16 research outputs found

    Wie arbeiten Schüler in den naturwissenschaftlichen Fächern ? : Lernforschung in der Schule und im Schülerlabor Biologie als Grundlage zukünftiger Schulentwicklung

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    Wissenschaftsmethodische Kompetenzen und ein wissenschaftstheoretisches Verständnis der Naturwissenschaften sind Teil einer naturwissenschaftlichen Bildung. Ob Schülerinnen und Schüler diese Kompetenzen bis zum Ende ihrer Schullaufbahn überhaupt entwickeln ist aber weitgehend unbekannt. Am Institut für Biologiedidaktik arbeitet seit 2001 die Arbeitsgruppe „Wissenschaftliche Arbeitsweisen im Biologieunterricht“ an dem Ziel, aus der Sicht der Fachdidaktik Biologie grundlegende Variablen des naturwissenschaftlichen Arbeitsprozesses bei Schülern zu identifizieren, modellhaft abzubilden und theoretisch zu fassen. Ein wichtiges Instrument war dabei – neben der Feldforschung – die Einrichtung eines Schüler-Labors zur Erforschung von Schülergruppen unter standardisierten Bedingungen

    Mutations at positions 186 and 194 in the HA gene of the 2009 H1N1 pandemic influenza virus improve replication in cell culture and eggs

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    Obtaining suitable seed viruses for influenza vaccines poses a challenge for public health authorities and manufacturers. We used reverse genetics to generate vaccine seed-compatible viruses from the 2009 pandemic swine-origin influenza virus. Comparison of viruses recovered with variations in residues 186 and 194 (based on the H3 numbering system) of the viral hemagglutinin showed that these viruses differed with respect to their ability to grow in eggs and cultured cells. Thus, we have demonstrated that molecular cloning of members of a quasispecies can help in selection of seed viruses for vaccine manufacture

    Human RNA Polymerase I-Driven Reverse Genetics for Influenza A Virus in Canine Cells ▿

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    We have established a human RNA polymerase I (pol I)-driven influenza virus reverse genetics (RG) system in the Madin-Darby canine kidney 33016-PF cell line, which is approved for influenza vaccine manufacture. RNA pol I polymerases are generally active only in cells of species closely related to the species of origin of the polymerases. Nevertheless, we show that a nonendogenous RNA pol I promoter drives efficient rescue of influenza A viruses in a canine cell line. Application of this system allows efficient generation of virus strains and presents an alternative approach for influenza vaccine production

    Computational methods for the Fourier analysis of sparse high-dimensional functions.

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    A straightforward discretisation of high-dimensional problems often leads to a curse of dimensions and thus the use of sparsity has become a popular tool. Efficient algorithms like the fast Fourier transform (FFT) have to be customised to these thinner discretisations and we focus on two major topics regarding the Fourier analysis of high-dimensional functions: We present stable and effective algorithms for the fast evaluation and reconstruction of multivariate trigonometric polynomials with frequencies supported on an index set.I&sub
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