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  • 1
    Electronic Resource
    Electronic Resource
    Hole carrier in MgB2 characterized by Hall measurements (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 982-984 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The longitudinal resistivity (ρxx) and Hall coefficient (RH) were measured for MgB2 sintered under high pressure. We found that RH is positive like cuprate high-Tc superconductors, and decreases as the temperature increases for 40 K 〈T〈300 K. The cotangent of the Hall angle was found to follow a+bT2 behavior from Tc to 300 K. At T=100 K, RH=4.1×10−11 m3/C from which the hole carrier density was determined to be 1.5×1023/cm3. This carrier density is 1–2 orders of magnitude larger than those of Nb3Sn and optimally doped YBa2Cu3Oy superconductors. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1392979
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  • 2
    Electronic Resource
    Electronic Resource
    Brain succinic semialdehyde dehydrogenase: identification of reactive lysyl residues labeled with pyridoxal-5′-phosphate (2001)
    Oxford, UK : Blackwell Science Ltd
    Journal of neurochemistry 76 (2001), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: An NAD+-dependent succinic semialdehyde dehydrogenase from bovine brain was inactivated by pyridoxal-5′- phosphate. Spectral evidence is presented to indicate that the inactivation proceeds through formation of a Schiff's base with amino groups of the enzyme. After NaBH4 reduction of the pyridoxal-5′-phosphate inactivated enzyme, it was observed that 3.8 mol phosphopyridoxyl residues were incorporated/enzyme tetramer. The coenzyme, NAD+, protected the enzyme against inactivation by pyridoxal-5′-phosphate. The absorption spectrum of the reduced and dialyzed pyridoxal-5′-phosphate-inactivated enzyme showed a characteristic peak at 325 nm, which was absent in the spectrum of the native enzyme. The fluorescence spectrum of the pyridoxyl enzyme differs completely from that of the native enzyme. After tryptic digestion of the enzyme modified with pyridoxal-5′-phosphate followed by [3H]NaBH4 reduction, a radioactive peptide absorbing at 210 nm was isolated by reverse-phase HPLC. The sequences of the peptide containing the phosphopyridoxyllysine were clearly identical to sequences of other mammalian succinic semialdehyde dehydrogenase brain species including human. It is suggested that the catalytic function of succinic semialdehyde dehydrogenase is modulated by binding of pyridoxal-5′-phosphate to specific Lys347 residue at or near the coenzyme-binding site of the protein.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1471-4159.2001.00147.x
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  • 3
    Electronic Resource
    Electronic Resource
    Abnormal Grain Growth at the Interface of Centrifugally Cast Alumina Bilayer during Sintering (2000)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 83 (2000), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Extensive abnormal grain growth occurs locally at the interface of centrifugally cast bilayers of MgO-doped (1000 ppm) Al2O3 (99.8% purity) during sintering. Results of systematic experiments indicate that the abnormal grain growth is attributable to particle aggregates segregated at the interface during centrifugal casting. Apparently, the particle aggregates contain a higher concentration of impurities than do the fine primary particles, causing local abnormal grain growth at the interface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2000.tb01463.x
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  • 4
    Electronic Resource
    Electronic Resource
    EFFECTS OF OIL DROPLET AND AGAR CONCENTRATION ON GEL STRENGTH AND MICROSTRUCTURE OF O/W EMULSION GEL (1999)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of texture studies 30 (1999), S. 0 
    Details
    ISSN: 1745-4603
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: The effects of oil droplet size and agar concentration on gel strength and microstructure of emulsion gels were investigated by compression test and cryoscanning electron microscope (Cryo-SEM). At all agar concentrations, the compressive stress values of emulsion gels were lower than those of the oil-free gels. Compressive stress and energy were significantly affected by oil droplet size and agar concentration, but compressive strain was not. SEM observation revealed that the overall volume of void spaces decreased and strand compactness increased with increasing agar concentration. Gels containing oil droplets had some void spaces between the gel network and the oil droplets. The strands of emulsion gels did not cover the oil globules completely, a phenomenon which was also observed for the gel with high agar concentration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-4603.1999.tb00220.x
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  • 5
    Electronic Resource
    Electronic Resource
    Influence of stabilizers on Na-β′′-Al2O3 phase formation in Li2O(MgO)-Na2O-Al2O3 ternary systems (1998)
    Springer
    Journal of materials science 33 (1998), S. 5671-5675 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The influences of stabilizers on β- and β′′-Al2O3 phase formations in Li2O(MgO)-Na2O-Al2O3 systems were investigated. When stabilized with 4MgCO3ċMg(OH)2ċ5H2O, most of the β′′-Al2O3 phase formed below 1200°C and further β- to β′′-Al2O3 transformation with an increase of temperature was not observed. On the other hand, when stabilized with Li2CO3,β′′-Al2O3 formation occurred by two steps. First, β′′-Al2O3 was partly formed below 1200°C, and, second, noticeable transformation from β-Al2O3 to β′′-Al2O3 occurred at higher temperature ranges. It was shown that transient eutectic liquid in the Li2O-Na2O-Al2O3 system promoted the β- to β′′-Al2O3 transformation at higher temperatures. Uniform distribution of both Mg2+ and Li+ stabilizing ions enhanced β′′-Al2O3 formation at low temperatures. In the Li-stabilized systems, however, homogeneous distribution of Li+ ions hindered both the formation of transient eutectic liquid and the second β- to β′′-Al2O3 phase transformation at high temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004488804249
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  • 6
    Electronic Resource
    Electronic Resource
    Fabrication of β- and β′′-Al2O3 tubes by pressureless powder packing forming and salt infiltration (1998)
    Springer
    Journal of materials science 33 (1998), S. 5695-5702 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A new forming method, pressureless powder packing (PLPP), was studied to fabricate the β- and β′′-Al2O3 tubes. Alkali sources were infiltrated into the pores of α-Al2O3 tube preforms that had been prepared by the PLPP forming method. The composition for the synthesis of β′′-Al2O3 phase was Na2O · 0. 138Li2 · 4.4Al2O3. The β′′-Al2O3 fraction of calcined and sintered bodies was increased with the increase of calcination temperature, and phase formation was largely affected by the type of starting α-Al2O3. Large particle size and narrow size distribution of fused α-Al2O3 resulted in uniform green microstructure that enhanced the homogeneity of alkali salts after infiltration, which was very important for the β′-Al2O3 formation. Sintered microstructure was uniform in all specimens but further development was required for density improvement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004449222905
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