The formation mechanism of amorphous tantalum oxides was studied by total scattering experiments starting from alkoxide precursors. Hydrolysed TaxOyHz clusters form in highly dilute solutions which were transformed into L-Ta2O5 calcination.

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evaluation of magnesium levels in serum and cerebrospinal fluid of patients with febrile convulsion (fc) hospitalized in bahrami hospital in tehran in 2010-2011. in the past, decreased levels of magnesium in serum and csf of patients with fc were reported. the purpose of this study was to identify the possible role of magnesium in febrile seizures in children. identifying this condition, we may...

An all-aqueous sol-gel method for encapsulation of bacterial cells in porous silicate matrices towards the development of a biosensor is described. The sol-gel encapsulation of cells is achieved at room temperature and neutral pH. Furthermore, use of sodium silicate as precursor avoids generation of alcohol that can be detrimental to cells in contrast to the traditional alkoxide sol-gel encapsu...

Introduction Material surfaces composed of glass, metal oxide or potentially any oxide/hydroxide functional group are routinely tailored using organosilane reagents, affording new physico-chemical surface properties and enabling diverse application. The classic modification is based upon a hydrolysiscondensation mechanism. Reagent of the type YSiX3 (Y= terminally functionalized alkyl; X= alkoxi...

Phase-pure, ultrafine nanocrystalline anatase with high specific surface area (up to 250 m(2) g(-1)) was obtained upon injection of a titanium alkoxide precursor into ethanol with designed volume of water under mild solvothermal conditions (<200 degrees C, 2 h). Primary particle sizes were tuned by adjusting various reaction parameters, with the smallest grain sizes occurring at low temperature...

Among the fundamental transformations that comprise a catalytic cycle for cross coupling, transmetalation from the nucleophile to the metal catalyst is perhaps the least understood. Optimizing this elementary step has enabled the first example of a cobalt-catalyzed Suzuki-Miyaura cross coupling between aryl triflate electrophiles and heteroaryl boron nucleophiles. Key to this discovery was the ...

1. In eight patients being treated by chronic dialysis the relation of magnesium metabolism to the magnesium concentration of the dialysate was investigated. During four periods of 2-6 weeks the magnesium concentrations of the dialysis fluid were 0'44±0'15 mg/IOO ml, 0'70±0'24 mg/IOO ml, 1'83±0'18 mg/IOO ml and 1'97±0'21 mg/IOO ml. 2. During all periods the concentration of plasma magnesium and...