MEMBRANE
Online ISSN : 1884-6440
Print ISSN : 0385-1036
ISSN-L : 0385-1036
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Volume 1, Issue 3
Displaying 1-9 of 9 articles from this issue
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  • [title in Japanese]
    Ken Hotta
    1976 Volume 1 Issue 3 Pages 166-175
    Published: September 10, 1976
    Released on J-STAGE: October 21, 2010
    DOIhttps://doi.org/10.5360/membrane.1.166
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Yoshiya Shinagawa
    1976 Volume 1 Issue 3 Pages 176-183
    Published: September 10, 1976
    Released on J-STAGE: October 21, 2010
    DOIhttps://doi.org/10.5360/membrane.1.176
    JOURNAL FREE ACCESS
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  • Erratum to : Plasma Membrane and Cell Shape, with Special Reference to the Shape Transformation of Erythrocyte
    1976 Volume 1 Issue 3 Pages 183
    Published: 1976
    Released on J-STAGE: October 21, 2010
    DOIhttps://doi.org/10.5360/membrane.1.3_183
    JOURNAL FREE ACCESS
    Download PDF (144K)
  • [title in Japanese]
    K. Yoshida
    1976 Volume 1 Issue 3 Pages 184-186
    Published: September 10, 1976
    Released on J-STAGE: October 21, 2010
    DOIhttps://doi.org/10.5360/membrane.1.184
    JOURNAL FREE ACCESS
    Download PDF (512K)
  • [title in Japanese]
    [in Japanese]
    1976 Volume 1 Issue 3 Pages 187-196
    Published: September 10, 1976
    Released on J-STAGE: October 21, 2010
    DOIhttps://doi.org/10.5360/membrane.1.187
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Takeshi Matsuura
    1976 Volume 1 Issue 3 Pages 197-211
    Published: September 10, 1976
    Released on J-STAGE: October 21, 2010
    DOIhttps://doi.org/10.5360/membrane.1.197
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1976 Volume 1 Issue 3 Pages 213-224
    Published: September 10, 1976
    Released on J-STAGE: October 21, 2010
    DOIhttps://doi.org/10.5360/membrane.1.213
    JOURNAL FREE ACCESS
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  • Monolayers of Polyalanine
    Takuya Yamashita, Shinsuke Yamashita
    1976 Volume 1 Issue 3 Pages 225-230
    Published: September 10, 1976
    Released on J-STAGE: October 21, 2010
    DOIhttps://doi.org/10.5360/membrane.1.225
    JOURNAL FREE ACCESS
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    The conformation of D, L-copolyalanine in monolayer state (spreading solvent, TFA; subsolution, distilled water) was investigated combining with the conformation in solid state as well as solution properties. The monolayer properties of poly-L-valine and poly-DL-valine were also compared with those of poly-L-alanine and poly-DL-alanine.
    1) Poly-L-valine is relatively unstable in the α-helical conformation in solid state compared with poly-L-alanine. The corresponding differences were observed in the monolayer properties of these polymers.
    2) Poly-DL-valine seems to be spread in the β-conformation as in the case of poly-DL-alanine.
    3) For D, L-copolyalanine, remarkable changes in [α] 20D and bo values in DCA solu-tion and in α-helix content in solid state were observed in the range of 60-80% regarding the L-content of feed monomer. A similar observation was made for the limiting areas of monolayers. From these results, it was concluded that the polymers are spread in the α-helical or α-helix-like conformation at the air/water interface when the α-helix content is high and the helix is stable (limiting area: ca. 13. 5 Å2/residue), while the polymers are in the/β-conformation when the stability of the a-helix portion becomes weak with the increasing incorporation of antipode-residues in the main chain (limiting area: ca. 17 Å2/residue), in this case unfolding of the α-helix occurs at the interface.
    4) The limiting areas for a polymer were not so much affected by the initial spreading areas, indicating that the polypeptide conformation was identical in the close-packed state.
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  • Characteristics of Cellulose Acetate Membranes used for the Reverse Osmosis Process
    The Case of Symmetric Membranes
    Shoji Kimura, Jun Irie, Terukatsu Miyauchi
    1976 Volume 1 Issue 3 Pages 231-240
    Published: September 10, 1976
    Released on J-STAGE: October 21, 2010
    DOIhttps://doi.org/10.5360/membrane.1.231
    JOURNAL FREE ACCESS
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    To investigate more clearly the nature of the dense layer of asymmetric membranes used in the previous paper, symmetric membranes that consist only of dense layer were made from casting solutions of 4 different compositions. The symmetry of membranes were checked by the reverse osmosis experiment facing both sides of membranes to the high pressure. Using these membranes their perMeabilities and distribution coefficients of NaCl, water contents and thicknesses were determined. These results were combined to give diffusivities of NaCl in membrane, which are highly sensitive to the change of-water content. Its twofold change gives 2 orders of magnitude change of diffusivity. According to the free volume theory of Yasuda based on the concept of homogeneous membrane, diffusivity is dependent on φw, water content, as
    Ds=Dso exp [-v*/vf, H2O (1/φw-1)]
    Also according to the pore size distribution theory of Glueckauf based on the porous membrane concept, Ds is given as
    Ds=Dso φ4w
    Ds values from both of these equations coincide well with the experimental results obtained here. More experimental results with different solutes are necessary to get more clearer insights and unified understandings of separation mechanism.
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