Kyushu University Academic Staff Educational and Research Activities Database
List of Papers
Ryo Akiyama Last modified date:2019.06.21

Associate Professor / Biochemistry Group / Department of Chemistry / Faculty of Sciences

1. Ayumi Suematsu, Takuto Sawayama, and Ryo Akiyama, Effective potential between negatively charged patches on acidic proteins immersed in various electrolyte solutions, The Journal of Chemical Physics, doi: 10.1063/1.5038912, 149, 074105-1-8, 2018.08, Effective interactions between O-sized anions in various electrolyte solutions were calculated by using
the integral equation theory with some simple models. The results indicated that only multivalent
cations mediated a strong effective attraction between O-sized anions at a certain concentration. The
effective interaction turned from repulsive to attractive as the electrolyte concentration increased,
and the effective attraction decreased when more electrolyte was added. Moreover, the effective interactions between O-sized anions in the electrolyte solution did not present a long repulsive tail, although the effective attraction caused by the divalent cations appeared. By contrast, the effective attraction mediated by monovalent cations and the reentrant behavior did not appear and the effective interaction was basically repulsive. These behaviors agree with the experimental results for reentrant condensation of acidic proteins in various electrolyte solutions. The calculated results suggest that the dissociated carboxylic acidic groups on the proteins form attractive patches between proteins under certain concentration conditions..
2. Yuka Nakamura, Akira Yoshimori, Ryo Akiyama, and Tsuyoshi Yamaguchi , Stick boundary condition at large hard sphere arising from effective attraction in binary hard-sphere mixtures , The Journal of Chemical Physics, doi: 10.1063/1.5025202 , 148, 124502-1-12, 2018.03.
3. Ken Tokunaga, and Ryo Akiyama, Basic cell size dependence of displacement for a solvation motor in a Lennard-Jones solvent , J. Comp. Chem. Jpn., 10.2477/jccj.2018-0004 , 17, 80-84, 2018.03.
4. Mafumi Hishida, Yoko Nomura, Ryo Akiyama, Yasuhisa Yamamura, and Kazuya Saito, Electrostatic double-layer interaction between stacked charged bilayers, Phys. Rev. E,, 96, 040601(R)-1-5, 2017.08.
5. Ayano Chiba, Masanori Inui, Yukio Kajihara, Kazuhiro Fuchizaki, Ryo Akiyama, Isotactic poly(4-methyl-1-pentene) melt as a porous liquid: Reduction of compressibility due to penetration of pressure medium, J. Chem. Phys. , 10.1063/1.4983508, 146, 194503-1-5, 2017.05.
6. Ayumi Suematsu, Akira Yoshimori, Ryo Akiyama, Effects of interactions between depletants in phase diagrams of binary hard-sphere systems, Europhys Letters(EPL),, 116, 38004-1-7, 2016.12.
7. Yuichi Kawabata, 秋山 良, Choice of the center of water molecules in calculations of partial molar volume of single ions immersed in water: A molecular simulation study, JOURNAL OF MOLECULAR LIQUIDS, 10.1016/j.molliq.2014.05.022, 200, 67-71, 2014.12.
8. Yuka Nakamura, 吉森 明, 秋山 良, Effects of the solvation structure on diffusion of a large particle in a binary mixture studied by perturbation theory, JOURNAL OF MOLECULAR LIQUIDS, 10.1016/j.molliq.2014.06.021, 200, 85-88, 2014.12.
9. Shingo Fujihara, 秋山 良, Attractive interaction between macroanions mediated by multivalent cations in biological fluids, JOURNAL OF MOLECULAR LIQUIDS, 10.1016/j.molliq.2014.06.022, 200, 89-94, 2014.12.
10. 秋山 良, Takumi Yamashita, Shingo Fujihara, Hidden peak of radial distribution function and effective attraction between like-charged proteins caused by translational motion of solvent molecules, JOURNAL OF MOLECULAR LIQUIDS, 10.1016/j.molliq.2014.06.004, 200, 72-76, 2014.12.
11. Yuka Nakamura, 吉森 明, 秋山 良, Perturbation Theory of Large-Particle Diffusion in a Binary Solvent Mixture, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 10.7566/JPSJ.83.064601, 83, 6, 064601-1-064601-9, 2014.06.
12. 久保田 陽二, Akira Yoshimori, Nobuyuki Matubayasi, Makoto Suzuki, Ryo Akiyama, Molecular dynamics study of fast dielectric relaxation of water around a molecular-sized ion, JOURNAL OF CHEMICAL PHYSICS, 10.1063/1.4769972, 137, 22, 224502-1-224502-4, 2012.12.
13. Yuko Inayoshi, 吉森 明, 秋山 良, Perturbation Theory of Large-Particle Diffusion, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 10.1143/JPSJ.81.114603, 81, 11, 114603-1-114603-10, 2012.11.
14. 久保田 陽二, Ryo Akiyama, Assessment of Three- Dimensional Distribution Functions and Triplet Distribution Functions for Hard Spheres Calculated using a Three- Dimensional Ornstein- Zernike Equation with Hypernetted- Chain Closure, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 10.1143/ JPSJS.81SA.SA017, 81, Supplement A, SA017-1-SA017-7, 2012.09.
15. 久保田 陽二, Ryo Akiyama, Model dependence of the electrostatic response to a molecular- sized ion in water, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 10.1143/ JPSJS.81SA.SA012, 81, Supplement A, SA012-1-SA012-6, 2012.09.
16. Yukio Kawashima, Satoshi Yamamoto, Tetsuya Sakata, Haruyuki Nakano, Katsura Nishiyama, Ryo Akiyama, Solvent Effect on the Fluorescence Spectra of Coumarin 120 in Water: A Combined Quantum Mechanical and Molecular Mechanical Study, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 10.1143/ JPSJS.81SA.SA024, 81, Supplement A, SA024-1-SA024-8, 2012.09.
17. Ken Tokunaga, Ryo Akiyama, A Model Study of the Conversion of Energy froma Chemical Reaction into Motion through a Solvation Motor, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 10.1143/ JPSJS.81SA.SA019, 81, Supplement A, SA019-1-SA019-9, 2012.09.
18. Yuka Nakamura, Akira Yoshimori, Ryo Akiyama, A Perturbation Theory for Friction of a Large Particle Immersed in a Binary Solvent, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 10.1143/ JPSJS.81SA.SA026, 81, Supplement A, SA026-1-SA026-7, 2012.09.
19. Ryo Akiyama, and Ryo Sakata , An Integral Equation Study of Reentrant Behavior in Attractive Interactions between Like-Charged Macroions Immersed in an Electrolyte Solution, J. Phys. Soc. Jpn., 10.1143/JPSJ.80.123602, 80, 123602, 2011.12.
20. Yasuhito Karino, Ryo Akiyama, and Masahiro Kinoshita , A Simple Theory for Entropic Interaction Induced between Large Spheres in a Binary Mixture of Small and Medium Spheres, J. Phys. Soc. Jpn., 10.1143/JPSJ.80.114802, 80, 114802, 2011.11.
21. Yoji Kubota and Ryo Akiyama, Fine Structure of the Dielectric Response to a Molecular-Sized Ion in Water, J. Phys. Chem. Lett., 10.1021/jz200571f, 2, 13, 1588–1591, 2011.06, [URL].
22. Ryo Akiyama, Yasuhito Karino, Hokuto Obama, Ayako Yoshifuku, Adsorption of xenon on a protein arising from the translational motion of solvent molecules, Phys. Chem. Chem. Phys. , 10.1039/b921314g, 12, 3096-3101, 12, 3096-3101 (Communication), 2010.03, [URL].
23. Yasuhito Karino, Ryo Akiyama, Effect of Solvent Granularity on the Activity Coefficient of Macromolecules, Chem. Phys. Lett., 478, 180-184 , 2009.08, [URL].
24. Yasuhito Karino, Ryo Akiyama, and Masahiro Kinoshita , Three-Dimensional Density Profiles of Small and Medium Spheres near a Pair of Large Spheres: Relevance to Entropic Interaction Induced between Large Spheres, J. Phys. Soc. Jpn., 78, 044801-1-6 , 2009.04.
25. Ryo Akiyama, Naohiko Fujino, Kouhei Kaneda, and Masahiro Kinoshita, Interaction between like-charged colloidal particles in aqueous electrolyte solution:
Attractive component arising from solvent granularity, Cond. Matt. Phys., 10, 587-596 , 2007.12, [URL].
26. Masahiro Kinoshita, Yuichi Harano, and Ryo Akiyama, Changes in thermodynamic quantities upon contact of two solutes in solvent under isochoric and isobaric conditions, J. Chem. Phys., 125, 244504-1-7 , 2006.12.
27. Ryo Akiyama, Yasuhito Karino, Yasuhiro Hagiwara, Masahiro Kinoshita, Remarkable Solvent Effects on Depletion Interaction in Crowding Media:
Analyses by the Integral Equation Theories, J. Phys. Soc. Jpn., 75, 064804-1-7 , 2006.05.
28. Antidispersive effect induced by parasperm contained in semen of
a cottid fish Hemilepidotus gilberti: Estimation by models and experiments.
29. Merchant, K.A.; Noid, W.G.; Akiyama, R; Finkelstein, I.; Goun, A.; McClain, B.L.; Loring, R.F.; Fayer,M.D., Myoglobin-CO Substate Structures and Dynamics: Spectrally Resolved Stimulated Vibrational Echoes and Molecular Dynamics Simulations, J. Am. Chem. Soc., (2003) Vol.125, p.13804., 2003.11.
30. Kusai A. Merchant, W. G. Noid, David E. Thompson, Ryo Akiyama, Roger F. Loring, and M. D. Fayer, Structural Assignments and Dynamics of the A Substates of MbCO: Spectrally
Resolved Vibrational Echo Experiments and Molecular Dynamics Simulations, J. Phys. Chem. B, Vol.107, p.4 (2003)., 2003.01.
31. Ryo Akiyama and Roger F. Loring, Vibrational Echoes for Classical and Quantum Solutes,, J. Chem. Phys., Vol. 116, p.4655(2002)., 2002.01.
32. Youichi Hayakawa, Ryo Akiyama, Hiroyuki Munehara and Akira Komaru, Dimorphic sperm influence semen distribution in a non-copulatory
sculpin Hemilepidotus gilberti,, Environmental Biology of Fishes., Vol.65, p.311(2002)., 2002.01.
33. Ryo Akiyama, Masahiro Kinoshita, and Fumio Hirata:, Free energy profiles of electron transfer at water-electrode interface
studied by the reference interaction site model theory, Chem. Phys. Lett., Vol.305, p.251(1999)., 1999.01.
34. Ryo Akiyama and Fumio Hirata, Theoretical Study for Water Structure at Highly Ordered Surface: Effect of
Surface Structure, J. Chem. Phys., Vol.108, p.4904 (1998)., 1998.01.
35. T. Kakitani, R. Akiyama, Y. Hatano, Y. Imamoto, Y. Shichida, P. Verdegem and J. Lugtenburg, Deuterium Substitution Effect on the Excited State Dynamics of Rhodopsin, J. Phys. Chem. B, Vol.102, p.1334 (1998) ., 1998.01.
36. Ryo Akiyama, Akira Yoshimori, Toshiaki Kakitani, Yasushi Imamoto, Yoshinori Shichida and Yasuyo Hatano, Analysis of Excited State Dynamics of 13-trans-Locked-Bacteriorhodopsin, J. Phys. Chem. A, Vol. 101, p.412 (1997)., 1997.01.
37. R. Akiyama, A. Yoshimori, T. Kakitani, Y. Imamoto, Y. Shichida and Y. Hatano:, Analysis of the temperature dependence of femtosecond excited state
dynamics of bacteriorhodopsin by spin-boson model,, Chem. Phys. Lett., Vol. 256, 165(1996)., 1996.01.
38. Ryo Akiyama, Toshiaki Kakitani, Yasushi Imamoto, Yoshinori Shichida and Yasuyo Hatano, Bacteriorhodopsin Analyzed by the Fourier Transform of Optical Absorption Spectra,, J. Phys. Chem., Vol. 99, 7147(1995)., 1995.01.
39. Ryo Akiyama, Masatoshi Kitaichi, Tomoharu Fujiwara and Sadashi Sawamura:, Short Lived Species Produced in Pulse Irradiaded Melts of LiF-KF and
LiF-NaF-KF Eutectic Mixtures, J. Nuc. Sci. Tech., Vol.31, p.250(1994), 1994.01.