A practical and green method for the synthesis of 5H-dibenzo[b,i]xanthene-tetraones and spiro[dibenzo[b,i]xanthene-13,3'-indoline]-pentaones by the condensation of 2-hydroxynaphthalene-1,4-dione with aldehydes or isatins, respectively, in the presence of a catalytic amount of cellulose sulfuric acid (CSA) under solvent-free conditions at 100 °C is described. The significant features of this pro...

Serum opsonic capacity against B. pertussis was studied by using quantitative chemiluminescence (CL), a method known to have several advantages over conventional methods in evaluating opsonization and phagocytosis. Sera from unvaccinated infants was shown not to contain opsonins against B. pertussis and in unvaccinated infants suffering from whooping cough, no opsonins were detected. In ad...

Consider the following consistent Sylvester tensor equation[mathscr{X}times_1 A +mathscr{X}times_2 B+mathscr{X}times_3 C=mathscr{D},]where the matrices $A,B, C$ and the tensor $mathscr{D}$ are given and $mathscr{X}$ is the unknown tensor. The current paper concerns with examining a simple and neat framework for accelerating the speed of convergence of the gradient-based iterative algorithm and ...

Acenaphtho derivatives have been reported as antitumor agents. So, the reaction of acenaphthylene-1,2-dione with 3,4-diaminobenzenethiol, and then with the alkyl chloride derivatives for the synthesis of acenaphtho [1,2-b] quinoxalines are reviewed. Excellent yields of the products, short reaction times and simple work-up are attractive features of this suitable protocol.