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  • 1970-1974  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Cell communication: A cyclic-AMP mediated phenomenon (1974)
    Springer
    The journal of membrane biology 19 (1974), S. 253-266 
    Details
    ISSN: 1432-1424
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Summary Incubation of the salivary glands of the larvae ofDrosophila hydei in a control medium containing 2×10−3 m cyclic adenosine monophosphate (cAMP) induces a considerable increase in passive electrical cel communication. This is caused by a decrease in permeabilty of the nonjunctional membrane part, together with an increase of the permeability of the low-resistance junctions. Similar changes in intercellular communication in the salivary gland ofDrosophila hydei were seen in a majority of experiments in which 10−3 m dibutyryl cycli adenosine monophosphate (dBcAMP), 5×10−3 m theophylline or ecdysterone (100 μg/ml) were added to the control medium. Hyperpolarization of the gland cells can be observed concomitant with the increase in communication. A hypothesis is discussed for a possible molecular regulation of passive electrical cell communication in which the intracellular cAMP level plays a significant part.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01869981
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Satellite lines in the solar X-ray spectrum (1971)
    Springer
    Solar physics 18 (1971), S. 474-488 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Observations of solar X-ray line emission using crystal spectrometers during a large chromospheric flare have provided a list of wavelengths with a precision of 0.003 Å in first order of diffraction and correspondingly better in higher orders. In addition to the resonance, intersystem (1 1 S 0-2 3 P 1) and forbidden (1 1 S 0-2 3 S 1) transitions of ions of the Hei isoelectronic sequence, we have recorded satellite lines arising from ions in the Lii, Bei and Bi isoelectronic sequences. These satellite features are most prominent in the iron spectrum. Apparent decreases in the ratio of forbidden and intersystem line intensities of Mgxi and Sixiii during the flare are used to derive electron densities possibly as high as 1 × 1013 cm−3 in the Mgxi emitting region and 1 × 1014 cm−3 in the Sixiii region during the event. A search for satellite lines on the long-wavelength side of the Lyman-alpha line of Hi-like ions has yielded no positive identifications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00149069
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    CPM-Cost: Ein parametrischer Dekompositionsalgorithmus (1972)
    Springer
    Mathematical methods of operations research 16 (1972), S. B145 
    Details
    ISSN: 1432-5217
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Description / Table of Contents: Summary The purpose of this treatment is to present the application of theDantzig/Wolfe decomposition principle to the problem of generating project cost curves.
    Notes: Zusammenfassung Es wird das Problem der Zeit-Kosten-Analyse als lineares parametrisches Optimierungsproblem formuliert und ein Lösungsverfahren auf der Grundlage des Dekompositionsprinzips vonDantzig undWolfe entwickelt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01959721
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Ein Lösungsansatz für ein spezielles zweistufiges stochastisches Optimierungsproblem (1973)
    Springer
    Mathematical methods of operations research 17 (1973), S. 119-128 
    Details
    ISSN: 1432-5217
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Description / Table of Contents: Summary For the problem of two-stage programming under uncertainty with a special structure of the second stage program and only random variables with discrete distribution function, by using theDantzig/Wolfe decomposition principle, an algorithm is presented.
    Notes: Zusammenfassung Für das zweistufige stochastische Optimierungsproblem wird, unter der Voraussetzung, daß das Notprogramm eine bestimmte Struktur hat und die Zufallsvariablen einer diskreten Verteilungsfunktion gehorchen, durch Dualisierung des Problems ein Lösungsansatz auf der Basis des Dekompositionsprinzips vonDantzig undWolfe entwickelt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01956856
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    Paper (German National Licenses)
    Fulltext
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