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  • 1
    Electronic Resource
    Electronic Resource
    A cationic polymer, Eudragit-E, as a new liquid embolic material for arteriovenous malformations (1996)
    Springer
    Neuroradiology 38 (1996), S. S151 
    Details
    ISSN: 1432-1920
    Keywords: udragit-E ; Embolic material
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We have developed a new liquid material for embolisation of arteriovenous malformations: a mixture of methyl and butyl methacrylate, plus dimethylaminoethyl methacrylate copolymer (Eudragit-E) in a solvent consisting of ethanol and iopamidol. Upon contact with aqueous substances, Eudragit-E precipitates rapidly and forms a soft elastic sponge within 3 s, as the ethanol diffuses. In blood, the positively charged Eudragit-E aggregates the negatively charged blood elements. Transcatheter embolisation of 4 canine and 52 rat renal arteries was feasible. Histological studies revealed no acute inflammatory reaction within 1 week, but mild to moderate reactions in the subacute and chronic stages. No recanalisation was seen. Because of its unique properties and excellent thrombogenicity the Eudragit-E mixture seems a promising embolic material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02278144
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  • 2
    Electronic Resource
    Electronic Resource
    Crystallographic study of cobalt treatment on γ-Fe2O3 : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6731-6733 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Chemical analysis and x-ray diffraction measurements of samples during the reaction of cobalt treatment were carried out to study the mechanism of reaction. X-ray diffraction, TEM observation, and magnetic measurements of core γ-Fe2O3 and the modified particles were performed to investigate the crystal growth of cobalt ferrite on core γ-Fe2O3 particles. From chemical analysis of Fe2+ and total-iron ions in the reacting suspension and x-ray diffraction measurements of samples during the reaction, it is clear that the lattice constant becomes larger due to the formation of cobalt ferrite on core γ-Fe2O3 without decrement of Fe2+/total-iron ratio. So, cobalt ferrite on core γ-Fe2O3 particles is formed not by the oxidation of added Fe2+ ions, but by the electron transfer from Fe(OH)2 to core material. From x-ray diffraction measurements, I400/I311, I220/I311, and I111/I311 were calculated. While I400/I311 and I220/I311 are almost constant, only I111/I311 increases with increasing the amount of cobalt and ferrous ions added. These results show that cobalt ferrite is preferentially grown on (111) plane which is the close-packed plane of spinel lattice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352517
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  • 3
    Electronic Resource
    Electronic Resource
    Fabrication and characterization of reactive ion beam etched SiC gratings : Proceedings of the 4th international conference on synchrotron radiation instrumentation (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 1439-1442 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A holographic SiC grating has been fabricated by means of reactive ion beam etching in Ar+CHF3 mixture and by using photoresist as an etching mask. The etch rates of SiC and photoresist depend on the CHF3 concentration in Ar+CHF3 mixture. A maximum value for a ratio of the etch rate of SiC to that of photoresist was found to be 1.29 for 67%Ar+33%CHF3 mixture. Diffraction efficiency of an ion-beam etched grating of 1200 l/mm grooves coated with Au was measured by using synchrotron radiation and the Al kα emission line from an x-ray tube. The diffraction efficiency of the first order was 4.5%–9.3% in the soft x-ray region between 8.34 and 120 A(ring) with a small amount of the higher order and the scattered light components. In addition, it is demonstrated that SiC can be etched in SF6 gas by synchrotron radiation excitation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143037
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  • 4
    Electronic Resource
    Electronic Resource
    Characterization of multilayer reflectors and position sensitive detectors in the 45–300 A(ring) region : Proceedings of the 4th international conference on synchrotron radiation instrumentation (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 1513-1515 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Multilayer reflectors and position sensitive detectors have been developed in constructing imaging optical systems in the 45–300 A(ring) region. Molybdenum-silicon (2d=140 A(ring), N=20) and nickel–carbon (2d=100 A(ring), N=20) multilayers were deposited on a spherical mirror (25 cm in diameter) for the normal incidence and on a segment of paraboloidal mirror (20 cm×10 cm) for 30° grazing incidence. Their optical characteristics were evaluated by using characteristic x rays and monochromatized synchrotron radiation in the 45–300 A(ring) region. A position sensitive detector is made of a tandem microchannel plate (MCP) with a CsI photocathode and resistive plate, which is placed at the focal plane of each mirror. The detection efficiency and position resolution were measured by using characteristic x rays of CKα and monochromatized synchrotron radiation in the 45–200 A(ring) region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143008
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  • 5
    Electronic Resource
    Electronic Resource
    Involvement of Protein Kinase C in γ-Aminobutyric Acid Release from Xenopus Oocytes Injected with Rat Brain mRNA (1996)
    Oxford, UK : Blackwell Science Ltd
    Journal of neurochemistry 67 (1996), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: Involvement of protein kinase C (PKC) in the release of γ-aminobutyric acid (GABA) was examined in Xenopus laevis oocytes injected with mRNA from rat cerebellum, as compared with findings in slices of rat cerebellum. The mRNA-injected oocytes preloaded with [3H]GABA showed spontaneous release of [3H]GABA, ∼0.5% of GABA content per 1 min. Stimulation with either Ca2+ ionophore (A23187) or a high K+ concentration increased the release of [3H]GABA from slices of rat deep cerebellar nucleus and mRNA-injected oocytes but not from noninjected and water-injected oocytes. 12-O-Tetradecanoylphorbol 13-acetate (10–300 nM) but not 4α-phorbol 12,13-didecanoate (300 nM) potentiated the A23187-stimulated release of [3H]GABA from slices and from mRNA-injected oocytes, in a concentration-dependent manner. Thus, machinery associated with release processes of GABA can be expressed in oocytes by injecting rat cerebellar mRNA, and PKC participates in GABA release from the functionally expressed GABAergic nerve terminals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1471-4159.1996.67020868.x
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  • 6
    Electronic Resource
    Electronic Resource
    Superpolished single-crystal molybdenum mirror for x-ray ultraviolet to x-ray radiation (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 1111-1113 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High-quality single-crystal molybdenum (Mo) fabricated by a secondary recrystallization method has been polished with a new polishing technique. The superpolished surface of the Mo single crystal has a surface roughness of 3.5 A(ring) rms. This superpolished single-crystal Mo has been used for a high-power electron beam pumped argon excimer laser (λ=126 nm) as a cavity mirror. Peak output power of more than 3 MW has been achieved without any damage to the mirror surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99177
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  • 7
    Electronic Resource
    Electronic Resource
    ZnSe homoepitaxial layers grown at very low temperature by atmospheric pressure metalorganic vapor-phase epitaxy (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 2728-2733 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: ZnSe homoepitaxial layers with high crystalline quality were grown on (100) ZnSe substrates (grown by the iodine vapor transport method) between 190 and 250 °C. The surface morphologies of homoepitaxial layers (homoepilayers) grown below 250 °C were all mirrorlike. The concentration of self-activated (SA) centers is related to the growth temperature. The band-edge photoluminescence (PL) intensity increases drastically with increasing temperature from 190 up to 210 °C, decreases above 210 °C, and the SA-PL intensity increases monotonically as the growth temperature increases. The mechanism of suppressing the occurrence of SA centers below 250 °C is assumed that the concentration of Zn vacancies diffused from the highly iodine-doped ZnSe substrates into the ZnSe homoepilayers reduces at this temperature region. The SA-PL intensity of the ZnSe homoepilayer with the strongest band-edge emission (grown at 210 °C) is the same or weaker than that of the best ZnSe heteroepitaxial layer (heteroepilayer). Below 200 °C, the FWHM of the ZnSe (400) diffraction is 14 arcsec which is the best value we have ever obtained, though the growth temperature seems to be too low to maintain the crystalline quality. The comparison on the crystalline quality with the ZnSe heteroepilayers is discussed in detail from the viewpoints of the epitaxial growth mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342760
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  • 8
    Electronic Resource
    Electronic Resource
    X-ray optical properties of molybdenum-carbon, molybdenum-silicon, and nickel-carbon multilayers : International conference on synchrotron radiation instrumentation (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 2006-2009 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have fabricated multilayer reflectors of molybdenum-carbon, molybdenum-silicon, and nickel-carbon for x rays of 1–200 A(ring) with an electron beam evaporation method in ultrahigh vacuum. The multilayers were deposited on flat and figured substrates of float glass and superpolished glass with a surface roughness of 2–3 A(ring) (rms). The thickness of a layer pair and the number of layer pairs were 30–100 A(ring) and 10–20, respectively. The x-ray characteristics of these multilayer reflectors were evaluated in the 1.5–200 A(ring) region with characteristic x rays (Cu-Kα, Si-Kα, Al-Kα, and C-Kα) and monochromatized synchrotron radiation. Peak reflectivities of molybdenum-carbon were found to be 70% at Cu-Kα and 40% at Al-Kα in grazing incidence and those of molybdenum-silicon to be more than 30% in the 150–170 A(ring) band in near-normal incidence. On the basis of these experimental results, the x-ray optical properties of multilayers are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140861
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  • 9
    Electronic Resource
    Electronic Resource
    A plane-grating monochromator for radiometric calibration : INTERNATIONAL CONFERENCE ON SYNCHROTRON RADIATION INSTRUMENTATION (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 2089-2092 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new plane-grating monochromator and calibration chamber were constructed for the radiometric calibration of plasma diagnostic devices. The monochromator is designed to cover a wavelength range of 1.8–238 nm with moderate resolving power of 500±200 in λ/Δλ. To check the performance of the monochromator, spectral distribution and resolution were measured by experiments on photoemission from solids and photoionization of rare gases. The characterization of multilayer reflectors by the use of this beamline is demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140833
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  • 10
    Electronic Resource
    Electronic Resource
    The electronic structure and energy level alignment of porphyrin/metal interfaces studied by ultraviolet photoelectron spectroscopy (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 1899-1901 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Electronic structures of 5, 10, 15, 20-zinctetraphenylporphyrin (ZnTPP)/metal (Au, Ag, Al, Mg) interfaces prepared in ultrahigh vacuum were investigated by ultraviolet photoelectron spectroscopy (UPS). We found that the electronic energy levels of ZnTPP align to the vacuum level of substrate metal, with a constant energy shift of vacuum levels across the interface. These findings cannot be explained by the simple models assuming vacuum level alignment at the interface. We also found that sample exposure to oxygen induces energy level shift in close relation with change of substrate work function at oxygen exposure. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.114370
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