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Molybdenum and tungsten enzymes: the xanthine oxidase family.

Molybdenum and tungsten enzymes: the xanthine oxidase family.

Current opinion in chemical biology (2006-02-17)

Carlos D Brondino, Maria João Romão, Isabel Moura, José J G Moura

摘要

Mononuclear molybdenum and tungsten are found in the active site of a diverse group of enzymes that, in general, catalyze oxygen atom transfer reactions. Enzymes of the xanthine oxidase family are the best-characterized mononuclear Mo-containing enzymes. Several 3D structures of diverse members of this family are known. Recently, the structures of substrate-bound and arsenite-inhibited forms of two members of this family have also been reported. In addition, spectroscopic studies have been utilized to elucidate fine details that complement the structural information. Altogether, these studies have provided an important amount of information on the characteristics of the active site and the electron transfer pathways.

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钨, powder, 12 μm, 99.9% trace metals basis

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钨, powder, ≤10 μm, ≥99.99% trace metals basis

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钨, powder (monocrystalline), 0.6-1 μm, ≥99.9% trace metals basis

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钨, wire, diam. 0.25 mm, ≥99.9% trace metals basis

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钨, wire, diam. 1.0 mm, 99.99% trace metals basis

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钨, foil, thickness 0.25 mm, ≥99.9% trace metals basis

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钨, wire, diam. 0.5 mm, ≥99.9% trace metals basis

Sigma-Aldrich

钨, foil, thickness 0.5 mm, ≥99.9% trace metals basis

钨, mesh, 100x100mm, nominal aperture 0.2mm, wire diameter 0.05mm, 100 wires/inch, open area 64%, plain weave mesh, 99.95%

Sigma-Aldrich

钨, foil, thickness 0.127 mm, ≥99.9% trace metals basis

钨, foil, 100x100mm, thickness 0.125mm, as rolled, 99.95%

钨, mesh, 50x50mm, nominal aperture 0.2mm, wire diameter 0.05mm, 100 wires/inch, open area 64%, plain weave mesh, 99.95%

钨, lump, 100g, max. size 5mm

钨, rod, 100mm, diameter 6.35mm, centerless ground, 99.95%

钨, wire, straight, 500mm, diameter 0.5mm, 99.9+%

钨, lump, 200g, max. size 5mm

钨, foil, 50x50mm, thickness 0.15mm, as rolled, 99.95%

钨, mesh, 50x50mm, nominal aperture 0.15mm, wire diameter 0.02mm, 150 wires/inch, open area 75%, plain weave mesh, 99.95%

钨, rod, 100mm, diameter 3.0mm, centerless ground, 99.95%

钨, insulated wire, 10m, conductor diameter 0.025mm, insulation thickness 0.005mm, polyimide insulation, 99.9%

钨, foil, not light tested, 25x25mm, thickness 0.003mm, 99.95%

钨, wire, straight, 300mm, diameter 0.38mm, 99.9+%

钨, foil, 50x50mm, thickness 0.5mm, as rolled, 99.95%

钨, wire reel, 5m, diameter 0.1mm, gold plated, 99.95%

钨, wire reel, 25m, diameter 0.25mm, clean, 99.95%

钨, rod, 500mm, diameter 10.0mm, centerless ground, 99.95%

钨, wire reel, 10m, diameter 0.02mm, gold plated, 99.95%

钨, wire reel, 25m, diameter 0.05mm, clean, 99.95%

钨, wire reel, 50m, diameter 0.005mm, gold plated, 99.95%

钨, foil, 150x150mm, thickness 0.15mm, as rolled, 99.95%