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  • 2005-2009
  • 2000-2004  (3)
  • Key words Electrorheological fluid  (2)
  • DNA polymorphism  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Synthesis and electrorheological characterization of emulsion-polymerized dodecylbenzenesulfonic acid doped polyaniline-based suspensions (2000)
    Springer
    Colloid & polymer science 278 (2000), S. 894-898 
    Details
    ISSN: 1435-1536
    Keywords: Key words Electrorheological fluid ; Polyaniline ; Emulsion polymerization ; Dodecylbenzenesulfonic acid ; Suspension
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The electrorheological (ER) properties of dodecylbenzenesulfonic acid (DBSA) doped polyaniline suspensions in silicone oil were investigated. In contrast to chemically polymerized polyaniline in an acidic aqueous medium by oxidation polymerization, we adopted an emulsion polymerization technique in which aniline is polymerized in an emulsion of water and a nonpolar (or weakly polar) organic solvent. The effects of electric field strength and particle concentration on the ER properties of DBSA-doped polyaniline suspensions in silicone oil were then examined. Rheological measurements were also carried out using a rotational rheometer with a high-voltage generator in both controlled shear rate and shear stress modes, and the results showed that the ER properties were enhanced by increasing the particle concentration and electric field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960000360
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Electrorheological characteristics of polyaniline and its copolymer suspensions with ionic and nonionic substituents (2000)
    Springer
    Colloid & polymer science 278 (2000), S. 61-64 
    Details
    ISSN: 1435-1536
    Keywords: Key words Electrorheological fluid ; N-substituted copolyaniline ; Polyaniline ; Poly(aniline-co-o-ethoxyaniline)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Electrorheological (ER) characteristics of ER fluids, composed of suspensions of semiconducting polyaniline and two different copolyaniline particles in silicone oil, were determined experimentally. Ionic sodium diphenylamine sulfonate and nonionic o-ethoxyaniline were used to synthesize copolyanilines, i.e. N-substituted copolyaniline and poly(aniline-co-o-ethoxyaniline), respectively. ER fluids composed of these three different polymers were compared with respect to their rheological properties under an applied electric field. It was found that ER fluids containing a copolymer with an ionic group exhibited the highest ER performance among polyaniline and its copolymer systems in a shear-rate region above 1 s−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050009
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Association of the vitamin D receptor start codon polymorphism (FokI) with bone mineral density in postmenopausal Korean women (2000)
    Springer
    Journal of human genetics 45 (2000), S. 280-283 
    Details
    ISSN: 1435-232X
    Keywords: Key words Bone mineral density ; FokI ; DNA polymorphism ; Vitamin D receptor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract We undertook this study in order to examine the association between bone mineral density (BMD) and a polymorphism at the first of two potential translation initiation codons in the vitamin D receptor (VDR) gene. This polymorphism was detected by restriction fragment length polymorphism analysis, using polymerase chain reaction (PCR) and the restriction endonuclease FokI. The f allele indicates the presence of the FokI site, and the F allele its absence. The FokI genotype was determined in 174 postmenopausal Korean women, aged 43–71 years. The distribution of FokI genotypes in Koreans was found not to differ significantly from those found in Caucasians and Japanese, although it does differ significantly from that found in the black American population. We observed a significant association between the FokI polymorphism and lumbar BMD; P = 0.048, analysis of covariance [ANCOVA], but no association with femoral neck BMD (P = 0.505, ANCOVA). Those with the ff genotype had a 13.3% lower BMD in the lumbar spine than the FF subjects. In addition, a significantly higher prevalence of the ff genotype was observed in osteoporotic compared with osteopenic or normal women (P = 0.036, χ2 test). These data suggest that the ff genotype of the VDR gene correlates with decreased BMD in the lumbar spine in postmenopausal Korean women.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100380070016
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    Paper (German National Licenses)
    Fulltext
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