1. A new column-chromatographic method is described for the simple and reproducible determination of the concentration of [des-Asp1]angiotensin II (angiotensin III) in rat plasma. 2. The method uses the different abilities of the ion-exchange resins Dowex 1 (X8) and Bio Rex 70 to bind angiotensin II and angiotensin III. Under the conditions used, Bio Rex 70 binds only angiotensin III. Angiotens...

The quantitative separation of amino acids by chromatography on columns of starch has sheen described in previous publications (l-3). In extending these investigations, a systematic study has been made of the separations of amino acids by elution analysis on columns of synthetic ion exchange resins. With a sulfonated polystyrene resin, Dowex-50, it has been possible to develop a chromatographic...

A sensitive method for the preconcentration and determination of trace amounts of Co, Cu and Zn by energy-dispersive X-ray fluorescence spectrometry (EDXRF) has been developed. The method is based on the fact that 4-(2-pyridylazo)-resorcinol (PAR) loaded Dowex anion-exchange resin (PAR-resin) can effectively adsorb Co, Cu and Zn at pH 9.0 to form PAR-metal complexes. The detection limits for Co...

The polymer supported hypochlorite ion is a facile selective oxidizing agent for the oxidation of various alcohols to aldehydes and ketones. Similarly is successfully oxidizes various Hantzsch type 1,4- dihydropyridines to corresponding pyridines.

The SFS-Wetland model used is the wastewater treatment tank belonging to Pertamina Geothermal Lahendong. Based on slope of existing land, it possible design twin gravity wetlands a certain size. This study aimed develop Surface Flow System Constructed Wetland using Monocaria vaginalis, Salvania molesta and Colocasia esculenta, analyze stakeholder perceptions Model, refine this based perceptions...

The paper describes the development of an automatic on-line column pre-concentration technique using a time based-flow injection atomic absorption spectrometry system. A manifold incorporating a micro-column containing 25 mg of Dowex 50W-X8 was used with a time-based injector for the pre-concentration and determination of copper in natural and drinking waters. The system features depend on the ...

Antibiotic G-418 is a new aminoglycoside produced as the major component by a new species of Micromonospora, M. rhodorangea NRRL 5326. The antibiotic is prepared by submerged fermentation in a soybean-dextrin medium. Antibiotic G-418 is adsorbed on a cationic-exchange resin and separated from other impurities by passing it down a Dowex (1 x 2) resin column. The antibiotic, which contains 2-deox...

The occurrence of isomeric dinucleotides in the digest of deoxyribonucleic acid (DNA) with pancreatic deoxyribonuclease (DNase I) has been recently reported by Sinsheimer (1). The isomers were of the type (d)pXpY or (d)pYpX,’ the system of abbreviations being used which was suggested by Smith and Markham (2), and extended by Heppel et al. (3) and Privat de Garilhe and Laskowski (4). Although su...