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  • 1
    Publikationsdatum: 1978-04-28
    Beschreibung: Multicellular masses of the cellular slime mold Dictyostelium discoideum, under conditions which ordinarily suppress cell differentiation, develop clusters of stalk cells and spore cells when implanted with Sephadex particles that had been soaked in 5 X 10(-3)M cyclic adenosine monophosphate (AMP). A possible relation exists between oxygen gradients, cyclic AMP gradients, and the pattern of morphogenesis and cell differentiation during fruiting.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Feit, I N -- Fournier, G A -- Needleman, R D -- Underwood, M Z -- New York, N.Y. -- Science. 1978 Apr 28;200(4340):439-41.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/205945" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Cell Differentiation/drug effects ; Cyclic AMP/*pharmacology ; Dictyostelium/*cytology ; Morphogenesis/drug effects ; Myxomycetes/*cytology
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Applied physics 14 (1977), S. 99-115 
    ISSN: 1432-0630
    Schlagwort(e): 42.10
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract Various factors that can effect thermal blooming in stagnation zone situations are examined, including stagnation-zone motion, longitudinal air motion in the neighborhood of the stagnation zone, and the effects of scenario noncoplanarity. Of these effects, only the last offers reasonable hope of reducing the strong thermal blooming that normally accompanies stagnation zones; in particular, noncoplanarity should benefit multipulse more than cw beams. The methods of treating nonhorizontal winds hydrodynamically for cw and multipulse steady-state sources are discussed. Aspects of pulse “self-blooming” are also considered.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    Applied physics 10 (1976), S. 129-160 
    ISSN: 1432-0630
    Schlagwort(e): 42.10
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract The computation of time-dependent three-space-dimensional laser beam propagation is described. The methods are applicable to the propagation of high energy laser beams through the atmosphere in the presence of a horizontal wind and turbulence for most situations of interest. Possible cases are propagation of cw beams through stagnation zones, multi-pulse propagation, including the self-consistent treatment of pulse self-blooming, and propagation involving transonic slewing. The solution of the Maxwell wave equation in Fresnel approximation is obtained by means of a discrete Fourier transform method, which, surprisingly, gives excellent results for diffraction problems. The latter provide a stringent test for the accuracy of any solution method. Considerable use is also made of discrete Fourier transform methods in solving the hydrodynamic equations. The treatment of turbulence is based on the generation of random phase screens at each calculation step along the propagation path. In a time-dependent calculation the random phase screens can be either made to move with the wind at a given propagation position or generated anew for each successive time.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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