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  • 1990-1994  (10)
  • 1960-1964  (4)
  • 1994  (10)
  • 1963  (4)
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  • 1990-1994  (10)
  • 1960-1964  (4)
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    d-Lysergyl-l-valin-methylester, ein neues, natürliches Mutterkornalkaloid (1963)
    Springer
    Cellular and molecular life sciences 19 (1963), S. 397-398 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A description is given of the isolation from ergot ofd-Lysergyl-l-valine methyl ester, a new minor alkaloid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02171505
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Inelastic Cross Sections for Positron Scattering from Atomic Hydrogen (1994)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 175-178 (Nov. 1994), p. 1009-1014 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/01/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.175-178.1009.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Preflare state (1994)
    Springer
    Solar physics 153 (1994), S. 1-17 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Discussion on the preflare state held at the Ottawa Flares 22 Workshop focused on the interpretation of solar magnetograms and of Hα filament activity. Magnetograms from several observatories provided evidence of significant build up of electric currents in flaring regions. Images of X-ray emitting structures provided a clear example of magnetic relaxation in the course of a flare. Emerging and cancelling magnetic fields appear to be important for triggering flares and for the formation of filaments, which are associated with eruptive flares. Filaments may become unstable by the build up of electric current helicity. Examples of heliform eruptive filaments were presented at the Workshop. Theoretical models linking filaments and flares are briefly reviewed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00712489
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Relationship between electric currents, photospheric motions, chromospheric activity, and magnetic field topology (1994)
    Springer
    Solar physics 149 (1994), S. 309-330 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Through coordinated observations made during the Max'91 campaign in June 1989 in Potsdam (magnetograms), Debrecen (white light and Hα), and Meudon (MSDP), we follow the evolution of the sunspot group in active region NOAA 5555 for 6 days. The topology of the coronal magnetic field is investigated by using a method based on the concept of separatrices - applied previously (Mandriniet al., 1991) to a magnetic region slightly distorted by field-aligned currents. The present active region differs by having significant magnetic shear. We find that the Hα flare kernels and the main photospheric electric current cells are located close to the intersection of the separatrices with the chromosphere, in a linear force-free field configuration adapted to the observed shear. Sunspot motions, strong currents, isolated polarities, or intersecting separatrices are not in themselves sufficient to produce a flare. A combination of them all is required. This supports the idea that flares are due to magnetic reconnection, when flux tubes with field-aligned currents move towards the separatrix locations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00690619
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  • 5
    Electronic Resource
    Electronic Resource
    Mantle plumes and episodic crustal growth (1994)
    [s.l.] : Nature Publishing Group
    Nature 372 (1994), S. 63-68 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Many hitherto puzzling features of the isotope and trace-element geochemistry of the Earth's mantle and crust can be explained if Earth history is punctuated by episodes of enhanced exchange between the lower and upper mantle. Such episodes would replenish the upper mantle with trace elements, and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/372063a0
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  • 6
    Electronic Resource
    Electronic Resource
    Notes and documents concerning the discovery of LSD (1994)
    Springer
    Inflammation research 43 (1994), S. 79-81 
    Details
    ISSN: 1420-908X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01986673
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  • 7
    Electronic Resource
    Electronic Resource
    Immunoblot using recombinant antigens derived from different genospecies of Borrelia burgdorferi sensu lato (1994)
    Springer
    Medical microbiology and immunology 183 (1994), S. 43-59 
    Details
    ISSN: 1432-1831
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Immunodominant proteins are variable in molecular and antigenic structure among different genospecies of Borrelia burgdorferi sensu lato. We have recently developed an immunoblot using five recombinant antigens: the chromosomal-encoded B. burgdorferi proteins p 100, the flagellin and an internal flagellin fragment thereof, and the plasmid-encoded outersurface proteins A (OspA) and C (OspC). In the present study the same antigens (derived from strain PKo, genospecies B. afzelii) were compared with the homologous recombinant proteins from strain B31 (genospecies B. burgdorferi sensu stricto) and with OspA, OspC and the internal flagellin fragment from strain PBi (genospecies B. garinii). Patients with neuroborreliosis (n=28) and patients with acrodermatitits chronica atrophicans (n=20) were investigated in the IgG immunoblot; the IgM immunoblot was performed only in patients with neuroborreliosis. There was a small increase in the detection rate of OspA-specific IgG or IgM antibodies using the different variants of recombinant OspA; however, OspA remained an insensitive antigen for antibody detection in Lyme borreliosis. The same was true to OspC-specific IgG antibodies. The sensitivity of OspC, which is the immunodominant antigen for IgM antibody detection, could not be increased using recombinant antigens derived from different strains. However, some sera which were negative in the recombinant immunoblot reacted with OspC in the conventional immunoblot using B. burgdorferi whole cell lysate as antigen. The most unexpected finding was the high degree of immunological heterogeneity of the internal flagellin fragments: IgG antibodies were detected in 18 of 48 patients using B31 fragments, in 25 of 48 using PKo fragments, in 23 of 48 using PBi fragments versus 33 of 48 when the three recombinant proteins were combined. PKo-derived fragments were more sensitive for antibody detection in patients with acrodermatitis chronica atrophicans, B31- and PBi-derived fragments for antibody detection in patients with neuroborreliosis. This is in agreement with the fact that isolates from patients with neuroborreliosis are predominantly belonging to the genospecies B. burgdorferi sensu stricto and B. garinii. For detection of IgM antibodies in sera from patients with neuroborreliosis, recombinant internal fragments derived from strains B31 and PBi were more sensitive than the PKo-derived fragment. The best discrimination between neuroborreliosis sera and control sera was achieved when the IgM blot was performed using recombinant internal flagellin fragments derived from strains PKo and PBi and OspC derived from B31 or PKo.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00193630
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  • 8
    Electronic Resource
    Electronic Resource
    First analytical results using a multi-ion counting system of a spark source mass spectrometer (1994)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 350 (1994), S. 642-644 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Isotope dilution measurements of geological reference materials are described using a newly developed multi-ion counting (MIC) system for a spark source mass spectrometer. Compared with the conventional photoplate detection system, there are considerably improved analytical features of the MIC system, especially the high sensitivity which leads to short measuring times of 1 min to 1 h for trace element analysis on the μg/g — ng/g level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00323519
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  • 9
    Electronic Resource
    Electronic Resource
    Compatibility between PAN-based carbon fibres and Mg8Li alloy during the pressure infiltration process (1994)
    Springer
    Journal of materials science 29 (1994), S. 5576-5582 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The interaction of PAN-based T800H type carbon fibres, which had been coated with (i) pyrocarbon and (ii) pyrocarbon+SiC protective layers, was studied by means of SEM, energy-dispersive X-ray analysis and Auger electron spectroscopy. The interaction occurred during the pressure infiltration process at temperatures from 898 to 908 K and at contact times of 4–30 s. As detected by AES measurements, both Mg and Li penetrated throughout the carbon fibres, and Li2C2 was formed without remarkable reaction zone occurrence, which led to carbon fibre degradation. The pyrocarbon layer (about 50 nm thick) demonstrated a good protective efficiency and the corresponding metal-matrix composite exhibited satisfying strength characteristics; nevertheless, the influence of processing variables (temperature, time) was obvious. On the other hand, the double-coated pyrocarbon+SiC carbon fibres were strongly affected by Li2C2 formation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00349949
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  • 10
    Electronic Resource
    Electronic Resource
    Results of the Bielefeld-Brookhaven e+-H experiment (1994)
    Springer
    Hyperfine interactions 89 (1994), S. 221-242 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Positronium formation (Ps) cross sections for positrons impinging on atomic hydrogen were measured in the impact energy range from 13 to 255 eV at the High Intensity Positron (HIP) beam at Brookhaven National Laboratory (BNL). The Ps-formation cross section was found to rise rapidly from the threshold at 6.8 eV to a maximum value of (2.98±0.18) ×10−16 cm2 for ∼15 eV positrons. By 75 eV it drops below the detection limit of 0.17×10−16 cm2 which is the present level of statistical uncertainty. A more elaborate data analysis was performed leading to somewhat smaller cross sections than originally published [1]. During the course of this experiment further relative data on impact-ionization cross sections were accumulated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02064508
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