubes through a mechanism associated with ERK1/2 and MEF2D
    M D Giron
    Department of Biochemistry and Molecular Biology II, School of Pharmacy, University of Granada, Campus de Cartuja sn, 18071, Granada, Spain
    Diabetologia 51:1285-95. 2008
  7. ncbi Self-assembly of nanosized 0D clusters: CdS quantum dot-polyoxotungstate nanohybrids with strongly coupled electronic structures and visible-light-active photofunctions
    Hyo Na Kim
    Center for Intelligent Nano Bio Materials CINBM, Department of Chemistry and Nano Sciences, Ewha Womans University, Seoul, Korea
    Chemistry 17:9626-33. 2011
  8. ncbi Target identification of the novel antiobesity agent tungstate in adipose tissue from obese rats
    Silvia Barcelo-Batllori
    Endocrinology and Diabetes Unit, Laboratory of Experimental Diabetes, Institut d Investigacions Biomediques August Pi i Sunyer IDIBAPS, Hospital Clinic de Barcelona, Faculty of Medicine, University of Barcelona, Villaroel 170, E 08036 Barcelona, Spain
    Proteomics 5:4927-35. 2005
  9. ncbi Tungstate decreases weight gain and adiposity in obese rats through increased thermogenesis and lipid oxidation
    Marc Claret
    Endocrinology and Nutrition Unit, Institut d Investigacions Biomediques de Barcelona, 08036 Barcelona, Spain
    Endocrinology 146:4362-9. 2005
  10. ncbi Tungstate is an effective antidiabetic agent in streptozotocin-induced diabetic rats: a long-term study
    A Barbera
    Department of Biochemistry and Molecular Biology, University of Barcelona, Spain
    Diabetologia 44:507-13. 2001

Research Grants

Detail Information

Publications195 found, 100 shown here

  1. ncbi A role for tungsten in the biology of Campylobacter jejuni: tungstate stimulates formate dehydrogenase activity and is transported via an ultra-high affinity ABC system distinct from the molybdate transporter
    Jonathan P Smart
    Department of Molecular Biology and Biotechnology, The University of Sheffield, Firth Court, Western Bank, Sheffield S10 2TN, UK
    Mol Microbiol 74:742-57. 2009
    ..Furthermore, possession of two MoeA paralogues may explain the formation of both molybdopterin and tungstopterin in this bacterium...
  2. ncbi New enzymatic method for the determination of total phenolic content in tea and wine
    Roberto Stevanato
    Department of Physical Chemistry, University of Venice, Dorsoduro 2137, 30123 Venice, Italy
    J Agric Food Chem 52:6287-93. 2004
    ..The differences of the total phenols content found by applying the three methods are discussed in terms of the different specificities of the analytical basis...
  3. ncbi Nanostructured hydroxyapatite as filler for methacrylate-based root canal sealers
    F M Collares
    Dental Materials Laboratory, School of Dentistry, Federal University of Rio Grande do Sul, 2492 Rio Branco, Porto Alegre, RS, Brazil
    Int Endod J 45:63-7. 2012
    ..To evaluate the effect of different concentrations of nanostructured hydroxyapatite on the radiopacity, flow and film thickness of an experimental root canal sealer...
  4. ncbi Agglomeration of tungsten carbide nanoparticles in exposure medium does not prevent uptake and toxicity toward a rainbow trout gill cell line
    Dana Kühnel
    Department of Bioanalytical Ecotoxicology, Helmholtz Centre for Environmental Research Leipzig, Germany
    Aquat Toxicol 93:91-9. 2009
    ..Taken together, our findings indicate that minimal exposure media can lead to rapid agglomeration of nanoparticles but that agglomeration does not prevent uptake into cells and the expression of toxicity...
  5. ncbi Investigation of the photocatalytic activity of TiO2--polyoxometalate systems
    R R Ozer
    Department of Chemistry and Biochemistry, University of South Carolina, Columbia 29208, USA
    Environ Sci Technol 35:3242-6. 2001
    ..0818, 0.152, 0.421, and 0.638 min(-1), respectively. An analysis of deltaG for electron transfer from the conduction band of TiO2 to POMs in this study shows that the electron transfer takes place even when it is endothermic...
  6. ncbi The glucose-lowering agent sodium tungstate increases the levels and translocation of GLUT4 in L6 myotubes through a mechanism associated with ERK1/2 and MEF2D
    M D Giron
    Department of Biochemistry and Molecular Biology II, School of Pharmacy, University of Granada, Campus de Cartuja sn, 18071, Granada, Spain
    Diabetologia 51:1285-95. 2008
    ..The aim of this study was to investigate the action of the glucose-lowering compound sodium tungstate on glucose transport in muscle myotubes and to unravel the molecular events underlying the effects observed...
  7. ncbi Self-assembly of nanosized 0D clusters: CdS quantum dot-polyoxotungstate nanohybrids with strongly coupled electronic structures and visible-light-active photofunctions
    Hyo Na Kim
    Center for Intelligent Nano Bio Materials CINBM, Department of Chemistry and Nano Sciences, Ewha Womans University, Seoul, Korea
    Chemistry 17:9626-33. 2011
    ..e., visible-induced photochromism and photocatalysis) by means of strong electronic coupling...
  8. ncbi Target identification of the novel antiobesity agent tungstate in adipose tissue from obese rats
    Silvia Barcelo-Batllori
    Endocrinology and Diabetes Unit, Laboratory of Experimental Diabetes, Institut d Investigacions Biomediques August Pi i Sunyer IDIBAPS, Hospital Clinic de Barcelona, Faculty of Medicine, University of Barcelona, Villaroel 170, E 08036 Barcelona, Spain
    Proteomics 5:4927-35. 2005
    ..These findings open new avenues for the study of the aetiology of obesity and its treatment...
  9. ncbi Tungstate decreases weight gain and adiposity in obese rats through increased thermogenesis and lipid oxidation
    Marc Claret
    Endocrinology and Nutrition Unit, Institut d Investigacions Biomediques de Barcelona, 08036 Barcelona, Spain
    Endocrinology 146:4362-9. 2005
    ..Furthermore, treatment increased the number of small adipocytes with a concomitant induction of apoptosis. Our results indicate that tungstate treatment may provide the basis for a promising novel therapy for obesity...
  10. ncbi Tungstate is an effective antidiabetic agent in streptozotocin-induced diabetic rats: a long-term study
    A Barbera
    Department of Biochemistry and Molecular Biology, University of Barcelona, Spain
    Diabetologia 44:507-13. 2001
    ..In this study, we examined the effectiveness of long-term tungstate treatment of streptozotocin-induced-diabetic rats...
  11. ncbi Stable and functional regeneration of pancreatic beta-cell population in nSTZ-rats treated with tungstate
    J Fernandez-Alvarez
    Department of Medicine, Hospital Clínic Institut d Investigacions Biomèdiques August Pi i Sunyer IDIBAPS, University of Barcelona, Barcelona, Spain
    Diabetologia 47:470-7. 2004
    ..Sodium tungstate has recently emerged as an effective oral treatment for diabetes. We examined the effects of tungstate administration in the beta-cell mass of the pancreas as well as its therapeutic potential...
  12. ncbi The antidiabetic agent sodium tungstate activates glycogen synthesis through an insulin receptor-independent pathway
    Jorge E Domínguez
    IRBB Barcelona Science Park, Josep Samitier, 1 5, E 08028 Barcelona, Spain
    J Biol Chem 278:42785-94. 2003
    ..These results show a direct involvement of ERK1/2 in the mechanism of action of tungstate at the hepatic level...
  13. ncbi Sodium tungstate decreases the phosphorylation of tau through GSK3 inactivation
    Alberto Gómez-Ramos
    Centro de Biologia Molecular, CSIC UAM, Facultad de Ciencias, Universidad Autonoma de Madrid, Cantoblanco, Madrid, Spain
    J Neurosci Res 83:264-73. 2006
    ..The phosphorylation at these sites is involved in reduction of the interaction of tau with microtubules that occurs in Alzheimer's disease...
  14. ncbi Insulin-like actions of tungstate in diabetic rats. Normalization of hepatic glucose metabolism
    A Barbera
    Department of Biochemistry and Physiology, School of Chemistry, University of Barcelona, Spain
    J Biol Chem 269:20047-53. 1994
    ..Tungstate administration in healthy animals also affected all these parameters, although to a much lesser extent. All these effects were similar to those previously reported for vanadate, suggesting a common mechanism of action in vivo...
  15. ncbi Inhibition of phosphatase and sulfatase by transition-state analogues
    P J Stankiewicz
    Department of Chemistry, Simon Fraser University, Burnaby, British Columbia, Canada
    Biochemistry 27:206-12. 1988
    ..The relevance of these observations to the effects of transition metal oxyanions on protein phosphatases in vivo is discussed...
  16. ncbi Distribution of conjugated and free phenols in fruits: antioxidant activity and cultivar variations
    U Imeh
    Procter Department of Food Science, University of Leeds, LS2 9JT, UK
    J Agric Food Chem 50:6301-6. 2002
    ..The calculated dietary intake of total, free, and conjugated phenols from average per capita consumption of apples and pears in different regions of the U.K. varied between 104-126, 53-64, and 51-62 mg of CtE/day, respectively...
  17. ncbi In vitro expression of hard metal dust (WC-Co)--responsive genes in human peripheral blood mononucleated cells
    Noömi Lombaert
    Vrije Universiteit Brussel, Laboratorium voor Cellulaire Genetica, Pleinlaan 2, B 1050 Brussel, Belgium
    Toxicol Appl Pharmacol 227:299-312. 2008
    ..Overall, this study provides the first analysis of gene expression induced by the WC-Co mixture showing a large profile of gene modulation and giving a preliminary indication for a hypoxia mimicking environment induced by WC-Co exposure...
  18. ncbi Long-term beneficial effects of vanadate, tungstate, and molybdate on insulin secretion and function of cultured beta cells
    Hui Kang Liu
    School of Biomedical Sciences, University of Ulster, Coleraine, Northern Ireland, UK
    Pancreas 28:364-8. 2004
    ..These observations suggest significant effects of ultratrace elements on pancreatic beta cells that may contribute to their antihyperglycemic action...
  19. ncbi Phosphorylation events implicating p38 and PI3K mediate tungstate-effects in MIN6 beta cells
    Sandra Piquer
    Endocrinology and Diabetes Unit, Department of Medicine, Hospital Clinic IDIBAPS, University of Barcelona, Barcelona, Spain
    Biochem Biophys Res Commun 358:385-91. 2007
    ..These results show a direct involvement of p38 and PI3K phosphorylation in the mechanism of action of tungstate in the beta cell...
  20. ncbi Effects of tungstate, a new potential oral antidiabetic agent, in Zucker diabetic fatty rats
    M C Munoz
    Department of Biochemistry and Molecular Biology, Universitat de Barcelona, Spain
    Diabetes 50:131-8. 2001
    ..These data suggest that tungstate administration to ZDF rats causes a considerable reduction of glycemia, mainly through a partial restoration of hepatic glucose metabolism and a decrease in lipotoxicity...
  21. ncbi Evaluation of the apoptogenic potential of hard metal dust (WC-Co), tungsten carbide and metallic cobalt
    Noömi Lombaert
    Laboratorium voor Cellulaire Genetica, Vrije Universiteit Brussel, Pleinlaan 2, B 1050 Brussel, Belgium
    Toxicol Lett 154:23-34. 2004
    ..The apoptogenic properties of these metals may be important in the mechanism of lung pathologies induced by the cobalt-containing particles...
  22. ncbi Comparative evaluation of the in vitro micronucleus test and the alkaline single cell gel electrophoresis assay for the detection of DNA damaging agents: genotoxic effects of cobalt powder, tungsten carbide and cobalt-tungsten carbide
    F van Goethem
    Laboratory of Antropogenetics, Faculty of Science, Free University Brussels VUB, Belgium
    Mutat Res 392:31-43. 1997
    ..Combination of the comet assay and the in vitro MN test might therefore be recommended for genotoxins to understand the mechanisms underlying mutagenicity and to assess the lowest efficient dose...
  23. ncbi Modulation of glucose transporters in rat diaphragm by sodium tungstate
    M D Giron
    Department of Biochemistry and Molecular Biology, School of Pharmacy, University of Granada, Campus de Cartuja sn, E 18071 Granada, Spain
    FEBS Lett 542:84-8. 2003
    ..We conclude that the normoglycemic effect of tungstate may be partly due to a normalization of the levels and subcellular localization of GLUT4, which should result in an increase in muscle glucose uptake...
  24. ncbi Sodium tungstate regulates food intake and body weight through activation of the hypothalamic leptin pathway
    M Amigó-Correig
    Laboratory of Diabetes and Obesity, Institut d Investigacions Biomediques August Pi i Sunyer, Endocrinology and Nutrition Unit Hospital Clínic, Barcelona, Spain
    Diabetes Obes Metab 13:235-42. 2011
    ....
  25. ncbi A functional leptin system is essential for sodium tungstate antiobesity action
    Ignasi Canals
    Diabetes and Obesity Laboratory, Institut d Investigacions Biomediques August Pi i Sunyer, Barcelona, Spain
    Endocrinology 150:642-50. 2009
    ..In summary, the results indicate that the effectiveness of tungstate in reducing body weight gain is completely dependent on a functional leptin system...
  26. ncbi Sodium tungstate decreases sucrase and Na+/D-glucose cotransporter in the jejunum of diabetic rats
    Montserrat Miró-Queralt
    Departament de Fisiologia, Facultat de Farmacia, INSA, Universitat de Barcelona, Av Joan XXIII s n, E 08028 Barcelona, Spain
    Am J Physiol Gastrointest Liver Physiol 295:G479-84. 2008
    ..We conclude that the antidiabetic effect of tungstate is partly due to normalization of the activity of sucrase and SGLT1 in the brush-border membrane of enterocytes...
  27. ncbi Activation of the hexose monophosphate shunt in rat type II pneumocytes as an early marker of oxidative stress caused by cobalt particles
    Peter H Hoet
    Laboratory of Pneumology Unit of Lung Toxicology, K U Leuven, Herestraat 49, 3000 Leuven, Belgium
    Arch Toxicol 76:1-7. 2002
    ..However, we were not able to show a simple relationship between the stimulation of the HMS and the subsequent cell damage...
  28. pmc Toxicity of tungsten carbide and cobalt-doped tungsten carbide nanoparticles in mammalian cells in vitro
    Susanne Bastian
    Department of Pediatric Neurology, University Children s Hospital Carl Gustav Carus, University of Technology Dresden, Dresden, Germany
    Environ Health Perspect 117:530-6. 2009
    ..To develop nanoparticles for broad applications, potential risks to human health and the environment should be evaluated and taken into consideration...
  29. ncbi Molybdate binding by ModA, the periplasmic component of the Escherichia coli mod molybdate transport system
    J Imperial
    Department of Nutritional Sciences, University of California Berkeley, Berkeley, CA 94720, USA
    Biochim Biophys Acta 1370:337-46. 1998
    ..The affinity of ModA for molybdate was also determined in vivo and found to be similar to that determined in vitro...
  30. ncbi Tungsten, the surprisingly positively acting heavy metal element for prokaryotes
    Jan R Andreesen
    Institute of Biology Microbiology, Martin Luther University Halle Wittenberg, Halle, Germany
    Ann N Y Acad Sci 1125:215-29. 2008
    ..By that process, tungsten finally becomes selectively incorporated into the few enzymes noted above...
  31. ncbi Integration of DIGE and bioinformatics analyses reveals a role of the antiobesity agent tungstate in redox and energy homeostasis pathways in brown adipose tissue
    Silvia Barcelo-Batllori
    Laboratory of Experimental Diabetes and Obesity, Endocrinology and Diabetes Unit, Hospital Clinic de Barcelona, E 08036 Barcelona, Catalonia, Spain
    Mol Cell Proteomics 7:378-93. 2008
    ....
  32. ncbi Tungstate treatment improves Leydig cell function in streptozotocin-diabetic rats
    Joan Ballester
    Unit of Animal Reproduction, Department of Animal Medicine and Surgery, School of Veterinary Medicine, Autonomous University of Barcelona, E 08193 Bellaterra, Spain
    J Androl 26:706-15. 2005
    ....
  33. ncbi Tungstate stimulates insulin release and inhibits somatostatin output in the perfused rat pancreas
    Ramona A Silvestre
    Hospital Universitario Puerta de Hierro and Department of Physiology, Universidad Autonoma de Madrid, San Martin de Porres 4, 28035 Madrid, Spain
    Eur J Pharmacol 519:127-34. 2005
    ....
  34. pmc Embedded weapons-grade tungsten alloy shrapnel rapidly induces metastatic high-grade rhabdomyosarcomas in F344 rats
    John F Kalinich
    Heavy Metals Research Team, Armed Forces Radiobiology Research Institute, Bethesda, Maryland 20889 5603, USA
    Environ Health Perspect 113:729-34. 2005
    ..These results point out the need for further studies investigating the health effects of tungsten and tungsten-based alloys...
  35. ncbi Degradation of tungsten coils implanted into the subclavian artery of New Zealand white rabbits is not associated with local or systemic toxicity
    Matthias Peuster
    Department of Pediatric Cardiology and Pediatric Intensive Care, Georg August University, Robert Koch Str 40, D 37075 Goettingen, Germany
    Biomaterials 24:393-9. 2003
    ..To assess whether corrosion of tungsten coils is related to residual shunting and to evaluate whether elevated tungsten serum levels are associated with local or systemic toxicity...
  36. pmc Ferrihydrite-dependent growth of Sulfurospirillum deleyianum through electron transfer via sulfur cycling
    Kristina L Straub
    Fakultat fur Biologie, Universitat Konstanz, 78457 Constance, Germany
    Appl Environ Microbiol 70:5744-9. 2004
    ..deleyianum. Instead, sulfur (elemental S or polysulfides) and/or thiosulfate as oxidized products could complete a sulfur cycle-mediated reduction of ferrihydrite...
  37. ncbi Contribution of the phenolic fraction to the antioxidant activity and oxidative stability of olive oil
    M Del Carlo
    Department of Food Science, University of Teramo, Via Carlo R Lerici 1, Mosciano Stazione, 64023 Teramo, Italy
    J Agric Food Chem 52:4072-9. 2004
    ....
  38. ncbi Photoelectron spectroscopy of doubly and singly charged group VIB dimetalate anions: M2O72-, MM'O72-, and M2O7- (M, M' = Cr, Mo, W)
    Hua Jin Zhai
    Department of Physics, Washington State University, 2710 University Drive, Richland, WA 99354, USA
    J Phys Chem A 109:10512-20. 2005
    ..The clusters identified might provide insights into the possible structures of reactive species present in early transition-metal oxide catalysts that are relevant to their reactivity and catalytic function...
  39. ncbi Synergetic effect of Bi2WO6 photocatalyst with C60 and enhanced photoactivity under visible irradiation
    Shengbao Zhu
    Department of Chemistry, Tsinghua University, Beijing, 100084, People s Republic of China
    Environ Sci Technol 41:6234-9. 2007
    ..The optimum synergetic effect is found at a weight ratio of 1.25 wt % (C60/Bi2WO6). The photocatalytic reaction process of C60-modified Bi2WO6 is mainly governed by direct holes and O2*- oxidation...
  40. ncbi Estimation of total phenolic content and other oxidation substrates in plant tissues using Folin-Ciocalteu reagent
    Elizabeth A Ainsworth
    USDA ARS Photosynthesis Research Unit, Urbana, Illinois 61801, USA
    Nat Protoc 2:875-7. 2007
    ..This assay is performed in microcentrifuge tubes and assessed in a 96-well plate reader. At least 64 samples can be processed in 1 d...
  41. ncbi Mechanism of [gamma-H2SiV2W10O40](4-)-catalyzed epoxidation of alkenes with hydrogen peroxide
    Yoshinao Nakagawa
    Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7 3 1 Hongo, Bunkyo ku, Tokyo 113 8656, Japan
    Inorg Chem 46:1727-36. 2007
    ..The kinetic and spectroscopic studies show that the present epoxidation proceeds via III. The energy diagram of the epoxidation with density functional theory (DFT) supports the idea...
  42. ncbi [Photocatalytic degradation of hexafluorobenzene by tungstophosphoric acid]
    Li Huang
    Institute of Environmental Science, Fudan University, Shanghai 200433, China
    Huan Jing Ke Xue 27:1501-7. 2006
    ..1%. O2, KMnO4 and K2S2O8 added in the solution were able to increase the defluorination of C6F6 via oxidating [PW12O40](4-). The defluorination of C6F6 would decline in the presence of alcohol and aromatic compounds...
  43. ncbi Density functional theory and Hartree-Fock studies: geometry, vibrational frequencies and electronic properties of Anderson-type heteropolyanion, [XM6O24]n- (X=TeVI, IVII and M=Mo, W) and [SbVW6O24]7-
    M H Alizadeh
    Department of Chemistry, Faculty of Sciences, Ferdowsi University, Mashhad 91779, Iran
    Spectrochim Acta A Mol Biomol Spectrosc 65:1104-11. 2006
    ..With attention to relative charge and size of the cavity occupied by XO(6) subunit in these anions, we suggest that the general formula [XO(6)(n-)@M(6)O(18)] to describe electronic properties of these anions...
  44. doi Efficient oxidative alkyne homocoupling catalyzed by a monomeric dicopper-substituted silicotungstate
    Keigo Kamata
    Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7 3 1 Hongo, Bunkyo ku, Tokyo 113 8656, Japan
    Angew Chem Int Ed Engl 47:2407-10. 2008
  45. ncbi Modeling the competitive effect of phosphate, sulfate, silicate, and tungstate anions on the adsorption of molybdate onto goethite
    Nan Xu
    Stevens Institute of Technology, Center for Environmental Systems, CES, Castle Point on Hudson, Hoboken, NJ 07030, USA
    Chemosphere 64:1325-33. 2006
    ..Our results indicate that surface complexation modeling may have applications in predicting competitive adsorption in more complex systems containing multiple competing ions...
  46. ncbi The chemistry behind antioxidant capacity assays
    Dejian Huang
    Food Science and Technology Program, Department of Chemistry, National University of Singapore, Singapore 117543, Singapore
    J Agric Food Chem 53:1841-56. 2005
    ..To comprehensively study different aspects of antioxidants, validated and specific assays are needed in addition to these two commonly accepted assays...
  47. ncbi Standardized methods for the determination of antioxidant capacity and phenolics in foods and dietary supplements
    Ronald L Prior
    U S Department of Agriculture, Arkansas Children s Nutrition Center, 1120 Marshall Street, Little Rock, Arkansas 72202, USA
    J Agric Food Chem 53:4290-302. 2005
    ..The TEAC assay represents a second ET-based method. Other assays may need to be considered in the future as more is learned about some of the other radical sources and their importance to human biology...
  48. ncbi Antioxidant capacity of some herbs/spices from cameroon: a comparative study of two methods
    Gabriel A Agbor
    Department of Chemistry, University of Scranton, Scranton, Pennsylvania 18510, USA
    J Agric Food Chem 53:6819-24. 2005
    ..Thus, the antioxidant capacity of plant samples determined by different methods should be interpreted with caution. However, irrespective of the assay method used, the samples were rich in antioxidants...
  49. ncbi Photocatalytic reduction and recovery of mercury by polyoxometalates
    E Gkika
    Institute of Physical Chemistry, NCSR Demokritos, 153 10 Athens, Greece
    Environ Sci Technol 39:4242-8. 2005
    ....
  50. ncbi Different methods of finishing and polishing enamel
    Eunice Teresinha Giampaolo
    Department of Removable Prosthodontics, Araraquara Dental School, Sao Paulo State University UNESP, Araraquara, Sao Paulo, Brazil
    J Prosthet Dent 89:135-40. 2003
    ..There is little evidence to support the assumption that this tooth modification will provide accurate adaptation of the framework and prevent build-up of plaque...
  51. ncbi Asymmetrical polar modification of a bivanadium-capped Keggin POM by multiple Cu-N coordination polymeric chains
    Jing Quan Sha
    Key Laboratory of Polyoxometalate Science of Ministry of Education, Faculty of Chemistry, Northeast Normal University, Changchun, Jilin, PR China
    Inorg Chem 46:11183-9. 2007
    ..Cu(bpe)].[H2bpe].H2O (2) (bpe = bis(4-pyridyl)ethylene), has been obtained, in which the {AsMo12O40(VO)2} sections are modified by double monotrack {Cu(bpe)}n coordination polymeric chains to form a "rail-like" 1D structure...
  52. pmc Molybdenum cofactor requirement for biotin sulfoxide reduction in Escherichia coli
    A del Campillo-Campbell
    J Bacteriol 149:469-78. 1982
    ....
  53. ncbi A selenium-dependent and a selenium-independent formylmethanofuran dehydrogenase and their transcriptional regulation in the hyperthermophilic Methanopyrus kandleri
    J A Vorholt
    Max Planck Institut für terrestrische Mikrobiologie und Laboratorium für Mikrobiologie des Fachbereichs Biologie der Philipps Universität, Marburg, Germany
    Mol Microbiol 23:1033-42. 1997
    ..They also indicate that the hyperthermophilic methanogen probably does not contain a molybdenum formylmethanofuran dehydrogenase which appears to be present only in thermophilic and mesophilic methanogens...
  54. ncbi Properties of the periplasmic nitrate reductases from Paracoccus pantotrophus and Escherichia coli after growth in tungsten-supplemented media
    Andrew J Gates
    School of Cell and Molecular Biosciences, The Medical School, University of Newcastle, Newcastle upon Tyne NE2 4HH, UK
    FEMS Microbiol Lett 220:261-9. 2003
    ..coli NapA. The combined data show that tungsten can function at the active site of some, but not all, molybdoenzymes from mesophilic bacteria...
  55. ncbi Merits of polyoxotungstates as environmental remediation catalysts: a novel wet oxidation technology for refractory industrial pollutants
    I Arslan Alaton
    Department of Environmental Engineering, Istanbul Technical University, Maslak, Istanbul, Turkey
    J Environ Sci Health A Tox Hazard Subst Environ Eng 38:2435-45. 2003
    ..Product distribution analysis suggested that the oxidation paths for catalyzed and uncatalyzed wet air oxidation of nitrobenzene are similar, but the analysis was not definitive...
  56. ncbi The tungsten-containing formate dehydrogenase from Methylobacterium extorquens AM1: purification and properties
    Markus Laukel
    Max Planck Institut fur terrestrische Mikrobiologie, Marburg, Germany
    Eur J Biochem 270:325-33. 2003
    ..The beta-subunit appears to be a fusion protein with its N-terminal domain related to NuoE-like subunits and its C-terminal domain related to NuoF-like subunits of known NADH-ubiquinone oxidoreductases...
  57. ncbi Determination of total polyphenolic content in red wines by means of the combined He-Ne laser optothermal window and Folin-Ciocalteu colorimetry assay
    Ottó Dóka
    Department of Physics, University of West Hungary, Mosonmagyaróvár
    Anal Chem 74:2157-61. 2002
    ..The precision, defined as the closeness to each other of 256 replicate readings of the OW signal, is generally better than 2%...
  58. ncbi Finishing and polishing of a hybrid composite and a heat-pressed glass ceramic
    M Jung
    Justus Liebig University, Dental Clinic, Department for Operative and Preventive Dentistry, Giessen, Germany
    Oper Dent 27:175-83. 2002
    ..SEM evaluation largely confirmed the quantitative results. Composite specimens exhibited signs of selective resin matrix removal when the Ceramiste system or the Politip system were used...
  59. ncbi Surface geometry of three packable and one hybrid composite after polishing
    Martin Jung
    Policlinic for Operative and Preventive Dentistry, Justus Liebig University, Giessen, Germany
    Oper Dent 28:816-24. 2003
    ..The polishing quality of the one-step systems SuperBuff and Diafix-oral was strongly affected by the initial finishing protocol...
  60. ncbi Finishing and polishing of indirect composite and ceramic inlays in-vivo: occlusal surfaces
    M Jung
    Dental Clinic, Policlinic for Operative and Preventive Dentistry, Justus Liebig University, Giessen, Germany
    Oper Dent 29:131-41. 2004
    ..5%-77.3%). Overall, no significant differences were detectable between the methods for finishing and polishing composite inlays and the methods applied to ceramic restorations with respect to roundness of contours and surface roughness...
  61. ncbi Iatrogenic tooth abrasion comparisons among composite materials and finishing techniques
    Christina A Mitchell
    The Oral Healthcare Research Centre, School of Clinical Dentistry, Queen s University, Royal Victoria Hospital, Belfast, United Kingdom
    J Prosthet Dent 88:320-8. 2002
    ..Whether use of these instruments causes undesirable iatrogenic abrasion of either the tooth surface or the composite restorative material is unknown. Assuming that damage occurs, which technique is least damaging is unknown...
  62. ncbi Finishing tooth-colored restorations in vitro: an index of surface alteration and finish-line destruction
    Patrick R Schmidlin
    Department of Preventive Dentistry, Periodontology and Cariology, Center for Dental and Oral Medicine, University of Zurich, Zurich, Switzerland
    Oper Dent 29:80-6. 2004
    ..The index values developed will prove helpful in evaluating and selecting appropriate instruments...
  63. ncbi Surface geometry of three packable and one hybrid composite after finishing
    Martin Jung
    Policlinic for Operative and Preventive Dentistry, Justus Liebig University, Giessen, Germany
    Oper Dent 28:53-9. 2003
    ..001 except for Sure-Fil). With scanning electron microscopy, surface areas with signs of destruction were found after using a 30 microm diamond on Definite specimens...
  64. ncbi Abrasive wear of resin composites as related to finishing and polishing procedures
    Cecilia P Turssi
    Division of Biomaterials and Biomechanics, School of Dentistry, Oregon Health and Sciences University, 611 SW Campus Drive, Portland, OR 97239, USA
    Dent Mater 21:641-8. 2005
    ....
  65. ncbi Effect of bur type on microtensile bond strengths of self-etching systems to human dentin
    Walter R L Dias
    Department of Operative Dentistry, School of Dentistry, University of North Carolina, Chapel Hill, NC 27599 7450, USA
    J Adhes Dent 6:195-203. 2004
    ..The null hypothesis was that different cavity preparation instruments do not affect adhesion of resin adhesives...
  66. ncbi A pilot investigation of enamel reduction procedures
    P Emile Rossouw
    Baylor College of Dentistry, Dallas, Texas 75246, USA
    J Can Dent Assoc 69:384-8. 2003
    ..To test and describe the use of various combinations of mechanical and chemical techniques for enamel reduction to obtain a smooth surface...
  67. ncbi Surface roughness and wettability of enamel and dentine surfaces prepared with different dental burs
    W M Al-Omari
    Jordan University of Science and Technology, Department of Restorative Dentistry, Irbid, Jordan
    J Oral Rehabil 28:645-50. 2001
    ..It was concluded that the surface roughness of enamel and dentine prepared by different rotary instruments had no significant influence on the wettability of distilled water on these surfaces...
  68. ncbi Enamel surface roughness following debonding using two resin grinding methods
    Theodore Eliades
    Biomaterials Laboratory, Section of Basic Sciences and Oral Biology, School of Dentistry, University of Athens, Greece
    Eur J Orthod 26:333-8. 2004
    ..The increase in most roughness variables induced by the debonding procedures was not reversed at the end of the finishing stage, regardless of the resin removal protocol used, suggesting an irreversible effect on enamel texture...
  69. ncbi Surface texture of resin-modified glass ionomer cements: effects of finishing/polishing systems
    Adrian U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore
    Oper Dent 27:381-6. 2002
    ..The use of carbides (RC) and one-step rubber abrasive system (OG) for finishing/polishing of RMGICs is not recommended. Graded abrasive disk (SS) or two-step rubber abrasive (CS) systems should be used instead...
  70. ncbi New carbide finishing burs to reduce polishing efforts of light-cured restorations
    Ralf J Radlanski
    Department of Experimental Dentistry, Charité Campus Benjamin Franklin at Freie University Berlin, Germany
    Quintessence Int 38:e555-63. 2007
    ..To compare, under laboratory conditions, the efficacy of different polishing systems for various light-curing restorative materials...
  71. ncbi Restoration by sllicotungstic acid of DCMU-inhibited photoreactions in spinach chloroplasts
    G Girault
    , Service de Biophysique, , B.P. No. 2-91 190 Gif-sur-Yvette, France
    Biochim Biophys Acta 333:314-9. 1974
    ..More likely in its presence the properties of the membrane change and ferricyanide can accept electrons from a part of the electron transport chain, between the Photosystem II reaction center and the block of the electron flow by DCMU...
  72. ncbi Identification and characterization of the cytoplasmic tungstate/molybdate-binding protein (Mop) from Eubacterium acidaminophilum
    Kathrin Makdessi
    Institut fur Mikrobiologie, Martin Luther Universitat Halle Wittenberg, Kurt Mothes Strasse 3, 06120 Halle, Germany
    Arch Microbiol 181:45-51. 2004
    ..Mutational analysis revealed that the positive charge of the Arg-6, located in the conserved SARN region of Mop, was not directly involved in oxyanion binding...
  73. ncbi Characterisation of the molybdenum-responsive ModE regulatory protein and its binding to the promoter region of the modABCD (molybdenum transport) operon of Escherichia coli
    L A Anderson
    Department of Biochemistry, Medical Sciences Institute, University of Dundee, UK
    Eur J Biochem 246:119-26. 1997
    ..This region contains a 6-base palindromic sequence CGTTAT-N12-ATAACG...
  74. ncbi Reversible precipitation of bovine serum albumin by metal ions and synthesis, structure and reactivity of new tetrathiometallate chelating agents
    Victoria E Lee
    Chemistry Department, Princeton University, Princeton, NJ, USA
    J Inorg Biochem 101:1707-18. 2007
    ..The slower hydrolysis of tetrathiotungstate may make it more useful as an inorganic reagent and therapeutic agent...
  75. ncbi Human 3'-phosphoadenosine 5'-phosphosulfate synthetase (isoform 1, brain): kinetic properties of the adenosine triphosphate sulfurylase and adenosine 5'-phosphosulfate kinase domains
    Eric B Lansdon
    Department of Chemistry and Section of Molecular and Cellular Biology, University of California, One Shields Avenue, Davis, California 95616, USA
    Biochemistry 43:4356-65. 2004
    ..Chlorate and perchlorate form dead-end E.MgATP.oxyanion complexes. Phenylalanine, reported to be an inhibitor of brain ATP sulfurylase, was without effect on PAPS synthetase isoform 1...
  76. ncbi Tungstate Uptake by a highly specific ABC transporter in Eubacterium acidaminophilum
    K Makdessi
    , , Kurt-Mothes-Strasse 3, 06120 Halle, Germany
    J Biol Chem 276:24557-64. 2001
    ..They should participate in the biosynthesis of the pterin cofactor that is present in molybdenum- and tungsten-containing enzymes except nitrogenase...
  77. pmc Tungsten transport protein A (WtpA) in Pyrococcus furiosus: the first member of a new class of tungstate and molybdate transporters
    Loes E Bevers
    Department of Biotechnology, Delft University of Technology, Julianalaan 67, 2628 BC Delft, The Netherlands
    J Bacteriol 188:6498-505. 2006
    ..A displacement titration of molybdate-saturated WtpA with tungstate showed that the tungstate effectively replaced the molybdate in the binding site of the protein...
  78. ncbi Antitumor and antiinflammatory effects of tetrathiotungstate in comparison with tetrathiomolybdate
    Guoqing Hou
    Department of Human Genetics, University of Michigan Medical School, Ann Arbor, MI 48019 0534, USA
    Transl Res 149:260-4. 2007
    ..It was found that the 2 drugs were comparable in their effects when doses were used that lowered copper availability to the same extent...
  79. ncbi Enhancing effect of calcium and vanadium ions on thermal stability of bromoperoxidase from Corallina pilulifera
    Esther Garcia-Rodriguez
    Henry Wellcome Building for Biocatalysis, School of Biological and Chemical Sciences, University of Exeter, Exeter, EX4 4QD, UK
    J Biol Inorg Chem 10:275-82. 2005
    ..The high stability of the enzyme in the presence of organic solvents is useful for its application as a biocatalyst...
  80. ncbi Inhibition of bacteriophage lambda protein phosphatase by organic and oxoanion inhibitors
    Nicholas J Reiter
    Section of Hematology Research and Department of Biochemistry and Molecular Biology, Mayo Clinic and Foundation, Rochester, Minnesota 55905, USA
    Biochemistry 41:1051-9. 2002
    ..These EPR and inhibition kinetic results are discussed in the context of establishing a common mechanism for the hydrolysis of phosphate esters by lambdaPP and other serine/threonine protein phosphatases...
  81. ncbi The periplasmic nitrate reductase from Escherichia coli: a heterodimeric molybdoprotein with a double-arginine signal sequence and an unusual leader peptide cleavage site
    G Thomas
    School of Biochemistry, University of Birmingham, UK
    FEMS Microbiol Lett 174:167-71. 1999
    ..Nap activity was suppressed during growth in the presence of tungstate and was absent from a mutant unable to synthesise the molybdopterin cofactor...
  82. ncbi Oxyanion binding alters conformation and quaternary structure of the c-terminal domain of the transcriptional regulator mode. Implications for molybdate-dependent regulation, signaling, storage, and transport
    D G Gourley
    Wellcome Trust Biocentre, University of Dundee, Dundee, DD1 5EH, United Kingdom
    J Biol Chem 276:20641-7. 2001
    ..Sequence and structure-based comparisons lead to a classification of molybdate-binding proteins...
  83. ncbi Influence of artificial gastric juice composition on bioaccessibility of cobalt- and tungsten-containing powders
    Aleksandr B Stefaniak
    National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Morgantown, WV 26505, USA
    Int J Hyg Environ Health 213:107-15. 2010
    ..Solvent composition appeared to influence bioaccessibility of the low soluble tungsten compounds, though differences may be due to variability in the data associated with the small masses of materials that ..
  84. ncbi Synthesis and structures of bis(dithiolene)tungsten(IV,VI) thiolate and selenolate complexes: approaches to the active sites of molybdenum and tungsten formate dehydrogenases
    Stanislav Groysman
    Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, USA
    Inorg Chem 46:4090-102. 2007
    ..The several [MoIV(QR)(S2C2Me2)2]- complexes prepared earlier and the tungsten compounds synthesized in this work form a family of molecules whose overall stereochemistry and metric features are ..
  85. ncbi Tungsten's redox potential is more temperature sensitive than that of molybdenum
    Alexander Döring
    Institut fur Anorganische Chemie, Georg August Universitat Gottingen, Tammannstrasse 4, 37077, Gottingen, Germany
    Dalton Trans 39:5623-9. 2010
    ..Each pair of molybdenum and tungsten compounds was studied under identical conditions...
  86. pmc Exposure assessment in the hard metal manufacturing industry with special regard to tungsten and its compounds
    T Kraus
    Institute and Outpatient Clinic for Occupational, Social and Environmental Medicine of the University of Erlangen Nürnberg, Schillerstrabetae 25 and 29, D 91054 Erlangen, Germany
    Occup Environ Med 58:631-4. 2001
    ..The main components of hard metals are tungsten carbide and cobalt metal. According to recent studies, these two components may be responsible for both fibrogenic and carcinogenic effects...
  87. ncbi Insulin mimetic effect of tungsten compounds on isolated rat adipocytes
    Aleksandra Topic
    Department of Medical Biochemistry, University of Belgrade, Serbia
    Biol Trace Elem Res 134:296-306. 2010
    ..It has been reported that tungsten compounds mimic the action of insulin in intact cell systems...
  88. ncbi Lacunary-substituted undecatungstosilicates sensitize methicillin-resistant Staphylococcus aureus to beta-lactams
    Y Tajima
    Clinical Laboratory, Saga Medical School Hospital, Nabeshima, Japan
    Biol Pharm Bull 24:1079-84. 2001
    ..This suggests that a charge interaction between the tungsten compounds and some unknown materials in the culture medium or bacterial cells plays an important role in the ..
  89. ncbi A modified acid digestion procedure for extraction of tungsten from soil
    A J Bednar
    U S Army Engineer Research and Development Center, Environmental Laboratory, 3909 Halls Ferry Rd, Vicksburg, MS 39180, United States
    Talanta 80:1257-63. 2010
    Interest in tungsten occurrence and geochemistry is increasing due to increased use of tungsten compounds and its unknown biochemical effects...
  90. ncbi Secondary spacer modulated assembly of polyoxometalate based metal-organic frameworks
    Jing Quan Sha
    Key Laboratory of Functional Inorganic Material Chemistry MOE, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, PR China
    Dalton Trans 42:1667-77. 2013
    ..Additionally, photocatalytic experiments of 1-5 for the photocatalytic degradation of RhB under UV irradiation were also investigated...
  91. ncbi Structural basis of trans-inhibition in a molybdate/tungstate ABC transporter
    Sabina Gerber
    Institute of Molecular Biology and Biophysics, ETH Zurich, HPK D14 3, 8093 Zurich, Switzerland
    Science 321:246-50. 2008
    ..This allosteric effect prevents the transporter from switching between the inward-facing and the outward-facing states, thus interfering with the alternating access and release mechanism...
  92. ncbi Modular assembly of a functional polyoxometalate-based open framework constructed from unsupported AgI--AgI interactions
    Carsten Streb
    WestCHEM, Department of Chemistry, The University of Glasgow, Glasgow, UK
    Angew Chem Int Ed Engl 46:7579-82. 2007
  93. ncbi Effect of different splint removal techniques on the surface roughness of human enamel: a three-dimensional optical profilometry analysis
    Zafer C Cehreli
    Department of Pediatric Dentistry, Faculty of Dentistry, Hacettepe University, Ankara, Turkey
    Dent Traumatol 24:177-82. 2008
    ..05). Overall, the smoothest enamel surface was obtained after removal of resin with Sof-Lex disks and the 16-blade tungsten carbide bur (P < 0.05)...
  94. ncbi Tungsten affects the cortical microtubules of Pisum sativum root cells: experiments on tungsten-molybdenum antagonism
    I D S Adamakis
    Department of Botany, School of Biology, Aristotle University of Thessaloniki, Thessaloniki, Greece
    Plant Biol (Stuttg) 12:114-24. 2010
    ..The results indicate that cortical microtubules of plant cells are indirectly affected by W, most probably through a mechanism depending on the in vivo antagonism of W for the Mo-binding site of Cnx1 protein...
  95. ncbi Photoassisted and photocatalytic degradation of sulfur mustard using TiO2 nanoparticles and polyoxometalates
    Mohammad Taghi Naseri
    Defense Chemical Research Laboratory, Karaj, Iran
    Environ Sci Pollut Res Int 20:907-16. 2013
    ..TiO(2) nanoparticles proved to be a superior photocatalyst under UV irradiation for HD decontamination...
  96. pmc Novel inducers of the envelope stress response BaeSR in Salmonella Typhimurium: BaeR is critically required for tungstate waste disposal
    Corinne Appia-Ayme
    School of Biological Sciences, University of East Anglia, Norwich Research Park, Norwich, United Kingdom
    PLoS ONE 6:e23713. 2011
    ..BaeR is therefore either required for survival in larger mammals such as pigs or calves, an avian host such as chickens, or survival out with the host altogether where Salmonella and related enterics must survive in soil and water...
  97. ncbi Hybrid assemblies based on a gadolinium-containing polyoxometalate and a cationic polymer with spermine side chains for enhanced MRI contrast agents
    Wenqiang Chai
    Institute of Physical Chemistry, University of Mainz, Jakob Welder Weg 11, 55099 Mainz Germany
    Chemistry 19:13317-21. 2013
    ..The T1-weighted MRI performance of GdW is enhanced about three times in the assemblies; meanwhile, the assemblies show good biocompatibility, which enables them to be promising candidates for MRI contrast agents...
  98. ncbi Crystal structure of an archaeal Rad51 homologue in complex with a metatungstate inhibitor
    Yang Li
    Department of Biochemistry, University of Saskatchewan, A3 Health Sciences Building, 107 Wiggins Road, Saskatoon, Saskatchewan, Canada S7N 5E5
    Biochemistry 48:6805-10. 2009
    ..The tungsten cluster binds RadA in the axial DNA-binding groove. This polyanionic species appears to inhibit RadA by locking the protein in its inactive conformation...
  99. ncbi Reversible redox-switchable second-order optical nonlinearity in polyoxometalate: a quantum chemical study of [PW11O39(ReN)]n- (n = 3-7)
    Wei Guan
    Institute of Functional Material Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun, P R China
    Inorg Chem 47:5245-52. 2008
    ..Therefore, these kinds of complexes with the facile and reversible redox states could become excellent switchable NLO materials...
  100. ncbi Enamel loss and adhesive remnants following bracket removal and various clean-up procedures in vitro
    Sacha Ryf
    Departments of Orthodontics and Dentofacial Orthopedics, Klinik für Kieferorthopädie der Universität Bern, Freiburgstrasse 7, Bern, Switzerland
    Eur J Orthod 34:25-32. 2012
    ..32 mm(3)). There were no statistically significant differences in volumetric changes after polishing (P = 0.054) between the different clean-up methods. However, sufficient clean-up without enamel loss was difficult to achieve...
  101. ncbi Effect of carbon nanohorns on nanofriction and wear reduction in dry and liquid environments
    Dave Maharaj
    Nanoprobe Laboratory for Bio and Nanotechnology and Biomimetics NLBB, The Ohio State University, Columbus, OH 43210 1142, USA
    J Colloid Interface Sci 400:147-60. 2013
    ..Results indicate CNH nanoparticles contribute to friction and wear reduction due to the reduced contact area and low meniscus force contribution...

Research Grants1

  1. Metals in exhaled breath condensate as COPD biomarkers
    Antonio Mutti; Fiscal Year: 2005
    ..abstract_text> ..