J o a c h i m F u c h s u n d E r n s t P e t e r F l i n d t Institut für Anorganische Chemie der Freien Universität Berlin Z . Naturforsch. 34b, 412 -422 (1979); eingegangen am 28. November 1978 Properties, X r a y , Heptatungstate , Paratungstate A , Metatungstate Polytungstates are obtained b y the reaction of hydrated tungsten (VI) oxide with bases or salts after occasional addition of org...

Tungsten oxide (WO3) nanostructure were synthesized by a facile hydrothermal method at 150° C using tungstate dehydrates (Na2WO4.2H2O) as the precursor. Without any additive, scanning electron microscopy revealed a rhombus shaped WO3 nanostructures while with the addition of sodium chloride, the morphology changes to nano-dagger bundles that formed flower-like structure. Furthermore, the size o...

AIMS Tungstate reduces blood pressure in experimental animal models of both hypertension and metabolic syndrome, although the underlying mechanisms are not fully understood. Given that the large-conductance voltage- and Ca(2+)-dependent K(+) (BK) channel is a key element in the control of arterial tone, our aim was to evaluate whether BK channel modulation by tungstate can contribute to its ant...

In the present study, a simple, rapid and sensitive method was developed for the determination of mercury concentrations in the muscle tissue of fish from the Brazilian Amazon using graphite furnace atomic absorption spectrometry (GFAAS) following acid mineralization of the samples in an ultrasonic cold water bath. Using copper nitrate as a chemical modifier in solution and sodium tungstate as ...

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...

In this paper, we present results of a study on Sb doping in lead tungstate crystals. The crystal growth by modified Bridgman method is described. The segregation coefficient of Sb ions in lead tungstate crystals was determined. The scintillation emission and longitudinal transmittance spectra, light output, decay kinetics and radiation damage were measured. It is found that Sb doping alone is ...

Activation of the large conductance, Ca2+-dependent K+ channel [KCa1.1+b-subunits, generally known as the Big K (BK) or maxi K channel] is an important negative feedback on depolarization and Ca2+-induced contraction of smooth muscle and thus arterial vasoconstriction (Figure 1). Intriguingly, altered function of BK and/or polymorphism in human BK aand b-subunit genes have been associated with ...