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  • 2005-2009  (7)
Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 637-640 
    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
    Notes: After the Tantalum metal was subjected to the anodic oxidation at suitable voltage in2M H2SO4 solution, tantalum oxide with rhombic or amorphous structure formed on the metalsurface. The Oxide showed apatite formation ability in simulative body fluid at 6d. It meant theanodic oxidation treatment ia an effective method to accelerate the bioactivity of tantalum metal
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 342-343 (July 2007), p. 565-568 
    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
    Notes: Nano-titania ceramics is a potential biomaterial for orthopaedic application. In ourprevious studies, a bioactive nano-titania ceramics was prepared by using alkali-heat treatment. Inthis paper, hydroxyapatite was used as a grain growth inhibitor additive to get nano-titania ceramicswith different grain size, and the effect of grain size on the bioactivity was studied in vitro
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 15-17 (Feb. 2006), p. 786-791 
    ISSN: 1662-8985
    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
    Notes: Effects of deformation at austenite region and cooling rate on the microstructure andmechanical properties of low carbon (0.06 wt. % C) high strength low alloy steels have beeninvestigated. Average grain size decreased and polygonal ferrite transformation promoted withincreasing deformation amount at austenite region due to increase of ferrite nucleation site.Microstructure was also influenced by cooling rate resulting in the development of a mixture of finepolygonal ferrite and acicular ferrite at 10°C/s cooling rate.Discontinuous yielding occurred in highly deformed specimen due to the formation of polygonalferrite. However, small grain size of highly deformed specimen caused lower ductile-to-brittletransition temperature than slightly deformed specimen
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1744-313X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Two chemokine (C-X3-C) receptor 1 (CX3CR1) gene polymorphisms, V249I and T280M, and 10 CC chemokine receptor 5 (CCR5) promoter haplotypes, P1–P10, have recently been reported to influence the progression of acquired immune-deficiency syndrome (AIDS). As these studies were performed mainly with Caucasian and African-American subjects, we determined the distribution of these alleles in Chinese people for the purpose of predicting possible clinical responses to the human immunodeficiency virus type 1 (HIV) epidemics in countries with significant Chinese populations, as well as to establish their effects on the expression of surface CCR5. Ninety-six HIV-negative Chinese individuals in Taiwan were subjected to genotyping, and we thus determined that the allelic frequencies of CX3CR1V249I and T280M changes were 2.6% and 2.1%, respectively, which were lower than found in Caucasians (25.5% and 14.0%, respectively). Unlike the previous reports, we only detected CCR5P1 and P4 haplotypes in Taiwanese people, and the P1/P1, P1/P4 and P4/P4 genotype frequencies were 21.0%, 41.1% and 37.9%, respectively. The sequencing data confirmed the results of previous studies, showing that CCR5P1 exhibited a complete linkage disequilibrium with a polymorphic allele 59029A present in the CCR5 promoter. Furthermore, fluorescence-activated cell sorter analysis revealed that, in the absence of the CCR2–64I mutation, individuals carrying CCR5P1 tended to express more surface CCR5 on monocytes and CD4+ cells. Therefore, this study not only reports the frequencies for the CX3CR1 and CCR5 promoter haplotypes in a Chinese population living in Taiwan, but also identifies a statistical link between the P1/P1 haplotype and the elevated CCR5 expression levels in the study group.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1365-2036
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Background:  Transcatheter arterial embolization is a major palliative treatment for unresectable hepatocellular carcinoma, but the survival benefit of transcatheter arterial embolization is controversial.Aim:  To evaluate the role of transcatheter arterial embolization in different stage of unresectable hepatocellular carcinoma and to select patients who can get the best benefit from the treatment.Methods:  From 1991 to 1995, 476 patients who had unresectable hepatocellular carcinoma from four medical centres in Taiwan were enrolled. Among them, 425 underwent transcatheter arterial embolization, and 51 received supportive treatment alone. The survivals between the two groups were compared.Results:  Among the 476 patients, transcatheter arterial embolization can significantly prolong survival. The 1-, 2-, and 5-year survival rates for patients who underwent transcatheter arterial embolization were 60.2%, 39.3%, and 11.5%; and the rates for patients who underwent supportive treatment were 37.3%, 17.6%, and 2%, respectively (P = 0.0002). The survival benefit of transcatheter arterial embolization was observed in patients between Cancer and the Liver Italian Program 0 and Cancer and the Liver Italian Program 4. In multivariate analysis, transcatheter arterial embolization, tumour size 〈5 cm and earlier Cancer and the Liver Italian Program stage were independent factors associated with a better survival.Conclusions:  For patients who fulfilled the criteria of transcatheter arterial embolization, embolization can serve as a primary treatment for patients with unresectable hepatocellular carcinoma. The survival benefit of transcatheter arterial embolization is regardless of tumour stages.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 280-283 (Feb. 2007), p. 1335-1338 
    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
    Notes: The isothermal oxidation behaviors of MgAlON/Si3N4 composite which was synthesized by pressureless nitridation reaction sintering have been investigated in flowing air at 1100ºC, 1200ºC and 1300ºC respectively. The results show that the composite represents excellent self-healing property of oxidation at 1300ºC, which might be attributed to the formation of protective silicate film with reasonable viscosity, good spreading power and very low oxygen diffusion coefficient, and to the formation of compact surface resulted from the expansion effect of forming mullite from SiO2 and Al2O3. However, the self-healing property of it is relatively poor at 1100ºC and 1200ºC as compared to 1300ºC
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 361-363 (Nov. 2007), p. 427-430 
    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
    Notes: Extracellular matrix (ECM) proteins play an essential role during biomineralization inbone and engineered tissues. In a previous study [1], we showed that calcite preferentially nucleated onpure elastin fibers. However, the actual cellular ECM fibers are composed of a combination of proteins,primarily collagen, fibronectin and some elastin. Here we follow the calcium carbonate- and calciumphosphate- mineralization process in vitro when these ECM proteins are combined and determine thedifferences between these proteins in the biomineralization process. The surface morphology and mechanicalproperties of the protein fibers during the early stages were probed by atomic force microscopy (AFM) andshear modulation force microscopy (SMFM). The nucleation of the mineral crystals on the protein matriceswas investigated by scanning electron microscopy (SEM). Preliminary data showed that the moduli of allprotein fibers increased at the early stages, with collagen having the largest increase in supersaturatedcalcium bicarbonate solution. In metastable calcium phosphate solutions the modulus of the mixedelastin-fibronectin fibres increased to a greater extent than the moduli of the fibers composed of the singleproteins. Longer exposure in the mineral solutions led to the formation of crystals templated along theself-assembled fiber structures
    Type of Medium: Electronic Resource
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