Phosphonoacetaldehyde hydrolase (phosphonatase) catalyzes the hydrolysis of phosphonoacetaldehyde to acetaldehyde and phosphate using Mg(II) as cofactor. The reaction proceeds via a novel bicovalent catalytic mechanism in which an active-site nucleophile abstracts the phosphoryl group from the Schiff-base intermediate formed from Lys53 and phosphonoacetaldehyde. In this study, the X-ray crystal...

In this paper, we suggest a novel recycling process for hard metal sludge that does not use ammonium paratungstate. Ammonia, which in the conventional is essential removing sodium and crystallized tungstate, was used process. Instead of ammonia, acid to remove tungstate resulting formation tungstic (H2WO4). Tungsten powders were successfully synthesized by hydrogen reduction through H2O decompo...

Heavy metal tungsten alloys have replaced lead and depleted uranium in many munitions applications, due to public perception of these elements as environmentally unsafe. Tungsten materials left in the environment may become bioaccessible as tungstate, which might lead to population exposure through water and soil contamination. Although tungsten had been considered a relatively inert and toxico...

BACKGROUND AND AIMS Root growth and development are closely dependent upon nitrate supply in the growth medium. To unravel the mechanism underlying dependence of root growth on nitrate, an examination was made of whether endogenous nitric oxide (NO) is involved in nitrate-dependent growth of primary roots in maize. METHODS Maize seedlings grown in varying concentrations of nitrate for 7 d wer...

The Raman spectra of seven A(2)MWO(6) tungstate double perovskites are analysed. Ba(2)MgWO(6) is a cubic double perovskite with Fm3[combining macron]m symmetry and its Raman spectrum contain three modes that can be assigned in a straightforward manner. A fourth mode, the asymmetric stretch of the [WO(6)](6-) octahedron, is too weak to be observed. The symmetry of Ba(2)CaWO(6) is lowered to tetr...

An overview is given of the Lead Tungstate (PbWO4) electromagnetic crystal calorimeter for the CMS detector at the Large Hadron Collider (LHC) at CERN in Geneva. This includes a description of the engineering design, the development of the calorimeter components, the read-out system and results obtained in particle beams. Presented at IEEE Nuclear Science Symposium, Toronto, Canada, November 19...

Herein we report the synthesis of α-Dawson type POM, Li6[α-P2W18O62]·28H2O, directly from the use of Li2WO4 as the tungstate source. The salt obtained was soluble not only in water but also in a range of polar and non-polar organic solvents, such as benzene.