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  • 61.70  (1)
  • 72.20  (1)
  • Inheritance  (1)
  • Key Words: Variscan basement, 3-D wide-angle data, DEKORP, deep seismic sounding, crustal structure, prestack-migration.  (1)
  • 1995-1999  (3)
  • 1975-1979
Collection
Keywords
Publisher
Years
  • 1995-1999  (3)
  • 1975-1979
Year
  • 1
    ISSN: 1432-2242
    Keywords: Key words Triticum aestivum ; Wheat ; Morphophysiological traits ; Inheritance ; Flag-leaf characters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Flag-leaf angle (FLAngle), flag-leaf area (FLarea) and flag-leaf area duration (FLADuration) are important traits in determining yield in wheat (Triticum aestivum L). Genetic studies on these traits are very few. The objective of this study was to determine the gene action controlling those traits in four wheat crosses. Six generations were available for each cross: parents (P1 and P2), F1, F2 and backcrosses (BC(F1×P1) and BC(F1×P2)). The joint scaling test described by Mather and Jinks was used to test goodness of fit to eight genetic models. Models including additivity, dominance and interallelic interactions best fitted the data for the three traits and the four crosses. Additive effects were most prevalent for FLAngle. They were also significant for FLArea and FLADuration. Dominance and epistatic gene action were also found, but the degree and direction was both trait- and genotype-specific. Heritabilities values were intermediate. Genetic progress, although slow, can be expected when selecting for these traits; however, selection would be most effective if delayed to later generations because of dominance and epistatic effects.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1420-9136
    Keywords: Key Words: Variscan basement, 3-D wide-angle data, DEKORP, deep seismic sounding, crustal structure, prestack-migration.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract —In addition to the near normal-incidence observations within the German DEKORP 2 project in 1984, wide-angle observations have been carried out on a parallel profile across the boundary between the Saxothuringian and Moldanubian crust, approximately 50 km NE of the main transect to control three-dimensional variations. Explosion sources have been used for the entire survey, providing excellent conditions for wide-angle registrations. A velocity model has been derived on the basis of in- and off-line refraction measurements using a kinematic raytracer which was extended to three dimensions by interpolation of 2-D velocity fields between parallel sections. Although prestack-migration of the data led to aliasing effects due to large shot and geophone spacing, stable results were obtained by forming envelopes after single-shot migration. The migrated sections reveal a strongly reflective Moho at about 31 km depth and a steeply (50°) dipping intracrustal reflector, which seems to be related to the border between the two Variscan units.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 61 (1995), S. 89-93 
    ISSN: 1432-0649
    Keywords: 61.70 ; 72.20 ; 78.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In LiNbO3:Fe,Me crystals (Me = K, Mg, Zn) elementary holograms are recorded and erased with frequency-doubled, ordinarily polarized pulses of a Q-switched Nd:YAG laser. At high light intensities (I 〉 109 Wm−2) holographic sensitivities and saturation values of refractive index changes grow with increasing intensity and a contribution to photo-conductivity appears increasing quadratically withI. The intensity-dependent parts of the holographic quantities are diminished by increasing the lithium content of the samples or by doping the crystals with magnesium or zinc. Experimental results can be described by a two-center charge transport model, which is the Fe2+/3+ model supplemented by shallow traps, namely niobium ions occupying lithium sites.
    Type of Medium: Electronic Resource
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