The carbohydrate structure of the O-glycosidicallylinked oligosaccharide chains in P-subunit of human chorionic gonadotropin (hCG$) and their precise number and locations in the polypeptide chains have been determined. A homogeneous preparation of the O-glycosidic oligosaccharide was obtained from NaOH/ NaBH,-treated human chorionic gonadotropin by chromatography on Dowex 50 and Sephadex G-25 a...

A radiochemical procedure is developed for the determination of 237Np in soil with multi-collector inductively-coupled plasma mass spectrometry (MC-ICP-MS) and gamma-spectrometry. 239Np (milked from 243Am) was used as an isotopic tracer for chemical yield determination. The neptunium in the soil is separated by thenoyl-trifluoracetone extraction from 1 M HNO3 solution after reducing Np to Np(IV...

A site energy distribution function based on a condensation approximation method is proposed for gas-phase adsorption systems following the Toth isotherm. The proposed model is successfully applied to estimate the site energy distribution of three pitch-based activated carbons (PA, PFeA and PBA) developed in our laboratory and also for other common adsorbent materials for different gas molecule...

Rat liver mitochondria were found to hydroxylate E-Ntrimethyl+lysine to produce P-hydroxy-c-N-trimethyl-L-lysine, an intermediate in carnitine biosynthesis. The hydroxylating system requires a-ketoglutarate, Fez+, and ascorbate, but does not require NADPH nor NADH. No activity was found in the microsomal or soluble fractions of liver extracts. The hydroxylated a-amino acid was isolated and char...

This manuscript describes a new protocol for determination of Pa/Th/U in marine sediments. It is based on microwave-assisted digestion and represents an important reduction of working time over conventional hot-plate digestion methods, and the use of HClO(4) is avoided. Although Th and U are completely dissolved with a first microwave step, around 40% of (231)Pa remains undissolved, and a short...

The scope of this study was the removal of ammonium by ion exchange from simulated wastewater. The study looks at the effect of organics upon ammonium ion exchange equilibrium uptake. The ion exchangers included a natural zeolite clinoptilolite, and two polymeric exchangers, Dowex 50w-x8, and Purolite MN500. The organic compounds studied included citric acid and a number of proteins. The tradit...

A large scale isolation of a disaccharide from a dialyzable fraction cf Micrococcus Zysodeikticus cell wall is described. This fraction was obtained by degradation of isolated walls with egg white lysozyme. After purification by chromatography on charcoal-Celite 2nd Dowex 1, the compound was characterized by a crystalline heptaacetyl methyl ester. Comparison with synthetic 0-2-acetamido-2-deoxy...

1,9-Diamino-5-azanonane (1, H2N(CH2)4NH(CH2)4NH2), symmetrical “homospermidine,” previously unreported in nature, has now been discovered in sandal (Santalum album L.), where it comprises 0.5-1.5% of the weight of the dried leaves. The new polyamine is conveniently isolated from an aqueous extract of the leaves by ion-exchange 1^) uring a routine examination of the amino acids from an ethanolic...

Abstract The copolymerization of glycidyl cinnamate (GC) as a hitherto non‐polymerizable, photoreactive epoxide structure to aliphatic polyether copolymers is described, using the monomer‐activated ring‐opening polymerization (MAROP). Ethoxyethyl ether (EEGE) and GC are copolymerized employing triisobutylaluminum ( i ‐Bu 3 Al) catalyst tetraoctylammonium bromide (NOctBr 4 ) an initiator. amount...