We examined 17 lots of 2-oxoglutarate (seven acid forms, three K salt forms, and seven Na salt forms), obtained from eight commercial suppliers, for suitability for measuring aspartate aminotransferase (EC 2.6.1.1) and alanine aminotransferase (EC 2.6.1.2) in human serum. Measurements of the catalytic activity concentrations of these two aminotransferases with each of these 17 preparations were...

The classic spectrophotometric method for identification and characterization of respiratory enzymes has been used for the study of the cytochrome system of Aplysia. Particles have been prepared from the buccal mass and the gizzard muscles. Difference spectra taken on isolated particle suspensions show the presence of a complete cytochrome system composed of five components: cytochrome a, b, c,...

This study examined the role of self-monitoring support for writing skill improvement in a reciprocal peer review of writing system called SWoRD (Cho & Schunn, 2007). Because self-monitoring has been identified as a critical component in self-regulated learning (Butler & Winne, 1995; Cresswell, 2000; Zimmerman & Risemberg, 1997), students were provided with opportunities to self-monitor their w...

A novel simple, sensitive and rapid kinetic-spectrophotometric method for the determination of trace amounts of nitrite is proposed. The method is based on its catalytic effect on the oxidation of congo red (CR) by potassium bromate in acidic solution. The oxidation reaction is monitored spectrophotometrically by measuring the decrease in the absorbance of CR at a suitable λmax = 570 nm for the...

The therapeutic effect of medicinal plants for the treatment of various diseases is based on the chemical compounds in these plants. The major components are organic compounds, some of which have biological activity, but none act independently and they cannot replace the functions of the medicinal plant as a whole. Analyses have revealed that medicinal plants are rich in many trace elements, an...

A catalytic method has been developed for the determination of microgram amounts of mercury (II) based on its catalytic effect on the rate of a ligand substitution reaction. The reaction studied involved the substitution of cyanide in hexacyanoferrate (II) by resacetophenone benzoic acid hydrazone (2’, 4’dihydroxy propiophenone benzoic acid hydrazone) and the reaction was monitored spectrophoto...

Full Text PDF. Recovery studies were performed using 0. 5 mL of red wine and whisky. Enter the password to open this PDF file. spectrophotometric determination of ethanol in wine pdf Treatment procedures, and only spectrophotometry is used1 Jan 2012. The method consists of color reaction of ethanol with sodium dichromate. SPECTROPHOTOMETRIC DETERMINATION. For spectrophotometric determination of...