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  • 1
    Electronic Resource
    Electronic Resource
    Crystal structure of poly(p-phenylene) prepared by organometallic technique (1992)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 30 (1992), S. 293-297 
    Details
    ISSN: 0887-6266
    Keywords: poly(p-phenylene) from organometallic polymerization, crystal structure of ; crystal structure of poly(p-phenylene) from organometallic preparation ; X-ray diffraction of organometallically produced poly(p-phenylene) ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The two-dimensional crystal structure of poly(p-phenylene) is investigated by linkedatom Rietveld analysis of the x-ray diffraction powder profile. Two molecular chains are packed in a rectangular pgg unit cell (a = 0.779 nm; b = 0.551 nm) with a paracrystalline shift distortion along the chain axis. The molecular conformation is not rigidly planar; rotations between adjacent phenyl-ring planes in a molecule alternate with an angle of about 20°. The setting angle between the mean molecular plane and the a axis is 55.5°.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1992.090300309
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  • 2
    Electronic Resource
    Electronic Resource
    Substitution effect of Y3+ with Ca2+ in YBa2Cu3O7−δ (abstract) : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5391-5391 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The oxide superconductor YBa2Cu3O7−δ is known to have a rather free entrance of oxygen into the CuO chain between the BaO layers, and the oxygen deficiency δ is closely related with the critical temperature Tc. (1) When Y3+ site is substituted with Ca2+, the position of the oxygen vacancy is not on the Cu–O plane, but on the CuO chain as well as in the case of YBa2Cu3O7−δ. (2) When this substitution is done, electric neutrality is kept by the release of a half O2− for one Y3+ substitution with one Ca2+. (3) Therefore, the concentration of the positive hole is constant for this substitution, and Tc of the system is kept at the rather high temperature of about 86 K. (4) The relation between Tc and the hole concentration is in good agreement with the non-Ca2+ containing YBCO, and it can be said as a conclusion that the substitution of Y3+ with Ca2+ does not give any effect on the mechanism of the superconductivity of this system. (5) The crystallinity of the system is improved by the substitution to be better sintered and to have more narrow width of the critical temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348014
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  • 3
    Electronic Resource
    Electronic Resource
    Thermally stimulated exoelectron emission from silicon subjected to argon plasma treatment (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 7482-7486 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have investigated the thermally stimulated exoelectron emission (TSEE) from Ar plasma-treated Si by x-ray photoelectron spectroscopy and by employing a theoretical equation. The sample surfaces were exposed to ambient air after the plasma treatment. The TSEE glow curve (298–623 K) exhibited broad emission peaks at ∼373 and ∼473 K, and an increase in the intensity above 573 K. A theoretical analysis revealed that the glow curves were composed of four peaks except for the increase above 573 K, where each peak had a different trap depth, but almost the same electron affinity. The resolved two peaks in the lower temperature region increased compared to those in the higher temperature region with an increase in the O1s/Si2p ratio and also in the Si2p (oxide)/Si2p (substrate) ratio. The relationship of the surface chemical structure to the resolved four peaks is considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353993
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  • 4
    Electronic Resource
    Electronic Resource
    Structure and recording characteristics for CoPtB(O) rigid disk media : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5572-5574 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Structure, magnetic properties and recording characteristics of the CoPtB(O) media with various underlayers were investigated. Recording performance of the CoPtB(O) perpendicular media is closely related to the crystallinity. Magnetic properties and recording characteristics are much improved by the Au seed layer, and higher reproduced output can be obtained at 200 kFRPI. CoPtB(O) perpendicular media show higher resolution than the CoPtB(O)/Cr longitudinal one. The reproduced output of perpendicular media at 200 kFRPI is more than 10 dB higher than that of the longitudinal one. Noise characteristics of both media are quite different in the recording density response. With increasing recording density, the media noise of longitudinal media slightly increases, while that of the perpendicular one gradually decreases. This means for the perpendicular media that the media noise might originate not from the magnetic transition but from the irregular magnetic reversals within recorded bits.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353654
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  • 5
    Electronic Resource
    Electronic Resource
    Gated neutron streak camera with a uranium cathode (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 3592-3595 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A gated neutron streak camera with a uranium oxide cathode has been developed for laser fusion experiments. The energy spectrum of secondary electrons was improved by coating the uranium oxide cathode with thin cesium iodine. The tube design was carried out by computer calculation of electron trajectories. The newly developed streak tube showed a temporal resolution of about 70 ps. This streak camera can be applicable to a neutron yield greater than 1012 with a reasonable signal-to-noise ratio by gating a microchannel plate electron multiplier.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141576
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  • 6
    Electronic Resource
    Electronic Resource
    Imaging Bragg spectrometer for pinched plasma experiments (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 3761-3765 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A compact Bragg spectrometer for monochromatic imaging in the soft x-ray region was designed and examined. With this spectrometer, a pinhole image is simultaneously recorded with a monochromatic image. This makes it possible to easily identify the wavelength when the location of the soft x-ray source fluctuates from shot to shot, such as in the plasma focus and Z-pinch plasma. An rubidium acid phtalate (RAP) flat crystal was examined and monochromatic images of the argon K lines around 4 A(ring) were successfully obtained and displayed. The resolution power and dispersion obtained in situ were compared with the calculated values. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144503
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  • 7
    Electronic Resource
    Electronic Resource
    Effects of Cerebral Ischemia on Regional Dopamine Release and D1 and D2 Receptors (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 60 (1993), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: To expand on the nature of regional cerebral vulnerability to ischemia, the release of dopamine (DA) and dopaminergic (D1 and D2) receptors were investigated in Mongolian gerbils subjected to bilateral carotid artery occlusion (15 min) alone or with reflow (1–2 h). Extracellular cortical and striatal content of DA and its metabolites was measured by microdialysis using HPLC with electrochemical detection. The kinetic properties of D1 and/or D2 receptor binding sites were determined in cortical and striatal membranes with the use of radiolabeled ligands (125I-SCH23982 and [3H]YM-09151-2, respectively). The ischemic release of DA from the striatum was greater (400-fold over preischemic level) than that from the cortex (12-fold over preischemic content). The affinity for the D1-receptor ligand was lower (KD= 1.248 ± 0.047 nM) after ischemia than that for sham controls (KD= 0.928 ± 0.032 nM, p 〈 0.001). The number of binding sites for D2 receptors decreased in striatum (Bmax= 428 ± 18.4 fmol/mg of protein) after ischemia compared with sham controls (Bmax= 510 ± 25.2 fmol/mg of protein, p 〈 0.05). D1 or D2 binding sites were not changed either in the ischemic cortex or postischemic striatum and cortex. The findings strongly suggest that the ischemic release of DA from striatum is associated with early transient changes in D1- and D2-mediated DA neurotransmission.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-4159.1993.tb03311.x
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  • 8
    Electronic Resource
    Electronic Resource
    Increased plasma interleukin-6 in cutaneous plasmacytoma: the effect of intralesional steroid therapy (1997)
    Oxford, UK : Blackwell Publishing Ltd
    British journal of dermatology 137 (1997), S. 0 
    Details
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Cutaneous plasmacytosis is a rare disorder without systemic plasma cell proliferation in organs other than the skin, with a possible malignant transformation. However, there are few effective therapies available. It has been reported that interleukin-6 (IL-6), which is a cytokine inducing B-cell differentiation to immunoglobulin-producing cells, plays a part in systemic plasmacytosis. In this study, we performed intralesional steroid therapy in the lesions of cutaneous plasmacytosis in three patients, which resulted in sufficient clinical effects. We demonstrated that before treatment, plasma IL-6 levels were significantly elevated in all the patients, and that levels were reduced in parallel with the clinical improvement after therapy. Immunohistochemistry revealed IL-6 protein expression on tumour cells in the lesional skin. Reverse transcription—polymerase chain reaction (RT-PCR) detected IL-6 mRNA in the lesional skin in all cases, levels of which were decreased after the effective intralesional steroid therapy, but which were unchanged after ineffective topical photochemotherapy (PUVA). Peripheral blood mononuclear cells from the patients produced significantly large quantities of IL-6 which were reduced by addition of steroid in vitro. These results suggest that the generation of IL-6 plays the key role in cutaneous plasmacytosis and that intralesional steroid therapy is effective in reducing the production of IL-6 in this disorder.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2133.1997.tb03801.x
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  • 9
    Electronic Resource
    Electronic Resource
    Expression of cathepsin D and B in invasion and metastasis of squamous cell carcinoma (1997)
    Oxford, UK : Blackwell Publishing Ltd
    British journal of dermatology 137 (1997), S. 0 
    Details
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: To determine the involvement of proteinases with hydrolytic activity towards extracellular matrix and basement membrane, in invasion and metastasis of tumour cells, the expression of cathepsin D, an aspartic proteinase, and cathepsin B, a cysteine proteinase, was studied. Formalin-fixed paraffinembedded specimens from 13 patients who had squamous cell carcinomas (SCC) with local recurrence, skin and/or lymph node metastasis were examined. Cathepsin D stained intensely as a granular pattern (mature enzyme) in tumour cells of 69% of primary lesions and all the secondary lesions of the patients with SCC. Cathepsin B stained more intensely in SCC cells of all of the primary and secondary lesions than in normal epidermis: staining patterns were almost diffuse (procathepsin B). Granular and diffuse patterns (mature enzyme of cathepsin D and procathepsin B, respectively) appeared in the outer and inner parts of tumour islands, respectively. The presence of the active mature form of cathepsin D and procathepsin B in metastatic skin lesions of SCC was confirmed by Western blotting analysis. The presence and localization of the active mature form of cathepsin D suggests that activated cathepsin D may be involved in the invasion and metastasis of SCC.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2133.1997.18501943.x
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  • 10
    Electronic Resource
    Electronic Resource
    Orientation-dependent Ga surface diffusion in molecular beam epitaxy of GaAs on GaAs patterned substrates (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 7273-7281 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Generation of extra facets on ridge-type triangles with (001)-, (110)-, and (201)-related equivalent slopes on GaAs (111) A substrates and stripes running in the [1¯10], [110], and [100] directions on (001) substrates during molecular beam epitaxy of GaAs/AlGaAs multilayers was investigated. By investigating local variation in layer thickness in the regions adjacent to extra (114)A, (110), and (1¯1¯1¯)B facets common to the (111)A and (001) patterned substrates and extra facets specific to the respective substrates and growth rates of the facets relative to the growth rate on the substrate plane, the orientation-dependent Ga surface diffusion length, λGa, was elucidated as λGa(001)(approximate)λGa(1¯1¯3¯)B〈{λGa(1¯1¯1 ¯)B,λGa(3¯3¯1¯)B,λGa(013),λGa(113)A}〈λGa(159)(approximate)λGa(114)A(approximate)λGa(111)A〈λGa(110). That is, λGa increases in the order of the (001), (1¯1¯1¯)B-related, (111)A-related, and (110) surfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365548
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