Both polymorphs of sapphirine, namely sapphirine-l Tc and sapphirine-2M, were found in granulites near Wilson Lake (Labrador). Both minerals can be described as consisting of equivalent layers with monoclinic symmetry, translation periods a :=: 9.78, c :=: 9.93A, with f3 :=: 110.2°, the width of a layer being b., :=: 7.20 A. The layers are built up by octahedral walls connected by tetrahedral c...

A selective oxidation of primary alcohols to the corresponding aldehydes by shaking with chromium trioxide supported on aluminium silicate at room temperature under solvent free conditions is reported. This new procedure can also oxidise secondary alcohols.

A number of oral preparations of various forms of silicon were fed to young adult Beagle dogs and young rats of both sexes for a period of four weeks. During the test period the animals were observed for clinical symptoms and urine and blood measurements were made. At the end of the experimental period all animals were sacrificed and subjected to a complete necropsy and histopathologic study. P...

People have the opportunity to inhale inorganic dusts under various environments. Inorganic dust exposures as a result of occupational exposure may induce or modulate pulmonary fibrosis. We analyzed the deposition of elements in lung tissues of patients with idiopathic pulmonary fibrosis (IPF) and compared element deposition with chronic hypersensitivity pneumonitis (chronic HP) and collagen va...

A combined quantummechanical and thermodynamic approach to the mechanical properties of multicomponent silicate glasses is presented. Quantum chemical calculations based on density functional theory on various silicate systems were performed to explore the crystalline polymorphs existing for a given chemical composition. These calculations reproduced the properties of known polymorphs even in s...

A comparison of different approaches of the formation and evolution of sub-colloidal precursor species during crystallization of MFI-type zeolites showed that, although the formation of sub-colloidal precursor species is almost the same in both homogeneous [initially clear (alumino)silicate solutions] and heterogeneous [(alumino)silicate hydrogels], their further evolution strongly depends on t...

Lamotrigine is a substituted asymmetric triazine. It is a white to pale cream-coloured powder. It is slightly soluble in ethanol and chloroform, and very slightly soluble in water. The pKa of lamotrigine at 25°C is 5.7. Each Lamictal Dispersible/Chewable tablet also contains calcium carbonate, hydroxypropyl cellulose, aluminium magnesium silicate, sodium starch glycollate, povidone, saccharin s...

Abstract Tricalcium oxy silicate (C 3 S) and dicalcium 2 are the major constituents of cement. In this study, reactivity polymorphs calcium silicates is quantitatively investigated using Density Functional Theory. The result combining DFT calculation Bader charge analysis elucidates that main difference in between C S presence ions which has smaller partial compared to other oxygen crystals. Fo...

Polymer-layered silicate nanocomposites belong to a new class of hybrid materials consisting of organic-synthetic polymer matrix and inorganic filler-layered structure clay minerals. The paper presents the results of FTIR, NMR, and SAXS studies of poly(ε-caprolactone)/sodium montmorillonite nanocomposites. We observed a correlation between the concentration of poly(ε-caprolactone) in nanocompos...