UNLABELLED BACKGROUND Previously described methods to separate dissolved U(IV) from dissolved U(VI) under acidic anoxic conditions prior to laboratory analysis were ineffective with materials currently available commercially. Three strong anion exchange resins were examined for their efficiency in separating, recovering, and preserving both redox states during separation. RESULTS Under oxi...

Although many endo-ß-1,4-glucanases have been isolated in invertebrates, their cellulolytic systems are not fully understood. In particular, gastropod feeding on seaweed is considered an excellent model system for production of bioethanol and renewable bioenergy from third-generation feedstocks (microalgae and seaweeds). In this study, enzymes involved in the conversion of cellulose and other p...

Acetylcarnitine and acylcarnitine are hydrolyzed by alkaline hydrolysis. The total carnitine is measured by incubation of the sample with 14CacetylCoA and carnitine acetyltransferase. The radioactive acetylcarnitine is separated from the unreacted radioactive acetylCoA using a Dowex 2 x 8 anion exchange column. The radioactive acetylcarnitine fraction is quantitated by counting in a liquid scin...

Dowex-50W-hyodrgen ion exchange resin was used as a reusable catalyst for the synthesis of oxazoline, imidazoline and thiazoline derivatives through condensation reaction between arylnitriles and 2-aminoalcohol, ethylenediamine or 2-aminoethanthiol. This process provides several advantages such as excellent yields of the products, simple operation, convenient separation and inexpensive and recy...

A new 5'-nucleotidase inhibitor named nucleoticidin was produced by Pseudomonas sp. YM-3229G. It was isolated from a fermentation broth by trichloroacetic acid extraction, ethanol precipitation and Dowex 1 and DEAE-52 column chromatography. It inhibited 5'-nucleotidase activity of snake venom and rat liver membrane. It also showed antitumor activity against solid type Sarcoma 180.

Flow calorimetry, which is ideally suited for measuring reactions oc­ curring at the liquid/solid interface, has been used to study the surface chemistry of many types of solids, but little use of it has been made in the study of surface reactions of soils. The purpose of this study was to demonstrate the application of flow calorimetry to the study of two fun­ damental soil chemical processes,...

1. Effects of starvation or treatment with a cation exchange resin, dowex 50, parallel in some respects those seen earlier on the respiration and fermentation of bakers' yeast receiving 90,000 r of 250 kv. x-rays. Starvation increased the radiosensitivity of cell division processes whether measured by colony formation or by turbidimetric determination of growth in a liquid medium. The dowex 50 ...

Un método de adsorción utilizando la resina Dowex™Marathon™ WBA ha sido desarrollado con el fin evaluar larecuperación ácido cítrico producido por fermentación sumergida. Para determinar viabilidad este separación, fue evaluada a diferentes condiciones temperatura (30 – 70 °C) y pH (1.5 6.5). Los resultadosmostraron que bajo, se mejora cítrico, través cual, recupera 85% del obtiene una pureza 9...

A highly sensitive adenylate cyclase assay method has been developed which employs sequential chromatography on columns of Dowex cation exchange resin and aluminum oxide. With the use of [a-“‘PIATP as substrate, this method permits the nearly complete separation of cyclic [“‘PIAMP formed from the substrate and other “P-containing compounds, i.e., “P in the assay blanks was barely detectable. In...