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  • Electronic Resource  (9)
  • 1990-1994  (9)
  • 1993  (4)
  • 1991  (5)
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  • Electronic Resource  (9)
Years
  • 1990-1994  (9)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Magnetic properties of fine crystalline Fe–P–C–Cu–X alloys : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6241-6243 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The crystallization process and magnetic properties of Fe–P–C–Cu–Ge–Si amorphous alloys were investigated. After annealing above the crystallization temperature, the bcc Fe particles, with nanoscale grain size, precipitated in the amorphous alloy for a wide P concentration range. The volume ratio of the bcc Fe phase to amorphous was about 30%. The mixed phase of these alloys shows a drastic decrease of coercive force (Hc) and particle diameter (d) as P concentration increases. The lowest Hc was obtained for Fe78P16C2Cu0.5Ge3Si0.5, and Hc and d were 1.8 A/m and 16 nm, respectively. Observation by in situ Lorentz scanning electron microscopy (SEM) revealed that the width of magnetic domains were 0.01 or 0.1 mm and the domain walls with smaller bcc Fe particles moved in a weaker magnetic field than those with larger ones. So the low Hc is attributed to the decrease of magnetocrystalline anisotropy caused by fine structures. The core loss of fine crystalline Fe–P–C–Cu–Si–Mo alloy, W14/50, was 0.22 W/kg after annealing under a magnetic field of 2.4 kA/m.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350008
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  • 2
    Electronic Resource
    Electronic Resource
    Extremely-low-threshold and high-temperature operation in a photopumped ZnSe/ZnSSe blue laser (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 1401-1403 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A ZnSe/ZnSSe blue semiconductor laser was demonstrated to show very low threshold by direct photopumping of the ZnSe active layer. The lowest threshold at the excitation wavelength of 445 nm was 10 kW/cm2 at 300 K which is equivalent to the current density of 3.6 kA/cm2. This is the lowest threshold ever reported in II-VI photopumped lasers and is approaching the theoretically calculated threshold. The characteristic temperature of the threshold, which characterizes the temperature dependence of the threshold in the exponential form, was 124 K up to the measured 400 K and was comparable to III-V double-heterostructure lasers. The differential quantum efficiency remained the similar level up to 400 K and its decrease observed at 400 K was within 23% of the efficiency at 300 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.105319
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  • 3
    Electronic Resource
    Electronic Resource
    Reordering in the β-Phase of Cu-Zn-Al Shape Memory Alloys (1991)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 56-58 (Jan. 1991), p. 481-485 
    Details
    ISSN: 1662-9752
    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
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.56-58.481.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Histochemical demonstration of copper in LEC rat liver (1993)
    Springer
    Histochemistry and cell biology 100 (1993), S. 249-256 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Livers of LEC rats were histochemically stained for copper according to the modified Timm's method, which includes trichloroacetic acid (TCA) treatment. TCA pretreatment was effective in removing zinc and iron, leaving copper as the major metal in the liver. Hepatocytes in 3-month-old rats were stained intensely by the modified Timm's method, both in frozen sections and in paraffin-embedded specimens. The centrilobular hepatocytes were usually stained, but positive cells were also randomly distributed in the hepatic lobes, showing a mosaic pattern. The staining was intensified in 8- compared to 3-month-old LEC rats. In contrast hepatocytes from LEA rats, the normal counterpart of LEC rats, were faintly stained for copper. Proliferating cholangioles found in older LEC rats were shown to lack copper deposition, and hepatocellular carcinoma showed less copper deposits than the hepatocytes surrounding the tumor. The copper staining was augmented in livers of LEC rats subjected to copper-loading, but was less intense in the livers treated with d-penicillamine. The staining intensity under the various experimental conditions showed good correlation with the copper concentration. Lysosomal deposition of copper in hepatocytes was demonstrated by electron microscopic analysis for copper. Thus the modified Timm's method was shown to produce valuable results in demonstrating copper in LEC rat livers, providing important information for an understanding of the mechanism of copper deposition and hepatic disease of the animal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00270043
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  • 5
    Electronic Resource
    Electronic Resource
    A new mouse model for autoimmune orchitis (1991)
    Springer
    Medical microbiology and immunology 180 (1991), S. 1-14 
    Details
    ISSN: 1432-1831
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Experimental autoimmune orchitis (EAO) was induced in SMA mice (H-2nondefined) by repeated injection at intervals of 30 days of syngeneic testis homogenate (TH) together with Klebsiella O3 lipopolysaccharide (KO3 LPS) as a potent adjuvant. EAO was not induced by repeated injection of TH alone or KO3 LPS alone. At 10 days after the secondary injection of TH + KO3 LPS, there was marked infiltration with neutrophils in the seminiferous tubules and in the interstitium of the testis accompanied by destruction of the architecture of the seminiferous tubules and hypospermatogenesis. At 20 days after the secondary injection, infiltration with neutrophils in these areas had been replaced mostly by mononuclear cells (lymphocytes, plasma cells, and macrophages). Histopathological changes of the testes became severer by further injections until the 10th injection. The EAO lesions in the terminal stage were characterized by complete destruction of the tubular architecture of the testis, fibrosis, and aspermatogenesis. Lesions in the terminal stage were not restored at all. Spermagglutinating antibody titers in the serum increased and delayed-type hypersensitivity against TH estimated by footpad swelling developed in mice injected repeatedly with TH + KO3 LPS. Using immunofluorescence, antibodies against acrosomal components and tail components of the spermatozoa were detected in serum of these mice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00191695
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  • 6
    Electronic Resource
    Electronic Resource
    Structural requirement for catalytic activity of cobalt Schiff base complex in oxygenation of alkenes (1993)
    Springer
    Reaction kinetics and catalysis letters 49 (1993), S. 1-6 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Kinetics of the oxygenation of styrene catalyzed by cobalt Schiff base complex [(Co(L)] shows that the reaction rate depends on the shape but not on the redox potential of Co(L). Magnetism of Co(L) is important for product distribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02084021
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  • 7
    Electronic Resource
    Electronic Resource
    Heat capacity and pressure at phase separation and solidification of3He in hcp4He (1991)
    Springer
    Journal of low temperature physics 84 (1991), S. 133-156 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have measured heat capacity and pressure of 0.45% and 0.9%3He-4He mixtures at pressures between 25 bar and 33 bar and temperatures between 20 mK and 250 mK. The data show the latent heats and the pressure changes associated with the phase separation (or remixing) and with the liquification (or solidification) of the resulting droplets in the hcp matrix. Above about 31 bar, the phase separation and the liquid-solid phase transition are separately observable. From these data, as well as from the heat capacity of the liquid droplets, we conclude that the droplets are filled with almost pure3He showing bulk behavior and that only a part of the separated3He is liquified. The amount of the liquid depends on the history of the sample. The phase separation is reproducible and lasted for many hours. In the pressure range of the hcp-L1-L2 univariant the sample moves along the univariant for a limited temperature range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00681620
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  • 8
    Electronic Resource
    Electronic Resource
    Neuronal pp60c-src(+) in the developing chick spinal cord as revealed with anti-hexapeptide antibody (1993)
    Springer
    Journal of neurocytology 22 (1993), S. 244-258 
    Details
    ISSN: 1573-7381
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Polyclonal antibody was raised in rabbits against a synthetic hexapeptide R-K-V-D-V-R corresponding to a unique amino acid sequence of the neuron-specific c-src gene product pp60c−src(+). The antibody was purified by affinity chromatography. A single band with an apparent molecular mass of 60 kDa was recognized when the supernatant of homogenates of brain and spinal cord from chick embryos and chicks was probed with the affinity purified anti-hexapeptide antibody after SDS-polyacrylamide gel electrophoresis followed by Western blotting. Specificity of the antibody was further characterized by autophosphorylation assay of immunoprecipitate in comparison with the monoclonal antibody 327. Immunocytochemical studies by light microscopy revealed that pp60c−src(+) was localized in flake-like aggregates in neuronal cell bodies of the spinal cord in 7-15-day-incubated chick embryos and newly hatched chicks. Developing spinal ganglia and muscle cells were also immunoreactive at early developmental stages. By electron microscopy, the reaction product was observed mainly in two regions. One region was at polysomes and along the membranes of the rough endoplasmic reticulum. The other region was along the neuronal plasma membrane — at subsurface cisterns and at synapses. At synapses, the postsynaptic density, presynaptic membrane and synaptic vesicle membranes were immunostained. Immunoreactivity at synapses was more frequently observed at earlier stages than at later stages of development. These findings suggest that pp60c−src(+) is actively produced in developing neurons and has some important roles in synaptogenesis. In mature synapses, pp60c−src(+) may be involved in the interaction of synaptic vesicles with the presynaptic membrane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01187123
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  • 9
    Electronic Resource
    Electronic Resource
    Calcium supplementation in osteoporosis (1993)
    Springer
    Osteoporosis international 3 (1993), S. 159-162 
    Details
    ISSN: 1433-2965
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Although calcium is the most abundant inorganic constituent of the bone, indispensable for the maintenance of its physical strength, the role of calcium nutrition in the development of osteoporosis and the preventive and therapeutic significance of calcium supplementation in osteoporosis have been matters of intense controversy. The wide difference in the baseline nutritional intake of calcium among different groups and the variation in age of the patients studied may have been contributory factors. Emphasis has so far been placed on the rapid bone loss in the immediate postmenopausal period predominantly influenced by estrogen deficiency which has overshadowed the effect of calcium. The strong dependence of the effect of calcium preparation used tends to be forgotten. In the present study employing oyster shell electrolysate as the calcium source in patients with a mean age of approximately 80 years, bone mineral density was kept significantly higher than in age-matched, non-supplemented patients over a period of 2 years. In separate experimental studies, rats maintained on 2% calcium showed higher bone mineral content and lived longer than did controls maintained on 1% calcium. Age-associated deterioration of renal function and hyperlipidemia were also prevented by calcium supplementation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01621895
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