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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 7558-7560 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Effects of interface structure and oxidation state were studied in stacked magnetic tunnel junction (MTJ) structures with top and bottom antiferromagnetic layers to obtain optimum resistance and high tunneling magnetoresistance (TMR) ratios for read heads. The roughness of the NiFe surface and the Al coverage were significantly improved by introduction of O2 surfactant gas on the Ta-seed-layer surface, which increased TMR ratios of the MTJ with low resistance area (RA) products of less than 10 Ω μm2. Furthermore, it was found that avoidance of Ni oxidation and Co oxidation at the tunnel barrier interface is essential to obtaining high TMR ratios, and that a good Al coverage and Fe–oxide formation may enhance TMR ratios when Fe-rich magnetic materials are used. For the top-type and bottom-type structures, a TMR ratio of 12%–17% with RA products of 6–7 Ω μm2 was obtained, which provides sufficient performance for read heads. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 716-718 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The semiconductor industry is growing rapidly and requires high technologies for nano-structure devices. Ion sources for manufacturing the next-generation semiconductor devices have been studied from the viewpoint of applications to material processing, such as ion beam assisted deposition, ion beam etching, and ion implantation. Recently, large-area ion sources which extract broad ion beams with multiapertures have come to be required not only for processing the size-growing wafers but also for industrial applications to nonsemiconductor materials. However, the uniformity of plasma density over the multiaperture electrodes has not met the requirements yet. We suggest a new method to improve the uniformity by superposing microwaves to an inductively coupled plasma source. Distributions of ion species in the plasma are measured with a quadrupole mass spectrometer which can be moved in vacuum perpendicularly to the beam extraction. The distributions of both plasma density and ion species in the source plasma as well as their properties over a large area are being studied and discussed. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 713-715 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Microwave ion sources have many advantages over dc-discharge ion sources, such as long lifetime and high current for most ion species. But B+ ion current has been the only disadvantage. Here we experimentally study how to get higher B+ ion current by optimizing the shape and volume of the source chamber as well as by increasing the secondary electron emissivity of the chamber wall. We carry out the experiment with regard to the maximum ion beam, lifetime, and dynamic range of the beam current for various ion species. Then, we compare the data with those of the Bernas-type ion source that has been widely used in semiconductor manufacturing factories. As a result of the improvement, the performance of all the above-mentioned aspects of the microwave ion source exceed those of the Bernas-type ion source. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1365-2516
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: In multiply coinfected human immunodeficiency virus (HIV)-positive patients, we investigated the effects of high-activity antiretroviral therapy (HAART) using HIV protease inhibitors on three other viruses: hepatitis C virus (HCV), hepatitis G virus (HGV), and TT virus (TTV). Viral concentrations were measured serially by polymerase chain reaction methods in five patients with quadruple infection (HIV, HCV, HGV, and TTV) and in two patients with triple infection (HIV, HCV, and HGV) before and during HAART. In addition, CD4+ cell counts and serum alanine aminotransferase (ALT) levels were measured serially. Generally we observed no difference in serum HCV RNA, HGV RNA, or TTV DNA concentrations between samples obtained before and after initiation of HAART, whereas HIV RNA concentration decreased and CD4 counts increased in most patients. However, two patients had markedly decreased concentrations of HCV RNA and HGV RNA, respectively, more than 12 months after beginning HAART. Normalization of serum ALT levels was observed in a patient with decline of HCV RNA concentrations. No interactions were observed among these four viruses. HAART had no apparent direct effects on HCV, HGV, or TTV. Further studies will be required to elucidate whether the restoration of immune status through suppression of HIV replication by HAART may affect HCV or HGV RNA concentrations.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1365-2516
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: We performed a pilot study to evaluate the factors associated with response to interferon (IFN) therapy for chronic hepatitis C (CHC) with human immunodeficiency virus (HIV) coinfected haemophiliacs. Seven haemophiliacs, coinfected with HIV and hepatitis C virus (HCV), received 9 mega-units (MU) of natural IFN-alpha daily during the first 2 weeks and then three times a week for 22 weeks, all injected subcutaneously. Six patients were receiving zidovudine (AZT) 600 mg day−1 and didanosine (ddI) 200 mg day−1 during IFN therapy. This treatment was safe and well tolerated. Four patients had no detectable serum HCV-RNA at the end of therapy, but long-term, none of the seven patients achieved a sustained response, i.e. undetectable serum HCV-RNA with persistently normal serum alanine aminotransferase (ALT) 6 months after therapy. IFN did not affect CD4-positive cell counts. Most of our patients had high HCV-RNA loads and/or low CD4 counts, both unfavourable markers for IFN therapy. In conclusion, IFN therapy did not eradicate HCV from haemophiliacs coinfected with HIV.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1365-2222
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Background Airway remodelling in asthma such as subepithelial fibrosis is thought to be the repair process that follows the continuing injury as of chronic airway inflammation. However, how acute allergic inflammation causes tissue injury in the epithelial basement membrane in asthmatic airways remains unclear. Matrix metalloproteinases (MMPs) capable of degrading almost all of the extracellular matrix components have been demonstrated to be involved in cell migration through the basement membrane in vivo and in vitro.Objective We investigated the alterations of matrix construction and the role of MMPs in matrix degradation in the subepithelium during acute allergic airway inflammation.Methods Airway inflammation, the ultrastructure of the subepithelium and injury of types III and IV collagen in tracheal tissues from ovalbumin (OVA)-sensitized mice after OVA inhalation with or without the administration of tissue inhibitor of metalloproteinase-2 (TIMP-2) and dexamethasone were evaluated by cell counting in bronchoalveolar lavage (BAL) fluids, electron microscopy and immunohistochemistry, respectively.Results The disruption of the lamina densa and matrix construction and the decrease of the immunoreactivity for type IV collagen in subepithelium were observed in association with the accumulation of inflammatory cells in airways 3 days after OVA inhalation. This disorganization of the matrix components in the subepithelium, as well the cellular accumulation, was abolished by the administration of TIMP-2 and dexamethasone. The immunoreactivity for type IV collagen in the subepithelium in OVA-inhaled mice returned to the level of that in saline-inhaled mice 10 days after inhalation in association with a decrease of the cell numbers in the BAL fluid. The immunoreactivity for type III collagen was changed neither 3 nor 10 days after OVA inhalation.Conclusion These results suggest that epithelial basement membrane gets injured by, at least in part, MMPs as a consequence of cell transmigration through the membrane during acute allergic airway inflammation.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-1920
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Présentation d'un cas inhabituel d'anévrisme de l'artère carotide interne extradurale avec trajet anormal de l'artère cérébrale antérieure et diverses anomalies des artères cérébrales. L'angiographie revéla en outre la position haute et la coarctation de la crosse de l'aorte et l'hypoplasie de l'artère sous-clavière gauche, mais le système vertébro-basilaire était normal.
    Abstract: Zusammenfassung Fallbericht über einen Patienten mit einem Aneurysma der Arteria carotis interna und zusätzlichen multiplen Anomalien der Hirnarterien.
    Notes: Summary An unusual case of the extradural internal carotid artery aneurysm associated with the abnormal course of the anterior cerebral artery and other multiple anomalies of the cerebral arteries was presented. In addition, a high position and a coarctation of the aortic arch and a hypoplasia of the left subclavian artery were demonstrated by angiography, but the vertebro-basilar system was essentially normal.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 57 (1970), S. 387-388 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 183-187 (Apr. 2000), p. 1243-1248 
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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