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Digitale Medien

Reproductive and immune responses to photoperiod and melatonin are linked in Peromyscus subspecies (1996)

Demas, G. E. ; Klein, S. L. ; Nelson, R. J.

Springer

Journal of comparative physiology 179 (1996), S. 819-825

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ISSN: 1432-1351

Schlagwort(e): Seasonality ; Rhythms ; Breeding ; Pineal ; Immunity

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie , Medizin

Notizen: 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.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00207360

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Digitale Medien

Zur adsorption flexibler Makromoleküle an Oxidgrenzflächen (1988)

Heublein, G. ; Hortschansky, P. ; Klein, S.

Weinheim : Wiley-Blackwell

Acta Polymerica 39 (1988), S. 117-121

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ISSN: 0323-7648

Schlagwort(e): Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Physik

Beschreibung / Inhaltsverzeichnis: 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.

Notizen: 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.

Zusätzliches Material: 1 Ill.