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  • 1
    Electronic Resource
    Electronic Resource
    Quantity of prelocalized maternal factor is associated with the timing of initiation of an epidermis-specific gene expression of the ascidian embryo (1998)
    Springer
    Development genes and evolution 208 (1998), S. 151-156 
    Details
    ISSN: 1432-041X
    Keywords: Key words Timing mechanisms ; Ascidian ; Half-egg-volume embryos ; Amount of a maternal factor ; Epidermis-specific gene expression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  We produced half-egg-volume ascidian embryos by dividing the unfertilized egg of Halocynthia roretzi at the equatorial plane, and investigated the timing of the initiation of the expression of three tissue-specific genes, a muscle-specific actin gene HrMA4, a notochord-specific gene As-T and an epidermis-specific gene HrEpiC in the half-egg-volume embryos of the animal side and those of the vegetal side. The timing of the onset of HrMA4 and As-T expression in both the animal- and vegetal-half embryos and that of HrEpiC expression in the animal-half embryos were essentially the same as that of normal embryos. In contrast, the timing of HrEpiC expression in the vegetal-half embryos was delayed by one division cycle compared with the normal embryos. This delay was partially recovered by increasing the amount of unfertilized egg cytoplasm of the animal hemisphere, suggesting that the timing of HrEpiC expression is regulated by the amount of a maternal factor which is distributed abundantly in the animal hemisphere of the unfertilized egg.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004270050166
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  • 2
    Electronic Resource
    Electronic Resource
    Cu-NQR study of magnetism and superconductivity in Ce1+xCu2+ySi2 under pressure (2000)
    Springer
    Hyperfine interactions 128 (2000), S. 193-204 
    Details
    ISSN: 1572-9540
    Keywords: CeCu2Si2 ; NQR ; pressure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In order to investigate magnetic properties in the vicinity of the magnetic to superconducting (SC) phase boundary, we have performed Cu-NQR measurements under hydrostatic pressure (P) on two off-stoichiometric Ce1+xCu2+ySi2 polycrystals: Ce0.99Cu2.02Si2 (denoted as Ce 0.99) exhibits the anomalous ground state so-called A phase dominated by critical magnetic correlations and Ce0.975Cu2Si2 (Ce 0.975) shows a static magnetic ordering at ambient P. With increasing P which enhances the Kondo temperature, the fraction of the A phase becomes markedly suppressed, and the SC fraction increases correspondingly, although Tc stays nearly constant in the measured pressure range, P≤14.4 kbar. This shows that the P-induced transition from the A to the SC phases is of a first-order type, without passing through a quantum (T→0) phase transition. However, no superconductivity has been attained in Ce 0.975 up to 19.4 kbar. It is considered that the P-induced superconductivity is sensitive to the sample quality.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012635716291
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