EinWGA-inhibierendes Oligosaccharid aus Blutgruppen-H-Substanz

Blood groupH substance prepared from pig gastric mucosa is a potent inhibitor of the haemagglutinating action ofWGA (wheat germ agglutinin). From the blood group substance, upon treatment with NaOH–NaBH₄, aWGA-inhibiting oligosaccharide was detached, which was purified by gel filtration and paper chromatography and shown by gas chromatography to contain galactose, N-acetylglucosamine and N-acetylgalactosaminitol in a molar ratio of 231. Enzymatic release of a N-acetylglucosamine residue destroyed theWGA-inhibitory activity of the oligosaccharide. The importance of terminal N-acetylglucosamine residues for the interaction withWGA is discussed.

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Verwendete Abkürzungen WGA Wheat germ agglutinin, Weizenkeimlingsagglutinin - BGS-H Blutgruppen-H-Substanz - Fuc Fucose - Gal Galactose - GalNAc N-Acetylgalactosamin - GalNAc-ol N-Acetylgalactosaminitol - GlcNAc N-Acetylglucosamin - NeuNAc N-Acetylneuraminsäure - HU Hämagglutinationseinheit - TFA Trifluoracetyl     

Die Fluoreszenz von Z1-Zentren in KCl

Zeitschrift für Physik A Hadrons and nuclei - Detailed measurements on the absorption, emission and excitation spectra of Z1 centers in KCl doped with Ca, Sr or Ba are reported. Beyond the...     

Erzeugendensysteme und der A-Dimensionssatz in Atomaren Modularen Verbänden

In atomic modular lattices a special dimension can be introduced by atoms. The question was, whether the dimensional formula holds. Trying to prove this leads to a problem, formulated by Olaf Tamaschke (see [5]). It is shown here that an additional property is necessary, called atomic closed (atomar abgeschlossen). With this quality some new theorems can be proved. For instance: lattices not being atomic closed contain a special sublattice, and in lattices of finite length this property is equivalent to the validity of the dimensional formula.     

Substituted-γ-lactones. XXIX. N-heterocycles via photolysis or thermolysis of 3-(2-azidophenylmethylene)-4,5-dihydro-2-(3H)furanone

The thermolysis and/or photolysis of 3-(2-azidophenylmethylene)-4,5-dihydro-2-(3H)furanone offers a preparatively useful way towards the synthesis of indoles and quinolines. This method is superior over previously published methods which afforded these heterocycles in poor yields by the deoxygenative cyclization of 3-(2-nitrophenyImethylene)-4,5-dihydro-2-(3H)furanones. J. Heterocyclic Chem., 15 , 703 (1978)     

Synthese von optisch aktiven,natürlichen Carotinoiden und strukturell verwandten Verbindungen. III. Synthese von (+)-Abscisinsäure, (−)-Xanthoxin, (−)-Loliolid, (−)-Actinidiolid und (−)-Dihydroactinidiolid

Synthesis of optically active natural carotenoids and structurally related compounds. III. Synthesis of (+)-abscisic acid, (?)-xanthoxin, (?)-loliolide, (?)-actinidiolide, and (?)-dihydroactinidiolide The syntheses of (+)-abscisic acid ( 1 ), (?)-xanthoxin ( 2 ), (?)-loliolide ( 3 ), (?)-actinidiolide ( 4 ), and of (?)-dihydroactinidiolide ( 5 ) from one common starting material are reported. The syntheses yield also some enantiomeric or diastereomeric analogues.