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  • 1
    Electronic Resource
    Electronic Resource
    Reproductive and immune responses to photoperiod and melatonin are linked in Peromyscus subspecies (1996)
    Springer
    Journal of comparative physiology 179 (1996), S. 819-825 
    Details
    ISSN: 1432-1351
    Keywords: Seasonality ; Rhythms ; Breeding ; Pineal ; Immunity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The effects of photoperiod and melatonin treatment on reproductive and immune function were assessed in two subspecies of Peromyscus maniculatus from different latitudes of origin. In experiment 1, P. m. bairidii (latitude = 42°51′ N) and P. m. luteus (latitude = 30°37′ N) were housed in either long (LD 16∶8) or short days (LD 8∶16) for 8 weeks. Short-day P. m. bairdii displayed reproductive regression and elevated splenocyte proliferation in response to the T-cell mitogen concanavalin A, as compared to long-day mice. In contrast, P. m. luteus did not undergo reproductive regression or exhibit any increase in lymphocyte proliferation in short days. In experiment 2, individuals of both P. m. bairdii and P. m. luteus were implanted with empty capsules or capsules that contained melatonin. Individual P. m. bairdii implanted with melatonin underwent reproductive regression. Individuals of this subspecies also displayed elevated lymphocyte proliferation compared to control mice. Conversely, P. m. luteus implanted with melatonin did not undergo reproductive regression and displayed no significant changes in lymphocyte proliferation. These results suggest that reproductive responsiveness to melatonin mediates short-day enhancement of immune function in deer mice. These data also imply that melatonin may not possess universal immunoenhancing properties. Rather, the effectiveness of melatonin to influence immune responses may be constrained by reproductive responsiveness to this indole-amine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00207360
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Complexity aspects of guessing prefix codes (1994)
    Springer
    Algorithmica 12 (1994), S. 409-419 
    Details
    ISSN: 1432-0541
    Keywords: Prefix codes ; Huffman codes ; Encryption ; Complexity ; NP-completeness
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract Given a natural language cleartext and a ciphertext obtained by Huffman coding, the problem of guessing the code is shown to be NP-complete for various variants of the encoding process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01185434
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Is Huffman coding dead? (1993)
    Springer
    Computing 50 (1993), S. 279-296 
    Details
    ISSN: 1436-5057
    Keywords: Data compression ; Huffman codes ; arithmetic codes ; cooling theory ; information storage ; text compression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung In neueren Publikationen über Datenkompression werden oft arithmetische Codes anstatt der gebräuchlicheren Huffman-Codes als Stand der Wissenschaft vorgeschlagen. Obwohl Huffman-Codes nicht unter allen Umständen optimal sind, zeigen wir, daß der Vorteil arithmetischer Codes zur Kompression häufig vernachlässigbar klein ist. Unter Berücksichtigung auch anderer Kriterien schließen wir, daß für viele Anwendungen Huffman-Codes auch weiterhin eine gute Alternative darstellen.
    Notes: Abstract In recent publications about data compression, arithmetic codes are often suggested as the state of the art, rather than the more popular Huffman codes. While it is true that Huffman codes are not optimal in all situations, we show that the advantage of arithmetic codes in compression performance is often negligible. Referring also to other criteria, we conclude that for many applications, Huffman codes should still remain a competitive choice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02243872
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  • 4
    Electronic Resource
    Electronic Resource
    Zur adsorption flexibler Makromoleküle an Oxidgrenzflächen (1988)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 39 (1988), S. 117-121 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The adsorption behaviour of PVAC and copolymers of VAC and 10% and 4% acrylic acid, respectively, at SiO2, Al2O3, Fe2O3, TiO2, MgO and CaO is investigated. The copolymers principially exhibit a stronger adsorption tendency increasing from the more acidic SiO2 to the stronger basic CaO. The results follow the acid-base theory of Fowkes for the interpretation of interaction forces at composite interfaces.
    Notes: Die Adsorption von PVAC sowie Copolymeren mit 10 bzw. 4% Acrylsäureanteilen an SiO2, Al2O3, Fe2O3, TiO2, MgO und CaO wird untersucht. Die Copolymere zeigen generell eine stärkere Adsorptionsneigung, die vom sauren SiO2 zum am stärksten basischen CaO zunimmt. Die Ergebnisse lassen sich in die Säure-Base-Theorie nach Fowkes zur Beschreibung der Wechselwirkungskräfte in Verbundgrenzflächen einordnen.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1988.010390305
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    Paper (German National Licenses)
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