JAXA Repository / AIREX 未来へ続く、宙(そら)への英知

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Other TitleCrystal growth mechanism associated with the interfacial adsorption of macro-molecules: Ice crystals and antifreeze proteins
Author(jpn)古川 義純; 横山 悦郎
Author(eng)Furukawa, Yoshinori; Yokoyama, Etsuro
Author Affiliation(jpn)北海道大学低温科学研究所; 学習院大学 計算機センター
Author Affiliation(eng)Institute of Low Temperature Science, Hokkaido University; Gakushuin University Computer Center
Issue Date2005-03
PublisherInstitute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA/ISAS)
Publication title宇宙利用シンポジウム 第21回 平成16年度
Space Utilization Research: Proceedings of the Twenty-first Space Utilization Symposium
Start page102
End page104
Publication date2005-03
AbstractIce crystal growth in supercooled water including certain proteins is inhibited by their adsorption at ice/water interface. While these proteins have dramatic consequence for natural biological processes and technological applications, only a little is known about the dynamic mechanism of ice growth inhibition. Recent experimental results are obviously different from the past understanding for the effect of AFGP (AntiFreeze GlycoProtein) molecules, in which the growth rates decrease by pinning the step motion at the adsorbed positions of molecules. The purpose of this research project is to clarify the growth kinetics of ice crystals growing in the supercooled water including the antifreeze protein molecules on the molecular level in conjunction with the theoretical considerations. The growth steps propagating on the interfaces between ice and water will be observed in-situ using the optical system of phase contrast microscopy, and the adsorbed protein molecules are directly using the fluorescent microscopy, which is combined with the phase contrast microscope. Combining both in-situ observations, the interaction between the growth steps and the adsorbed protein molecules will be analyzed. It is well known that not only the migration of growth step but also the macroscopic growth form are very sensitive to the convection flows in the liquid. Consequently, it is very important to conduct these experiments without any effect of convection flow. Based on these experimental results, a new model is developed to explain the growth promotion and inhibition mechanisms of the inorganic materials by the adsorption effects of macromolecules at the growing interface. This phenomenon that the growth of inorganic crystals is precisely controlled by the interfacial adsorption of the macromolecules such as the protein has been recently pushed to the forefront in the research field of crystal growth mechanisms. A new research prospect will be shown in this research project.
Keywordscrystal growth; adsorption; kinetic model; ice; protein; supercooling; growth kinetics; impurity diffusion; antifreeze protein; macromolecule; 結晶成長; 吸着; 運動モデル; 氷; タンパク質; 過冷却; 成長カイネティクス; 不純物拡散; 凍結抑制たんぱく質; 巨大分子
Document TypeConference Paper
JAXA Categoryシンポジウム・研究会

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