Sen'i Gakkaishi
Online ISSN : 1884-2259
Print ISSN : 0037-9875
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Volume 61, Issue 5
Displaying 1-11 of 11 articles from this issue
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Column
Commentation
Reports
Transactions
  • Cultivation of Noble Entero-bactor Species producing Bacterial Cellulose under the Presence of Inorganic Substances
    Mariko Ago, Kunihiko Okajima, Miwa Shimizu, Hisaya Mochizuki, Chihiro ...
    2005Volume 61Issue 5 Pages 119-123
    Published: 2005
    Released on J-STAGE: December 15, 2005
    DOIhttps://doi.org/10.2115/fiber.61.119
    JOURNAL FREE ACCESS
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    Several composites of bacterial cellulose and inorganic compound were obtained by cultivation of a noble bacterial cellulose producing Entero-bactor species under the presence of inorganic substances. It was found that the presence of non-soluble inorganic substances gave considerable influence on bacterial cellulose production itself. Observation of SEM and X-ray diffraction patterns of the obtained composites revealed that cellulose microfibril became narrower and thinner, and the degree of the planner orientation of the microfibril became larger in the some compounds with specific inorganic material species. Above such results might open a new way to prepare the new materials with noble and potential functions.
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Technical Papers
  • Analysis of the Pore Structure of Various Cellulosic Fibers by Liquid Chromatography
    Yuichi Yanai, Yoshio Shimizu, Hiroaki Sasaki, Nobuo Donkai
    2005Volume 61Issue 5 Pages 124-131
    Published: 2005
    Released on J-STAGE: December 15, 2005
    DOIhttps://doi.org/10.2115/fiber.61.124
    JOURNAL FREE ACCESS
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    In the analytical method for ascertaining the pore structure of cellulosic fibers by liquid chromatography through drawing a bundle of threads into a column[4], the preparation procedure and the type of specimens deeply influence the results. In the case of Tencel, rayon and linen, the permeability limit is clear but, in the case of cotton treated with liquid ammonia, the permeability limit is difficult to discover. To solve this problem, a method of making each thread free and removing twists before bringing the threads together as a bundle is useful. The permeability limit for Tencel, rayon, linen and cotton are found to have a PEG molecular diameter of 5.8nm and for liquid ammonia treated cotton 5.8nm, or 4.9nm, through the improved method.
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  • Color Fastness and Antibacterial Activity of the Fibers Treated with Culture Medium of Pseudomonas Aeruginosa
    Koki Onda, Hiroh Kubokawa, Takao Shinozawa
    2005Volume 61Issue 5 Pages 132-137
    Published: 2005
    Released on J-STAGE: December 15, 2005
    DOIhttps://doi.org/10.2115/fiber.61.132
    JOURNAL FREE ACCESS
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    In this study, we tested the color fastness of various fibers treated with culture medium of Pseudomonas aeruginosa at alkaline conditions. After that, we tested the antibacterial activity of these fibers to Staphylococcus aureus and Klebsiella pneumoniae. As a result, we found that the antibacterial activity was easily affected after color fastness test of water, washing and laundering and ultraviolet light. Moreover, after these color fastness tests, treated fibers, especially nylon and acetate, faded extensively. On the other hand, after color fastness test of dry cleaning, treated fibers did not fade and maintained their antibacterial effect. Therefore, we suggest that dry cleaning is a suitable method of washing and indoor use is desirable for practical use.
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