Two simple, rapid and accurate spectrophotometric and spectrofluorimetric methods developed for the determination of Tofisopam (TF) in pure form and in pharmaceutical formulation. The spectrophotometric method (A) is based on the reduction of ferric into ferrous in presence of 1, 10-phenanthroline to give an orange –red colored ferroin complex measured at 510 nm. Method (B) spectrofluorimetric ...

Sensitive visual and micro spectrophotometric methods have been developed for field determination of trace iron in fresh water samples. For the visual method, a water sample (0.45-microm filtrate acidified to 0.1 M HCl) was placed in a glass vial and mixed with a reagent solution containing 1,10-phenanthroline, sodium thiocyanate and 0.1 M HCl. Iron was extracted as pink ferroin thiocyanate wit...

From fireflies that synchronize their flashes with each other to heart muscles contracting and relaxing in unison, synchronized behavior of living cells or organisms is ubiquitous in nature. Chemical reaction–diffusion systems can help us understand the mechanisms that underlie such synchronization. Coupled chemical oscillators have previously been studied in the laboratory with large reactors ...

With the rapid development of information concerning the isolation, identification, and physiological levels of corticosteroids, a relatively simple microchemical met,hod for their quantitative estimation appears ta be desirable. Since the known biologically active adrenal cortical hormones contain a primary cu-ketol function, an cr,@msaturated %-ketone group, or both, several methods based upo...

With the rapid development of information concerning the isolation, identification, and physiological levels of corticosteroids, a relatively simple microchemical met,hod for their quantitative estimation appears ta be desirable. Since the known biologically active adrenal cortical hormones contain a primary cu-ketol function, an cr,@msaturated %-ketone group, or both, several methods based upo...

FKN mechanism of the BZ reaction (expanded “Oregonator”) agree surprisingly well with the experimental data. Similar conclusions hold in the case when the system of two coupled CSTR’s with forcing of one of them is inve~t iga ted .~~ Both permanent and temporal extinction of oscillations are observed and m ~ d e l e d . ~ ~ . ~ ~ Early experimental observations of complex chemical wave trains g...