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  • Springer  (105)
  • Cell Press  (51)
  • 2005-2009  (67)
  • 2000-2004  (66)
  • 1965-1969  (23)
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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
    Adaption of Sprague Dawley rats to long-term feeding of high fat of high fructose diets (2000)
    Springer
    European journal of nutrition 39 (2000), S. 229-234 
    Details
    ISSN: 1436-6215
    Keywords: Key words Glucose intolerance – insulin resistance – fat – fructose – rats
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Notes: Summary Background Present animal models used to emulate type 2 diabetes may not accurately reflect the metabolic changes that occur in humans. Aims of the study The purpose of this research was to evaluate diets reported to induce insulin resistance and impaired glucose metabolism in rats as a potentially useful model for studying type 2 diabets. Methods Three groups of male Sprague Dawley rats (n=7) were fed either a control diet, based on AIN recommendations (53% cornstarch, 10% sucrose and 7% soybean oil), a high fat diet (25% soybean oil, 35% cornstarch) or a high fructose diet (53% fructose, 10% sucrose) for a 3 month period. Glucose tolerance tests were carried out in week 3 and week 9 of the experiment. At the termination of the experiment, serum insulin, glucose, cholesterol and triacylglycerols were measured. Glucose incorporation into glycogen and glycogen synthase activity were measured in soleus muscles. Results Similar weight gain was observed for all three groups of rats. Glucose tolerance curves and fasting glucose levels were not significantly different at any time point in the experiment. Insulin levels were unchanged for the controls (171±21 pM), high fructose (164±16 pM) and high fat (181±30 pM) diets. Fasting serum triacylglycerols and cholesterol levels were not significantly elevated by dietary treatment. In soleus muscles, rats on all three diets had a significant increase in glycogen synthesis in response to insulin, but synthesis was similar in all three groups. Glycogen synthase activity was also not significantly affected by long-term dietary intervention. Conclusions In this study, healthy Sprague Dawley rats fed high fat or high fructose diets for 3 months adapted to the nutritional intervention without developing classical signs of insulin resistance and impaired glucose tolerance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003940070016
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  • 4
    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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  • 5
    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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  • 6
    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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  • 7
    Electronic Resource
    Electronic Resource
    The distribution and abundance of soft-sediment macrobenthos around Casey Station, East Antarctica (2000)
    Springer
    Polar biology 23 (2000), S. 840-850 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Grab samples of shallow (5–35 m) marine benthic sediments and epi- and infaunal assemblages were taken from nearshore regions around Casey Station, Windmill Islands, East Antarctica. A hierarchical, spatially nested sampling design was used with locations (kilometres apart), sites (hundreds of metres apart) and plots (tens of metres). Two potentially impacted, polluted locations (adjacent to a sewage outfall and an old garbage tip) were compared with two control locations in an asymmetrical design. Significant differences in assemblages were found between locations and between sites within locations. Significant differences in the abundances of taxa at several taxonomic levels (species, family, order, phylum) were found at all three spatial scales. Significant differences were also detected between the polluted and control locations. Compared with other Antarctic locations, the assemblages were dominated by crustaceans (90–97% of individuals) and there was a paucity of polychaete fauna at the locations sampled.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003000000162
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  • 8
    Electronic Resource
    Electronic Resource
    Endwall boundary layer separation in a single-stage axial-flow low-speed compressor and a high-stagger compressor cascade (2000)
    Springer
    Forschung im Ingenieurwesen 65 (2000), S. 217-224 
    Details
    ISSN: 1434-0860
    Source: Springer Online Journal Archives 1860-2000
    Topics: Technology
    Description / Table of Contents: Zusammenfassung Die vorliegende Arbeit beschreibt eine Untersuchung der Strömung am Gehäuse über dem Rotor eines einstufigen Axialverdichters (Absolutströmung) und an der Seitenwand eines zugehörigen Verdichtergitters (simulierte Relativströmung) mit Spalt auf einer Seite. Die auf die Profilsehne bezogene Spaltweite beträgt in beiden Fällen 3%. Ölanstrichbilder von Rotorgehäuse und Gitterseitenwand werden zur Visualisierung und Analyse der Grenzschichten auf den Wänden für eine Reihe von Lieferzahlen bzw. korrespondierenden Zuströmwinkeln herangezogen. Die Ergebnisse ermöglichen die verschiedenen Quellen für eine Verblockung des Seitenwandbereiches zu identifizieren und Änderungen mit der Lieferzahl oder dem Zuströmwinkel zu bestimmen.
    Notes: Abstract The paper describes an investigation of the overtip endwall flow in a single-stage axial-flow low-speed compressor (absolute flow) and in a corresponding compressor cascade (simulated relative flow) with a tip clearance on one side. The clearance to chord ratio is 3% in both cases. Oil flow pictures of the rotor casingwall and cascade endwall are used to visualize and analyse the boundary layers on the walls at various flow rates and corresponding inlet angles, respectively. The results enable the different sources of endwall blockage to be identified and changes with flow rate or inlet angle to be determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100109900019
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  • 9
    Electronic Resource
    Electronic Resource
    Investigation of Hypervelocity Impacts on Retrieved Surfaces by Direct Simulation Monte Carlo (2000)
    Springer
    Space debris 2 (2000), S. 109-121 
    Details
    ISSN: 1572-9664
    Keywords: debris ; impact flux ; meteoroid ; secondary impact
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Hypervelocity impacts on the retrieved Hubble Space Telescope (HST) solar array was investigated by our extended Direct Simulation Monte Carlo (DSMC) model and the result matches well with the measured data in most of the particle mass range. The revelation of the altitude dependence of particles flux onto the retrieved surfaces provides some insight in understanding the observed higher flux onto Mir space station relative to that onto Long Duration Exposure Facility (LDEF). Our analysis suggests that a slightly higher primary flux onto Mir space station would be possible even without taking into account the secondary impacts, as a result of the existence of the highly eccentric orbits of small-sized debris. It is, furthermore, predicted that 43% of the measured impact flux onto Mir station in PIE experiment may be from secondary impacts, and a corresponding 7% for the detectors in Echantillions experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021272408769
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  • 10
    Electronic Resource
    Electronic Resource
    Sequence of PHA synthase gene from two strains of Rhodospirillum rubrum and in vivo substrate specificity of four PHA synthases across two heterologous expression systems (2000)
    Springer
    Applied microbiology and biotechnology 53 (2000), S. 420-429 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract A 3.0-kb genomic fragment has been isolated from Rhodospirillum rubrum (ATCC 25903) that contains an open reading frame (ORF) with strong homology to other known polyhydroxyalkanoate (PHA) synthase genes. This ORF has lower homology to the R. rubrum strain Ha PHA synthase than would be expected within the same species. We have conducted a series of heterologous expression studies evaluating the in vivo substrate specificity of PHA synthase genes from Rhodobacter sphaeroides, Ralstonia eutropha (formerly Alcaligenes eutrophus), Thiocystis violacea, and Nocardia corrallina, within the PHA-synthase-negative hosts, Ralstonia eutropha DSM541 and Pseudomonas putida GpP104. The N. corrallina PHA synthase incorporated the highest percentage of C5 monomers in the polymer when fermented in medium supplemented with 0.1% heptanoate as the sole carbon source. When the T. violacea and R. sphaeroides were expressed in the PHA-negative host DSM541, a greater percentage of C5 monomer was observed in the polymer as compared to the expression of the PHA synthase of R. eutropha, when the transconjugants were fermented in medium supplemented with 0.4% propionate. Evaluation for preference of medium-chain-length monomers demonstrated the flexibility of the N. corrallina, T. violacea, and R. eutropha synthase genes to polymerize a copolyester composed of short- and medium-chain-length monomers when the respective transconjugants were fermented in medium supplemented with 0.5% octanoate. These studies demonstrate that the PHA synthase from N. corrallina, T. violacea, and R. eutropha are able to polymerize a copolyester composed of short- and medium-chain-length monomers, while the PHA synthase from R. sphaeroides lacks this ability and only produces a short-chain-length polymer. These observations suggest that the composition of the PHA from the PHA-producing organisms does not necessarily reflect the inherent specificity of the PHA synthase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530051636
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