a mild and green method has been developed for the preparation of coumarins derivatives through the one-pot reactions. in our study,various phenols and ethyl acetoacetate compound in which we used silica-supported boron sulfonic acid [sio2/b(so4h)3] as a new, highly efficient and tri-functional inorganic brønsted acid catalyst were processed under solvent-free condition and thermal. the catalys...

The effect of the presence an anodic film and hybrid sol-gel coating loaded with corrosion inhibitors was evaluated as a strategy for enhanced barrier active protection aluminium alloy 2024-T3. In this study, AA2024-T3 specimens were anodized in modified sulphuric-citric acid bath (SCA) first layer protective multilayer system subsequently protected by application silica-based coatings. These c...

antiviral proteins (avp), present in silkworm fecal matter, show activity against nuclear polyhedrosis virus (npv) in vitro and in vivo. the extract of silkworm fecal matter prepared in phosphate buffer solution of ph 7.5 was subjected to 50% solid ammonium sulfate precipitation to enrich avp, then which was dialyzed. the dialysate was applied to the column containing silica gel-g, the column e...