巻号一覧
26 巻 (2001)
- 6 号 p. 236-
- 5 号 p. 194-
- 4 号 p. 164-
- 3 号 p. 110-
- 2 号 p. 66-
- 1 号 p. 2-
26 巻, 4 号
選択された号の論文の5件中1～5を表示しています
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高桑 雄一2001 年 26 巻 4 号 p. 164-170
発行日: 2001/07/01
公開日: 2011/03/04
ジャーナル フリーThe plasma membrane plays important roles in maintaining specific intracellular environment, allowing the cell to be an autonomous biological unit. The basic structure of the plasma membrane was originally proposed as the “fluid mosaic model” by Singer and Nicolson in 1972. Investigation has accumulated knowledge that enables us to regard the plasma membrane as the “trilayer”, including the membrane skeleton which underlies the lipid bilayer (see Fig. 1). The structure and function of the membrane skeleton has been extensively studied using the red cell membranes. Moreover, this network system has been shown to exist in other cells as well. In the present review, through taking a view of plasma membrane from inside the cell (see Fig. 2), the structure-function correlation of the red cell membrane skeleton and its regulations are summarized.抄録全体を表示PDF形式でダウンロード (1599K) -
増田 俊夫2001 年 26 巻 4 号 p. 171-178
発行日: 2001/07/01
公開日: 2011/03/04
ジャーナル フリーThis review article surveys the synthesis and properties of substituted polyacetylenes, especially those which exhibit high gas permeability, such as poly [1- (trimethylsilyl) -1-propyne] [poly (TMSP)] and poly (diphenylacetylene) [poly (DPA)] derivatives. Poly (TMSP) having high molecular weight up to around 1 × 106 can be obtained by the metathesis polymerization of TMSP catalyzed by TaCl5 and NbCl5. This polymer is characterized by good solubility in many common solvents, formation of tough films by solution casting, a high glass transition temperature (> 250 °C), and fairthermal stability. Its oxygen permeability (Po2) at 25 °C reaches ca. 6, 000 barrers, which is the highest value of all existing polymers. The gas permeation properties of poly (TMSP) are reviewed. The TaCl5/n-Bu4Sn system is effective for the polymerization of DPAs. Most of the produced polymers are soluble in organic solvents, thermally highly stable, and film-forming by solution casting. Interestingly, large Po2 values (1, 100 barrers) are observed with poly (DPAs) bearing bulky spherical para-substituents. Desilylation of p-Me3Si-containing poly (DPA) membrane yields poly (DPA) membrane, which shows high Po2 of-6, 000 barrers.抄録全体を表示PDF形式でダウンロード (923K) -
後藤 雅宏2001 年 26 巻 4 号 p. 179-184
発行日: 2001/07/01
公開日: 2011/03/04
ジャーナル フリーReversed micelles create unique environment in organic media. They are capable of solubilizing hydrophilic biomolecules (e.g., proteins, peptides, amino acids, DNA) in their aqueous interior. This feature brings about the practical use of biomaterials in organic media because reversed micelles can solubilize them preserving their intrinsic activity. In this article, we focus on novel biological application of reversed micelles : purification of biomolecules (proteins and DNAs), protein renaturation, and the detection of unusual sequence of DNAs. In the reversed micellar phase, denatured proteins are completely reactivated under optimum conditions. This novel refolding technique facilitates a high renaturation yield at high protein concentration. Recently, the reversed micelle is found to be a useful tool not only for protein separation but also for protein renaturation. Furthermore, we achieved the extraction of DNAs from an aqueous solution into isooctane using reversed micelles. The degree of extraction of DNAs was strongly influenced by the type of surfactant in the organic solvent and ionic strength in the aqueous phase. The driving force of the DNA transfer was electrostatic interaction between cationic surfactants and the negatively charged DNA. Cationic surfactants possessing two long-alkyl chains are the best candidate for the successful transfer of DNAs from the aqueous solution to the reversed micellar solution. We also succeeded in detecting the targeted DNAs that have a missmatched sequence by utilizing a reversed micellar solution.抄録全体を表示PDF形式でダウンロード (806K) -
Masakazu Yoshikawa, Yasuko Asano, Michael D. Guiver2001 年 26 巻 4 号 p. 185-188
発行日: 2001/07/01
公開日: 2011/03/04
ジャーナル フリーBPA imprinted polyamide membranes as well as control membranes recognized BPA in preference to its analogue DPP and selectively permeated BPA from BPA/DPP mixtures. The imprinted membranes showed higher adsorption selectivity and permselectivity than the control membrane. The adsorption selectivity of the imprinted membranes reached 135 and permeated BPA 3.7 times faster than the control membrane.抄録全体を表示PDF形式でダウンロード (400K) -
加藤 典昭, 櫻井 秀彦2001 年 26 巻 4 号 p. 189-191
発行日: 2001/07/01
公開日: 2011/03/04
ジャーナル フリーPDF形式でダウンロード (336K)
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