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  • 1
    Electronic Resource
    Electronic Resource
    Developmental Changes in Levels of Translatable mRNAs for Enolase Isozymes in Chicken Brain (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 47 (1986), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract Using chicken brain mRNAs, α and γ enolase precursors were synthesized in the rabbit reticulocyte cell-free translation system. The product proteins showed molecular weights almost identical to those of the mature subunits. The levels of translatable mRNAs for α and γ subunits were determined by the cell-free translation system and immuno-precipitation with specific antisera, during development of chicken brain. The level of α mRNA was high at any developmental stage of the brain. On the other hand, the γ mRNA level was very low at the early embryonic stage, and increased rapidly during development of the brain. These changes were closely correlated with those of the corresponding enzyme activities, indicating that the levels of enolase activities in developing brain were controlled primarily by the level of the translatable α and γ mRNAs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-4159.1986.tb00789.x
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  • 2
    Electronic Resource
    Electronic Resource
    Syntheses of Y(Ba1−xSrx)2Cu3O7−δ superconducting films by alternate sputtering (abstract) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5914-5914 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Recently, high-Tc oxide superconductors have been extensively studied because these materials can be applied to various electronic devices, especially highly sensitive magnetic sensors or high-speed switching elements. For such the applications, thin films with superior superconductivity and very smooth surfaces are needed. The purpose of this work is to develop an as-grown technique of Y-Ba-Sr-Cu-O films on comparatively low-temperature substrates by adopting a newly devised alternative sputtering. The sputtering apparatus was constructed by three targets and a substrate holder which was intermittently rotated and stopped facing the desired target. The targets were Y2O, BaO+SrO, and Cu or CuO. The thickness of the oxide layer alternately deposited was adjusted to the thickness of the each metal-oxide monolayer. The substrate used was a (100) plane of a single-crystal MgO. The substrate temperature Ts was changed from 450 to 600 °C. The deposition rate of the each layer was affected by Ts. Especially, the deposition of the CuO layer was very sensitive to conditions of the film growing surface: Ts and/or degree of oxidation. The film composition was adjusted by changing the deposition time of the each layer. The crystal with an oxygen-defective perovskite nucleated even at a Ts of about 500 °C. In the case of sintered bulks, a tetragonal phase was obtained when the content of Sr was comparatively large. In contrast, an orthorhombic phase was stabilized in the sputtered films. As-grown films showed a poor superconductivity. After a post-annealing in 1-atom O2 at a low temperature of about 450 °C, a sharp superconducting transition was observed above 77 K. As we increase the content of Sr, the resistivity of the film became large and semiconductive.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342202
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  • 3
    Electronic Resource
    Electronic Resource
    Anisotropic transport and nonparabolic miniband in a novel in-plane superlattice consisting of a grid-inserted selectively doped heterojunction (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 1214-1216 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Transport properties of electrons in a novel in-plane superlattice structure are studied and the field-effect transistor action has been demonstrated. The structure consists of an n-AlGaAs/GaAs modulation-doped heterojunction in which an array of monolayer-thick AlAs grid is embedded with an average period of 162 A(ring) in the channel region of the heterojunction. This grid has been prepared with molecular beam epitaxy by depositing a half monolayer of AlAs on a GaAs (001) vicinal plane, where periodically spaced atomic terraces are formed. The electron mobilities μ(parallel),μ⊥ parallel and normal to the grid are measured as functions of electron concentration NS. While the mobility ratio (μ(parallel)/μ⊥) is nearly unity at low NS, the ratio is found to get as large as 2.2 as NS increases. This anisotropic behavior of μ is well accounted for by the calculated nonparabolicity in the miniband structure of in-plane superlattices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101658
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  • 4
    Electronic Resource
    Electronic Resource
    Picosecond pulse generation (〈1.8 ps) in a quantum well laser by a gain switching method (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 1295-1297 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A picosecond pulse (〈1.8 ps) at 8570 A(ring) is successfully generated by a gain switching method in an optically pumped GaAs/AlGaAs multiquantum well laser with a cavity length of 155 μm. This is the narrowest pulse width so far achieved in semiconductor lasers without the external cavity. We believe that this short pulse generation results from the enhanced differential gain due to the two-dimensional properties of the carriers in the quantum wells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.98707
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  • 5
    Electronic Resource
    Electronic Resource
    Observation of a short optical pulse (〈1.3 ps) from a gain-switched quantum well laser (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 1580-1582 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Short light pulse generation from an optically pumped GaAs/AlGaAs quantum well laser is measured. The shortest pulse width achieved so far is less than 1.3 ps. In addition, it is found that the pulse from varies randomly even when the same excitation condition, which results from stochastic behavior of the spontaneous emission coupling to the lasing mode. In order to discuss these results in more detail, spatial dependent rate equations are analyzed in which the stochastic process of the spontaneous emission and the traveling effect of spontaneously generated optical wave packets are included.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99955
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  • 6
    Electronic Resource
    Electronic Resource
    Interface roughness scattering in GaAs/AlAs quantum wells (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 1934-1936 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We study experimentally and theoretically the influence of interface roughness on the mobility of two-dimensional electrons in modulation-doped AlAs/GaAs quantum wells. It is shown that interface roughness scattering is the dominant scattering mechanism in thin quantum wells with a well thickness Lw〈60 A(ring), where electron mobilities are proportional to L6w, reaching 2×103 cm2/V s at Lw∼55 A(ring). From detailed comparison between theory and experiment, it is determined that the "GaAs-on-AlAs'' interface grown by molecular beam epitaxy has a roughness with the height of 3–5 A(ring) and a lateral size of 50–70 A(ring).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.98305
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  • 7
    Electronic Resource
    Electronic Resource
    NMR study of ion-molecule interaction. 4. Proton and chlorine-35 and 35Cl NMR of chloride ion-trihalomethane association (1988)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 92 (1988), S. 2390-2394 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100319a057
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  • 8
    Electronic Resource
    Electronic Resource
    Changes in blood ketone body ratio with reference to graft viability after liver transplantation in rats (1989)
    Springer
    Transplant international 2 (1989), S. 133-136 
    Details
    ISSN: 1432-2277
    Keywords: Ketone body ratio ; in liver transplantation ; Rejection in liver transplantation ; Liver transplantation and ketone body ratio ; Liver transplantation, experimental ; Viability, liver graft
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Arterial blood ketone body ratio (acetoacetate/3-hydroxybutyrate; KBR), which reflects hepatic mitochondrial redox potential, was measured during a 2-week period after orthotopic liver transplantation in three groups of rats: group 1, the isogenic combination of LEW (RT11) graft to LEW recipient as control; group 2, the allogenic combination of ACI (RT1a) graft to LEW recipient without immunosuppressive treatment; and group 3, the allogenic combination of ACI to LEW with immunosuppressive treatment using cyclosporin (CyA). Isogenic recipients survived indefinitely. Allogenic recipients in group 2 had severe rejection with a mean survival of 10.3±0.54 days, while 77.8% of the allogenic recipients in group 3 survived more than 30 days. KBR of rats surviving more than 2 weeks in groups 1 and 3 gradually increased post-transplantation and was maintained at a high level. By contrast, though KBR in group 2 was restored at 3 days, it gradually fell and remained at a significantly low level (P〈0.001). It is suggested that KBR provides an accurate indicator for evaluating metabolic viability of the critically deteriorating liver graft accompanied by severe rejection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02414599
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  • 9
    Electronic Resource
    Electronic Resource
    In vitro growth of neoplastic rat glial cells (1975)
    Springer
    Journal of cancer research and clinical oncology 84 (1975), S. 193-202 
    Details
    ISSN: 1432-1335
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Ein mit Methylnitrosoharnstoff erzeugter Hirntumor (Ependymom) bei einer BD-Ratte wurde in vitro kultiviert. Es wuchsen sowohl Firoblasten als auch sternförmige gliaähnliche Zellen. Reimplantation dieser Zellen in das Gehirn einer anderen BD-Ratte führte zu Tumorwachstum in den weichen Häuten. Diese Geschwulst wurde intracerebral über mehrere Passagen verimpft. Obwohl dieser Transplantationstumor morphologisch einem Sarkom ähnlich war, konnten durch Silberimprägnation Gliazellen angefärbt werden. Eine aus der ersten Transplantationsgeneration in vitro abgeleitete Zellinie enthielt S-100 Protein in Spuren. In-vitro explantierte Zellen des mit Methylnitrosoharnstoff erzeugten Primärtumors wurden kloniert. Zwei Klone, RGL 1 und RGL 2, bestanden aus Zellen, die morphologisch den sternförmigen Elementen des Primärexplantates glichen. Der Klon RGL 1 enthielt S-100 Protein. In der 16. Passage wurde er erneut kloniert; von vier Unterklonen enthielt lediglich einer S-100 in Spuren. Dieser Klon besaß einen subdiploiden Karyotyp mit 39 Chromosomen, zusätzlich ein submetazentrisches Markerchromosom. Zwei Subklone von RGL 2 aus der 25. Passage besaßen 41 Chromosomen.
    Notes: summary An ependymoma was induced in the brain of a BD-IX rat by repeated doses of MNU. In vitro grown cells of the tumor were fibroblasts and stellate cells considered to be glial. Reimplantation of these cells into the brain of another BD-IX rat resulted a tumor growing in the meninges. This tumor was then repeatedly transplanted over several passages. Its gross morphology resembled that of a sarcoma; however, glial in cells could be demonstrated with silver methods. A cell line derived from the first transplanted tumor group proved to contain S-100 protein in traces in the first passages in vitro. Explanted cells of the primary ependymoma were cloned. Two clones were established, RGL 1 and RGL 2. The cells of both clones resembled morphologically the stellate elements of the primary explant. RGL 1 contained S-100 protein. It was cloned again in the 16th subpassage. Four clones were established. Only 1 contained S-100 protein in traces. The clone RGL 1 had a subdiploid karyotype with a modal number of 39 and a large submetacentric marker. It was subcloned in the 25th passage with two clones, both having a karyotype of 41 chromosomes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00304044
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  • 10
    Electronic Resource
    Electronic Resource
    Convergent-beam and small-area-parallel-beam electron diffraction patterns of icosahedral quasicrystals of an Al74Mn20Si6 alloy (1987)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 43 (1987), S. 494-501 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S010876818709743X
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