SeO2 and As2O3 were reacted at 200 °C in a potassium hydroxide hydroflux with molar water-base ratio n(H2O) : n(KOH)=1.8. Arsenate(III) disproportionates under these conditions into arsenate(V) elemental arsenic. The reduction also yielded tetraselenodiarsenate(II) anions, which turned the solution yellow precipitated room temperature as plate-shaped crystals of K4(As2Se4) ⋅ 2H2O. unexpected re...

alkaline phosphatase (ortho phosphate, monoester hydrolase phosphoinositide e. c. 3.1.3.1) is a non-specific metalloproteinase enzyme that is located inside periplasmic space of bacteria. this enzyme is used to measure freshwater sediment in genetic engineering for cleaning water. isolation and molecular identification of the bacteria producing alkaline phosphatase and comparison of its product...

Formation of inclusion complexes of monochlorotriazinyl-β-cyclodextrin with promethazine was studied, for establishing the optimal conditions of their formation, in view of subsequent grafting on cellulose textiles with potential medicinal use. The infrared spectral study of inclusion in solid state indicated that the complex can be even formed by physically mixing the two substances. By the co...

Chitosan was cross-linked using glutaraldehyde in the presence of magnetite. The resin obtained was chemically modified through the reaction with tetraethylenepentamine followed by glycidyl trimethylammonium chlorid to produce chitosan bearing amine (R1) and chitosan bearing both amine and quaternary ammonium chloride moieties (R2), respectively. The quaternary amine resin (R2) showed a higher ...

In this study, Bacillus licheniformis cells were immobilized by entrapment in calcium alginate beads and were used for production of alkaline protease by repeated batch process. In order to increase the stability of the beads, the immobilization procedure was optimized by statistical full factorial method, by which three factors including alginate type, calcium chloride concentration, and agita...

Many tissues contain enzymes which will hydrolyse the organic phosphorus compounds to give free phosphoric acid. These enzymes are known as phosphatases. Some of these phosphatases are most active in an alkaline medium and the others in an acid medium. The phosphatase of bone (Yamane, 1931), bile (King and Armstrong, 1934) and white blood cells (Roche, 1931) are alkaline phosphatases, while tho...