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  • 1990-1994  (3)
  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 5263-5265 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A regime for growing high-quality GaAs/AlGaAs single-quantum-well structures by molecular-beam epitaxy with interruption only at the AlGaAs-on-GaAs heterointerface is reported. For 15- and 20-nm-wide wells the luminescence linewidth is found to be 0.44 and 0.29 meV, respectively. The data are among the lowest values reported to date. Photoluminescence line splitting due to the formation of extended growth islands was not observed.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 2214-2216 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Exciton-photon mode interaction of In0.1Ga0.9As quantum wells (QWs) in a λ/2 microcavity has been studied using classical linear dispersion theory. In a system consisting of a GaAs cavity with one QW surrounded by Al0.3Ga0.7As/AlAs and GaAs/AlAs Bragg reflectors grown by molecular beam epitaxy, the interaction is found to be strongest at the ends of the cavity and is vanishing in the center of it. The behavior in the center position is changed by inserting a second QW into the cavity. Reflectance and photoluminescence measurements show modulation effects by QW absorption in accordance with the calculations.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1439-0973
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Der Einfluß der Sepsis durch grampositive Bakterien auf den Stoffwechsel zirkulierender Lipide wurde bei Ratten untersucht. Die Tiere erhielten nüchtern entweder physiologische Kochsalzlösung oder durch Erhitzen abgetötete oder lebensfähigeStaphylococcus aureus-Keime. Nach 18 h wurde eine Erhöhung der Körpertemperatur festgestellt; bei der mit hitzeinaktivierten Bakterien injizierten Gruppe bestand im Vergleich zur Kontrollgruppe eine Erniedrigung von Albumin und Ketonkörpern im Blut. Weitere Unterschiede ergaben sich bei der Gruppe, der lebende Bakterien injiziert worden waren. Triglyzeride und freies Cholesterin im Serum waren erhöht, die Spiegel an verestertem Cholesterin waren erniedrigt, diein vitro bestimmte Aktivität der Lipoproteinlipase und der hepatischen Lipase im Zwerchfell, Herz und Fettgewebe war auffallend erniedrigt. Die Abnahme der lipolytischen Aktivität trat unabhängig davon ein, ob sie an Emulsionen aus langkettigen oder mittelund langkettigen Triglyzeriden bestimmt wurde. Allerdings war die Aktivität bei mittel- und langkettigen Triglyzeriden immer höher als bei langkettigen Triglyzeriden. Dies spricht dafür, daß bei Infektion durch grampositive Bakterien exogen zugeführtes Fett in Form von mittelkettigen Triglyzeriden leichter verarbeitet wird.
    Notes: Summary To study the influence of a gram-positive sepsis on the metabolism of circulating lipids, fasted rats were injected with saline (control group) or with a suspension of heat-killed or liveStaphylococcus aureus. 18 h later, body temperature was increased, while albuminemia and ketonemia were decreased in the group injected with heat-killed bacteria, as opposed to the control group. Passing from these groups to the group injected with live bacteria, more differences appeared: increase of triglyceridemia and free cholesterolemia; decrease of esterified cholesterol levels and especially of thein vitro activity of diaphragm, heart and adipose tissue lipoprotein lipase and of hepatic lipase. The decrease of lipolytic activities occurred whether they were measured on a fat emulsion containing long-chain or medium- and long-chain triglycerides. The fact that for the latter the activity was always higher than for the former suggests that the host infected with gram-positive bacteria would clear exogenous fat more easily in the case of medium-chain triglycerides.
    Type of Medium: Electronic Resource
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