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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 8 (1996), S. 2847-2854 
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this study we examine laminar velocity profiles of freely suspended flowing soap films. We introduce a new device which supports large uniform films for indefinite periods of time. The geometry of the flow is two-dimensional (2D), yet the measured velocity profiles depart from ideal 2D behavior. The main reason for this departure is that the soap film experiences an air drag force across its entire surface. Describing the air with Prandtl boundary layer theory, we predict the observed flow patterns with good accuracy. The downstream development of the profiles is self similar. Our models set an apparent upper limit on the film 2D viscosity of 5⋅10−6 surface poise for dilute soap concentrations. This measurement implies that the surfactant layers on the film may not contribute measurably to the 2D viscosity. For higher soap and glycerol concentrations the opposite appears to be true. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 138 (1996), S. 0 
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract An iron containing Superoxide dismutase from the cytosol of the thermoacidophilic crenarchaeon Sulfolobus acidocaldarius (DSM 639) has been purified to electrophoretic homogeneity. It comprises at least 11% of the cytosolic protein. The isolated protein consists of two identical subunits with an apparent molecular mass of 22.4 kDa. It contains one iron atom per dimer. The protein shows the typical EPR spectrum of a S = 3 / 2, rhombic high-spin iron center. It is extremely resistant against thermal and chemical denaturation. Simultaneous treatment with heat and detergent resulted in the conversion into a more active tetrameric form. Similar enzymes appear to be present in the cytosol of other members of the Sulfolobaceae. The dimeric form of the protein from S. acidocaldarius has been crystallized.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1398-9995
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The major allergen from birch pollen, Bet v I, and the cross-reacting 18-kDa major allergen from Golden Delicious and Granny Smith apples were isolated by micropreparative SDS-PAGE followed by electroelution. In the case of apples, highly active, low-temperature extracts were used. The purity of the allergens was checked by analytic SDS-PAGE and immunoblotting with allergic patients’ sera, as well as by N-terminal amino acid microsequencing, and the allergens were found to be very pure. The strong immunologic activity of the isolates was determined by the enzyme allergosorbent test (EAST) and EAST inhibition assays; this activity was, in the case of Bet v I, similar to that of a preparation obtained by monoclonal antibody affinity chromatography. The allergenic potency of Bet v I and of the cross-reactive apple allergen was determined by EAST inhibition and dose-related histamine release. With both assay systems, the allergenic reactivity of Bet v I was considerably higher than that of the major apple allergen. Fürthermore, skin prick tests with the purified allergens and with whole allergenic extracts were performed on a group of 33 patients suffering from birch-pollen and apple hypersensitivity, and on a control group of 10 patients. The frequency of positive prick test results in the allergic patient group ranged from 73% for the major allergen from Golden Delicious apples to 97% with Bet v I and whole birch pollen extract, respectively. In contrast to our low-temperature extracts, commercial prick test solutions of four different manufacturers were found to be unreliable for the diagnosis of apple allergy. The skin test results again indicated the strong immunologic activity of the allergen isolates and the predominance of the major allergens in context with birch-pollen and apple hypersensitivity. Taken together, the results support the view that the 18-kDa major allergen represents most of the allergenicity of the the apple fruit, and that all allergenic epitopes of the apple proteins are present on Bet v I.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1436-6215
    Keywords: Pollenallergene ; Lebensmittelallergence ; exotische Früchte ; Kreuzreaktivität ; IgE-Immunoblotting ; Food allergens ; pollen allergens ; cross-reactivity ; exotic fruit ; IgE-immunoblotting
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Zusammenfassung Viele Studien belegen, daß das Phänomen der birkenpollenassoziierten Nahrungsmittelallergie auf spezifische IgE-Antikörper zurückzuführen ist, die primär gegen Birkenpollenallergene gerichtet sind und mit verwandten Proteinen in Obst, Nüssen und Gemüse kreuzreagieren. Wir haben ein neues Muster der Kreuzreaktivität identifiziert, das auf einem 35 kDa - Protein aus Birkenpollen beruht. Es handelt sich um ein Minorallergen der Birke, gegen das ca. 10–15 % der Birkenpollenallergiker spezifische IgE-Antikörper aufweisen. Inhibitionsstudien mit dem Enzymallergosorbens-Test (EAST) und mittels Immunoblot zeigen die Kreuzreaktivität dieses Proteins zu Proteinen vergleichbarer Größe aus Litschi, Mango, Banane, Orange, Apfel, Birne und Karotte. Das 35 kDa-Protein ist immunologisch unabhängig von Bet v 1, dem Hauptallergen der Birke. Dagegen haben wir auch ein Protein mit einer Größe von 34 kDa beobachtet, bei dem es sich vermutlich um ein Bet v 1-Dimer handelt.
    Notes: Summary Food allergies in birch pollen allergic patients have been shown to be due to cross-reactivities of specific IgE antibodies which are directed against birch pollen allergens with related proteins in fruit, nuts and vegetables. We identified a new cross-reactive structure of 35 kDa in birch pollen and some plant food extracts by Enzyme Allergosorbent Test (EAST) and immunoblot inhibition studies. The 35 kDa birch pollen protein is a minor allergen to which approximately 10–15 % of birch pollen allergic individuals have specific IgE. Our data demonstrate that there is cross-reactivity of this protein with proteins of comparable size from lychee, mango, banana, orange, apple, pear and carrot. While the 35 kDa protein is immunologically independent of the major birch pollen allergen Bet v 1, we also observed IgE binding to a 34 kDa structure which appears to be a Bet v 1 dimer.
    Type of Medium: Electronic Resource
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