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  • Articles  (14)
  • Springer  (14)
  • International Union of Crystallography (IUCr)
  • Springer Nature
  • 1995-1999  (14)
  • Physics  (7)
  • Process Engineering, Biotechnology, Nutrition Technology  (6)
  • Mathematics  (1)
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  • Articles  (14)
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  • 1
    Electronic Resource
    Electronic Resource
    Resonance Brillouin scattering from quantized exciton-polaritons in ultrathin epitaxial layers of ZnSe (1995)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 17 (1995), S. 1753-1757 
    Details
    ISSN: 0392-6737
    Keywords: Brillouin and Rayleigh scattering ; Polaritons (including photon-phonon and photon-magnon interactions) ; Electron states in low-dimensional structures (including quantum wells, superlattices, layer structures and intercalation compounds) ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary Resonant Brillouin scattering in ultrathin MBE-grown epitaxial layers of ZnSe with thicknesses from 50 to 200 nm is esployed to investigate the properties of the 1s exciton-polariton states. The effective masses are found different from that in bulk ZnSe caused by the energetic decoupling of heavy- and light-hole states due to strain. In the 50 nm sample the momentum selection rule is relaxed, leading to broad Brillouin lines that show fine structure due to the phonon quantization in these layers, whereby dilatation and flexural phonon modes are involved in the scattering.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457275
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  • 2
    Electronic Resource
    Electronic Resource
    Biotransformation of linoleic acid with the Candida tropicalis M25 mutant (1997)
    Springer
    Applied microbiology and biotechnology 48 (1997), S. 83-87 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Linoleic acid was transformed by mutant Candida tropicalis M25 and transformations were studied in batch and fed-batch cultures. Cofermentations with palmitic acid as inducer of the fatty acid degradation pathway were performed. Besides the (Z),(Z)-octadeca-6,9-dienedioic acid, (Z),(Z)-3-hydroxyoctadeca-9,12-dienedioic acid and (Z),(Z)-3-hydroxytetradeca-5,8-dienedioic acid were obtained as the main fermentation products. The maximum concentrations of (Z),(Z)-octadeca-6,9-dienedioic acid and (Z),(Z)-3-hydroxyoctadeca-9,12-dienedioic acid reached values of 6.4 g/l and 6.9 g/l respectively. The structures of the products were characterized by chemical and spectroscopic methods. The configuration of the double bonds was not changed during bioconversion. As only one regioisomer of the hydroxylated fatty acid was detected, the hydroxylation is site-specific.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530051019
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  • 3
    Electronic Resource
    Electronic Resource
    Irradiation-induced atomic defects in SiC studied by positron annihilation (1995)
    Springer
    Applied physics 61 (1995), S. 51-53 
    Details
    ISSN: 1432-0630
    Keywords: 61.70 ; 61.80 ; 78.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The present paper reports on positron lifetime measurements on atomic defects in SiC after low-temperature (80 K) electron irradiation of low (0.47 MeV) and high (2.5 MeV) electron energies and doses from 1.8×1017 to 1.9×1019 e/cm2 as well as after subsequent isochronal annealing up to 1900 K. For these studies the single crystals of nitrogen doped (2–3×1018 cm−3) SiC grown by a modified Lely technique with hexagonal structure (6H polytype) were used. According to the positron lifetime measurements, very different types of vacancy-like positron traps are introducted after irradiation with electrons of either low or high energy. The formation of defect agglomerates and their decay at high temperatures is studied during isochronal annealing and related to earlier studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01538210
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  • 4
    Electronic Resource
    Electronic Resource
    Irradiation-induced atomic defects in SiC studied by positron annihilation (1995)
    Springer
    Applied physics 61 (1995), S. 51-53 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 61.70; 61.80; 78.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract.  The present paper reports on positron lifetime measurements on atomic defects in SiC after low-temperature (80 K) electron irradiation of low (0.47 MeV) and high (2.5 MeV) electron energies and doses from 1.8×1017 to 1.9×1019 e/cm2 as well as after subsequent isochronal annealing up to 1900 K. For these studies the single crystals of nitrogen doped (2-3×1018 cm-3) SiC grown by a modified Lely technique with hexagonal structure (6H polytype) were used. According to the positron lifetime measurements, very different types of vacancy-like positron traps are introduced after irradiation with electrons of either low or high energy. The formation of defect agglomerates and their decay at high temperatures is studied during isochronal annealing and related to earlier studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01538210
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  • 5
    Electronic Resource
    Electronic Resource
    Identification and production of 3-hydroxy-Δ9-cis-1,18-octadecenedioic acid by mutants of Candida tropicalis (1996)
    Springer
    Applied microbiology and biotechnology 45 (1996), S. 342-348 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract  The transformation of oleic acid by mutants of Candida tropicalis was studied in fed-batch cultures. Besides Δ9-cis–1,18-octadecenedioic acid, 3-hydroxy-Δ9-cis–1,18-octadecenedioic acid was detected as the main fermentation product. Here we describe the production, isolation and the complete chemical characterization of the purified 3-hydroxy-Δ9-cis–1,18-octadecenedioic acid. The geometric configuration of the double bond was not changed during bioconversion. The enantiomeric excess of the compound was 76%. Mutagenesis of C. tropicalis DSM 3152 with N-methyl-N-nitro-N′-nitrosoguanidine and selection with oleic acid as the sole carbon source led to mutant M 25, which produced the 3-hydroxy-Δ9-cis–1,18-octadecenedioic acid at a 1.8-fold higher concentration in the medium as compared to the parent strain. The maximum concentration of the hydroxy dioic acid was 19.4 g/l after 223 h fermentation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530050694
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  • 6
    Electronic Resource
    Electronic Resource
    Bioconversion of sunflower oil, rapeseed oil and ricinoleic acid by Candida tropicalis M25 (1998)
    Springer
    Applied microbiology and biotechnology 50 (1998), S. 573-578 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Bioconversions of sunflower oil and rapeseed oil in fed-batch cultures fermented with Candida tropicalis M25 were studied. Cofermentations with palmitic acid resulted in successful transformations to different 3-hydroxydioic acids. The absolute configuration of the major fermentation product, R-(Z)-3-hydroxy-9-octadecenedioic acid, was determined by comparison of the 1H NMR data with those of an authentic, optically pure compound. Using ricinoleic acid as the sole carbon source, the optically pure R-(Z)-7-hydroxy-9-octadecenedioic acid was obtained at a maximum concentration of 4.2 g/l. In addition to the hydroxydioic acid, (Z)-3,12-dihydroxy-9-octadecenedioic acid was also produced following fermentation with the mutant M25.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530051337
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  • 7
    Electronic Resource
    Electronic Resource
    Semi-bornological spaces (1996)
    Springer
    Mathematische Zeitschrift 221 (1996), S. 337-351 
    Details
    ISSN: 0025-5874
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00004517
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  • 8
    Electronic Resource
    Electronic Resource
    Analysis of broadband dielectric spectra in a Na+ mordenite (1997)
    Springer
    Ionics 3 (1997), S. 373-378 
    Details
    ISSN: 1862-0760
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The surface properties of a sodic exchanged mordenite has been studied by means of dielectric measurements. The imaginary part of the permittivity is correctly explained by using a model based on the existence of a distribution function of the interaction energies between sodium ions and the zeolitic lattice. Taking into account the sites involved in the mordenite, four elementary distribution functions have been used. The obtained global distribution function has been compared with that resulting from the application of an “ill-posed and inverse method”. A satisfactory coherence is observed between both approaches.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02375713
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  • 9
    Electronic Resource
    Electronic Resource
    Dielectric relaxation in the superionic conductorxAgI-(1−x)AgPO3 glassy system (1998)
    Springer
    Ionics 4 (1998), S. 241-248 
    Details
    ISSN: 1862-0760
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The ac dielectric response obtained on a set ofxAgI-(1−x)AgPO3 samples (x=0.15, 0.30 and 0.50) is analysed, using the Inverse and Ill-Posed Problem approach, in terms of a distribution function of relaxation times. It is then shown that the shape of the distribution function becomes narrower and more symmetric when both temperature T and the mobile cation content x increase. Although no quantitative model enables yet to explain this new experimental fact and only qualitative speculations can be proposed, it opens new prospects for theoretical approaches.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02375952
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  • 10
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    Identification and production of 3-hydroxy-Δ 9 - cis -1,18-octadecenedioic acid by mutants of Candida tropicalis (1996)
    Springer
    Details
    Publication Date: 1996-04-23
    Print ISSN: 0175-7598
    Electronic ISSN: 1432-0614
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Published by Springer
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