著者

小林 秀雄 浦川 理 金子 文俊 井上 正志

出版者

The Society of Rheology, Japan

雑誌

日本レオロジー学会誌 (ISSN:03871533)

巻号頁・発行日

vol.42, no.1, pp.19-23, 2014

被引用文献数

4

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The δ-cocrystal of syndiotactic polystyrene (sPS) can capsulate various small guest molecules in the cavity of the crystalline region. We examined the rotational motion of isolated polar guest molecule, benzonitrile (BN), caged in the crystalline cavities by dielectric spectroscopy and the results were compared with the previously reported data of sPS / methyl ethyl ketone (MEK) system. The relaxation of BN in the crystalline region was specified from the comparison with the dielectric data of atactic-PS / BN system in which only the amorphous phase exists. The rotational relaxation time of BN in the crystalline cavity was 6 orders of magnitude longer, and the activation energy of BN was twice larger than those of MEK. These results suggest that spatial restriction due to the small cavity size strongly retards the rotational dynamics of the larger guest molecule, BN. Two-site model could successfully describe the temperature dependence of the dielectric intensity for sPS / BN system, revealing that there exist two stable states of BN molecules with energy difference of 7.42 kJmol^{<font size="-1">-1</font>} in the crystalline cavity.

著者

片桐 千仭 金子文俊 金子文俊 長嶋 剣 剣 佐﨑 元 元

出版者

低温生物工学会

雑誌

低温生物工学会誌 (ISSN:13407902)

巻号頁・発行日

vol.67, no.1, pp.23-29, 2021 (Released:2021-06-18)

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In this short review, we introduce various aspects of insect body lipids, which have been progressively found to have many crucial physiological roles. The body-surface of insects is covered with cuticular lipids, mainly hydrocarbons. The cuticular hydrocarbons are synthesized in specialized cells called oenocytes residing beneath the epidermis. The hydrocarbons synthesized are transported to the outermost layer, wax layer, by the circulating lipoprotein, lipophorin. Although the principal role of the wax layer is the protection of internal body from desiccation, the essential features vary depending on insect species and development stage. The diapausing pupae of large and small cabbage white butterflies change the thickness and unsaturation of their cuticular hydrocarbons from their non-diapausing ones. The cuticular hydrocarbons also contribute to chemical communications. The unsaturated hydrocarbons of male crickets play an important role for sex discrimination before copulation. Modern in-situ surface analytical methods have a potential to provide more abundant and precise information about the structure and physicochemical properties of the cuticular hydrocarbons. Recent ATR FTIR spectroscopic studies indicated the necessity of correction in the phase-separation model of cuticular hydrocarbons proposed by A. G. Gibbs.

著者

福原 朗子 小川 直久 金子 文俊

出版者

公益社団法人日本工学教育協会

雑誌

工学教育研究講演会講演論文集

巻号頁・発行日

vol.25, no.61, pp.336-337, 2013-08-29