ABSTRACT Biological leaching is a process in which metals are dissolved from sulfide ores into aqueous solutions using bacteria as catalysts. Biological leaching is currently gaining acceptance as a viable alternative to ...

Abstract. A simple and very efficient synthesis of quinophthalones has been achieved with using of phthalic anhydride and 2-methylquinoline derivatives as starting materials and BF3/Et2O as catalyst under solvent-free and ...

Abstract An efficient route for the synthesis of 3-substituted coumarins via Knoevenagel condensation using ZrOCl2.8H2O (10 mol %) as the catalyst under microwave heating and solvent-free conditions is described. This ...

Abstract Data acquisition of chemical engineering processes is expensive and the collected data are always contaminated with inevitable measurement errors. Efficient algorithms are required to filter out the noise and ...

ABSTRACT The central composite design (CCD) technique, a response surface methodology (RSM), was used to study the effect of the withering time and the fermentation conditions of the tea leaves on the black tea quality ...

Abstract-A two-component condensation reaction between an electron-poor acetylenic ester and a phenol efficiently provides substituted aryl vinyl ethers in a one-pot reaction in the presence of dipotassium hydrogen phosphate ...

Abstract The study of non-catalyzed molecular reaction of reducing sugars by spectrophotometry technique at different concentration of sugars, iodine and temperature has investigated first time. The absence of salt ...