The CTE-related loss for spectrophotometry of point sources with the STIS CCD is parametrized in terms of dependencies on the signal level of the source spectrum within the extraction box, the background level, and the signal in the point spread function located between the standard extraction box and the read-out amplifier. Primary constraints on the CTE correction algorithm are provided by es...

A method has been described for the determination of individual Unconjugated 17-oxosteroids in human urine. The procedure involves the immediate extraction of the sample, purification steps and a paper Chromatographie separation of steroids. The 17-oxosteroids were evaluated by a Zimmermann-reaction in situ on the paper, elution of chromogens and spectrophotometry. Values for the excretion of U...

Turmeric leaves (Curcuma longa L.) contain secondary metabolites, one of which is a phenolic compound. The choice solvent important in the extraction process, ethanol chosen because it can attract compounds that are soluble non-polar to polar solvents. concentrations this study were 60, 70, 80, and 96% with method used was maceration. screening test obtained positive results for content. This i...

In recent years, drug use is on the rise, causing environmental pollution. Therefore, control a common practice in many laboratories. This project focuses increasing method for determining small amounts of norfloxacin aqueous and biological samples. Solid-phase extraction samples using 2-aminopyridine/graphene oxide nano-plates visible ultraviolet spectrophotometric measurements are used These ...