Shun N. Watanabe

Reserc topic

Morophological Developments

As a seed of sunflower grows to sunflower shape, can we make a artificial seed to grow as a shape designated as you like?

Morophological Developments are the term of biology, which means that growing to complicated final shapes from seeds. Cells in a growing organizatation are communiocating each other with signal molecules by diffusion and the communication desides the final shape of the organization. So to speak, this is a application of diffusion type of molecular communication.

A. Turing found that combination of diffusion and chemical reaction can be principle mechanism to deside the final shape and he showed Turing patterns. Reasently, S. Kondo showed that the charactristics of the growing pattern on skin of Angelefish is the same with Turing pattern. The mechanism are called as a Diffusion-Reaction phenomenon. The charactristics are well analyed by mathematics.

Diffusion-reaction phenomenono can develop almost all shapes. However, no one can derive initial state for desired pattern, because the equation of diffusion reaction cannot revise the time.

By analysing the equation using geometory, we have found one of the method to derive a initial condition for desiend shapes. [1]

CV

EDUCATIONS

Doctor of Philosophy, Science - 2009 (expected)
Kyoto University, Graduate School of Science - Kyoto, Japan.
Thesis Title: Nonlinear Response Phenomenon in a Micrometer Scale
Master of Science - March 2004
Kyoto University, Graduate School of Science - Kyoto, Japan.
Thesis Title: First Phase Transition of Actin Filament Bundling Formation.
Bachelor of Science - March 2002
Keio University, Department of Physics, Faculty of Science and Technology - Yokohama, Japan.
Thesis Title: Molecular Dynamics Analysis of Liquid-Solid Phase Transition of Particles under the Lennard-Jones Potential.

PUBLICATIONS

2009

^ Shun N. Watanabe and Suda Tatsuya, "Encoding Spatial Paterns into a Chemical Regulatory Network," UCI Technical Report, No. 09-04, Aug. 2009.
S. N. Watanabe, T. Nakano, A. Enomoto, M. J. Moore and T. Suda, "Self-organization in Molecular Communication," (Tentative) Self-organization handbook, published by NTS inc., 2009.

2008

2007

S. N. Watanabe, T. Iwaki, M. I. Kohira, N. Magome and K. Yoshikawa, "Negative Photophoresis of Smoke Particles," Physica D, submitted, 2007.

2006

M. Hase, S. N. Watanabe and K. Yoshikawa, "Rhythmic Motion of a Droplet under a Dc Electric Field" Physical Review E, Vol. 74 (4), pp 046301-5, 2006.
S. N. Watanabe, K. Yoshikawa, T. Iwaki, M. I. Kohira and N. Magome, "Light Intensity Dependence of Negative Photophoretic Velocity on Smoke Droplets." Space Utilization Research (Tokyo, Japan), Vol. 22, pp. 176-179, Jan., 2006.
S. N. Watanabe and K. Yoshikawa, "Bundling Transition of F-actin," Proceedings of 2006 International Symposium on Micromechatronics and Human Science (Nagoya, Japan), pp. 52-55, November, 2006.

2005

S. Watanabe, "Thickness Measurement of a Actin-Bundle in Aqueous Solution," Soft Matter as Structured Materials (Kyoto, Japan), August, 2005.

2004

S. Watanabe and T. Ito, "Mechanism of Bundling Transition of Actin-Filament Induced by Multivalent Cation," Dynamics of Complex Flied (Kyoto, Japan), February, 2004.
S. Watanabe, "Thickness Measurement of Actin Filament Bundle," Yukawa Institute for Theoretical Physics Workshop 2004 "Soft Matter Physics" (Kyoto, Japan), August, 2004.

2003

S. Watanabe and T. Ito, "Bundling Formation of Actin Filaments," Yukawa Institute for Theoretical Physics Workshop 2003 "Soft Matter Physics, 2003" (Kyoto, Japan), August, 2003.

PRESENTATIONS

Y. Suzuki and S. N. Watanabe, "Non-Equilibrium Dynamics Induced by Laser Insertion," The Physical Society of Japan, the Spring Annual Meeting, 2007 (Kagoshima, Japan), March, 2007.
S. N. Watanabe, "Spontaneous Generation of Micro Droplets on a Glass Surface," The Physical Society of Japan, the Spring Annual Meeting, 2007 (Kagoshima, Japan), March, 2007.
Y. Suzuki and S. N. Watanabe, "Micro Meter Scale Concentration Gradient Induced by Laser Irradiation," The Physical Society of Japan, the Fall Annual Meeting, 2006 (Chiba, Japan), September, 2006.
S. N. Watanabe, "Relationship of the Thickness of Actin-Bundle with Additional Cation Concentration," The Physical Society of Japan, the Fall Annual Meeting, 2005 (Kyoto, Japan), September, 2005.
S. N. Watnaabe, T. Iwaki, M. Kohira and N. Magome, "Photophoresis in a Convergent Laser Beam," The Physical Society of Japan, the Fall Annual Meeting, 2005 (Kyoto, Japan), September, 2005.
S. Watanabe, "Bundling Formation of Actin Filament Induced by Multivalent Cation 3," The Physical Society of Japan, the Spring Annual Meeting, 2004 (Fukuoka, Japan), May, 2004.
S. Watanabe, N. Matsuda, N. Magome, S. Kohira, Y. Sumino, H. Isomura and E. Hayata, "Photophoresis Phenomenon:Smoke Particles Move Toward a Light Source," The Physical Society of Japan, the Fall Annual Meeting, 2004 (Aomori, Japan), September, 2004.
S. Watanabe, "Bundling Formation of Actin Filament Induced by Multivalent Cation," The Physical Society of Japan, the Spring Annual Meeting, 2003 (Sendai, Japan), May, 2003.
S. Watnaabe and T. Ito, "Bundling Formation of Actin-Filament Induced by Multivalent Cation 2," The Physical Society of Japan, the Fall Annual Meeting, 2003 (Okayama, Japan), September, 2003.

ADDITIONAL

A member of “The Physical Society of Japan”, from 2003.

A member of an executive committee of “The Young Scientist Community of Biophysics”, from 2003 to 2006.