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  • 1
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 342-343 (July 2007), p. 281-284 
    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: In this study, muscle-derived stem cell (MDSC)/Pluronics/polycaprolactone (PCL)microparticle hybrid mixture was prepared as a potential injectable urethral bulking agent for thetreatment of urinary incontinence. The MDSCs were isolated from the gastrocnemius muscles ofSD rats by a modified preplate method and characterized through FACS analysis using variousprimary antibodies (CD34, Sca-1, CD45 and desmin). The hybrid mixture was prepared by themixing of PCL microparticles (diameter, 100~200 μm) and MDSCs-containing thermo-sensitivePluronic (F127/F68 mixture) solution (4.5/5.5, w/v). The hybrid mixture was easily injectedthrough 18G needle into the body and stably remained in the applied site without initial volumedecrease, owing to a well-packed structure of PCL particles exhibited in the hybrid mixture. It wasobserved that the MDSCs were stably grown in the hybrid mixture without severe inflammation andimmune reaction. From the results, we recognized that the hybrid mixture can be a good candidateas an injectable bulking agent for the treatment of urinary incontinence, due to their goodinjectability, volume retention and biocompatibility
    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. 293-296 
    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: Electrospinning is a fabrication process that can produce highly porous nano-scale fiber-basedmatrices using an electrostatically driven jet of polymer solution. This method represents an attractiveapproach for polymeric biomaterial processing which provides the membrane structure that may retainmechanical strengths, flexibility, and high surface area. In this study, we prepared a guided boneregeneration (GBR) membrane with selective permeability, hydrophilicity, good mechanical strength andadhesiveness with bone using polycaprolactone (PCL) and Tween 80 by the electrospinning method. Theprepared PCL and PCL/Tween 80 electrospun sheets were characterized via morphology observation,mechanical property, water absorbability, and model nutrient permeability. It was observed that thePCL/Tween 80 (3 wt%) electrospun sheet have an effective permeation of nutrients as well as the goodmechanical strength to maintain a secluded space for the bone regeneration. From the results, thehydrophilized PCL/Tween 80 (3 wt%) electrospun sheet seem to be a good candidate as a GBRmembrane
    Type of Medium: Electronic Resource
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  • 3
    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
    Notes: TiO2 nanoparticles were prepared using the hydrolysis of titanium tetraisopropoxide(TTIP) using TENOH as a peptizing agent in the hydrothermal method. The physical properties ofprepared nanosized TiO2 particles were investigated. The photocatalytic degradation of orange II hasbeen studied using a batch reactor in the presence of UV light. The crystallite size of the anatasephase is increased from 15 to 30 nm as the molar ratio of TENOH/TTIP increases from 0.1 to 1.0.The titania particle prepared at TENOH/TTIP molar ratio=0.1 shows the highest activity on thephotocatalytic decomposition of orange II and the photocatalytic activity decreases according to anincrease in TENOH/TTIP molar ratio. In addition, the titania particles prepared at 160oC shows thehighest activity on the photocatalytic decomposition of orange II
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 36 (1998), S. 1637-1645 
    ISSN: 0887-6266
    Keywords: ester interchange reaction ; Monte Carlo method ; copolymerization ; degree of randomness ; miscible polyester blend ; Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The effects of reaction variables on the degree of randomness in copolymers formed by ester interchange reaction in miscible polyester melt blends were systematically investigated using a Monte Carlo method. Three reaction variables such as the molecular weight difference between two component polymers, the blend ratio, and the reaction ratio of end attack to bond flip, were particularly considered on the cubic lattice model. Ester interchange reactions were assumed to take place during reptational chain motions. It was found that the copolymerization was dependent upon the molecular weight difference and reaction ratio: As the molecular weight difference becomes smaller and when both end attack and bond flip reactions are involved simultaneously, the copolymerization is accelerated. However, the blend ratio does not affect the copolymerization process. This result is discussed in relation to the polymer chain conformation for the ester interchange reaction. © 1998 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 36: 1637-1645, 1998
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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