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  • 78.70.Ck  (1)
  • Ascidian  (1)
  • dwarf bamboo (Sasa)  (1)
  • Electronic structure and strongly correlated systems
  • Superfluidity and superconductivity
  • [abr] EGTA; ethyleneglycol bis(β-aminoethyl
  • Springer  (3)
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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
    X-ray spectroscopy of thermally distorted electronic states in crystals (1999)
    Springer
    JETP letters 69 (1999), S. 938-942 
    Details
    ISSN: 1090-6487
    Keywords: 78.70.Ck ; 61.10.Eq
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new type of x-ray spectroscopy is proposed which can detect the thermal-motion-induced distortions of atomic electronic states in crystals. It is shown that those distortions can cause extra Bragg reflections (so-called forbidden reflections) and that their intensity should grow with increasing temperature. The reason is that the thermal displacements, which change the symmetry of atomic environment, can modify the tensor amplitude of x-ray resonant scattering. In the first approximation, the structure factor of extra reflections is proportional to the reflection vector H and to the mean-square thermal displacement $$\overline {u_j u_k } $$ for optical phonons. It is demonstrated that the forbidden resonant reflections, observed recently in Ge, could be caused by the thermal motion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.568116
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  • 3
    Electronic Resource
    Electronic Resource
    Role of the dwarf bamboo (Sasa) community in retaining basic cations in soil and preventing soil acidification in mountainous areas of Japan (1997)
    Springer
    Plant and soil 192 (1997), S. 167-179 
    Details
    ISSN: 1573-5036
    Keywords: acid deposition ; biological neutralization ; dwarf bamboo (Sasa) ; forest floor vegetation ; soil acidification
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Adjacent plots (1 m2) with and without communities of dwarf bamboo (Sasa), i.e. Sasa- and ref-plots, were selected in mountainous areas, which were relatively low in soil buffer capacity. The following parameters were studied: chemical properties of surface (0-30 cm) soil (at 6 sites), elemental abundances in the soil-Sasa ecosystem (at 6 sites), effect of artificial acid rain on the above two parameters (at 1 site), and chemical properties of throughfall and stemflow of Sasa (at 2 sites including one on a plain). Average values of pH(H2O), base saturation and the ratio of exchangeable (K+Mg+Ca)/exchangeable Al in surface soil were 4.35±0. 53, 25.2±14.3% and 0.41±0.28, respectively, in Sasa-plots and 4.26±0.63, 20.0±9.6%, and 0.28±0.13, respectively, in ref-plots. Though not significant, all soil parameters had higher values in Sasa-plots, i.e. Δx = ca. 0.1 unit, 5% and 0.13, respectively. When the abundance of elements (exchangeable cations in soil of 30 cm depth plus elements in litter and Sasa biomass) in the ecosystem was compared between the two plots, K (and often other basic cations) was higher in Sasa-plots than in ref-plots, whereas Al was lower. Artificial acid rain (1.5 L of 0.05 M H2SO4 applied monthly for 10 months) induced a reduction of Na, K, Mg and Ca in a ref-plot, but in a Sasa-plot only Na and K were reduced whereas Mg and Ca were completely retained. The composite samples of throughfall and stemflow of Sasa were ca. 0.5 higher in pH and richer in K, Mg and Ca than the ambient precipitation. The amounts (equivalents) of elements released by Sasa were in the order K 〉 Ca 〉 Mg. It was determined that about 87% and 98% of K, 76% and 87% of Ca, and 39% and 93% of Mg were of Sasa origin in the composite samples at a mountainous site (cambisol soil type) and a plain site (andosol soil type), respectively. Sasa communities may have a significant role in retention of basic cations in surface soil and prevention of soil acidification because of recycling elements in the soil-Sasa ecosystem.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004209929394
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