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en: Roles of Sterols in Biological Membranes: Heterogeneous Structure and Functional Expression

ja: 生体膜におけるステロールの役割:不均一構造と機能発現

en: MEMBRANE

ja: 膜


en: Membrane States of Saturated Glycerophospholipids: A Thermodynamic Study of Bilayer Phase Transitions

en: Chemical & Pharmaceutical Bulletin

ja: Chemical & Pharmaceutical Bulletin


en: Pressure Perturbation Calorimetry: Application to Lipid Membranes

ja: 圧力摂動熱量測定:脂質膜への適用

en: Pressure perturbation calorimetry (PPC) is a novel calorimetric technique which allows us to obtain information about volumetric properties of solute molecules and colloidal particles in aqueous solutions. A PPC calorimeter has basically the same architecture as a high-sensitivity power-compensation differential scanning calorimeter, but it can measure the heat quantity transferred from or into a sample solution during the course of an isothermal small pressure change by attaching an external accessary for pressure control to the calorimeter. This heat quantity can be related to the expansion coefficient α, and thus, the temperature dependence of α can be obtained by performing PPC scans at a series of different temperatures. This article describes the application of PPC to the investigation of volume behavior of phospholipid bilayer membranes on the basis of our previous studies along with the general thermodynamic background of the PPC technique. We also give a concise explanation of how to analyze the PPC data, because we modified the conventional data analysis method to evaluate the absolute values of volume changes with bilayer phase transitions.

en: Netsu Sokutei

ja: 熱測定


en: ホスファチジルエタノールアミン二重膜の温度および圧力誘起相転移

ja: ホスファチジルエタノールアミン二重膜の温度および圧力誘起相転移


en: Association Behavior of Double Chain Ionic Surfactants: Elucidation of the Membrane States by High-pressure Study

ja: 二本鎖イオン性界面活性剤の会合挙動:高圧力研究による膜状態の解明

en: The bilayer phase transitions of double-chain cationic surfactants, dialkyldimethylammonium bromides (2CnBr), at ambient and high pressures were investigated. The 2CnBr bilayers underwent a single or multiple phase transitions depending on the alkyl-chain length. Comparing the phase-transition properties among the 2CnBr bilayers, the temperature pressure phase diagrams and thermodynamic quantities for the phase transitions were determined. We could comprehensively interpret the complicated phase behavior of the 2CnBr bilayers, which has not been revealed by conventional experimental methods at ambient pressure.

en: The Review of High Pressure Science and Technology

ja: 高圧力の科学と技術


en: コレステロールが誘起する脂質膜側方相分離の熱力学的考察

ja: コレステロールが誘起する脂質膜側方相分離の熱力学的考察


en: Quantitative Observation of Volume and Relaxation Behavior of Phospholipid Bilayers by Pressure Perturbation Calorimetry

ja: 圧力摂動熱量法によるリン脂質二分子膜の体積挙動および緩和挙動の定量的観測

en: Pressure perturbation calorimetry (PPC) is a relatively new calorimetric technique which allows us to investigate volume behavior of solute molecules in aqueous solutions or colloidal particles in aqueous dispersions. This article deals with the application of the PPC technique to phospholipid vesicle dispersions along with a brief description about the theoretical aspect of this technique on the basis of our recent studies on the volume and relaxation behavior of phospholipid bilayers.


en: 脂質ラフトは熱力学的に説明できるのか?―非調和融点型固液相図とクラスター形成―

ja: 脂質ラフトは熱力学的に説明できるのか?―非調和融点型固液相図とクラスター形成―

en: Seibutsu Butsuri

ja: 生物物理


en: 飽和ジアシルホスファチジルコリン二重膜の温度および圧力誘起相転移

ja: 飽和ジアシルホスファチジルコリン二重膜の温度および圧力誘起相転移


en: Membrane States of Lipids in Biological Membranes -Structure-Function Relationship Revealed from Pressure Study-

ja: 生体膜脂質の膜状態 -圧力研究から見えてくる構造機能相関-

en: Bilayer-membrane properties of the most frequently used lipid in membrane studies, dipalmitoylphosphatidylcholine (DPPC), are described. And then, barotropic bilayer phase behavior of various kinds of phospholipids with a different molecular structure from DPPC is explained in comparison with that of the DPPC bilayer. A slight difference in the molecular structure has a marked influence on the membrane state of the bilayer. Systematic pressure study using the DPPC bilayer enables us to understand the role and meaning of various phospholipids existing in biological membranes.


en: Thermotropic and Barotropic Phase Behavior of Phosphatidylcholine Bilayers --- Phospholipids: Molecular Sciences 2012

en: International Journal of Molecular Sciences


en: Barotropic Phase Transitions of Asymmetric Phospholipid Bilayer Membranes : Molecular Asymmetry and Phase Stability

ja: 非対称リン脂質二重膜の高圧相転移:分子非対称性と相安定性

en: The effect of pressure on the bilayer phase transitions of two kinds of asymmetric phospholipids, phosphatidylcholines (PCs) with different saturated acyl chains in the sn-1 and sn-2 positions on the glycerol backbone and mixed-chain PCs with an unsaturated acyl chain in the sn-1 or sn-2 position, is described. The alignment of the sn-1 and sn-2 acyl chains at the therminal methyl ends and the mismatch of the effective chain length between the sn-1 and sn-2 acyl chains produce a significant influence on their bilayer properties. The correlation between molecular asymmetry of PC molecules and phase stabilities of the bilayer membranes is discussed.


en: 高圧力下における脂質膜の構造転移と相挙動

ja: 高圧力下における脂質膜の構造転移と相挙動

en: Journal of the Society of Materials Science, Japan

ja: 材料


en: リン脂質二重膜の圧力誘起指組み構造形成

ja: リン脂質二重膜の圧力誘起指組み構造形成

en: Colloid & Interface Communication

ja: コロイドアンドインターフェースコミュニケーション


en: Pressure-induced Interdigitation in Phospholipid Bilayer Membranes

ja: リン脂質二分子膜における圧力誘起指組み構造形成

en: Pressure studies on the bilayer phase transitions of ester-linked diacylphosphatidylcholines (diacyl-PCs) and ether-linked dialkyl-PCs are reviewed. Comparing the bilayer phase diagrams and the thermodynamic quantities of phase transitions for diacyl-PCs with those for dialkyl-PCs, the difference in lateral interaction between polar head groups of diacyl-PC and dialkyl-PC was elucidated. The mechanism of bilayer interdigitation induced by high-pressure, which is characteristic of phospholipids with a choline head group, is discussed on the basis of molecular interaction in lipid bilayer membranes.


en: Diversity of Cellulose Molecules Observed in the Solution

ja: 溶液でみえるセルロース分子の多様性

en: Cellulose Communications

ja: Cellulose Communications