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Yamaguchi, Daisuke; Mayama, Hiroyuki*; Koizumi, Satoshi; Tsujii, Kaoru*; Hashimoto, Takeji
European Physical Journal B, 63(2), p.153 - 163, 2008/05
The fractal dimensions of specific porous silica materials were investigated by a wide-q observation using ultra-small-angle neutron scattering technique. In order to control the fractal dimension of porous silica material, flaky particles made of alkylletene dimer (AKD) were employed as moulds and silica matrix was formed by sol-gel process. After the solidification of the silica matrix, the original AKD moulds were completely burnt away at high temperature (ca. 930K) and became pores having a particular fractal dimension. The fractal dimension of the pores was changeable by the compression of the AKD mould at different ratio during the sample preparation. We found that the fractal structure obtained in this study was distinctly different from those of ordinary silica aerogels.
Koizumi, Satoshi; Zhao, Y.; Tomita, Yoko*; Kondo, Tetsuo*; Iwase, Hiroki; Yamaguchi, Daisuke; Hashimoto, Takeji
European Physical Journal E, 26(1-2), p.137 - 142, 2008/05
Times Cited Count：55 Percentile：85.95(Chemistry, Physical)no abstracts in English
Masui, Tomomi; Shikinaka, Kazuhiro*; Kwon, H.*; Koizumi, Satoshi; Hashimoto, Takeji; Iwase, Hiroki; Kakugo, Akira*; Gong, J.*
no journal, ,
Actin is one of the cytoskeleton proteins and it is most abundant proteins in eucaryotic cell. They play a crucial role in cell motility by polymerization of monomeric globular G-actin into polymeric filamentous actin (F-actin). With actin binding proteins, they form various structures such as linear bundles, two-dimensional networks, and three-dimensional gels. It has been considered that these structures are controlled by the specific interaction between actin and binding protein. However from the physicochemical point of view, actin has negative charge and actin-binding protein has positive charge. Thus, the electrostatic interaction might play important role to determinein the structure. Based on this idea, we have investigated the effects of salt concentration on the stability and structure of actin-polymer complexes by using small angle neutron scattering (SANS) technique.
