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  • Springer  (65)
  • American Association for the Advancement of Science (AAAS)  (9)
  • 2005-2009  (53)
  • 1965-1969  (21)
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  • 1
    Electronic Resource
    Electronic Resource
    Derivation of a model for the human eye-positioning mechanism (1967)
    Springer
    Bulletin of mathematical biology 29 (1967), S. 153-174 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF02476968
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  • 2
    Electronic Resource
    Electronic Resource
    Eine Transformation in Räumen verallgemeinerter Funktionen (1969)
    Springer
    Monatshefte für Mathematik 73 (1969), S. 422-432 
    Details
    ISSN: 1436-5081
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01316663
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  • 3
    Electronic Resource
    Electronic Resource
    Über die Approximationsmaße spezieller singulärer Integrale (1969)
    Springer
    Computing 4 (1969), S. 153-159 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF02234762
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  • 4
    Electronic Resource
    Electronic Resource
    Das optische Emissionsvermögen des Titans (1967)
    Springer
    The European physical journal 198 (1967), S. 201-204 
    Details
    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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01326906
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  • 5
    Electronic Resource
    Electronic Resource
    Zur Feldemission der Metalle Titan, Zirkon und Hafnium (1969)
    Springer
    The European physical journal 229 (1969), S. 102-108 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF02112269
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  • 6
    Electronic Resource
    Electronic Resource
    Studies on the multiplication of lactic dehydrogenase elevating agents (1965)
    Springer
    Cellular and molecular life sciences 21 (1965), S. 270-270 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Résumé Observations sur la multiplication de deux particules différentes de virus dans le sérum de la sour's après infection par l'agent de LDH. Le fait que la grande particule a disparu du sérum sept semaines après l'infection suggère que la petite particule est responsable de la virémie persistante et du taux élevé de l'enzyme dans le sang des animaux infectés.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02297020
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  • 7
    Electronic Resource
    Electronic Resource
    The localisation of acid phosphatase activity changes in lysosomes in the adrenal zona fasciculata of intact and hypophysectomized rats following ACTH administration (1967)
    Springer
    Histochemistry and cell biology 10 (1967), S. 321-328 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In the cells of the zona fasciculata of intact adult rats lysosomes can be found in medium amounts, measuring 0.2–0.4 μ in diameter. After treatment with ACTH, the lysosomes in the zona fasciculata of the intact animals increase in number and size, and lysosome-lipid conglomerates are formed. In hypophysectomized animals, the lysosomes in the zona fasciculata decrease in number and size in proportion to the time elapsed. Treatment with ACTH given 2 to 4 weeks after hypophysectomy, resulted in the increase in number and size of the lysosomes. Under such circumstances lysosomes appear in conspicuously large numbers around lipid droplets, which frequently coalesce with them. The possible role of lysosomes is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00304314
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  • 8
    Electronic Resource
    Electronic Resource
    Histological and histochemical studies of the cells of the human foetal adrenal and hypophysis in tissue culture (1967)
    Springer
    Histochemistry and cell biology 9 (1967), S. 78-83 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The histological and histochemical changes taking place in expiants and outgrowing cells of the human foetal adrenals and hypophyses have been studied on the 5th, 10th, 20th, and 28th day of the culture period. In the outgrowth from adrenals, both the epithelial-type and the fibroblast-type cells contain 3β-ol steroid dehydrogenase activity. The cells growing out from hypophyseal expiants appear to be morphologically undifferentiated. Expiants contain differentiated cells in the first 10 to 13 days of the culture period.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00281809
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  • 9
    Electronic Resource
    Electronic Resource
    Untersuchungen an synthetischem Hydroxylapatit im Hinblick auf den Knochenstoffwechsel von Calcium, Strontium, Barium und Radium (1968)
    Springer
    Radiation and environmental biophysics 5 (1968), S. 55-65 
    Details
    ISSN: 1432-2099
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Description / Table of Contents: Zusammenfassung Das zeitliche Verhalten inkorporierter radioaktiver Erdalkalien im Knochen wird in einer Kette von Mechanismen durch das langsamste Glied bestimmt. Dieses ist durch den Austausch der anorganischen Knochenkristallite mit der umgebenden Lösung gegeben. An Hand einer Suspension von Hydroxylapatitkristalliten wird versucht, der Potenzfunktion als Retentionsfunktion der Erdalkalien im Knochen ein physikalisches Bild zugrunde zu legen. Sie ergibt sich aus einer Überlagerung von Reaktionen erster Ordnung infolge einer Verteilung von Bindungsenergien der Ionen an die Oberfläche der Kristallite.
    Notes: Summary Influenced by a chain of mechanisms the time course of incorporated radioactive alkaline earths in bone is determined by the slowest link. This is given by the exchange of the anorganic crystals of bone with the surrounding solution. Using a suspension of hydroxyapatite crystals there is tried to explain the power function as a mathematical description of retention of alkaline earths in bone in physical terms. It results from superimposing first order reactions caused by a distribution of binding energies of the ions to the crystal surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01388132
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  • 10
    Electronic Resource
    Electronic Resource
    Untersuchungen an synthetischem Hydroxylapatit im Hinblick auf den Knochenstoffwechsel von Calcium, Strontium, Barium und Radium (1968)
    Springer
    Radiation and environmental biophysics 5 (1968), S. 42-54 
    Details
    ISSN: 1432-2099
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Description / Table of Contents: Zusammenfassung Das System Hydroxylapatitkristallite in einer geeigneten Lösung stellt in gewisser Hinsicht einin vitro-Analogon für den Knochenstoffwechsel der Erdalkalien dar. Es wird über Versuche berichtet, Unterschiede im Verhalten von Ca, Sr, Ba und Ra in synthetischem Hydroxylapatit festzustellen. Dazu wurden die Diskriminierungsfaktoren von Ca gegen Sr, Ba und Ra bei der Herstellung der Kristallite gemessen. Weiterhin wurde der Austausch der Erdalkalien zwischen vorgefertigten Kristalliten und einer geeigneten Lösung über eine Zeitdauer von 1000 h verfolgt. Die Diskriminierungsfaktoren nehmen mit zunehmender Ionengröße in der Reihenfolge Sr, Ba, Ra zu. Während Sr, Ca-Ionen auch im Inneren der Kristallite ersetzen kann, sind Ba und Ra fast ausschließlich auf die Oberfläche beschränkt. Für die Diskriminierung des Gesamtknochens muß angenommen werden, daß zusätzliche Prozesse eine Rolle spielen.
    Notes: Summary The system hydroxyapatite crystals in a proper solution, in a way, represents anin vitro analogue to metabolism of alkaline earths in bone. Experiments are described to find differencies in the behaviour of Ca, Sr, Ba and Ra to synthetic hydroxyapatite crystals. Synthesizing the crystals the discrimination ratios of Ca to Sr, Ba and Ra were measured. Furthermore the exchange of alkaline earths between preformed crystals and a proper solution was studied over a period of 1000 h. The discrimination ratios grow larger with increasing ionic radius in the order Sr, Ba, Ra. While Sr can replace Ca ions also in the interior of the crystals, Ba and Ra are limited to crystal surface. With respect to the discrimination of bone it must be concluded that further processes participate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01388131
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