Caro’s acid-silicagel was found to be a mild and effective catalyst for the one –pot multicomponent condensation of benzyl, aldehydes and ammonium acetate used for synthesis of 2, 4, 5-trisubstituted imidazole derivatives under solvent–free conditions. This catalyst has several advantages such as simple work-up, low cost and reusability.

To overcome the rising complexity of computing systems, the paradigms of Autonomic Computing and Organic Computing have been introduced. By using an observer/controller architecture, Organic Computing aims to make embedded systems more life-like by providing them with so-called Self-X properties. Embedded real-time systems can also gain great benefit from these techniques. In this paper, we sho...

A method using thin-layer chromatography is described to determine the concentration of hippuric acid, mandelic acid, and phenylglyoxylic acid present in the urine after occupational mixed exposure to toluene and styrene. These substances are known metabolites of toluene and styrene, and therefore the evaluation to mixed exposure to toluene and styrene may be carried out separating these metabo...

in this study, quality of white button mushrooms (agaricus bisporus) treated by water and citric acid was evaluated during storage at 2 temperatures (room temperature and 4°c). the effect of modified atmosphere packaging (map, by 4±1% co2, 6±1% o2 and the remaining n2) with or without water absorbent (silicagel) was also evaluated. samples were assessed for their organoleptic properties (textur...

A micromethod is described for the separation and quantitative determination of individual bile acids in duodenal content and bile. After a mild saponification procedure for splitting the taurine and glycine conjugates, the products are separated by thin-layer chromatography on silicagel layer with the solvent system //0-octane-ethyl acetate-acetic acid (60 ml + 35 ml + 5 ml) and determined by ...