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  • 1
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 46 (1974), S. 1765-1768 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Annals of combinatorics 4 (2000), S. 299-305 
    ISSN: 0219-3094
    Keywords: Keywords: quantum cohomology, flag manifold, Schubert poynomial, elementary symmetric polynomial, standard elementary monomial
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract. The computation and understanding of quantum cohomology is a very hard problem in mathematical physics (string theory). We review in non-technical terms how, in the case of the flag manifolds, this problem can turn out to be at its core a non-trivial problem in algebraic combinatorics.
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  • 4
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Immunology 21 (2003), S. 177-204 
    ISSN: 0732-0582
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology , Medicine
    Notes: Abstract The IgA receptor family comprises a number of surface receptors including the polymeric Ig receptor involved in epithelial transport of IgA/IgM, the myeloid specific IgA Fc receptor (FcalphaRI or CD89), the Fcalpha/muR, and at least two alternative IgA receptors. These are the asialoglycoprotein receptor and the transferrin receptor, which have been implicated in IgA catabolism, and tissue IgA deposition. In this reviewwe focus on the biology of FcalphaRI (CD89). FcalphaRI is expressed on neutrophils, eosinophils, monocytes/macrophages, dendritic cells, and Kupffer cells. This receptor represents a heterogeneously glycosylated transmembrane protein that binds both IgA subclasses with low affinity. A single gene encoding FcalphaRI has been isolated, which is located within the leukocyte receptor cluster on chromosome 19. The FcalphaRI alpha chain lacks canonical signal transduction domains but can associate with the FcR gamma-chain that bears an activation motif (ITAM) in the cytoplasmic domain, allowing activatory functions. FcalphaRI expressed alone mediates endocytosis and recyling of IgA. No FcalphaRI homologue has been defined in the mouse, and progress in defining the in vivo role of FcalphaRI has been made using human FcalphaRI transgenic (Tg) mice. FcalphaRI-Tg mice demonstrated FcalphaRI expression on Kupffer cells and so defined a key role for the receptor in mucosal defense. The receptor functions as a second line of antibacterial defense involving serum IgA rather than secretory IgA. Studies in FcalphaRI-Tg mice, furthermore, defined an essential role for soluble FcalphaRI in the development of IgA nephropathy by formation of circulating IgA-FcalphaRI complexes. Finally, recent work points out a role for human IgA in treatment of infectious and neoplastic diseases.
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  • 5
    Electronic Resource
    Electronic Resource
    [s.l.] : Macmillian Magazines Ltd.
    Nature 422 (2003), S. 513-515 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In the oceans, heat, salt and nutrients are redistributed much more easily within water masses of uniform density than across surfaces separating waters of different densities. But the magnitude and distribution of mixing across density surfaces are also important for the Earth's climate ...
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  • 6
    ISSN: 1573-482X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Three-layer structures of thick (〉5 μm) films of nanosized titanium dioxide, zirconium dioxide, and carbon have been screen-printed on a semi-production level for use in photosensitized photovoltaic devices. The films have been characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), and nitrogen adsorption/desorption. The rheology of the screen-printing pastes has been measured, and qualitatively matched to the quality of the resultant film. Three titanium dioxide candidates were evaluated for performance. At low light levels (〈300 lux, i.e., typical indoor light levels), photosensitized photovoltaic modules made from these screen-printed structures exhibited equal or superior performance to a commercially available amorphous silicon module.
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  • 7
    ISSN: 1546-1696
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: [Auszug] We constructed an immunotoxin, composed of an antibody directed against the high-affinity IgG receptor CD64 and Ricin-A, with the aim of resolving chronic inflammation through elimination of activated macrophages. In vitro, this immunotoxin proved very efficient in inducing apoptosis in ...
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  • 8
    ISSN: 1546-170X
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] Despite the well-recognized involvement of immunoglobulin (Ig) A in mucosal immunity, the function of its receptor, FcαRI (CD89), is poorly understood. The ability of FcαRI to activate leukocytes seems to conflict with the proposed anti-inflammatory activity of secretory IgA. We show ...
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Geometriae dedicata 79 (2000), S. 101-108 
    ISSN: 1572-9168
    Keywords: real plane ; algebraic curves ; polynomial vector fields ; Hilbert's 16th problem.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract For every nonsingular algebraic curve C of degree m in the real plane a polynomial vector field of degree 2m−1 is constructed, which has exactly the ovals of C as attracting limit cycles. Therefore, every progress on the algebraic part of Hilbert's 16th problem automatically yields progress on its dynamical part.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Journal of ornithology 115 (1974), S. 398-417 
    ISSN: 1439-0361
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Summary From the aut-ecological point of view, the concept “eco-scheme” has been proposed and used for the complex of environment-factors comprising the framework necessary for the existance of a species, and for the overall concept for competition (for a requirement in short supply) and for interference (as direct confrontation) the expression “rivalry” has been proposed and used. “Dismigration” is to be understood as including all active movements which lead to a change in dispersion (as the status of spatial separation between individuals of a population). The mentioned eco-ethological dispersion factors are characterised by the fact that both environmental and behavioural elements interact within them. This paper investigates what influence the eco-ethological factors of eco-scheme, rivalry and dismigration exert on the dispersion of individuals within a population. On the basis of results the three following eco-ethological dispersion principles are drawn up: (a) Individuals or pairs of a species choose as resident or breeding grounds only habitats or biotopes in which the species-specific eco-scheme is realised. Where there is a choice, the habitat in which the monotop of this species has been most adequately achieved is preferred. (b) Individuals or pairs of a species may be influenced in their dispersion by intra- or inter-specific competition and/or interference i.e. individuals subordinate in rivalry have to give space (unless they do without the requirement in question). (c) Dismigration of individuals operate in a change in the dispersion of population; these active movements are species-specific quantitatively and qualitatively. Studies of the complex effect of the three stated factors indicated these as the most important eco-ethological factors in dispersion. With the help of six examples from studies of woodland hole-breeders in an area of south-east Lower Saxony near Braunschweig, the influence of eco-scheme, rivalry and dismigration on the breeding season dispersion of these species is demonstrated (Fig. 1–6).
    Notes: Zusammenfassung Für den Komplex des Umwelt-Faktorengefüges, das für die Existenz einer Art notwendig ist, wird aus autökologischer Sicht der Begriff „Ökoschema“ und als Überbegriff für Konkurrenz (um ein begrenzt vorhandenes Requisit) und Interferenz (als direkte Konfrontation) der Ausdruck „Rivalität“ vorgeschlagen und verwendet. Unter „Dismigration“ sind sämtliche aktiven Ortsbewegungen zu verstehen, die zu einer Änderung der „Dispersion“ (als Zustand der Individuenverteilung im Raum) führen. Die genannten „öko-ethologischen“ Dispersionsfaktoren sind dadurch gekennzeichnet, daß in ihnen sowohl Umweltgegebenheiten als auch Verhaltensweisen zusammenwirken. In der vorliegenden Arbeit wird untersucht, welchen Einfluß die öko-ethologischen Faktoren Ökoschema, Rivalität und Dismigration auf die Dispersion der Individuen in einer Population ausüben. Anhand der Ergebnisse werden die folgenden drei öko-ethologischen Dispersions-Grundsätze aufgestellt: a) Individuen bzw. Paare einer Art wählen als Aufenthalts- oder Brutgebiete nur Land-schaftsformen bzw. Biotope, in denen das artspezifische Ökoschema verwirklicht ist; bei Auswahlmöglichkeit wird dasjenige Habitat bevorzugt, in welchem der Monotop dieser Art relativ am besten ausgeprägt ist. b) Individuen bzw. Paare einer Art können durch intra- bzw. interspezifische Konkurrenz und/oder Interferenz in ihrer Dispersion beeinflußt werden, d. h. durch Rivalität unterlegene Individuen müssen weichen (sofern sie nicht auf das jeweilige Requisit verzichten). c) Dismigrationen von Individuen führen zu Änderungen der popularen Dispersion; diese aktiven Ortsbewegungen sind in ihrem quantitativen und qualitativen Ausmaß artspezifisch. Die Betrachtungen über die Komplexwirkung der drei genannten Faktoren ließen diese als die wichtigsten Dispersionsfaktoren öko-ethologischer Art erkennen. Anhand von sechs Beispielen aus Untersuchungen an waldbewohnenden Höhlenbrütern im südost-niedersächsischen Raum bei Braunschweig wird der Einfluß von Ökoschema, Rivalität und Dismigration auf die brutzeitliche Dispersion dieser Arten aufgezeigt.
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