繊維学会誌
Online ISSN : 1884-2259
Print ISSN : 0037-9875
61 巻 , 4 号
選択された号の論文の11件中1~11を表示しています
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  • 松本 喜代一, 斉藤 浩行
    2005 年 61 巻 4 号 p. 89-87
    発行日: 2005年
    公開日: 2006/02/17
    ジャーナル フリー
    Separation of aqueous ethanol solutions by pervaporation using graft-coplymerized cellulose membranes was investigated on the basis of the results obtained previously. Polyanions, polycations and polybetains were introduced into cellulose membranes by grafting. These chemically modified cellulose membranes were expected to have selective separation functions of the water/ethanol mixtures due to high affinity to the solutions . Permeation rates (flux) and separation selectivity of the prepared membranes were evaluated by the pervaporation experiments. High permeation rates were obtained for the membranes with increasing pervaporation temperature. Relationships between permeation rate and separation selectivity obtained for the membranes were well explainable in terms of the molecular diffusion mechanism in this separation system. The high separation of various ceuulose-related membranes obtained in this study indicates the potentials of further development of the pervaporation technique.
  • 石黒(長幡) 操, 寺本  彰, 阿部 康次, 中岡 竜介, 土屋 利江
    2005 年 61 巻 4 号 p. 98-102
    発行日: 2005年
    公開日: 2006/02/17
    ジャーナル フリー
    The purpose of this study was to clarify the effect of hyaluronan (Hya) and sulfated hyaluronan (SHya) on rat calvarial osteoblast (rOB) cells proliferation and differentiation in vitro. rOB cells were cultured in the presence of Hya with different molecular weights (0.2, 2, 30, 90, 120 x 104) for 10days. Hya did not affect the proliferation of rOB cells. However, SHya suppressed the proliferation of rOB cells. The alkaline phosphatase (ALPase) activity of rOB cells cultured with SHya for 10 days was significantly enhanced in comparison with control (in the absence of polysaccharides) and with Hya. Hya suppressed the ALPase activity of rOB cells. As a result, SHya can control rOB cells proliferation and differentiation. SHya suppressed the rOB cells proliferation in a few culture days and promoted the differentiation. It was suggested that these effects were based on the sulfate groups of SHya. Therefore, it is considered that SHya is useful for the biomedical material, which promotes the differentiation of rOB cells.
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  • Yutaka Kawahara, Keiichi Tadokoro, Rie Endo, Masatoshi Shioya, Yukio S ...
    2005 年 61 巻 4 号 p. 115-117
    発行日: 2005年
    公開日: 2006/02/17
    ジャーナル フリー
    Alkali-retting was applied to kenaf bast ribbons and the mechanical properties and the structure of the retted fibers were investigated. In order to produce the fibers with preferable surface smoothness, the retting should be made at the NaOH concentration higher than 4 %. The tensile properties, however, showed a maximum at the NaOH concentration of 1 %, and decreased with increasing NaOH concentration. It seems difficult to prepare the fibers with preferable surface smoothness without loosing tensile strength only through the alkali-retting.
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