巻号一覧
1 巻 (1976)
- 4 号 p. 250-
- 3 号 p. 166-
- 2 号 p. 82-
- 1 号 p. 1-
1 巻, 3 号
選択された号の論文の9件中1～9を表示しています
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堀田 健1976 年 1 巻 3 号 p. 166-175
発行日: 1976/09/10
公開日: 2010/10/21
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品川 嘉也1976 年 1 巻 3 号 p. 176-183
発行日: 1976/09/10
公開日: 2010/10/21
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1976 年 1 巻 3 号 p. 183
発行日: 1976年
公開日: 2010/10/21
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吉田 賢右1976 年 1 巻 3 号 p. 184-186
発行日: 1976/09/10
公開日: 2010/10/21
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丹沢 宏1976 年 1 巻 3 号 p. 187-196
発行日: 1976/09/10
公開日: 2010/10/21
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松浦 剛1976 年 1 巻 3 号 p. 197-211
発行日: 1976/09/10
公開日: 2010/10/21
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神経ミエリンの場合真崎 規夫1976 年 1 巻 3 号 p. 213-224
発行日: 1976/09/10
公開日: 2010/10/21
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山下 卓哉, 山下 伸典1976 年 1 巻 3 号 p. 225-230
発行日: 1976/09/10
公開日: 2010/10/21
ジャーナル フリー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.抄録全体を表示PDF形式でダウンロード (773K) -
対称性膜の場合木村 尚史, 入江 遵, 宮内 照勝1976 年 1 巻 3 号 p. 231-240
発行日: 1976/09/10
公開日: 2010/10/21
ジャーナル フリー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.抄録全体を表示PDF形式でダウンロード (1208K)
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