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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
    High-resolution transmission electron microscopy of AlAs-GaAs semiconductor superlattices (1996)
    Springer
    Journal of materials science 7 (1996), S. 285-295 
    Details
    ISSN: 1573-482X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A new high-resolution transmission electron microscopy (HREM) technique is proposed for observing interfacial structures in semiconductor superlattices in the 〈1 1 0〉 cross-section, and is used to characterize AlAs-GaAs interfacial step structures. Analysis of diffracted beam amplitudes shows that the {1 1 1| beam amplitudes of GaAs are minimized at an extinction distance of 14.4 nm, whereas those of AlAs show significantly higher values. This remarkable difference in the {1 1 1| beam amplitudes leads to a marked contrast between HREM images of GaAs and AlAs around this specimen thickness, allowing edge-on observation of the interfacial atomic steps running along the 〈1 1 0〉 direction. Artifacts produced by ion milling prevent atomic-scale observations of the interfaces so an artifact-free TEM specimen preparation technique is also presented. The HREM method provides information on the step intervals and straightness of step edges at AlAs-GaAs interfaces fabricated on just-cut and vicinal GaAs (0 0 1) substrates. The effect of the growth interruption method during molecular beam epitaxy on interface smoothing is also demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00188957
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  • 4
    Electronic Resource
    Electronic Resource
    Improved recovery of trace amounts of gold (III), palladium (II) and platinum (IV) from large amounts of associated base metals using anion-exchange resins (2000)
    Springer
    Fresenius' journal of analytical chemistry 366 (2000), S. 213-217 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The adsorption and desorption behaviors of gold (III), palladium (II) and platinum (IV) were surveyed in column chromatographic systems consisting of one of the conventional anion-exchange resins of large ion-exchange capacity and dilute thiourea solutions. The noble metals were strongly adsorbed on the anion-exchange resins from dilute hydrochloric acid, while most base metals did not show any marked adsorbability. These facts made it possible to separate the noble metals from a large quantity of base metals such as Ag (I), Al (III), Co (II), Cu (II), ¶Fe (III), Mn (II), Ni (II), Pb (II), and Zn (II). Although it used to be very difficult to desorb the noble metals from the resins used, the difficulty was easily overcome by use of dilute thiourea solutions as an eluant. In the present study, as little as 1.00 μg of the respective noble metals was quantitatively separated and recovered from as much as ca. 10 mg of a number of metals on a small column by elution with a small amount of dilute thiourea solution. The present systems should be applicable to the separation, concentration and recovery of traces of the noble metals from a number of base metals coexisting in a more extended range of amounts and ratios.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050042
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  • 5
    Electronic Resource
    Electronic Resource
    Visualization and analysis of adsorption behavior of alcohols on aqueous alcohol solution surfaces utilizing Brewster angle videomacrography and digital image processing (1996)
    Springer
    Experiments in fluids 21 (1996), S. 94-102 
    Details
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract An experimental study has been made to establish an optical method to investigate the adsorption behavior of alcohols on their aqueous solutions without adding any tracer or fluorescent material to the solutions. An expanded laser beam with controlled polarization is incident upon each solution surface of interest at the Brewster angle of air/water interface. This optical setting permits us to detect the p-polarized light reflected from an adsorbed film as two-dimensional real-time videograms with high sensitivities. The technique has been applied to visualizing adsorbed films of various alcohol homologues.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00193912
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  • 6
    Electronic Resource
    Electronic Resource
    Cation disordering in heat-treated anthophyllites through oxidation and dehydrogenation (1998)
    Springer
    Physics and chemistry of minerals 25 (1998), S. 160-167 
    Details
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract  Oxidation and dehydrogenation processes for heat-treated anthophyllites were investigated using Mössbauer and infrared spectroscopy. At temperatures from 350°C to about 650°C, Fe2+ at the M1 and M3 sites oxidizes, yielding Fe3+ + one electron. A proton from the (OH)– is liberated and combines with this electron to form a hydrogen atom; and some Fe2+ ions at the M2 and M4 sites exchange with Mg at the M1 and M3 sites and then are oxidized in a similar way; at higher temperature, OH remaining in the (MgMgMg/Fe3+)-(OH)-configuration are dehydrogenated by decomposition of the amphibole to orthopyroxene and quartz. During oxidation and dehydrogenation of anthophyllite, there is disordering of Mg and Fe at the M1, M2, M3 and M4 sites in all samples studied. When all Fe2+ is oxidized, the site occupancies of at the M4 and M1, M2, M3 sites become identical, indicating that Mg and Fe3+ are completely disordered at these sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002690050099
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  • 7
    Electronic Resource
    Electronic Resource
    Immunoelectron microscopic demonstration of estrogen receptors in osteogenic cells of Japanese quail (1991)
    Springer
    Histochemistry and cell biology 96 (1991), S. 41-44 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The localization of estrogen receptors (ERs) in osteogenic cells was immunoelectron microscopically examined in the femurs of female and estrogen-treated male Japanese quail. An electron dense reaction product showing ER localization was observed in the nuclei of osteoblasts and immature osteocytes in the medullary bone of the female quail. However, reaction product was not seen in the osteoclasts. On the endosteal bone surface of male quail, nuclear reaction product was detected in bone lining cells. After 24 h of estrogen treatment, reaction product was observed in the nuclei of preosteoblasts on the endosteal bone surface. After 48 h, the medullary bone partly appeared along the endosteal surface. Nuclear reaction product was seen in osteoblasts on the medullary bone surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00266759
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  • 8
    Electronic Resource
    Electronic Resource
    Muon facility plans towards JHP (1992)
    Springer
    The European physical journal 56 (1992), S. S296 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The future muon facility planned for the future Japanese accelerator project (Japanese Hadron Project) and related activities towards advanced muon facilities are described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02426814
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  • 9
    Electronic Resource
    Electronic Resource
    A stochastic approach to nonequilibrium thermodynamics of chemical reaction system (1979)
    Springer
    The European physical journal 33 (1979), S. 191-198 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Nonequilibrium thermodynamics is formulated by combining the nonlinear Fokker-Planck equation with the so-called Gibbs entropy postulate. The entropy production thus derived consists of two parts: one is of the same form as the usual entropy production and the other is the fluctuating part attendant on it. The evolution criterion can easily be verified in the stochastic framework. For illustration the system governed by the linear Fokker-Planck equation is in detail discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01323693
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  • 10
    Electronic Resource
    Electronic Resource
    Alternierende Copolymere mit -(ABA)-Sequenzen auf Grund der radikalischen Copolymerisation des Methacrylsäure-Co(III)-Komplexes mit Na-Styrol-4-sulfonat (1978)
    Springer
    Colloid & polymer science 256 (1978), S. 307-307 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01550731
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