a green and efficient one-pot, four-component synthesis of 6-amino-4-aryl-3-methyl-2,4-dihydropyrano[2,3- c ]pyrazo-carbonitrile derivatives catalyzed by borax in water is described. this method provides several advantages such as environmental friendliness, shorter reaction time, excellent yields, and simple workup procedure. the in vitro cytotoxic activity of the synthesized test compounds wa...

An HPLC-DAD method was developed for the determination of formaldehyde in animal feed and silage. The is based on product chemical reaction between 2,4-dinitrophenylhydrazine. A 3 g or silage were extracted with Milli-Q water phosphoric acid next derivative use 2,4-dinitrophenyl- hydrazine acetronitrile solution. extract purified 0.45 µm syringe filters separeted Zorbax Eclipse XDB C18 column d...

Digital filters are used for identification, prediction, and modeling of hidden objects in dynamic systems. These Gaussian filter with power spectrum depth estimation, edge detection the as well constructed 2-D geomagnetic objects. In this paper, digital results obtained by MATLAB software. Magnetometer instrument is to collect aeromagnetic data Aeromagnetic collected from Aswan area Egypt. cod...

a mixture of acetaminophen, diphenhydramine hydrochloride and pseudoephedrine hydrochloride is used for the symptomatic treatment of common cold. in this study, a derivative spectrophotometric method based on zero-crossing technique was proposed for simultaneous determination of acetaminophen, diphenhydramine hydrochloride and pseudoephedrine hydrochloride. determination of these drugs was perf...