Soybean (Glycine max [L.] Merr.) seeds were imbibed and germinated with or without NO(3) (-), tungstate, and norflurazon (San 9789). Norflurazon is a herbicide which causes photobleaching of chlorophyll by inhibiting carotenoid synthesis and which impairs normal chloroplast development. After 3 days in the dark, seedlings were placed in white light to induce extractable nitrate reductase activi...

Pyrobaculum aerophilum, a hyperthermophilic archaeon, can respire either with low amounts of oxygen or anaerobically with nitrate as the electron acceptor. Under anaerobic growth conditions, nitrate is reduced via the denitrification pathway to molecular nitrogen. This study demonstrates that P. aerophilum requires the metal oxyanion WO42- for its anaerobic growth on yeast extract, peptone, and...

In this work, we present a new photochromic tungstate based glass which have both absorption coefficient and refractive index modified under laser exposure. The photosensitive effect is superficial under ultraviolet (UV) irradiation but occurs in the entire volume of the glass under visible irradiation. The effect can be obtained in any specific point inside the volume using an infrared femtose...

Trimorphous temperature-dependent polymorphism (I: above 591°C, II: 589-591°C, III: below 589°C) was confirmed for sodium tungstate Na2WO4 using DSC and temperature-programmed powder XRD. Na2WO4-I crystallises in space group Fddd (no. 70, a=650.28(1), b=1285.12(3), c=1105.26(2) pm, 63 rparam., RBragg = 0.008), Na2WO4-II a unit cell is suggested. Moreover, the crystal structure of new triclinic ...

In this paper, we employed plasma electrolytic oxidation (PEO) of aluminum in a water solution sodium tungstate (Na2WO4?2H2O) with the addition pure and Ce-loaded zeolites clinoptilolite 13 X for preparation oxide coatings. The obtained coatings were characterized respect to their morphologies chemical phase compositions using scanning electron microscopy coupled energy-dispersive X-ray spectro...

The TupABC system is involved in the cellular uptake of tungsten and belongs to the ABC (ATP binding cassette)-type transporter systems. The TupA component is a periplasmic protein that binds tungstate anions, which are then transported through the membrane by the TupB component using ATP hydrolysis as the energy source (the reaction catalyzed by the ModC component). We report the heterologous ...