巻号一覧
50 巻 (2023)
- 4 号 p. 126-
- 3 号 p. 89-
- 2 号 p. 63-
- 1 号 p. 1-
50 巻, 4 号
熱測定
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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解説
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矢田 詩歩, 吉村 倫一2023 年 50 巻 4 号 p. 126-132
発行日: 2023/10/25
公開日: 2023/11/17
ジャーナル 認証ありSurfactants are amphiphilic compounds with functional groups having opposite properties of hydrophobic and hydrophilic groups in a single molecule. Surfactants are used in a wide range of industrial fields, such as detergents, cosmetics, foods, pharmaceuticals, paints, and agrochemicals, because they adsorb at the interface and significantly change the properties of the interface, and have various effects such as washing, emulsifying, dispersing, solubilizing, foaming, and defoaming. To improve the properties and various functions for existing surfactants, various new surfactants have been developed. In this review, we report the novel surfactant: (1) polyoxypropylene-polyoxyethylene nonionic surfactants with a single chain length distribution, (2) homogeneous polyoxyethylene nonionic surfactants with multi-branched chains, (3) hydroxy group-containing amino acid surfactant. The adsorption and aggregation properties of these surfactants were characterized (cloud point, surface tension, dynamic light scattering, small-angle X-ray / neutron scattering, polarization microscopy, and cryogenic transmission electron microscopy.抄録全体を表示PDF形式でダウンロード (910K) -
猪股 直生2023 年 50 巻 4 号 p. 133-137
発行日: 2023/10/25
公開日: 2023/11/17
ジャーナル 認証ありThe fundamental principles of cells have not been clarified; however, we can follow biological phenomena inside cells by the temperature changes resulting from always-occurred intercellular biochemical reactions. The temperature sensing techniques for single cells are powerful tools for this purpose. This paper introduces micro/nano-temperature sensors using nanoparticle thermometers and microfabricated sensors, unique temperature signals from cells observed using microfabricated sensors, and evaluations of cellular thermophysical properties. Especially, the microfabricated thermometers and their applications to single-cell analysis are focused. These sensors, which have the advantages of high resolutions on temperature and time, could achieve the dynamic measurements of cellular temperature changes, then observed the periodic pulse heating, the temperature fluctuation and its frequency spectra, and temperature increase in local heating. Moreover, we obtained the cellular thermal conductivity and specific heat capacity via the dynamic temperature measurements in local heating. These thermophysical properties significantly depended on the surrounding temperature and frequency of local heating. These results show that cells have unknown functions and phenomena, and continuous developments of sensing technologies have important roles in clarifying the fundamental principles of cells.抄録全体を表示PDF形式でダウンロード (1311K) -
河原 一樹2023 年 50 巻 4 号 p. 138-143
発行日: 2023/10/25
公開日: 2023/11/17
ジャーナル 認証ありCollagen, the most abundant protein in mammals, not only provides tensile strength to tissues and organs, but also interacts with a myriad of proteins, namely collagen-binding proteins (CBPs), to regulate cell adhesion, growth, and differentiation. Despite their significant biological importance, the interactions between collagen and CBPs are poorly understood because of its insoluble, large, and anisotropic natures of collagen. In this review, I describe the recent progress in understanding the collagen-CBP interactions, which is primarily accelerated by the use of homo- and heterotrimeric collagen-like model peptides coupled with a variety of physicochemical and structural biological techniques. The detailed analyses on the collagen-CBP interactions are important for understanding the biological functions of collagen and its related diseases, and potentially provide a clue to develop novel collagen mimetic materials.抄録全体を表示PDF形式でダウンロード (1328K) -
藤田 麻哉, 杵鞭 義明, 中山 博行2023 年 50 巻 4 号 p. 144-149
発行日: 2023/10/25
公開日: 2023/11/17
ジャーナル 認証ありTo realize a latent-heat type solid-state heat storage substances, electronic phases and their transition are investigated in the viewpoint of thermal (latent-heat) features. VO2 (vanadium dioxide) exhibits an insulator-metal transition at around 67 degrees Celsius, accompanied by release/absorption of latent heat of about 250 J cm−3. Such a large latent heat, which is comparable to those of organic PCMs, is explained from strong coulomb interaction, or strong (electron) correlation by accounting the enthalpy-entropy exchange relation at the first-order transition, although a liftup influence of primary excitations in the ground state on an internal energy substantially reduces an effective amount of the latent heat. Compared to the influence of “moderate” correlation in the case of magnetic transition in 3d metallic system (La(Fe,Si)13), the latent heat became apparently larger in the strong correlation system, while the controllability by external fields as the “active” heat-storage ability is limited. As an excellent example of the active heat storage function, heat storage features for the NiTi - based material are introduced.抄録全体を表示PDF形式でダウンロード (659K)
フロギストン
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2023 年 50 巻 4 号 p. 150-151
発行日: 2023/10/25
公開日: 2023/11/17
ジャーナル 認証ありPDF形式でダウンロード (280K)
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