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  • Dipole moments  (1)
  • Glycine max (L.) Merr.  (1)
  • Springer  (2)
  • American Chemical Society
  • American Physical Society
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  • Springer  (2)
  • American Chemical Society
  • American Physical Society
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  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Journal of computer-aided materials design 1 (1993), S. 97-110 
    ISSN: 1573-4900
    Schlagwort(e): Partial atomic charge ; Electrostatic induction ; Atomistic simulation ; Polarizability ; Dipole moments ; Fluorocarbons ; Poly(vinylidenefluoride)
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Summary A scheme is presented for periodically updating atom-centered partial charges due to changing local electric fields that arise during the course of a molecular simulation. The effects of electrostatic induction, due to polarization of the local electron density of bonded atom pairs, are realized through the approximation of the bond polarizability tensor as being cylindrically symmetric and directed along the bond axis, with negligible lateral polarizability. This simplification allows the reduction of polarization effects to a scalar bond ‘polarization parameter’, and subsequent partitioning of the local electron density into charge modifiers located at atom centers. The induced charges assigned to each atom are determined self-consistently. This simplification permits a reasonable approximation of both the magnitude and direction of molecular dipole moments and of molecular polarizabilities in the case of small-molecule fluorocarbons. The model is extended to the calculation of atom-centered partial atomic charges for two conformations of poly(vinylidenefluoride). The proposed method fits well into the framework of established atomistic simulation techniques based on Coulombic nonbonded atomic interactions.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Plant cell, tissue and organ culture 1 (1981), S. 123-129 
    ISSN: 1573-5044
    Schlagwort(e): Glycine max (L.) Merr. ; in vitro ; plant regeneration ; growth regulators
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Glycine max (L.) Merr. (soybean) andGlycine soja Sieb. and Zucc. cell suspension cultures were grown and used as inoculum sources for growing callus on agar-solidified nutrient media. Concentrations and chemical forms of the growth regulators in liquid and solidified media were altered in an attempt to achieve in vitro plant regeneration. Numerous embryoids, particularly ofG. soja, were produced on basal nutrient media supplemented with 100 ppm casein hydrolysate, 0.1 μM abscisic acid, 2.25 μM 2,4-dichlorophenoxyacetic acid, and 15 μM adenine or 0.46 μM kinetin. Often the roots of the embryoids elongated. This was enhanced in the presence of an inhibitor of gibberellin synthesis (1 to 20 μM Amo 1618). Callus recovered from aG. soja suspension culture produced one shoot structure when grown on a solid medium containing 0.2 μM Amo 1618 and 80 μM glutathione. The shoot structure consisted of two distinct buds, one producing two leaves. The shoot did not develop into a plant. Although regeneration of soybean plants was not achieved, these observations suggest that it may be achievable.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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