Showing papers in "Acta Chemica Scandinavica in 1988"

Production of active human carbonic anhydrase II in E. coli.

Abstract: cDNA encoding human carbonic anhydrase II has been isolated and its nucleotide sequence determined. Expression of the isolated carbonic anhydrase gene in Escherichia coli from a plasmid containing the tac promoter yielded an active enzyme at a level of about 1% of total protein.

The Molecular Structure and Tautomer Equilibrium of Gaseous 1,2,3-Triazole Studied by Microwave Spectroscopy, Electron Diffraction and Ab Initio Calculations

Abstract: Author Institution: Department of Organic Chemistry, Technical University of Denmark; Department of Chemistry, University of Oslo; Department of Chemistry, Oslo College of Engineering; Department of Chemistry, University of Oslo; Chemical Laboratory v, University of Copenhagen

Synthesis of 4-(phenylethynyl)-2,6-bis [N,N-bis-(carboxymethyl) aminomethyl] pyridine

Abstract: Synthese de bis-bromomethyl-2,6 bromo-4 pyridine (A) a partir d'acetyl-3 dihydro-3,4 methyl-6 pyrannedione-2,4 ou d'acide hydroxy-4 pyridinedicarboxylique-2,6; A reagit avec l'imino-2,2' bis-acetate de di-t-butyle puis avec l'ethynylbenzene pour donner le compose du titre

Carbonatization of YBa2Cu3O6+x

Abstract: YBa 2 Cu 3 O 6+x reagit avec CO 2 a une vitesse significative au-dessus de 400°C. Au-dessous de 730°, les produits de reaction sont BaCO 3 , Y 2 O 3 et CuO; au-dessus, ce sont BaCO 3 , Y 2 Cu 2 O 5 et CuO

Crystallographic studies of molecular complexes containing hexafluorobenzene

Abstract: Synthese des etudes cristallographiques realisees sur les composes d'addition 1:1 de l'hexafluorobenzene avec des hydrocarbures et des amines aromatiques. Dans tous les composes etudies, les molecules associees sont empilees alternativement en des colonnes infinies. Beaucoup de ces composes ont des structures cristallines desordonnees a temperature ambiante et forment des cristaux macles, les structures devenant ordonnees par refroidissement

Animal carotenoids. 32. Carotenoids of Mytilus edulis (edible mussel).

Abstract: Nineteen different carotenoids have been isolated from various harvests of Mytilus edulis (edible mussels) Besides beta,beta-carotene (occasional) these were ten acetylenic C40-carotenoids: crocoxanthin-like, anhydro-amarouciaxanthin B, 19'-hexanoyloxyisomytiloxanthin, isomytiloxanthin, alloxanthin, mytiloxanthin, amarouciaxanthin B-like, halocynthiaxanthin, pectenol-like and heteroxanthin; two acetylenic C37-carotenoids: pyrrhoxanthinol and hydrato-pyrrhoxanthinol; four C40-skeletal allenic carotenoids: 19'-hexanoyloxyfucoxanthin, fucoxanthin, 19'-hexanoyloxyfucoxanthinol and fucoxanthinol; two C37-skeletal allenic carotenoids: peridinin and peridininol Anhydro-amarouciaxanthin B, 19'-hexanoyloxyisomytiloxanthin (minor occasional) and hydrato-pyrrhoxanthinol constitute new carotenoids The characterization comprised TLC and HPLC behaviour, VIS spectrophotometry, 1H NMR (including full assignment of three new carotenoid end groups), CD and mass spectra, as well as chemical derivatizations Stereochemical considerations are discussed

Neutron Diffraction Refinement of the Structure of Pentaerythritol.

Abstract: Cristallisation dans I4 avec affinement jusqu'a 0,042. Les liaisons hydrogene forment des quadrilateres le long des axes 4

Experimental evaluation of the VBCM model for nucleophilic substitutions

Abstract: Cinetique des reactions de substitution entre divers nucleophiles conjugues (enolates, dianions et nucleophiles neutres) et des halogenoalcanes et halogenures benzyliques

Improved preparation, chromatographic separation and X-ray crystallographic determination of the absolute configuration of the enantiomers of 8-hydroxy-2-(dipropylamino) tetralin (8-OH DPAT)

Abstract: Dedoublement optique de la benzylamino-2 methoxy-8 tetraline, intermediaire synthetique de l'hydroxy-8 dipropylamino-2 tetraline. Les enantiomeres de ce dernier sont analyses par chromatographie paire ion et on en etudie la configuration absolue par diffraction RX

Synthesis of some substituted dimethyl and diethyl 4-(phenylethynyl)-2,6-pyridinedicarboxylates

Abstract: Synthese du compose du titre par reaction de l'ethynyl aniline avec le phenyl-3 dimethyl-2,2 propyne-2ol-1

Crystal structure of Y2Cu2O5 refined from powder neutron diffraction data

Abstract: Y 2 Cu 2 O 5 , a 20 K, cristallise avec le groupe d'espace Pna2 1 . Affinement de la structure jusqu'a 0,040

Note on ethene and other low-molecular weight hydrocarbons in environmental tobacco smoke.

Abstract: Levels of ethene and propene, together with those of some other light hydrocarbons (propane, butane, isobutane and ethyne), have been measured under realistic conditions in environmental tobacco smoke (ETS) as a step towards the elucidation of the sources of 2-hydroxyethyl and 2-hydroxypropyl adducts of hemoglobin observed in non-smokers. These adducts may reflect in vivo doses of carcinogenic epoxides that are metabolites of the respective alkenes. The data show that 2.0 mg ethene, 1.4 mg propene, and 0.7 mg propane together with smaller amounts of butane, isobutane and ethyne are released per cigarette smoked (0.66 g tobacco) of a common Swedish brand. The alkenes in ETS should be considered as contributing factors to a risk of systemic cancer from passive smoking. With regard to alkene intake, even a relatively mild exposure to ETS (2 cigarettes per h for 5 h per day in a 33 m3 room with one air change per hour is estimated to correspond to the active smoking of about one cigarette per day.

(tert-Butyldimethylsilyloxy) methyl chloride: synthesis and use as N-protecting group in pyrimidinones

Abstract: Synthese a partir d'ethylthiomethanol et de chloro t-butyl dimethyl silane; application a la synthese de chloro-5 phenacyl-1 phenyl-4 1H-pyrimidone-2 a partir de chloro-5 1H-pyrimidone-2 et a la synthese de benzyloxymethyl-3 thymine a partir de bis-trimethylsiloxy-2,4 methyl-5 pyrimidine