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  • Articles: DFG German National Licenses  (3)
  • brown algae  (2)
  • STM  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Extraction of alginic acid from a Brazillian brown alga, Laminaria brasiliensis (1987)
    Springer
    Hydrobiologia 151-152 (1987), S. 551-555 
    Details
    ISSN: 1573-5117
    Keywords: seaweed ; alginate ; yield ; M:G ratio ; brown algae ; Laminaria brasiliensis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00046181
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    STM Spectroscopy on Anisotropic Superconductors (1999)
    Springer
    Journal of superconductivity 12 (1999), S. 519-523 
    Details
    ISSN: 1572-9605
    Keywords: STM ; electron tunneling ; organic superconductors ; pairing symmetry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The superconducting phase of organic superconductors κ-(BEDT-TTF)2Cu(NCS)2 and (MDT-TTF)2AuI2 was investigated by the electron tunneling spectroscopy using low temperature STM. The tunneling differential conductance at the lateral surface of κ-(BEDT-TTF)2Cu(NCS)2 varies its shape depending on the tip direction. The in-plane anisotropy of the conductance is well explained by the d-wave symmetry with line nodes along the direction 45° from the c-axis. For (MDT-TTF)2AuI2, the tunneling conductance at T = 1.4 K shows the superconducting energy gap structure clearly. The finite conductance inside the gap edge suggests the gap anisotropy. The tunneling spectrum is explained by the d-wave pairing. The obtained gap Δ0 = 2 meV (2Δ0/kT c = 12) is larger than that of the weak coupling limit. The pseudogap structure is observed near T c .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007732201440
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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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    Paper (German National Licenses)
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