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  • 1
    Electronic Resource
    Electronic Resource
    Structure of the organic superconductor (DMET)2AuCl2 (1990)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 46 (1990), S. 1652-1655 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270190000555
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The crystallographic structure of the natural air-hydrate in Greenland dye-3 deep ice core (1990)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 8 (1990), S. 17-24 
    Details
    ISSN: 1573-1111
    Keywords: Air-hydrate ; clathrate ; ice core ; guest molecule
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract We have carried out X-ray diffraction studies on single crystals of natural air-hydrate in deep ice cores recovered at Dye-3 Greenland. Integrated intensities for 470 diffracting planes were measured by an automated four-circle diffractometer. The space group determined is cubicFd3m and the lattice constant is 17.21(3) Å. These results indicate that the crystallographic structure is the Stackelberg's structure II, in contrast to the previously anticipated structure. This finding agrees with the recent results on the synthetic air-hydrate by Davidsonet al. It was also found by difference Fourier synthesis for guest molecules that electron density in a 16-hedral cage has multiple maxima displaced from the center of the cage while that in the 12-hedron was approximately spherical.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01131284
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Sugar constituents of fucose-containing polysaccharides from various Japanese brown algae (1990)
    Springer
    Hydrobiologia 204-205 (1990), S. 573-576 
    Details
    ISSN: 1573-5117
    Keywords: brown algae ; fucose-containing polysaccharide ; neutral sugar ; seaweed ; uronic acid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Sugar constituents of the fucose-containing polysaccharides (FCPs) from 21 species of brown algae were analyzed. FCPs were extracted with hot water (100 °C, 4 h), separated by precipitation with 20% (v:v) ethanol in the presence of 0.05 M MgCl2 to remove contaminating soluble alginate, and purified by DEAE-Sephadex column chromatography. The samples were hydrolyzed with HCI, and neutral sugar and uronic acid were separated by anion exchange chromatography. Their amounts were determined by gas-liquid chromatography. The neutral sugars in the FCPs from Ishige okamurae, Laminaria ochotensis, Myelophycus simplex, Padina arborescens and Sargassum thunbergii all contained arabinose, fucose, galactose, glucose, mannose, rhamnose and xylose residues. The FCPs from Ishige okamurae, Padina arborescens, Sargassum hemiphyllum, S. patents and S. sagamianum contained the four uronic acids, galacturonic acid, glucuronic acid, guluronic acid and mannuronic acid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00040289
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of alginates on the ingestion and excretion of cholesterol in the rat (1993)
    Springer
    Journal of applied phycology 5 (1993), S. 207-211 
    Details
    ISSN: 1573-5176
    Keywords: alginates ; cecum ; cholesterol ; excretion ; food efficiency ; ingestion ; rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effects of three forms of alginate (free acid, sodium and calcium salts) on ingestion and excretion of cholesterol in the rat were studied. For two weeks, Male Sprague-Dawley rats were fed a cholesterol-rich diet containing 3% alginate from the brown alga Ascophyllum nodosum. The food efficiency of the three types of alginate was: Na-alginate 〉 Ca-alginate 〉 alginic acid. A significant increase in the weight of cecum was also observed in alginate diets. Alginate was not effective in preventing the elevation of serum total cholesterol levels, although irregularly changing patterns were observed. The cholesterol level of liver showed a tendency to decrease with alginate feeding, while fecal excretion of cholesterol increased.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00004019
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    Paper (German National Licenses)
    Fulltext
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