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  • 1
    Digitale Medien
    Digitale Medien
    Ion-beam annealing of electron traps in n-type Si by post-H+ implantation (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 1053-1057 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The effects of post-H+ implantation on electron traps that are induced by P+ implantation (300 keV, 1×109 cm−2) has been studied by deep-level transient spectroscopy. H+ implantation is performed at room temperature to a dose of 2×1010 cm−2 in the range 30–120 keV. The post-H+ implantation partly decreases the concentration of the electron traps induced by P+ implantation, although it increases the concentrations around the projected range of H+. The annealing effect is ascribed to the reaction of preexisting defects with point defects induced by postimplantation. Peaks are observed in the reduction ratio profiles of the preexisted trap concentrations versus the distance from the projected ranges of postimplantation. The highest values of the reduction ratios in each postimplantation tend to decrease with increasing distance between the projected ranges of P+ and H+. This is due to the decrease of the supply of point defects caused by postimplantation with increasing distance. We compare the reduction ratio profiles of the dominant three electron traps (Ec−0.12, 0.15, and 0.39 eV). © 1997 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.365870
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  • 2
    Digitale Medien
    Digitale Medien
    A vesicular variant of bullous pemphigoid with autoantibodies against unidentified 205- and 150-kDa proteins at the basement membrane zone (1997)
    Oxford, UK : Blackwell Publishing Ltd
    British journal of dermatology 137 (1997), S. 0 
    Details
    ISSN: 1365-2133
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Summary We describe a 75-year-old man who developed a vesicular variant of bullous pemphigoid with a distinctive result of immunoblot analysis. Characteristic symptoms consisted of vesiculopapular eruptions with erythematous patches on the arms and legs, many of which fused to form irregularly outlined areas of erythema varying in size. Direct immunofluorescence revealed a linear deposition of IgG at the basement membrane zone of the skin, and indirect immunofluorescence detected circulating IgG autoantibodies at a titre of 1: 160. which reacted with the antigens located on the epidermal side of skin split with 1 mol/L, NaCI. Immunoblot analysis using epidermal extracts demonstrated the presence of IgG antibodies directed to 150, 205, 240 and 280 kDa proteins as well as to the 180kDa bullous pemphigoid antigen (BPAG2). All antibodies eluted from nitrocellulose membrane imprints of individual bands with molecular weights of 150, 180 and 205 kDa were found by indirect immunofluorescence to react with the basement membrane zone, whereas those elutcd from the bands with molecular weights of 240 and 280 kDa did not. These findings suggest that antibodies directed not only to the 180kDa BPAG2, but also to 150 and 205 kDa proteins, are involved in the pathogenesis of bulla formation in this patient.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1365-2133.1997.19502046.x
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  • 3
    Digitale Medien
    Digitale Medien
    X-ray Holographic Microscopy of Biological Specimens with an Electronic Zooming Tube (1996)
    Chester : International Union of Crystallography (IUCr)
    Journal of synchrotron radiation 3 (1996), S. 35-40 
    Details
    ISSN: 1600-5775
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: X-ray holographic microscopy of biological specimens has been performed using in-line holography with the following improvements: (i) an electronic zooming tube is utilized as a detector, and (ii) the object planes are restricted by a metal frame which is not transparent to X-rays at the wavelengths used in the present experiments. The latter modification is useful in computer reconstruction and serves as a reference area where there are no photons in the reconstructed images. This system can minimize the inclusion of errors when recording and reading out holograms compared with methods using an X-ray resist as a detector, or optical reconstruction methods. Two-dimensional images of human cells have been successfully obtained with the present system. Comparison of these images with optical images revealed a good coincidence in structure outlines but not in internal structure images. Holographic observation of HeLa cells at different wavelengths showed a wavelength dependence of the reconstructed images. Since the electronic zooming tube is applicable to a wide range of X-ray wavelengths and has a promising potential to improve its resolution, these results strongly suggest that the present system is a good candidate for the development and establishment of an X-ray holographic microscopy system.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0909049595014294
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  • 4
    Digitale Medien
    Digitale Medien
    Identification of a spin-glass and a cluster-glass by Mössbauer measurements: Fe0.5Mn0.5TiO3 and Fe0.2Mg0.8TiO3 (1996)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 18 (1996), S. 263-268 
    Details
    ISSN: 0392-6737
    Schlagwort(e): Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source X-ray scattering, etc.) ; Critical-point effects, specific heats short-range order ; Antiferromagnetics ; Conference proceedings
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Summary Mössbauer measurements have been made on two kinds of spin-glass (SG) systems: one is the magnetically non-diluted mixed compound Fe0.5Mn0.5TiO3 with the SG-freezing temperatureT SG=21.5K, and the other is the diluted one Fe0.2Mg0.8TiO3 withT SG=6K. We have shown that the temperature variation of the Mössbauer spectrum of Fe0.2Mg0.8TiO3 above and around itsT SG is essentially different from that of Fe0.5Mn0.5TiO3: the former is typical of a cluster-glass and the latter of an ordinary spin-glass. The present work has clearly demonstrated that the Mössbauer spectroscopy is the most useful and unique technique to distinguish a cluster-glass from an ordinary spin-glass.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02458902
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  • 5
    Digitale Medien
    Digitale Medien
    Monte Carlo simulation of physicochemical processes of liquid water radiolysis (1997)
    Springer
    Radiation and environmental biophysics 36 (1997), S. 105-116 
    Details
    ISSN: 1432-2099
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Physik
    Notizen: Abstract The paper describes developments of the physicochemical part of a computer code system that estimates DNA strand break induction on plasmid pBR322 DNA. In order to test the reliability of the model, we evaluated the dielectric function and the time-dependent yield of chemical species in the presence of OH radical scavenger or dissolved oxygen. Results agree with measurements on the radiolysis of liquid water. When a hybrid model of a liquid inelastic cross-section and a vapour elastic cross-section is used, energy deposition by vibrational excitations is estimated to be approximately 11% of total energy deposition.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s004110050061
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  • 6
    Digitale Medien
    Digitale Medien
    Production of submicron-sized multihollow polymer particles having high transition temperatures by the stepwise alkali/acid method (1996)
    Springer
    Colloid & polymer science 274 (1996), S. 428-432 
    Details
    ISSN: 1435-1536
    Schlagwort(e): Multihollow particles ; emulsion polymerization ; morphology ; carboxyl group ; transition temperature
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: Abstract Submicron-sized multihollow styrene-methacrylic acid (92.6/7.4, molar ratio) copolymer particles having high transition temperature above 100°C were produced by using the stepwise alkali/acid method proposed by the authors. The original particles were prepared by emulsion copolymerization of styrene and methacrylic acid. The effects of pH, temperature and time in the alkali treatment process as the first step on the multihollow structure were clarified under the same acid treatment conditions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00652464
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  • 7
    Digitale Medien
    Digitale Medien
    Fluconazole monotherapy for cryptococcosis in non-AIDS patients (1996)
    Springer
    European journal of clinical microbiology & infectious diseases 15 (1996), S. 787-792 
    Details
    ISSN: 1435-4373
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Treatment with 200 to 400 mg/day fluconazole was evaluated in 44 patients without AIDS who had cryptococcosis (19 with cryptococcal meningitis, 22 with pulmonary cryptococcosis, 3 with other cryptococcal infections). For all patients, the clinical response rate was 89% (48% were clinically cured and 41 % clinically improved). Of the patients with cryptococcal meningitis, 89% were mycologically cured. These rates are comparable to those obtained in the treatment of AIDS patients with cryptococcal disease. In the group of patients with cryptococcal meningitis, there was a high rate of agreement between the mycological response to therapy and cryptococcal antigen test results. The use of cryptococcal antigen testing is recommended in all patients with cryptococcosis.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01701520
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  • 8
    Digitale Medien
    Digitale Medien
    Production of submicron-sized multihollow polymer particles by alkali/cooling method (1996)
    Springer
    Colloid & polymer science 274 (1996), S. 801-804 
    Details
    ISSN: 1435-1536
    Schlagwort(e): Multihollow particles ; emulsion polymerization ; morphology ; carboxyl group ; alkali swelling
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: Abstract Submicron-sized styrene-methacrylic acid copolymer particles, which were produced by emulsion copolymerization, were changed to those having multihollow structure by treating stepwise the emulsion as follows. First alkali treatment was carried out at higher temperature than the glass transition temperature and subsequently the emulsion was cooled by keeping it at room temperature. This was named “alkali/cooling method”. The effects of methacrylic acid content, pH, time and temperature in the alkali treatment on the formation of multihollow structure were clarified.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00654677
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  • 9
    Digitale Medien
    Digitale Medien
    Effect of molecular weight on the production of multi-hollow polymer particles by the alkalîcooling method (1997)
    Springer
    Colloid & polymer science 275 (1997), S. 82-85 
    Details
    ISSN: 1435-1536
    Schlagwort(e): Key words Multi-hollow particle ; emulsion polymerization ; morphology ; carboxyl group ; alkali swelling
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: Abstract  The effects of molecular weight, particle diameter and cooling condition on the formation of multi-hollow structure formed within submicron-sized styrene-methacrylic acid copolymer particles by the “alkali/cooling method” proposed by the authors were examined and the formation mechanism was proposed. The original particles were produced by emulsion copolymerization in the presence of n-octyl mercaptan as a chain transfer agent.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s003960050055
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  • 10
    Digitale Medien
    Digitale Medien
    Preparation of nanoparticles by “dissolution” of submicron-sized ionized styrene-methacrylic acid copolymer particles in nonionic emulsifier solution (1997)
    Springer
    Colloid & polymer science 275 (1997), S. 170-174 
    Details
    ISSN: 1435-1536
    Schlagwort(e): Key words Carboxyl group ; emulsion polymerization ; nanoparticles ; microsphere ; emulsifier
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: Abstract  Styrene-methacrylic acid copolymer (P(S-MAA)) nanoparticles having high Tg were produced by a dissolution of submicron-sized P(S-MAA) particles as follows. Submicron-sized P(S-MAA) particles having various MAA contents were produced by emulsion copolymerization. Secondly, they were treated in a polyoxyethylene nonylphenyl-ether nonionic emulsifier aqueous solution at pH 13.0 and above 90 °C. The nanoparticles having about 30 nm in diameter were only produced from the particles having MAA contents around 7 mol%, and above the contents, they were not produced. It seems to be based on that emulsifier molecules are not adsorbed onto the polymer molecules enough to dissolve them. The effect of MAA content on such a dissolution behavior was examined using seven kinds of different nonionic emulsifiers having hydrophile-lipophile-balance values between 12.2 and 18.2 at various temperatures and initial pH.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s003960050067
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