巻号一覧
35 巻 (2008)
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35 巻, 2 号
選択された号の論文の8件中1～8を表示しています
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巻頭言
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伊佐 公男2008 年 35 巻 2 号 p. 67
発行日: 2008/03/31
公開日: 2022/11/20
ジャーナル フリーPDF形式でダウンロード (230K)
論文
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清水 由隆, 小棹 理子, 川路 均, 城所 俊一, 木村 隆良, 古賀 信吉, 澤田 豊, 西本 右子, 山崎 淳司, 吉田 博久, 加藤 ...2008 年 35 巻 2 号 p. 68-75
発行日: 2008/03/31
公開日: 2022/11/20
ジャーナル フリーWorking Group on Standardization in JSCTA conducted a round robin test (RRT) on temperature and enthalpy of phase transition of cyclohexane for validation as a reference material for calibration of DSC in low temperature. Nineteen organizations participated in the RRT. Extrapolated onset temperatures, peak temperatures and enthalpies of solid-solid phase transition and fusion were reported. In all results, variation among laboratories is larger than that within each laboratory. This result indicates that reproducibility of temperatures and enthalpies of phase transitions of cyclohexane by each laboratory are good, but some of the participants have biases in the measurement results. Cyclohexane is valid for calibration of DSC because of its good repeatability of temperatures and enthalpies of phase transitions. It is possible for DSC results to be more accurate from appropriate calibration by using cyclohexane.抄録全体を表示PDF形式でダウンロード (494K) -
杉本 華幸, 西矢 芳昭, 三宅 英雄, 田中 晶善2008 年 35 巻 2 号 p. 76-80
発行日: 2008/03/31
公開日: 2022/11/20
ジャーナル フリーStabilization mechanism of chloride ion on thermal denaturation of Arthrobacter sarcosine oxidase (SoxA) was investigated by calorimetric assays. The thermal unfolding of SoxA observed by differential scanning calorimetry was apparently irreversible. The temperature of unfolding was higher as higher concentration of chloride ions. The temperature of unfolding in the presence of chloride ions at a concentration of 1 M increased by 14 ºC, compared to the case in the absence of chloride ions. Isothermal titration calorimetry showed that a SoxA molecule bound a chloride ion with the dissociation constant of 86 μM. These calorimetric results suggested that a simplest mechanism that can explain the thermal unfolding of SoxA in the presence of chloride ion is as follows: NCl− ↔ U + Cl− and U → UF, where N, U, and UF represent SoxA in a native, reversibly unfolded, and irreversibly unfolded state, respectively. In this model, SoxA undergoes reversible unfolding with simultaneous dissociation of a chloride ion and subsequently the irreversible process occurs. The addition of a chloride ion shifts the equilibrium to favor the native-state side, resulting in an apparent stabilization.抄録全体を表示PDF形式でダウンロード (913K)
解説
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王 美涵, 関 成之2008 年 35 巻 2 号 p. 81-86
発行日: 2008/03/31
公開日: 2022/11/20
ジャーナル フリーThe present article introduces that thermal analysis of thin films are possible and useful. Thermal change of crystalline and amorphous indium-tin-oxide (ITO) transparent conducting films was investigated by temperature programmed desorption (TPD) and high-temperature X-ray diffraction (HT-XRD). Water vapor was the main gas released from the all films. Porous crystalline films released more water vapor than those from the dense ones. The thermal crystallization of amorphous films accompanied fast release of large amount of water vapor, which was attributed to disappearance of In-OH and Sn-OH bonds. The in-situ measurement of the crystallization process by HT-XRD analysis revealed that the thermal crystallization could be suppressed by the optimization of water vapor pressure during the sputter-deposition.抄録全体を表示PDF形式でダウンロード (1183K) -
前林 正弘, 香田 忍, 大場 正春2008 年 35 巻 2 号 p. 87-97
発行日: 2008/03/31
公開日: 2022/11/20
ジャーナル フリーCompressibility of boundary layers in polymer composites can be evaluated acoustically by applying a two states model based on a solvation model. In this tutorial paper, we introduced the method to characterize the elastic properties of the boundary layer, as well as features of acoustic characterizations for materials. Polyvinylchloride (PVC) and styrene-butadiene rubber (SBR) were used as polymer matrices. Calcium carbonate (CC) and carbon black (CB) were used as fillers and these were dispersed in the matrices. Velocities of elastic waves propagating in the PVC/CC and SBR/CB composites were measured by using two bulk wave velocity measurement systems. Acoustic images and surface wave velocities of the composites were measured with an acoustic microscope. Amount of boundary layers for the PVC/CC and SBR/CB composites were determined from the acoustic image and from the thermal gravimetric curve, respectively. The partial specific volume of those particles was almost same as the specific volume in each particle. Values of the partial specific adiabatic compressibility of the CC and CB were 1.4±0.7×10−10 Pa−1 and −0.5±0.5×10−10 Pa−1. These values suggested that the boundary layer in the PVC/CC composite was softer than the matrix and that in the SBR/CB composite was harder than the matrix.抄録全体を表示PDF形式でダウンロード (1521K) -
佐川 琢麻, 東 隆親, 佐々木 裕次2008 年 35 巻 2 号 p. 98-104
発行日: 2008/03/31
公開日: 2022/11/20
ジャーナル フリーAntibody, which is one of the most important proteins for adaptive immunity, has been well studied. In our previous studies, we showed the changes of antigen recognition mechanisms during antibody evolution and the structure changes of antibody with antigen-binding using thermodynamic and kinetic measurements. Since these structure changes were considered extremely small, we investigated the structural fluctuations of a single antibody molecule in real-time and space using a Diffracted X-ray Tracking method with pm-level accuracy. We found that the structural fluctuations of Fab fragments were various on each antibody clone and were suppressed by antigen-binding. In addition, we clarified that the ratio between the antigen-binding and non-binding conditions in the observed structural fluctuations is extremely relative to the binding-affinity or the Gibbs free energy change. These results indicate that the phenomena of antigen-antibody interactions considered stable states can be defined as the results of dynamical processes at the single-molecule level. Such new quantifications from angstrom-level structural fluctuations can be applied to various biological science and biotechnologies.抄録全体を表示PDF形式でダウンロード (662K) -
武藤 巧2008 年 35 巻 2 号 p. 105-112
発行日: 2008/03/31
公開日: 2022/11/20
ジャーナル フリーNeutron stars are expected to have highly dense nuclear matter in their inner core region with density several times larger than usual atomic nuclei. In such highly dense matter, mesons and hyperons having the "strangeness " quantum number can appear as well as nucleons (neutrons and protons) and electrons. In this article, we give an overview of recent theoretical developments on phase transitions of normal neutron-star matter to a new phase including condensation of kaons, the lightest mesons having the strangeness. We consider coexistence of kaon condensation and hyperons in highly dense matter and discuss the effects of the kaon-condensed phase in hyperonic matter on the internal structure of neutron stars such as mass-radius relations. In particular, a possible existence of self-bound objects with kaon condensates and hyperons on any scale is suggested.抄録全体を表示PDF形式でダウンロード (508K)
フロギストン
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2008 年 35 巻 2 号 p. 113-116
発行日: 2008/03/31
公開日: 2022/11/20
ジャーナル フリーPDF形式でダウンロード (255K)
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