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  • 1
    Electronic Resource
    Electronic Resource
    Optical fibre packaging in loose fitting tubes of orientated polymer (1977)
    Springer
    Optical and quantum electronics 9 (1977), S. 493-498 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract A technique is described by which an optical fibre may be packaged in a loose fitting tube of oriented polypropylene. This structure offers substantial improvements in resistance to microbending. The linear expansion coefficient of the material is very small and can be varied about zero, allowing matching to the fibre so that temperature variations do not cause fibre buckling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01208759
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Calculation of 5250.216 Å line profiles in sunspots (1972)
    Springer
    Solar physics 26 (1972), S. 83-86 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The assumptions of pure absorption and local thermodynamic equilibrium are sometimes used to calculate approximate spectral line profiles in cases where a rigorous treatment is impractical or impossible. In certain conditions, the profile is not completely defined under these assumptions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00155107
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Determination of solar Doppler widths by Goldberg's method (1971)
    Springer
    Solar physics 16 (1971), S. 272-285 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The so-called ‘Goldberg’ or ‘profile intercomparison’ method of determining Doppler widths from spectral line profiles was used to analyze a group of high quality solar profiles which were observed with the McMath solar telescope at the Kitt Peak National Observatory. The observations consisted of profiles of eight lines of calcium and chromium, made at either four or five positions on the solar disk. A depth dependence of solar microturbulence could not be derived by applying the Goldberg method to a single pair of lines at a single disk position. When the depth dependence was determined from line pairs at different disk positions, a depth dependent turbulence model was obtained. The final model was anisotropic with radial and tangential components increasing with depth in the atmosphere.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00162469
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The association between PrP and infectivity in scrapie and BSE infected mouse brain (1996)
    Springer
    Archives of virology 141 (1996), S. 275-289 
    Details
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The structure of the scrapie agent remains unknown. However, scrapie infectivity tends to co-sediment with an infection specific fraction of the glycoprotein PrP (PrPSc) under conditions which solubilise the normal form of this protein (PrPc); accordingly, PrP has been proposed as a candidate component of the agent. To investigate this further we have been examining a new scrapie-related murine model in conjunction with established scrapie models. A bovine spongiform encephalopathy (BSE) derived murine model has short incubation periods, high infectivity titre and low amounts of PrP deposited in the brain. A membrane fraction from scrapie/BSE infected brain is solubilised with Sarkosyl at pH⩾9.0. Most PrP is also solubilised. In models of the disease with little deposition of PrP in the brain, this solubilisation step is particularly effective in reducing the amounts of PrP sedimented from brain extracts. Gradient centrifugation of the sedimented fraction shows further separation of infectivity and the residual PrP. It is concluded that at least some PrPSc in the brain need not be associated directly with infectious agent but is deposited in brain solely as a pathological product of infection. However, a residual sedimentable fraction contains PrP which may be a component of the agent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01718399
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  • 5
    Electronic Resource
    Electronic Resource
    Experimental studies on the interaction between infections ofOstertagia leptospicularis and other bovineOstertagia species (1984)
    Springer
    Parasitology research 70 (1984), S. 809-817 
    Details
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Experimental infections of calves were carried out with either isolates of predominantlyOstertagia ostertagi, pureO. leptospicularis or a mixed isolate of equal numbers of both these species. The total worms established on day 21 for the mixed species from a total inoculum of 100000 infective larvae, was 1.2 times greater than from 100000 larvae of theO. ostertagi isolate and 3.3 times that of the pureO. leptospicularis isolate. The increased establishment in the mixed inoculum referred to bothO. ostertagi andO. leptospicularis (days 17 and 21). These differences were both highly significant (P〈0.01). The severity of the pathological changes was also greater in the mixed infections. It is suggested that these findings must be taken into account when control measures involving alternate grazing of sheep and cattle are being employed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00927133
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