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  • Scanning electron microscopy  (2)
  • Breeding  (1)
  • Chemistry  (1)
  • 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
    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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  • 3
    Electronic Resource
    Electronic Resource
    Specimen handling and data interpretation in x-ray microanalysis of frozen hydrated etched gastrointestinal tract (1986)
    New York, NY : Wiley-Blackwell
    Journal of Electron Microscopy Technique 4 (1986), S. 371-379 
    Details
    ISSN: 0741-0581
    Keywords: Scanning electron microscopy ; Low temperature ; Microanalysis ; Duodenum ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Natural Sciences in General
    Notes: Low temperature scanning electron microscopy of mammalian tissue allows microanalysis data and morphological results to be considered together, without the risk of elemental diffusion introduced by liquid fixatives and processing agents. The technique, however, is time consuming and there are many areas where errors are possible and standardization of technique is advisable. The present paper describes some of the problems inherent in handling frozen tissue and comparison is made between microanalytical measurements from luminal contents and those from villous epithelium.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jemt.1060040407
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Biological variation in cryo-microanalytical data from mouse small intestinal villi (1987)
    New York, NY : Wiley-Blackwell
    Journal of Electron Microscopy Technique 5 (1987), S. 65-74 
    Details
    ISSN: 0741-0581
    Keywords: Scanning electron microscopy ; Low temperature ; Microanalysis ; Duodenum ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Natural Sciences in General
    Notes: Microanalysis data obtained using low temperature scanning electron microscopy of frozen hydrated etched mouse duodenum gives information about peak/background ratios of various elements in different cellular compartments. The present paper describes ways in which the data can be analyzed to minimize artifactual variations and to make clear where there are genuine differences in peak/background ratios when readings from different animals are compared. Using these methods, it is shown that in some areas of villous epithelium there are measurable differences in the ratios of sodium, calcium, and sulphur.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jemt.1060050107
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