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  • Springer  (107)
  • National Academy of Sciences  (10)
  • 1990-1994  (94)
  • 1965-1969  (23)
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  • 1
    Publication Date: 1992-06-15
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of mathematical biology 29 (1967), S. 153-174 
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract A model for the human eye-movement mechanism is derived. The derivation is based on a literature search directed toward identifying and mathematically describing each component through physiological and anatomical considerations. It is felt that although certain parameter values may not be exactly correct (for the data were taken from a wide variety of animals), we can place a great deal of confidence in the configuration.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Mathematik 73 (1969), S. 422-432 
    ISSN: 1436-5081
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Computing 4 (1969), S. 153-159 
    ISSN: 1436-5057
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Summary The author investigates the principal asymptotic expansion of the measure of approximation of particular singular integrals having a non-negative kernel with respect to the approximation of continuous, 2π-periodic functions belonging to theLipschitz classes Lip 2 * 1 (or Lip1 1) and Lip 2 * 2. A simple connection between the measure of approximation of a singular integral and the moments of the corresponding kernel enables one to calculate these expansions in an elementary way using the associated convergence factors. Thereby a more precise comparison of the quality of approximation by various kernels is possible. In particular the first generalized kernel ofJackson andFejér's kernel are considered.
    Notes: Zusammenfassung In dieser Arbeit werden wesentliche asymptotische Entwicklungen für Approximationsmaße spezieller trigonometrischer singulärer Integrale mit nicht-negativem Kern bezüglich der Approximation von stetigen, 2π-periodischen Funktionen, die zu denLipschitz-klassen Lip 2 * 1 (bzw. Lip1 1) und Lip 2 * 2 gehören, aufgestellt. Ein einfacher Zusammenhang zwischen den Approximationsmaßen eines singulären Integrals und den Momenten des entsprechenden Kernes erlaubt unter Verwendung der zugehörigen Konvergenzfaktoren eine elementare Berechnung dieser Entwicklungen, die einen weitergehenden Vergleich der Approximationsgüte verschiedener Kerne erlauben. Insbesondere wird der erste verallgemeinerte Kern vonJackson und der Kern vonFejér untersucht.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 198 (1967), S. 201-204 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The spectral emissivity of titanium has been measured over a temperature range from 1100 °K to approximately the melting point. Discrepancies in the data as reported by several authors are discussed with respect to the surface conditions of the metal investigated.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 229 (1969), S. 102-108 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The field emission of titanium, zirconium, and hafnium single crystals has been investigated. The patterns were found to agree with those obtained by clean tungsten and rhenium emitters.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 46 (1990), S. 472-474 
    ISSN: 1420-9071
    Keywords: Endotoxin ; fatty acid ; phospholipid ; BCG
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The effects of endotoxin on mouse liver phospholipid fatty acid composition have been investigated. Administration of endotoxin fromSalmonella abortus equi led to a decrease in the polyunsaturated fatty acid content of livers from mice sensitized with Bacille Calmette Guérin (GCG). The content of arachidonic acid fell significantly in both the phosphatidylcholine and phosphatidylinositol fractions whereas in the phosphatidylethanolamine fraction the linoleic acid content was significantly reduced. The polyunsaturated fatty acids were replaced by increased amounts of oleic acid and palmitic acid, leading to a reduction in the polyunsaturated to saturated fatty acid ratio.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
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  • 9
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract We previously reported that the presence of the bacterial (Vitreoscilla) hemoglobin gene enhances alpha-amylase production in recombinant Escherichia coli strain MK79. Using the growth of MK79 on starch as a selective method we have produced a mutant strain (BSC9) that produces up to four times as much alpha-amylase as MK79. Both MK79 and BSC9 produce the most alpha-amylase (per cell and per milliliter) in the stationary phase; almost all of the enzyme is intracellular in both strains. Modification of the standard alpha-amylase assay increases the amount of amylase detected about sixfold. BSC9 has about five to nine times as many copies per cell as MK79 of the recombinant plasmid, which carries both the amylase and hemoglobin genes, but both strains produce about the same amount of hemoglobin. While MK79 respiration decreases upon going from log to stationary phase, BSC9 respiration increases during the same period. The two latter results may be of particular importance in determining the way in which hemoglobin enhances the production of cloned protein products in recombinant bacteria.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular evolution 38 (1994), S. 250-262 
    ISSN: 1432-1432
    Keywords: Opsin ; Visual pigments ; Gene family ; Evolution ; Phylogeny ; Spectral sensitivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Phylogenetic and physiological methods were used to study the evolution of the opsin gene family in Drosophila. A phylogeny based on DNA sequences from 13 opsin genes including representatives from the two major subgenera of Drosophila shows six major, well-supported clades: The “blue opsin” clade includes all of the Rhl and Rh2 genes and is separated into two distinct subclades of Rhl sequences and Rh2 sequences; the ultraviolet opsin clade includes all Rh3 and Rh4 genes and bifurcates into separate Rh3 and Rh4 clades. The duplications that generated this gene family most likely took place before the evolution of the subgenera Drosophila and Sophophora and their component species groups. Numerous changes have occurred in these genes since the duplications, including the loss and/or gain of introns in the different genes and even within the Rhl and Rh4 clades. Despite these changes, the spectral sensitivity of each of the opsins has remained remarkably fixed in a sample of four species representing two species groups in each of the two subgenera. All of the strains that were investigated had R1-6 (Rhl) spectral sensitivity curves that peaked at or near 480 nm, R7 (Rh3 and Rh4) peaks in the ultraviolet range, and ocellar (Rh2) peaks near 420 nm. Each of the four gene clades on the phylogeny exhibits very conservative patterns of amino acid replacement in domains of the protein thought to influence spectral sen sitivity, reflecting strong constraints on the spectrum of light visible to Drosophila.
    Type of Medium: Electronic Resource
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