A new method for colorimetric determination of urinary hydroxylysine is described. Approximately one-hundredth of human urine collected for 24 hr was diluted to 25 ml and titrated to pH 2.0 with 2 hcl, and then subjected to column chromatography on Dowex 50 X 4 (H+ form). Amino acids were eluted from the column with 1.5 N NH4OH. Hydroxylysine in the elute with 1.5 N NH4OH was separated from th...

Uptakes of benzene and 12 alkylbenzenes (from toluene to n-pentylbenzene including xylene and trimethylbenzene isomers) by both strong acid cation (Dowex 50W-X4 and X8) and strong base anion (Dowex 1-X4 and X8) exchange resins have been studied in aqueous solutions at 25 degrees C; their distribution constants (K) have been determined. The relationship between the octanol-water partition coeffi...

Conventionally, the sorption methods of rare earth elements were done with cationic ion exchangers. The present work was mainly oriented to find an alternative method for sorption of light rare earth elements (LREEs) based on anionic ion exchangers. Two different anionic exchangers have been tested including Dowex-1 and Sybron SR-7. The selection of these two exchangers was mainly done to inves...

A simple column filtration was developed to clarify meat homogenate suitable enough to quantify and assess the viability of bacterial population using flow cytometry. The removal of debris from homogenized meat suspensions was achieved by passing through different column materials such as sand particles, glass beads, dowex resin, and cell debris remover (CDR). Total plate counts on tryptic soy ...

The uptakes of cycloalkanes (C5 - C8) and bicyclic aromatic compounds (naphthalene, biphenyl, and azulene) by both strong acid cation (Dowex 50W-X4 and X8) and strong base anion (Dowex 1-X4 and X8) exchange resins have been studied in aqueous solutions at 25 degrees C; their distribution constants (K) have been determined. The relationship between the octanol-water partition coefficient and the...

NADH-nitrate reductase (NR) from the primary leaves and root tips of corn seedlings (var. W64A x W182E) were activated by extracts from corn scutella. The activator extracted in potassium phosphate buffer (pH 7.5) or 80% (v/v) ethanol and fractionated by Dowex 1 (acetate) and Dowex 50 (H(+)) resins was recovered in the cationic fraction. The activator was not detected in extracts from shoots, r...

Removal of heavy metals from wastewater is obligatory in order to avoid water pollution. In the present study, performance of Dowex HCR S/S cation exchange resin was evaluated for removal of nickel and zinc from aqueous solutions. Batch shaking adsorption experiments were performed in order to examine the effects of pH, dosage of resin and contact time on removal process. It was observed that m...

Abstract An overview of recent improvements in the understanding and maturity of linear mode photon counting with HgCdTe electron-initiated avalanche photodiodes is presented. The first HgCdTe LMPC 2x8 format array fabricated in 2011 with 64 μm pitch was a remarkable success in terms of demonstrating a high single photon signal to noise ratio of 13.7 with an excess noise factor of 1.3-1.4, a 7 ...