Updated on 2024/09/20

写真a

 
WAKITA Junichi
 
Organization
Faculty of Science and Engineering Professor
Other responsible organization
Physics Course of Graduate School of Science and Engineering, Master's Program
Physics Course of Graduate School of Science and Engineering, Doctoral Program
Contact information
The inquiry by e-mail is 《here
External link

Degree

  • 博士(理学) ( 中央大学 )

  • 修士(理学) ( 中央大学 )

Education

  • 1997.3
     

    Chuo University   Graduate School, Division of Science and Engineering   doctor course   completed

  • 1994.3
     

    Chuo University   Graduate School, Division of Science and Engineering   master course   completed

  • 1992.3
     

    Chuo University   Faculty of Science and Engineering   graduated

Research History

  • 2017.4 -  

    中央大学理工学部教授

  • 2011.4 - 2017.3

    中央大学理工学部准教授

  • 2010.4 - 2011.3

    中央大学理工学部兼任講師

  • 2006.4 - 2010.3

    中央大学理工学部教育技術員

  • 2005.4 - 2006.3

    株式会社シーエステクノロジー

  • 2003.5 - 2005.3

    株式会社シーエスネット

  • 2001.4 - 2003.4

    株式会社アドバンストアルゴリズム&システムズ

  • 1997.4 - 2001.3

    中央大学理工学部教育技術員

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Professional Memberships

  • 日本物理学会

Research Interests

  • "Active Matter, Fractal Physics, Statistical Physics"

Research Areas

  • Natural Science / Mathematical physics and fundamental theory of condensed matter physics  / Mathematical physics/Fundamental condensed matter physics

Papers

  • Cell population migration cycle and response to environmental pH in Bacillus subtilis

    Sohei Tasaki, Madoka Nakayama, Izumi Takagi, Jun-ichi Wakita, Wataru Shoji

    2020.9

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    Publisher:Cold Spring Harbor Laboratory  

    <title>Abstract</title>Microbial populations are ubiquitous and some form a robust, multicellular structure called biofilm that protects the cells from environmental damage. The dispersion cycle is critical for controlling the population of important target microbes (both pathogenic and beneficial). Here, we show that the hysteresis of <italic>Bacillus subtilis</italic> cell-type regulation with respect to auto-inducing signal strength triggers the migration cycle of the cell population. We investigate migration cycle and its dependence on environmental conditions by quantitative analysis of cyclically expanding, concentric circular colonies. Next, we construct an input/output model that controls cell types in response to environmental conditions and signal density. On the basis of this model, we propose a migration cycle model for cell populations. The proposed model will widely predict biofilm-related phenomena and provide the basis for the description of highly self-regulating multicellular systems.

    DOI: 10.1101/2020.09.11.292474

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  • Cell-cell and Cell-noise Interactions of Bacterial Cells in a Shallow Circular Pool and Transitions of Collective Motions Reviewed

    R. Honda, S. Umeda, J. Wakita

    J. Phys. Soc. Jpn.   88   054005   2019.4

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Physical Society of Japan  

    DOI: 10.7566/JPSJ.88.054005

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  • Analysis of a Stochastic Model for Bacterial Growth and the Lognormality of the Cell-Size Distribution Reviewed

    Ken Yamamoto, Jun-ichi Wakita

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   85 ( 7 )   074004   2016.7

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:PHYSICAL SOC JAPAN  

    This paper theoretically analyzes a phenomenological stochastic model for bacterial growth. This model comprises cell division and the linear growth of cells, where growth rates and cell cycles are drawn from lognormal distributions. We find that the cell size is expressed as a sum of independent lognormal variables. We show numerically that the quality of the lognormal approximation greatly depends on the distributions of the growth rate and cell cycle. Furthermore, we show that actual parameters of the growth rate and cell cycle take values that give a good lognormal approximation; thus, the experimental cell-size distribution is in good agreement with a lognormal distribution.

    DOI: 10.7566/JPSJ.85.074004

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  • Phase Diagram of Collective Motion of Bacterial Cells in a Shallow Circular Pool Reviewed

    Jun-ichi Wakita, Shota Tsukamoto, Ken Yamamoto, Makoto Katori, Yasuyuki Yamada

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   84 ( 12 )   124001   2015.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:PHYSICAL SOC JAPAN  

    The collective motion of bacterial cells in a shallow circular pool is systematically studied using the bacterial species Bacillus subtilis. The ratio of cell length to pool diameter (i.e., the reduced cell length) ranges from 0.06 to 0.43 in our experiments. Bacterial cells in a circular pool show various types of collective motion depending on the cell density in the pool and the reduced cell length. The motion is classified into six types, which we call random motion, turbulent motion, one-way rotational motion, two-way rotational motion, random oscillatory motion, and ordered oscillatory motion. Two critical values of reduced cell lengths are evaluated, at which drastic changes in collective motion are induced. A phase diagram is proposed in which the six phases are arranged.

    DOI: 10.7566/JPSJ.84.124001

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  • Self-Elongation with Sequential Folding of a Filament of Bacterial Cells Reviewed

    Ryojiro Honda, Jun-Ichi Wakita, Makoto Katori

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   84 ( 11 )   114002   2015.11

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    Under hard-agar and nutrient-rich conditions, a cell of Bacillus subtilis grows as a single filament owing to the failure of cell separation after each growth and division cycle. The self-elongating filament of cells shows sequential folding processes, and multifold structures extend over an agar plate. We report that the growth process from the exponential phase to the stationary phase is well described by the time evolution of fractal dimensions of the filament configuration. We propose a method of characterizing filament configurations using a set of lengths of multifold parts of a filament. Systems of differential equations are introduced to describe the folding processes that create multifold structures in the early stage of the growth process. We show that the fitting of experimental data to the solutions of equations is excellent, and the parameters involved in our model systems are determined.

    DOI: 10.7566/JPSJ.84.114002

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  • Dynamical Properties in Uniform and Periodic Growth Modes of Ascorbic Acid Crystal Domain from Thin Solution Film Reviewed

    Yoshihiro Yamazaki, Mitsunobu Kikuchi, Akihiko Toda, Jun-ichi Wakita, Mitsugu Matsushita

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   83 ( 6 )   064002   2014.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:PHYSICAL SOC JAPAN  

    There exists a threshold-sensitive dynamical transition between uniform and periodic growth modes in the domain growth of ascorbic acid crystals from its aqueous supersaturated solution film. The crystal growth induces solution flow. Humidity controls the fluidity of the solution. The solution flow varies the film thickness. The threshold exists in the thickness of the solution film. If the thickness becomes lower than the threshold, the solution flow and the crystal growth almost stop.

    DOI: 10.7566/JPSJ.83.064002

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  • "Average-Value Paradox" of the Lognormal Distribution Reviewed

    Ken Yamamoto, Jun-ichi Wakita

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   82 ( 11 )   113001   2013.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:PHYSICAL SOC JAPAN  

    This letter reports seemingly paradoxical behavior of the average of a lognormal distribution. The authors consider a simple stochastic process given by multiplication of uniform random variables. The central limit theorem ensures that a lognormal distribution is asymptotically a good approximation to the actual distribution. Nevertheless, the average of this approximate distribution deviates from the true value. As a solution to this conflict, the authors clarify that the average is generally not preserved under a nonlinear transformation of a random variable, and this causes the disagreement of the lognormal approximation. Instead of the average, the median is proved to be compatible with such a transformation.

    DOI: 10.7566/JPSJ.82.113001

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  • Effects of urea on length distribution and morphology of Escherichia coli and Reviewed

    M. Fujihara, J. Wakita, D. Kondoh, M. Matsushita, R. Harasawa

    African journal of microbiology research   7 ( 18 )   1780 - 1786   2013.4

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:academic journals  

    DOI: 10.5897/AJMR12.1102

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  • 尿素ブロスで増殖したEscherichia coliフィラメント細胞の形態学的・遺伝学的解析(Morphological and genetic analyses of filamentous Escherichia coli grown in urea broth)

    藤原 正俊, 脇田 順一, 松下 貢, 原澤 亮

    日本細菌学雑誌   67 ( 1 )   140 - 140   2012.2

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  • Statistical Features of Complex Systems -Toward Establishing Sociological Physics- Reviewed

    Naoki Kobayashi, Hiroto Kuninaka, Jun-ichi Wakita, Mitsugu Matsushita

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   80 ( 7 )   072001   2011.7

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    Complex systems have recently attracted much attention, both in natural sciences and in sociological sciences. Members constituting a complex system evolve through nonlinear interactions among each other. This means that in a complex system the multiplicative experience or, so to speak, the history of each member produces its present characteristics. If attention is paid to any statistical property in any complex system, the lognormal distribution is the most natural and appropriate among the standard or "normal" statistics to overview the whole system. In fact, the lognormality emerges rather conspicuously when we examine, as familiar and typical examples of statistical aspects in complex systems, the nursing-care period for the aged, populations of prefectures and municipalities, and our body height and weight. Many other examples are found in nature and society. On the basis of these observations, we discuss the possibility of sociological physics.

    DOI: 10.1143/JPSJ.80.072001

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  • Size Distribution of Bacterial Cells in Homogeneously Spreading Disk-like Colonies by Bacillus subtilis Reviewed

    Jun-ichi Wakita, Hiroto Kuninaka, Tohey Matsuyama, Mitsugu Matsushita

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   79 ( 9 )   094002   2010.9

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    We have experimentally investigated size distribution of bacterial cells at the circumference of homogeneously spreading disk-like colonies formed by Bacillus subtilis, and found that the size distribution of bacterial cells shows lognormal. We have developed a phenomenological model based on the experimental results for the growth process of bacterial cells and confirmed that the model reproduces a lognormal distribution of bacterial cell size which is very close to our experimental result. Our results indicate that both the lognormal distributions of cell cycle and cell growth rate are essential for the lognormal distribution of bacterial cell size.

    DOI: 10.1143/JPSJ.79.094002

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  • Concentric-ring-like Colony of P. mirabilis

    S. Tonomura, S. Ebara, T. Yoshino, J. Wakita, T. Matsuyama, M. Matsushita

    Proceedings of the 9th Asia-Pacific Complex Systems Conference, (2009).   412 - 412   2009.11

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  • Homogeneously Spreading Disk-like Colonies by B. subtilis

    J. Wakita, T. Matsuyama, M. Matsushita

    Proceedings of the 9th Asia-Pacific Complex Systems Conference, (2009).   419 - 419   2009.11

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  • Concentric-ring pattern formation of bacterial colonies of Escherichia coli

    T. Yoshino, S. Ebara, S. Tonomura, R. Tokita, T. Katoh, Y. Maeda, J. Wakita, M. Sano, T. Matsuyama, M. Matsushita

    Proceedings of the 9th Asia-Pacific Complex Systems Conference, (2009).   414 - 414   2009.11

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  • Pattern Formation of Bacterial Colonies by Escherichia coli

    S. Ebara, T. Yoshino, S. Tonomura, R. Tokita, T. Kato, Y. Maeda, J. Wakita, M. Sano, T. Matsuyama, M. Matsushita

    Proceedings of the 9th Asia-Pacific Complex Systems Conference, (2009).   416 - 416   2009.11

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  • Pattern Formation of Bacterial Colonies by Escherichia coli Reviewed

    Rie Tokita, Takaki Katoh, Yusuke Maeda, Jun-ichi Wakita, Masaki Sano, Tohey Matsuyama, Mitsugu Matsushita

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   78 ( 7 )   704005   2009.7

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    We have studied the morphological diversity and change in bacterial colonies, using the bacterial species Escherichia coli, as a function of both agar concentration C-a and nutrient concentration C-n. We observed various colony patterns, classified them into four types by pattern characteristics and established a morphological diagram by dividing it into four regions. They are regions A [diffusion-limited aggregation (DLA)-like], B (Eden-like), C (concentric-ring), and D (fluid-spreading). In particular, we have observed a concentric-ring colony growth for E. coli. We focused on the periodic growth in region C and obtained the following results: (i) A colony grows cyclically with the growing front repeating an advance (migration phase) and a momentary rest (consolidation phase) alternately. (ii) The growth width L and the bulge width W in one cycle decrease asymptotically to certain values, when C-a is increased. (iii) L does not depend on C-n, while W is an increasing function of C-n. Plausible mechanisms are proposed to explain the experimental results, by comparing them with those obtained for other bacterial species such as Proteus mirabilis and Bacillus subtilis.

    DOI: 10.1143/JPSJ.78.074005

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  • Swarming of Pseudomonas aeruginosa PAO1 without differentiation into elongated hyperflagellates on hard agar minimal medium Reviewed

    Chihiro Takahashi, Takashi Nozawa, Taichiro Tanikawa, Yoji Nakagawa, Junichi Wakita, Mitsugu Matsushita, Tohey Matsuyama

    FEMS MICROBIOLOGY LETTERS   280 ( 2 )   169 - 175   2008.3

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:BLACKWELL PUBLISHING  

    Polar flagellated Pseudomonas aeruginosa PAO1 demonstrated extensive spreading growth in 2 days on 1.5% agar medium. Such spreading growth of P. aeruginosa PAO1 strains was absent on Luria-Bertani 1.5% agar medium, but remarkable on Davis minimal synthetic agar medium (especially that containing 0.8% sodium citrate and 1.5% Eiken agar) under aerobic 37 degrees C conditions. Analyses using isogenic mutants and complementation transformants showed that bacterial flagella and rhamnolipid contributed to the surface-spreading behavior. On the other hand, a type IV pilus-deficient pilA mutant did not lose the spreading growth activity. Flagella staining of PAO1 T cells from the frontal edge of a spreading colony showed unipolar and normal-sized rods with one or two flagella. Thus, the polar flagellate P. aeruginosa PAO1 T appears to swarm on high-agar medium by producing biosurfactant rhamnolipid and without differentiation into an elongated peritrichous hyperflagellate.

    DOI: 10.1111/j.1574-6968.2007.01057.x

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  • Periodic growth of bacterial colonies Reviewed

    Y Yamazaki, T Ikeda, H Shimada, F Hiramatsu, N Kobayashi, J Wakita, H Itoh, S Kurosu, M Nakatsuchi, T Matsuyama, M Matsushita

    PHYSICA D-NONLINEAR PHENOMENA   205 ( 1-4 )   136 - 153   2005.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    The formation of concentric ring colonies by bacterial species Bacillus subtilis and Proteus mirabilis has been investigated experimentally, focusing our attention on the dependence of local cell density upon the bacterial motility. It has been confirmed that these concentric ring colonies reflect the periodic change of the bacterial motility between motile cell state and immotile cell state. We conclude that this periodic change is macroscopically determined neither by biological factors (i.e., biological clock) nor by chemical factors (chemotaxis as inhibitor). And our experimental results strongly suggest that the essential factor for the change of the bacterial motility during concentric ring formation is the local cell density. (c) 2005 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physd.2004.12.013

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  • Patterns of Expansion produced by a Structured Cell Population of Serratia marcescens in Response to Different Media Reviewed

    Fumiko Hiramatsu, Jun-Ichi Wakita, Naoki Kobayashi, Yoshihiro Yamazaki, Mitsugu Matsushita, Tohey Matsuyama

    Microbes and Environments   20 ( 2 )   120 - 125   2005

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Japanese Society of Microbial Ecology  

    Characteristic patterns of expansion were generated by bacterial cell populations of Serratia marcescens on media with different concentrations of nutrient and agar. These patterns were classified as Eden-like, dense-branching-morphology-like, flower-like, concentric ring-like and diffusion-limited aggregation-like. Although flower-like was specific to Serratia marcescens, the other patterns were exhibited by Bacillus subtilis. Through macro- and microscopic tracing of the processes generating these patterns, physico-chemical principles of bacterial growth, collaborative and independent properties of bacteria, structural organization for population expansion, and the division of labor among bacterial cells (i.e., wall composer, pressure generator, and logistic supporter) were brought to light. © 2005, Japanese Society of Microbial Ecology &amp
    The Japanese Society of Soil Microbiology. All rights reserved.

    DOI: 10.1264/jsme2.20.120

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  • Dependence of local cell density on concentric ring colony formation by bacterial species Bacillus subtilis Reviewed

    H Shimada, T Ikeda, J Wakita, H Itoh, S Kurosu, F Hiramatsu, M Nakatsuchi, Y Yamazaki, T Matsuyama, M Matsushita

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   73 ( 4 )   1082 - 1089   2004.4

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    The formation of concentric ring-like colonies by bacterial species Bacillus subtilis has been investigated, focusing our attention on the effect of local cell density upon the bacterial motility: (i) Neither any chemicals nor a pacemaker at the center of the ring takes part in the concentric ring formation. (ii) Phase entrainment between two colonies having different phase of concentric ring does not occur. (iii) From the measurement of lag-phase time when varying the initial cell density, the start of the first migration phase is found to depend on the cell density. (iv) When cutting the part of a colony which is behind a migration phase just after the start of migration, the migration phase becomes shorter. On the other hand, the following consolidation phase becomes longer. (v) By the replica-printing method, active bacteria move collectively from inside to outside of the outermost consolidation terrace. Our present experimental results are qualitatively consistent with the results of the other bacterial species P. mirabilis, although the individual cell motility is quite different from each other. The present results suggest that the essential factor of the change of the bacterial motility of B. subtilis during concetric ring formation is the local cell density.

    DOI: 10.1143/JPSJ.73.1082

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  • Dynamical properties of transient spatio-temporal patterns in bacterial colony of Proteus mirabilis Reviewed

    K Watanabe, J Wakita, H Itoh, H Shimada, S Kurosu, T Ikeda, Y Yamazaki, T Matsuyama, M Matsushita

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   71 ( 2 )   650 - 656   2002.2

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    Spatio-temporal patterns emerged inside a colony of bacterial species Proteus mirabilis on the surface of nutrient-rich semisolid agar medium have been investigated. We observed various patterns composed of the following basic types: propagating stripe, propagating stripe with fixed dislocation, expanding and shrinking target, and rotating spiral. The remarkable point is that the pattern changes immediately when we alter the position for observation, but it returns to the original if we restore the observing position within a few minutes. We further investigated mesoscopic and microscopic properties of the spatiotemporal patterns. It turned out that whenever the spatio-temporal patterns are observed in a colony, the areas are composed of two superimposed monolayers of elongated bacterial cells. In each area they are aligned almost parallel with each other like a two-dimensional nematic liquid crystal, and move collectively and independently of another layer. It has been found that the observed spatio-temporal patterns are explained as the moire effect.

    DOI: 10.1143/JPSJ.71.650

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  • Periodic colony formation by bacterial species Bacillus subtilis Reviewed

    J Wakita, H Shimada, H Itoh, T Matsuyama, M Matsushita

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   70 ( 3 )   911 - 919   2001.3

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    We have investigated the periodic colony growth of bacterial species Bacillus subtilis. A colony grows cyclically with the interface repeating an advance (migration phase) and a rest (consolidation phase) alternately on a surface of semi-solid agar plate under appropriate environmental conditions, resulting in a concentric ring-like colony. It was found from macroscopic observations that the characteristic quantities for the periodic growth such as the migration time, the consolidation time and the terrace spacing do not depend so much on nutrient concentration C-n, but do on agar concentration C-a. The consolidation time was a weakly increasing function of C-a, while the migration time and the terrace spacing were, respectively, weakly and strongly decreasing function of C-a. Overall, the cycle (migration-plus-consolidation) time seems to be constant, and does not depend so much on both C-n and C-a. Microscopically, bacterial cells inside the growing front of a colony keep increasing their population during both migration and consolidation phases. It was also confirmed that their secreting surfactant called surfactin does not affect their periodic growth qualitatively, i.e., mutant cells which cannot secrete surfactin produce a concentric ring-like colony. All these results suggest that the diffusion of the nutrient and the surfactin are irrelevant to their periodic growth.

    DOI: 10.1143/JPSJ.70.911

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  • Dynamic aspects of the structured cell population in a swarming colony of Proteus mirabilis Reviewed

    T Matsuyama, Y Takagi, Y Nakagawa, H Itoh, J Wakita, M Matsushita

    JOURNAL OF BACTERIOLOGY   182 ( 2 )   385 - 393   2000.1

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER SOC MICROBIOLOGY  

    Proteus mirabilis forms a concentric-ring colony by undergoing periodic swarming. A colony in the process of such synchronized expansion was examined for its internal population structure. In alternating phases, i.e., swarming (active migration) and consolidation (growth without colony perimeter expansion), phase-specific distribution of cells differing in length, in situ mobility, and migration ability on an agar medium were recognized. In the consolidation phase, the distribution of mobile cells was restricted to the inner part of a new ring and a previous terrace. Cells composing the outer part of the ring were immobile in spite of their ordinary swimming ability in a viscous solution. A sectorial cell population having such an internal structure was replica printed on fresh agar medium. After printing, a transplant which was in the swarming phase continued its ongoing swarming while a transplanted consolidation front continued its scheduled consolidation. This shows that cessation of migration during the consolidation phase was not due to substances present in the underlying agar medium. The ongoing swarming schedule was modifiable by separative cutting of the swarming front or disruption of the ring pattern by random mixing of the pattern-forming cell population. The structured cell population seemed to play a role in characteristic colony growth. However, separation of a narrow consolidation front from a backward area did not induce disturbance in the ongoing swarming schedule. Thus, cells at the frontal part of consolidation area were independent of the internal cell population and destined to exert consolidation and swarming with the ongoing ordinary schedule.

    DOI: 10.1128/JB.182.2.385-393.2000

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  • Periodic colony formation of bacteria due to their cell reproduction and movement Reviewed

    H Itoh, J Wakita, K Watanabe, T Matsuyama, M Matsushita

    PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT   139 ( 139 )   139 - 151   2000

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:PROGRESS THEORETICAL PHYSICS PUBLICATION OFFICE  

    We have experimentally investigated periodic pattern formation produced by bacterial species Proteus mirabilis, which forms concentric-ring-like colonies by repeating migration and rest alternately on the surface of a solid agar medium. We distinguish three phases (initial lag phase, the following migration and consolidation phases that appear alternately) for the colony growth. Here we mainly used physical approaches in order to try to understand the formation of concentric-ring-like colonies, such as cutting the part of a colony during its growth. Global chemical signals governing the colony formation from the center were not found. We also checked phase entrainment quantitatively by letting two colonies collide with each other and confirmed that it does not take place in macroscopic scales. When ive cut a colony just behind the migrating front shortly after the migration started, the migration ended earlier and the following consolidation lasted longer. However, the following cycles were not influenced by the cut, i.e., the following migration and consolidation phases were both found to return normal. The cut results in the stop of supply of cell population to the migrating front by internal waves. In fact the cell population on the new terrace during the first migration after the cut was less than that without cut. Furthermore, the cell population density was found to be recovered to the ordinary value by the end of the consolidation. All these experimental results suggest that the most important factor for the repetition of migration and consolidation phases is the cell population density.

    DOI: 10.1143/PTPS.139.139

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  • Formation of colony patterns by a bacterial cell population Reviewed

    M Matsushita, J Wakita, H Itoh, K Watanabe, T Arai, T Matsuyama, H Sakaguchi, M Mimura

    PHYSICA A   274 ( 1-2 )   190 - 199   1999.12

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    Bacterial species Bacillus subtilis is known to exhibit various colony patterns, such as diffusion-limited aggregation (DLA)-like, compact Eden-like, dense branching morphology (DBM)-like, concentric ring-like and disk-like, depending on the substrate softness and nutrient concentration. We have established the morphological diagram of colony patterns, and examined and characterized both macroscopically and microscopically how they grow. For instance, we have found that there seem to be two kinds of bacterial cells; active and inactive cells, the former of which drive colony interfaces outward, The active cells are particularly distinguished from the inactive ones at the tips of growing branches of a DBM-like colony as the characteristic fingernail structure, We have also found that the concentric ring-like colony is formed as a consequence of alternate repetition of advancing and resting of the growing interface which consists of active cells. Based on our observations, we have constructed a phenomenological but unified model which produces characteristic colony patterns. It is a reaction-diffusion type model for the population density of bacterial cells and the concentration of nutrient. The essential assumption is that there exist: two types of bacterial cells; active cells that move actively, grow and perform cell division, and inactive ones that do nothing at all. Our model is found to be able to reproduce globally all the colony patterns seen in the experimentally obtained morphological diagram, and is phenomenologically quite satisfactory, (C) 1999 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0378-4371(99)00328-3

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  • Periodic pattern formation of bacterial colonies Reviewed

    H Itoh, J Wakita, T Matsuyama, M Matsushita

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   68 ( 4 )   1436 - 1443   1999.4

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    We have experimentally investigated pattern formation of colonies of bacterial species Proteus mirabilis, which is famous for forming concentric-ring-like colonies. The colony grows cyclically with the interface repeating an advance and a stop, alternately on a surface of a solid agar medium. We distinguish three phases (initial lag phase, the following migration and consolidation phases that appear alternately) for the colon!: growth. When we cut a colony just behind a migrating front shortly after the migration started, the migration ended earlier and the following consolidation lasted longer. However, the following cycles were not influenced by the cut, i.e., the phases of the migration and consolidation were not affected. Global chemical signals governing the colony formation from the center were not found to exist. We also quantitatively checked phase entertainment Ly letting two colonies collide with each other and found trial it does not take place in macroscopic scales. All these experimental results suggest that the most important factor for the migration is the cell population density.

    DOI: 10.1143/JPSJ.68.1436

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  • Experimental investigation on the formation of dense-branching-morphology-like colonies in bacteria Reviewed

    J Wakita, Rafols, I, H Itoh, T Matsuyama, M Matsushita

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   67 ( 10 )   3630 - 3636   1998.10

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    We have investigated experimentally the pattern formation of bacterial colonies. We have especially examined DBM (dense-branching-morphology)-like colonies of bacterial species Bacillus subtilis. It was found from microscopic observations that many active bacterial cells collect and make a group on the tip of each growing branch. Branches repel each other and split sometimes as they sow outward. It was confirmed macroscopically that both averaged branch width [width] and averaged branch gap [gap] decrease systematically when increasing the nutrient concentration C-n, while their ratio remains unchanged with the approximate value of one. It was also found that the distribution of branch lengths is very close to exponential, suggesting that the tip-splitting of branches takes place at random.

    DOI: 10.1143/jpsj.67.3630

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  • Formation of Dense-Branching-Morphology-like Colonies in Bacteria

    J. Wakita, I. Rafols, H. Itoh, T. Matsuyama, M. Matsushita

    STATPHYS20 Book of Abstracts, A. GERVOIS, M. GINGOLD and D. IAGOLNITZER eds. (1998)   21 - 21   1998.7

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  • Interface growth and pattern formation in bacterial colonies Reviewed

    M Matsushita, J Wakita, H Itoh, Rafols, I, T Matsuyama, H Sakaguchi, M Mimura

    PHYSICA A   249 ( 1-4 )   517 - 524   1998.2

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    Bacterial species Bacillus subtilis is known to exhibit various colony patterns, depending on the substrate softness and nutrient concentration. We have examined the self-affinity and roughness exponent a for growing interfaces of colonies which belong to regions B (Eden-like) and D (disk-like) in the morphological phase diagram of this species. We have obtained alpha similar or equal to 0.78 and 0.50 in the regions B and D, respectively, and found that the difference of alpha values can be attributed to that of microscopic growth mechanisms of colony interfaces. We have also proposed a unified model which produces characteristic colony patterns observed in our experiments. It is a diffusion-reaction-type model for the population density of bacterial cells and the concentration of nutrient. The essential assumption is that there exist two types of bacterial cells; active and inactive. Our model is found to be able to globally reproduce all the colony patterns in the phase diagram. (C) 1998 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0378-4371(97)00511-6

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  • Pattern Formation in Bacterial Colonies and Its Modelling

    M. Matsushita, J. Wakita, H. Itoh, I. Rafols, T. Matsuyamah, H. Sakaguchi, M. Mimura

    STATISTICAL PHYSICS Experiments, Theories, and Computer Simulations, M. Tokuyama and I. Oppenheim eds.   135 - 138   1998

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  • Experimental Study of Concentric Ring Patterns in Bacterial Colonies

    I. Rafols, J. Wakita, H. Itoh, T. Matsuyama, M. Matsushita

    STATISTICAL PHYSICS Experiments, Theories, and Computer Simulations, M. Tokuyama and I. Oppenheim eds.   146 - 146   1998

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  • Self-affinity for the growing interface of bacterial colonies Reviewed

    J Wakita, H Itoh, T Matsuyama, M Matsushita

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   66 ( 1 )   67 - 72   1997.1

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    We have investigated experimentally the self-affinity of bacterial colonies. We examined roughness exponent alpha for one-dimensional growing interfaces of colonies which belong to regions B and D in the morphological phase diagram of bacterial species Bacillus subtilis. Although macroscopically compact colony patterns are obtained in both B and D regions, microscopic growth mechanisms of their colony interfaces are quite different from each other. In the region B where the colony interface consists of many chains of bacterial cells that lie almost side by side and advances with clear long-range lateral correlations, we obtained alpha similar or equal to 0.78 +/- 0.02. In the region D, however, where the interface is made of individual cells and advances rather locally through random pushes due to active movement of individual cells inside the colony, the value of alpha similar or equal to 0.50 +/- 0.01 was obtained. The difference of values of the exponent alpha was thus found to be clearly attributed to that of microscopic growth mechanisms of colony interfaces.

    DOI: 10.1143/JPSJ.66.67

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  • Morphological diversity of the colony produced by bacteria Proteus mirabilis Reviewed

    A Nakahara, Y Shimada, J Wakita, M Matsushita, T Matsuyama

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   65 ( 8 )   2700 - 2706   1996.8

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    Morphological changes of colonies have been investigated for a bacterial strain of Proteus mirabilis, which is a famous species for producing concentric-ring-like colonies. It was found that colony patterns can be classified into three types, i.e., cyclic spreading, diffusion-limited growth (DLA-like) and three-dimensional growth (inside the agar medium) patterns. Cyclic spreading patterns can further be classified into three subgroups, i.e., concentric-ring, homogeneous and spatiotemporal patterns. These subgroups were classified by examining the development of colony structure after colonies spread all over petri-dishes. Comparison of the results with those of another bacterial species Bacillus subtilis is also discussed.

    DOI: 10.1143/JPSJ.65.2700

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  • Growth and morphological changes of bacteria colonies

    M Matsushita, J Wakita, T Matsuyama

    SPATIO-TEMPORAL PATTERNS IN NONEQUILIBRIUM COMPLEX SYSTEMS   21   609 - 618   1995

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  • Growth Dynamics of Bacterial Colonies and Their Morphological Change

    M. Matsushita, J. Wakita, K. Komatsu, A. Nakahara, T. Matsuyama

    Dynamical Systems and Chaos, vol.2(Physics), Y. Aizawa, S. Saito and K. Shiraiwa eds.   151 - 160   1995

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  • PATTERN-FORMATION BY REPRODUCIBLE RANDOM WALKERS IN IRREVERSIBLY EXPANDABLE ENCLOSURE Reviewed

    K KOMATSU, J WAKITA, A NAKAHARA, M MATSUSHITA

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   63 ( 9 )   3230 - 3233   1994.9

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    Based on microscopic observations, a reproducible random-walker model is presented to simulate the growth of a bacterial colony. Random walkers expand their territory by pushing the wall surrounding their colony. Numerical studies revealed that the model can explain our experimental results obtained using the bacteria species Bacillus subtilis.

    DOI: 10.1143/JPSJ.63.3230

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  • EXPERIMENTAL INVESTIGATION ON THE VALIDITY OF POPULATION-DYNAMICS APPROACH TO BACTERIAL COLONY FORMATION Reviewed

    J WAKITA, K KOMATSU, A NAKAHARA, T MATSUYAMA, M MATSUSHITA

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   63 ( 3 )   1205 - 1211   1994.3

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    We have investigated the dynamics of a two-dimensional spreading of a bacterial population in a surface environment. After point inoculation of flagellated bacteria (Bacillus subtilis) on nutrient-rich semi-solid medium, the bacterial population grew up by multiplication and translocation of cells, and developed a homogeneous round colony. By comparing experimental results with those of numerical simulations of the model equation, we found that this homogeneous population growth of bacteria is an actual manifestation of growth dynamics described by the Fisher's equation.

    DOI: 10.1143/JPSJ.63.1205

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MISC

  • 18aM1-7 Cell cell Interaction of Collective Motion by Bacillus subtilis in a circular pool

    Yoshinaga Kase, Jun-ichi Wakita

    Meeting abstracts of the Physical Society of Japan   2024.3

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  • 19pCW-8 Phase diagram of collective motions for bacterial cells in a shallow circular pool

    Jun-ichi Wakita, Shota Tsukamoto, Ken Yamamoto, Makoto Katori

    Meeting abstracts of the Physical Society of Japan   70   2867 - 2867   2015.8

  • 19pCW-7 Analysis of initial growth process of bacteria by nonlinear systems of differential equations

    Ryojiro Honda, Jun-ichi Wakita, Makoto Katori

    Meeting abstracts of the Physical Society of Japan   70   2866 - 2866   2015.8

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  • 22aAJ-8 Growing string-like patterns of bacteria

    Ryojiro Honda, Jun-ichi Wakita, Makoto Katori

    Meeting abstracts of the Physical Society of Japan   70   2956 - 2956   2015.3

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  • 10aAR-4 Collective motion of bacterial cells in a two-dimensional circular pool

    Tsukamoto Shota, Yamamoto Ken, Katori Makoto, Wakita Jun-ichi

    Meeting abstracts of the Physical Society of Japan   69 ( 2 )   226 - 226   2014.8

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  • Colony Formation by Elongated Bacteria Bacillus subtilis

    Wakita Jun-ichi, Yamamoto Ken, Matsushita Mitsugu

    Meeting abstracts of the Physical Society of Japan   68 ( 2 )   243 - 243   2013.8

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  • 26aXR-8 TASEP on a circle and observations of circular motions of bacteria

    Yamada Yasuyuki, Katori Makoto, Wakita Jun-ichi

    Meeting abstracts of the Physical Society of Japan   68 ( 1 )   322 - 322   2013.3

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  • 29aXM-10 Growth Mechanism of Concentric-ring Pattern for B. subtilis Colony

    Kumata Ryuto, Arima Mina, Wakita Jun-ichi, Matsuyama Tohey, Matsushita Mitsugu

    Meeting abstracts of the Physical Society of Japan   68 ( 1 )   400 - 400   2013.3

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  • 28pXZD-11 Spatio-temporal pattern in bacterial colony and Moire illusion

    Kobayashi Naoki, Wakita Jun-ichi, Moriyama Osamu, Yamazaki Yoshihiro, Sugihara Kokichi, Matsushita Mitsugu

    Meeting abstracts of the Physical Society of Japan   68 ( 1 )   443 - 443   2013.3

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  • 29aXM-9 Distributions of Branch Width and Gap for Bacillus subtilis DBM Colonies

    Wakita Jun-ichi, Yamamoto Ken, Kobayashi Naoki, Matsuyama Tohey, Matsushita Mitsugu

    Meeting abstracts of the Physical Society of Japan   68 ( 1 )   400 - 400   2013.3

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  • 29aXM-11 Concentric-ring Colonies of Bacterial Species Pseudomonas aeruginosa

    Arima Mina, Kumata Ryuto, Wakita Jun-ichi, Matsuyama Tohey, Matushita Mitsugu

    Meeting abstracts of the Physical Society of Japan   68 ( 1 )   400 - 400   2013.3

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  • 26pAC-6 Characteristics of Statistical Distributions of Height and Weight

    Sato Yuta, Wakita Jun-ichi, Matsushita Mitsugu

    Meeting abstracts of the Physical Society of Japan   67 ( 1 )   344 - 344   2012.3

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  • 26pAC-10 Branch Width Distribution of Dense-Branching-Morphology Colonies by Bacillus subtilis (3)

    Wakita Jun-ichi, Arima Mina, Kumata Ryuto, Kobayashi Naoki, Matsuyama Tohey, Matsushita Mitsugu

    Meeting abstracts of the Physical Society of Japan   67 ( 1 )   345 - 345   2012.3

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  • 26pAC-5 Percolation analysis of the Cosmic Microwave Background radiation

    Higuchi M., Kobayashi N., Wakita J., Yamazaki Y., Kuninaka H., Katori M., Matsushita M., Matsushita S., Chiang Lung-Yih

    Meeting abstracts of the Physical Society of Japan   67 ( 1 )   344 - 344   2012.3

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  • 26pAC-9 Pattern Formation of Bacterial Colonies by Pseudomonas aeruginosa

    Arima Mina, Kumata Ryuto, Wakita Jun-ichi, Matsuyama Tohey, Matsushita Mitsugu

    Meeting abstracts of the Physical Society of Japan   67 ( 1 )   345 - 345   2012.3

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  • 26pAC-8 Concentric-ring-like Colony of B. subtilis

    Kumata Ryuto, Arima Mina, Wakita Jun-ichi, Matsuyama Tohei, Matsushita Mitsugu

    Meeting abstracts of the Physical Society of Japan   67 ( 1 )   344 - 344   2012.3

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  • 20pED-10 Size Distribution of Bacterial Cells in Homogeneously Spreading Disk-like Colonies by B.subtilis

    Meeting abstracts of the Physical Society of Japan   65 ( 1 )   373 - 373   2010.3

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  • 26pQE-3 Size Distribution of Bacterial Cells in Homogeneously Spreading Disk-like Colonies by B. subtilis

    Meeting abstracts of the Physical Society of Japan   64 ( 2 )   260 - 260   2009.8

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  • 30pVC-4 Pattern Formation of Colonies by Pseudomonas aeruginosa

    Koyano M., Wakita J., Matsuyama T., Matsushita M.

    Meeting abstracts of the Physical Society of Japan   64 ( 1 )   398 - 398   2009.3

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  • 21pTP-7 B.subtilisディスク状コロニーの微視的観察(21pTP 生物・生態系(社会・言語・ゲーム等含む)2,領域11,統計力学,物性基礎論,応用数学,力学,流体物理)

    脇田 順一, 松山 東平, 松下 貢

    日本物理学会講演概要集   62 ( 2 )   267 - 267   2007.8

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  • Spatiotemporal patterns produced by bacterial species Proteus mirabilis

    Watanabe K., Wakita J., Itoh H., Matsuyama T., Matsushita M.

    Meeting abstracts of the Physical Society of Japan   56 ( 1 )   271 - 271   2001.3

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  • Spatiotemporal Patterns Produced by Bacterial Species Proteus mirabilis (Mathematical Aspects of Complex Fluids II)

    Watanabe Kazuhiko, Wakita Jun-ichi, Itoh Hiroto, Matsuyama Tohey, Matsushita Mitsugu

    RIMS Kokyuroku   1184   89 - 105   2001.1

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    Other Link: http://hdl.handle.net/2433/64611

  • Replica Printing for Concentric Ring-like Colonies of Bacillus subtilis (Mathematical Aspects of Complex Fluids II)

    Shimada Hirotoshi, Wakita Jun-ichi, Itoh Hiroto, Watanabe Kazuhiko, Matsuyama Tohey, Matsushita Mitsugu

    RIMS Kokyuroku   1184   106 - 122   2001.1

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  • Periodic Pattern Formation of Bacterial Colonies II

    ITOH H., WAKITA J., MATSUYAMA T., MATSUSHITA M.

    Meeting abstracts of the Physical Society of Japan   53 ( 2 )   760 - 760   1998.9

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  • Pattern Formation of DBM-like Bacterial Colonies

    WAKITA J., ISMAEL Rafols, ITOH H., MATSUYAMA T., MATSUSHITA M.

    Meeting abstracts of the Physical Society of Japan   53 ( 1 )   683 - 683   1998.3

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  • Periodic Pattern Formation of Bacterial Colonies

    ITOH H., ISMAEL Rafols, WAKITA J., MATSUSHITA M., MATSUYAMA T.

    Meeting abstracts of the Physical Society of Japan   53 ( 1 )   683 - 683   1998.3

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  • 30p-WE-14 The Formation of DBM and Ring Patterns in Bacterial Colonies

    Wakita J., Rafols Ismael, Itoh H., Matsuyama T., Matsushita M.

    Meeting abstracts of the Physical Society of Japan   52 ( 1 )   728 - 728   1997.3

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  • 27a-YE-2 Ring and Spatiotemporal Patterns Produced by Bacteria P.mirabilis

    Nakahara Akio, Shimada Yuji, Moriyama Osamu, Wakita Jun-ichi, Matsushita Mitsugu, Matsuyama Tohey

    Abstracts of the meeting of the Physical Society of Japan. Sectional meeting   1995 ( 4 )   71 - 71   1995.9

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  • Pattern Formation of Bacterial Growth(effect of surfactant)

    Wakita J, Itoh H, Nakahara A, Matsushita M, Matsuyama T

    Abstracts of the meeting of the Physical Society of Japan. Annual meeting   50 ( 3 )   573 - 573   1995.3

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  • 28a-C-4 Pattern Formation of Bacterial Growth

    Komatsu K, Wakita J, Nakahara A, Matsushita M, Matsuyama T

    Abstracts of the meeting of the Physical Society of Japan. Annual meeting   49 ( 3 )   494 - 494   1994.3

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  • バクテリア増殖によるパターン形成(「非平衡系の統計物理」研究会(その1),研究会報告)

    松下 貢, 脇田 順一, 松山 東平

    物性研究   59 ( 1 )   76 - 79   1992

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    Other Link: http://hdl.handle.net/2433/94965

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Presentations

  • Cell cell Interaction of Collective Motion by Bacillus subtilis in a circular pool

    Yoshinaga Kase, Jun-ichi Wakita

    The Physical Society of Japan 2023 Spring Meeting  ( Online Meeting )   2024.3  The Physical Society of Japan

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  • Synchronization Phenomenon Found in Collective Motion of Bacillus subtilis Cells in a Circular Pool

    Ryo Akutsu, Jun-ichi Wakita

    The Physical Society of Japan 2023 Spring Meeting  ( Online Meeting )   2023.3  The Physical Society of Japan

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  • Formation Mechanism of Periodic Tip-splitting Pattern in Crystal Growth of Sodium Chloride

    Fumiya Asai, Jun-ichi Wakita

    The Physical Society of Japan 2023 Spring Meeting  ( Online Meeting )   2023.3  The Physical Society of Japan

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  • Origin of Metastate-like Behavior of Bacterial Colonies

    Jun-ichi Wakita

    The Physical Society of Japan 2022 Autumn Meeting  ( Tokyo Institute of Technology )   2022.9  The Physical Society of Japan

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    寒天平板上で成長するB. subtilisコロニーは、寒天濃度と栄養濃度を環境パラメータとして、5種類のコロニー・パターンに分類できる。これらパターンの形成機構とパターン間の遷移の仕組みについて、菌単体レベルにおける相互作用との関係から議論する。

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  • DBM growth of Bacillus subtilis colonies on agar plate surface coated with surfactant

    Shun Kobayashi, Jun-ichi Wakita

    The Physical Society of Japan 77th Annual Meeting  ( Online Meeting )   2022.3  The Physical Society of Japan

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    枯草菌がコロニー形成時に分泌するサーファクタントをあらかじめ培地表面に添加したときにコロニーが時計回りの螺旋成長を示すことを確認した。コロニー先端部の光学顕微鏡観察を行った結果、サーファクタントを塗り拡げていない培地上ではコロニー成長界面に対して棒状の菌が平行に並ぶ傾向がみられたのに対して、サーファクタントを塗り拡げた培地上ではコロニー成長界面に対して棒状の菌が斜めに配列する傾向がみられた。コロニー成長界面におけるこれらの菌の配列の違いがコロニーの成長の違いを引き起こしていることが分かった。

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  • Statistical properties of the number of COVID19 cases

    Kenta Takizawa, Jun-ichi Wakita

    日本物理学会 2021年秋季大会  ( オンライン )   2021.9  日本物理学会

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    本研究では、世界各国のCOVID19感染者数データに着目し,統計物理学的な立場より解析を行った。その結果、累積感染者数分布は概ね対数正規分布に従うが、2020年11月頃より分布の裾野がべき分布的に振る舞うことが確認された。その原因として、分布の裾野の国の感染率分布において、これ以上大きくならない閾値(最大値)が存在することが示唆された。

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  • Block area distribution of the metropolitan area in Japan

    Yuto Chiaki, Jun-ichi Wakita

    日本物理学会 2021年秋季大会  ( オンライン )   2021.9  日本物理学会

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    道路に囲まれた土地の面積分布はドイツの主要20都市についてべき乗分布に従うことが報告されている。一方、日本では東京23区について江戸時代と明治時代について、対数正規分布に従うことが報告されている。本研究では、東京浅草を起点とし、周辺にかけて面積分布がどのように変化していくかを調べた。その結果、東京浅草の分布は面積の小さい領域では対数正規的に、面積の大きい裾野の領域ではべき的に振る舞いうことを確認した。そして、周辺にいくにしたがって、分布は全体的に対数正規分布に従うようになっていることを確認した。

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  • Fragmentation Mechanism of Long Thin Glass Rods

    Riku Shirao, Takuma Narizuka, Jun-ichi Wakita

    日本物理学会 第75回年次大会  ( 名古屋大学東山キャンパス )   2020.3  日本物理学会

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    ガラス棒の破壊における破片質量分布は落下高さにより変化することが知られている。今回は落下を繰り返すことによる分布の変化について調べた。

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  • Mechanism of a dynamical transition in collective motions of Bacillus subtilis cells

    Jun-ichi Wakita, Ryojiro Honda, Sora Umeda, Takuma Narizuka

    日本物理学会 2019年秋季大会  ( 岐阜大学柳戸キャンパス )   2019.9  日本物理学会

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  • Cell-cell and Cell-noise Interactions of Bacterial Cells in a Shallow Circular Pool and Transitions of Collective Motions International conference

    Jun-ichi Wakita

    International Conference on Statistical Physics "StatPhys27"  ( Buenos Aires, Argentina )   2019.7  Local Organizing Committee, IUPAP C3 Commission

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  • Dynamic transition of collective motion of bacterial cells in a circular pool

    Sora Umeda, Ryojiro Honda, Takuma Narizuka, Jun-ichi Wakita

    日本物理学会 第74回年次大会  ( 九州大学伊都キャンパス )   2019.3  日本物理学会

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    棒状の菌B. subtilisは寒天培地上に作成した円形プール内において様々な振る舞いを示す。その振る舞いはプールの直径に対する菌体長の比λとプール内の菌密度ρに依存するとされており、特にλについては二つの閾値の存在が定性的に確認されている。今回その内の大きい方の閾値について、トラッキングとPIVを用い、菌単体と集団における周方向秩序パラメータを定義した。その結果秩序パラメータの急激な変化が確認された。

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  • Aspect Ratio Distribution of Fragments in Glass Rod Fragmentation

    Riku Shirao, Takuma Narizuka, Jun-ichi Wakita

    日本物理学会 第74回年次大会  ( 九州大学伊都キャンパス )   2019.3  日本物理学会

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  • Ordering Mechanism of Collective Motion of Bacterial cells in a Shallow Circular Pool International conference

    R. Honda, J. Wakita

    International Conference on APEF2018  ( Ito International Research Center, the University of Tokyo )   2018.11  APEF2018 Conference Organizing Committee

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  • Dynamical Phase Transitions of Collective Motion of Bacterial Cells in a Shallow Circular Pool International conference

    J. WAkita, R. Honda

    International Conference on APEF2018  ( Ito International Research Center, the University of Tokyo )   2018.11  APEF2018 Conference Organizing Committee

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  • Spiral growth of DBM colonies by Bacillus subtilis

    Mizuho Nishioka, Takuma Naritsuka, Jun-ichi Wakita

    日本物理学会 2018年秋季大会  ( 同志社大学京田辺キャンパス )   2018.9  日本物理学会

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  • Velocity field analysis of collective motion of bacterial cells at low cell density in a shallow circular pool

    Ryojiro Honda, Jun-ichi Wakita

    日本物理学会 第73回年次大会  ( 東京理科大学野田キャンパス )   2018.3  日本物理学会

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  • Motion analysis of bacterial cells in a shallow circular pool

    Ryojiro Honda, Jun-ichi Wakita

    日本物理学会 2017年秋季大会  ( 岩手大学上田キャンパス )   2017.9  日本物理学会

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  • Time series analysis of collective motion of bacterial cells in a shallow circular pool

    Jun-ichi Wakita, Ryojiro Honda, Takuma Narizuka

    日本物理学会 2017年秋季大会  ( 岩手大学上田キャンパス )   2017.9  日本物理学会

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  • Motion analysis of a single bacteria with different reduced cell length in a shallow circular pool

    Ryojiro Honda, Jun-ich Wakita

    日本物理学会 第71回年次大会  ( 大阪大学豊中キャンパス )   2017.3  日本物理学会

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  • Velocity field analysis of collectively moving bacteria in a shallow circular pool

    Shohei Harada, Ryojiro Honda, Ken Yamamoto, Jun-ichi Wakita

    日本物理学会 第72回年次大会  ( 大阪大学豊中キャンパス )   2017.3  日本物理学会

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  • Diameter dependence of fragment-mass distributions of long thin glass rods

    Shinsuke Ono, Ken Yamamoto, Jun-ichi Wakita

    日本物理学会 第72回年会  ( 大阪大学豊中キャンパス )   2017.3  日本物理学会

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  • Analysis of a phenomenological model of bacterial growth and lognormal behavior of the cell-size distribution

    Ken Yamamoto, Jun-ichi Wakita

    日本物理学会 2016年秋季大会  ( 金沢大学角間キャンパス )   2016.9  日本物理学会

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  • Periodic tip-splitting growth of NaCl crystal on agar plate surface

    Jun-ichi Wakita, Keisuke Imai, Ken Yamamoto, Yoshihiro Yamazaki

    日本物理学会 2016年秋季大会  ( 金沢大学角間キャンパス )   2016.9  日本物理学会

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  • Self-Elongation with Sequential Folding of a Filament of Bacterial Cells International conference

    Ryojiro Honda, Jun-ichi Wakita, Makoto KAtori

    STATPHYS26  ( 18-22 Jul, Centre de Congrès de Lyon, France )   2016.7 

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  • Phase Diagram of Collective Motion of Bacterial Cells International conference

    Jun-ichi Wakita, Ken Yamamoto, Ryojiro Honda, Makoto Katori

    STATPHYS26  ( 18-22 Jul, Centre de Congrès de Lyon, France )   2016.7 

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  • Size distribution of Escherichia coli cells in concentric ring-like colonies

    Hikaru Takeuchi, Ken Yamamoto, Jun-ichi Wakita

    日本物理学会 第71回年次大会  ( 東北学院大学泉キャンパス )   2016.3  日本物理学会

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  • バクテリアの紐状成長における複雑な折り畳み過程の定量化 Invited

    Jun-ichi Wakita, Ryojiro Honda, Makoto Katori

    日本物理学会 第71回年次大会 フレンドシップ・ミーティング  ( 東北学院大学泉キャンパス )   2016.3  日本物理学会

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  • Morphology Diagram of Dendritic Crystal Growth for Sodium Chloride on Agar Plate

    Keisuke Imai, Ken Yamamoto, Jun-ichi Wakita

    日本物理学会 2015年秋季大会  ( 関西大学千里山キャンパス )   2015.9  日本物理学会

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  • Analysis of initial growth process of bacteria by nonlinear systems of differential equations

    Ryojiro Honda, Jun-ichi Wakita, Makoto katori

    日本物理学会 2015年秋季大会  ( 関西大学千里山キャンパス )   2015.9  日本物理学会

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  • Phase diagram of collective motions for bacterial cells in a shallow circular pool

    Jun-ichi Wakita, Shota Tsukamoto, Ken Yamamoto, Makoto Katori

    日本物理学会 2015年秋季大会  ( 関西大学千里山キャンパス )   2015.9  日本物理学会

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  • Crystal growth of sodium chloride on agar plates

    Keisuke Imai, Ken Yamamoto, Jun-chi Wakita

    日本物理学会 第70回年次大会  ( 早稲田大学早稲田キャンパス )   2015.3  日本物理学会

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  • Pattern of Self-Elongating Bacteria

    Ryojiro Honda, Jun-chi Wakita, Makoto Katori

    日本物理学会 第70回年次大会  ( 早稲田大学早稲田キャンパス )   2015.3  日本物理学会

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  • Collective behavior of bacterial cells in a two-dimensional circular pool International conference

    Jun-ichi Wakita, Shota Tsukamoto, Ken Yamamoto, Makoto Katori

    International Conference on Mathematical Modeling and Applications - Crowd Dynamics  ( 明治大学中野キャンパス )   2015.1 

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  • Collective behavior of bacterial cells in interfacial environment Invited

    Jun-ichi Wakita

    Workshop 'Fluctuation and Correlation in Stochastic Systems'  ( 中央大学後楽園キャンパス )   2014.10 

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  • Collective Motion of Bacterial Cells in a Two-dimensional Circular Pool

    Shota Tsukamoto, Ken Yamamoto, Makoto Katori, Jun-ichi Wakita

    日本物理学会 2014年秋季大会  ( 中部大学春日井キャンパス )   2014.9  日本物理学会

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  • セラチア菌コロニーの周期的成長機構

    Hiroki Ishizuka, Ken Yamamoto, Junichi Wakita

    日本物理学会 第69回年次大会  ( 東海大学湘南キャンパス )   2014.3  日本物理学会

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  • 大腸菌コロニーの周期的成長パターンに潜むサイズ分布

    Shinya Sugiyama, Ken Yamamoto, Jun-ichi Wakita

    日本物理学会 第69回年次大会  ( 東海大学湘南キャンパス )   2014.3  日本物理学会

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  • NaCl結晶のモルフォロジーダイアグラム及び先端振動成長

    Hiroki Hasei, Ken Yamamot, Junichi Wakita

    日本物理学会 第69回年次大会  ( 東海大学湘南キャンパス )   2014.3  日本物理学会

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  • Colony Formation by Elongated Bacteria Bacillus subtilis

    Jun-chi Wakita, Ken Yamamoto, Mitsugu Matsushita

    日本物理学会 2013年秋季大会  ( 徳島大学常三島キャンパス )   2013.9  日本物理学会

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  • 円周上のTASEPとバクテリアの円運動観察

    Hiroyuki Yamada, Makoto Katori, Junichi Wakita

    日本物理学会 第68回年次大会  ( 広島大学東広島キャンパス )   2013.3  日本物理学会

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  • バクテリアの時空パターンとモアレ錯視

    Naoki Kobayashi, Jun-ichi Wakita, Osamu Moriyama, Yoshihiro Yamazaki, Koukichi Sugihara, Mitsugu Matsushita

    日本物理学会 第68回年次大会  ( 広島大学東広島キャンパス )   2013.3  日本物理学会

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  • 枯草菌DBMコロニーの枝幅・枝間隔分布

    Jun-ichi Wakita, Ken Yamamoto, Naoki Kobayashi, Tohei Matsuyama, Mitsugu Matsushita

    日本物理学会 第68回年次大会  ( 広島大学東広島キャンパス )   2013.3  日本物理学会

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  • B. subtilisコロニーの同心円状リングパターン成長機構

    Ryuto Kumata, Mina Arima, Jun-ichi wakita, Tohei Matsuyama, Mitsugu Matsushita

    日本物理学会 第68回年次大会  ( 広島大学東広島キャンパス )   2013.3  日本物理学会

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  • 緑膿菌コロニーの周期的成長パターン

    Mina Arima, Ryuto Kumata, Jun-ichi Wakita, Tohei Matsuyama, Mitsugu Matsushita

    日本物理学会 第68回年次大会  ( 広島大学東広島キャンパス )   2013.3  日本物理学会

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  • 薄膜状になったアスコルビン酸溶液の流動性と周期的結晶成長

    Yoshihiro Yamazaki, Akihiko Toda, Jun-ichi Wakita, Mitsunobu Kikuchi, Shuya Ishii, Mistugu Matsushita

    日本物理学会 第68回年次大会  ( 広島大学東広島キャンパス )   2013.3  日本物理学会

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  • 宇宙マイクロ波背景放射のパーコレーション解析

    Masaya Higuchi, Naoki Kobayashi, Jun-ichi Wakita, Yoshihiro Yamazaki, HIroto Kuninaka, Makoto Katori, Mitsugu Matsushita, Satoki Matsushita, Lung-Yih Chiang

    日本物理学会 第67回年次大会  ( 関西学院大学西宮上ヶ原キャンパス )   2012.3  日本物理学会

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  • 身長と体重に見られる統計分布の特性

    Yuta Satoh, Jun-ichi Wakita, Mitsugu Matsushita

    日本物理学会 第67回年次大会  ( 関西学院大学西宮上ヶ原キャンパス )   2012.3  日本物理学会

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  • B. subtilisの同心円状リングパターン

    Ryuto Kumata, Mina Arima, Jun-ichi Wakita, Tohei Matsuyama, Mitsugu Matsushita

    日本物理学会 第67回年次大会  ( 関西学院大学西宮上ヶ原キャンパス )   2012.3  日本物理学会

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  • 緑膿菌コロニーのパターン形成

    Mina Arima, Ryuto Kumata, Jun-ichi Wakita, Tohei Matsuyama, Mitsugu Matsushita

    日本物理学会 第67回年次大会  ( 関西学院大学西宮上ヶ原キャンパス )   2012.3  日本物理学会

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  • 枯草菌DBMコロニーの枝幅分布(3)

    Jun-ichi Wakita, Mina Arima, Ryuto Kumata, Naoki Kobayashi, Tohei Matsuyama, Mitsugu Matsushita

    日本物理学会 第67回年次大会  ( 関西学院大学西宮上ヶ原キャンパス )   2012.3  日本物理学会

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  • 枯草菌DBMコロニーの枝幅分布(2)

    Jun-ichi Wakita, Naoki Kobayashi, Tohei Matsuyama, Mitsugu Matsushita

    日本物理学会 2011年秋季大会  ( 富山大学五福キャンパス )   2011.9  日本物理学会

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  • 緑膿菌コロニーの周期的成長パターン

    Yurie Yanagawa, Jun-ichi Wakita, Tohei Matsuyama, Mitsugu Matsushita

    日本物理学会 第66回年次大会  ( 新潟大学五十嵐キャンパス )   2011.3  日本物理学会

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  • 枯草菌DBMコロニーの枝幅分布

    Jun-ichi Wakita, Yurie Yanagawa, Naoki Kobayashi, Tohei Matsuyama, Mitsugu Matsushita

    日本物理学会 第66回年次大会  ( 新潟大学五十嵐キャンパス )   2011.3  日本物理学会

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  • Bacillus subtilisコロニーにみられるサイズ分布

    Jun-ichi Wakita, Yurie Yanagawa, Tohei Matsuyama, Mitsugu Matsushita

    基研研究会2010 非平衡系の物理-非平衡ゆらぎと集団挙動(11/18-20)  ( 湯川記念館パナソニックホール )   2010.11 

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  • Pattern Formation of Bacterial Colonies Invited

    Jun-ichi Wakita

    日本生物物理学会 第48回年会  ( 東北大学仙台キャンパス )   2010.9  日本生物物理学会

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  • 大腸菌コロニーの形態形成における走化性の影響

    Sachie Ebara, Tetsuo Yoshino, Sachihiko Tonomura, Rie Tokita, Takaki Katoh, Maeda Yusuke, Jun-chi Wakita, Tohei Matsuyama, Masaki Sano, Mitsugu Matsushita

    日本物理学会 第65回年次大会  ( 岡山大学津島キャンパス )   2010.3  日本物理学会

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  • P. mirabilisの同心円状パターン(2)

    Sachihiko Tonomura, Sachie Ebara, Tetsuo Yoshino, Jun-chi Wakita, Tohei Matsuyama, Mitsugu Matsushita

    日本物理学会 第65回年次大会  ( 岡山大学津島キャンパス )   2010.3  日本物理学会

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  • 大腸菌コロニーの周期的成長パターン(2)

    Tetsuo Yoshino, Sachie Ebara, Sachihiko Tonomura, Rie Tokita, Takaki Katoh, Jun-chi Wakita, Yusuke Maeda, Masaki Sano, Tohei Matsuyama, Mitsugu Matsushita

    日本物理学会 第65回年次大会  ( 岡山大学津島キャンパス )   2010.3  日本物理学会

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  • 枯草菌のサイズ分布(3)

    Jun-ichi Wakita, Hiroto Kuninaka, Tohei Matsuyama, Mitsugu Matsushita

    日本物理学会 第65回年次大会  ( 岡山大学津島キャンパス )   2010.3  日本物理学会

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  • Size Distribution of Bacterial Cells in Homogeneously Spreading Disk-like Colonies by B. subtilis International conference

    J. Wakita, T. Matsuyama, M. Matsushita

    the 9th Asia-Pacific Complex Systems Conference (4-7 Nov)  ( Tokyo, Japan )   2009.11 

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  • Concentric-ring-like Colony of P. mirabilis International conference

    S. Tonomura, S. Ebara, T. Yoshino, J. Wakita, T. Matsuyama, M. Matsushita

    the 9th Asia-Pacific Complex Systems Conference (4-7 Nov)  ( Tokyo, Japan )   2009.11 

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  • Concentric-ring pattern formation of bacterial colonies of Escherichia coli International conference

    T. Yoshino, S. Ebara, S. Tonomura, R. Tokita, T. Katoh, Y. Maeda, J. Wakita, M. Sano, T. Matsuyama, M. Matsushita

    the 9th Asia-Pacific Complex Systems Conference (4-7 Nov)  ( Tokyo, Japan )   2009.11 

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  • Pattern Formation of Bacterial Colonies by Escherichia coli International conference

    S. Ebara, T. Yoshino, S. Tonomura, R. Tokita, T. Kato, Y. Maeda, J. Wakita, M. Sano, T. Matsuyama, M. Matsushita

    the 9th Asia-Pacific Complex Systems Conference (4-7 Nov)  ( Tokyo, Japan )   2009.11 

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  • 大腸菌コロニーの形態形成

    Sachie Ebara, Tetsuo Yoshino, Sachihiko Tonomura, Rie Tokita, Takaki Katoh, Yusuke Maeda, Jun-chi Wakita, Tohei Matsuyama, Masaki Sano, Mitsugu Matsushita

    日本物理学会 2009年秋季大会  ( 熊本大学黒髪キャンパス )   2009.9  日本物理学会

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  • 大腸菌コロニーの周期的成長パターン

    Tesuo Yoshino, Sachie Ebara, Sachihiko Tonomura, Rie Tokitra, Takaki Katoh, Jun-chi Wakita, Yusuke Maeda, Masaki Sano, Tohei Matsuyama, Mitsugu Matsushita

    日本物理学会 2009年秋季大会  ( 熊本大学黒髪キャンパス )   2009.9  日本物理学会

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  • 枯草菌のサイズ分布(2)

    Jun-ichi Wakita, Tohei Matsuyama, Mitsugu Matsushita

    日本物理学会 2009年秋季大会  ( 熊本大学黒髪キャンパス )   2009.9  日本物理学会

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  • P. mirabilisの同心円状パターン

    Sachihiko Tonomura, Sachie Ebara, Tetsuo Yoshino, Jun-chi Wakita, Tohei Matsuyama, Mitsugu Matsushita

    日本物理学会 2009年秋季大会  ( 熊本大学黒髪キャンパス )   2009.9  日本物理学会

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  • 枯草菌のサイズ分布

    Jun-ichi Wakita, Tohei Matsuyama, Mitsugu Matsushita

    日本物理学会 第64回年次大会  ( 立教大学、立教池袋中学・高校 )   2009.3  日本物理学会

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  • 緑膿菌コロニーのパターン形成

    Mariko Koyano, Jun-ichi Wakita, Tohei Matsuyama, Mitsugu Matsushita

    日本物理学会 第64回年次大会  ( 立教大学、立教池袋中学・高校 )   2009.3  日本物理学会

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  • B. subtilisディスク状コロニーの微視的観察(3)

    Jun-ichi Wakita, Tohei Matsuyama, Mitsugu Matsushita

    日本物理学会 2008年秋季大会  ( 岩手大学上田キャンパス )   2008.9  日本物理学会

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  • B. subtilisディスク状コロニーの微視的観察(2)

    Jun-ichi Wakita, Tohei Matsuyama, Mitsugu Matsushita

    日本物理学会 第63回年次大会  ( 近畿大学本部キャンパス )   2008.3  日本物理学会

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  • 大腸菌コロニーのパターン形成(2)

    Rie Tokita, Takaki Katoh, Yusuke Maeda, Jun-ichi Wakita, Masaki Sano, Tohei Matsuyama, Mitsugu Matsushita

    日本物理学会 第63回年次大会  ( 近畿大学本部キャンパス )   2008.3  日本物理学会

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  • B. subtilisディスク状コロニーの微視的観察

    Jun-ichi Wakita, Tohei Matsuyama, Mitsugu Matsushita

    日本物理学会 第62回年次大会  ( 北海道大学札幌キャンパス )   2007.9  日本物理学会

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  • 大腸菌コロニーのパターン形成

    Rie Tokita, Takaki Katoh, Yusuke Maeda, Jun-ichi Wakita, Tohei Matsuyama, Mitsugu Matsushita

    日本物理学会 第62回年次大会  ( 北海道大学札幌キャンパス )   2007.9  日本物理学会

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  • バクテリア・コロニー(B. subtilis)の周期的パターン

    Jun-ichi Wakita, Ismael Rafols, Chihiro Togashi, Taichi Arai, Hiroto Itoh, Tohei Matsuyama, Mitsugu Matsushita

    日本物理学会 1999年秋季大会  ( 岩手大学 )   1999.9  日本物理学会

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  • バクテリア増殖における同心円状コロニーの形成Ⅲ

    Hiroto Itoh, Jun-chi Wakita, Kazuhiko Watanabe, Tohei Matsuyama, Mitsugu Matsushita

    日本物理学会 1999年秋季大会  ( 岩手大学 )   1999.9  日本物理学会

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  • Periodic Growth of Bacillus subtilis Colonies International conference

    J. Wakita, I. Rafols, H. Itoh, T. Matsuyama, M. Matsushita

    Ixth INTERNATIONAL CONGRESS OF BACTERIOLOGY & APPLIED MICROBIOLOGY (16-20 Aug)  ( Sydney, Australia )   1999.8 

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  • Formation of Periodic Ring Pattern by Bacteria Proteus mirabilis International conference

    H. Itoh, J. Wakita, T. Matsuyama, M. Matsushita

    Ixth INTERNATIONAL CONGRESS OF BACTERIOLOGY & APPLIED MICROBIOLOGY (16-20 Aug)  ( Sydney, Australia )   1999.8 

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  • バクテリア増殖による同心円状コロニーの形成Ⅱ

    Hiroto Itoh, Jun-chi Wakita, Tohei Matsuyama, Mitsugu Matsushita

    日本物理学会 1998年秋季大会  ( 琉球大学、沖縄国際大学 )   1998.9  日本物理学会

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  • Formation of Dense-Branching-Morphology-like Colonies in Bacteria International conference

    J. Wakita, I. Rafols, H. Itoh, T. Matsuyama, M. Matsushita

    STATPHYS 20 (20-25 Jul)  ( The UNESCO Center, Paris )   1998.7 

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  • Characterization of Concentric Ring Patterns in Bacterial Colonies International conference

    I. Rafols, J. Wakita, T. Matsuyama, M. Matsushita

    XV Sitges Conference on Statistical Mechanics (8-12 Jun)  ( Sitges, Barcelona, Spain )   1998.6 

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  • バクテリアコロニーのDBM的パターン形成機構

    Jun-chi Wakita, Ismael Rafols, Hiroto Itoh, Tohei Matsuyama, Mitsugu Matsushita

    日本物理学会 第53回年次大会  ( 東邦大学、日本大学 )   1998.4  日本物理学会

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  • バクテリア増殖による同心円状コロニーの形成

    Hiroto Itoh, Ismael Rafols, Jun-ichi Wakita, Tohei Matsuyama, Mitsugu Matsushita

    日本物理学会 第53回年次大会  ( 東邦大学、日本大学 )   1998.4  日本物理学会

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  • Pattern Formation in Bacterial Colonies and Its Modelling Invited International conference

    M. Matsushita, J. Wakita, H. Itoh, I. Rafols, T. Matsuyamah, H. Sakaguchi, M. Mimura

    2nd Tohwa International Meeting on Statistical Physics (4-7 Nov, 1997)  ( Fukuoka, Japan )   1997.11 

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  • Experimental Study of Concentric Ring Patterns in Bacterial Colonies International conference

    I. Rafols, J. Wakita, H. Itoh, T. Matsuyama, M. Matsushita

    2nd Tohwa International Meeting on Statistical Physics (4-7 Nov, 1997)  ( Fukuoka, Japan )   1997.11 

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  • Characterization of Ring Patterns in Bacterial Colonies

    Ismael Rafols, 脇田順一, 伊藤裕人, 松山東平, 松下貢

    日本物理学会1997年秋季大会  ( 神戸大学 )   1997.10  日本物理学会

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  • バクテリア・コロニーの形態形成 Invited

    Jun-ichi Wakita

    第2回WAKOつくばフォーラム  ( 筑波和光ホール )   1997.5 

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  • 細菌コロニー(B. subtilis)のDBMパターンとリングパターン形成機構

    Jun-ichi Wakita, Ismael Rafols, Hiroto Itoh, Tohei Matsuyama, Mitsugu Matsushita

    日本物理学会 第52回年次大会  ( 名城大学 )   1997.3  日本物理学会

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  • 細菌コロニーの成長界面における自己アフィン性Ⅱ

    Hiroto Itoh, Jun-ichi Wakita, Tohei Matsuyama, Mitsugu Matsushita

    日本物理学会 第52回年次大会  ( 名城大学 )   1997.3  日本物理学会

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  • Interface Growth and Pattern Formation in Bacterial Colonies Invited International conference

    M. Matsushita, J. Wakita, H. Itoh, I. Rafols, T. Matsuyama, H. Sakaguchi, M. Mimura

    5th Bar-Ilan Conference on Frontiers Condensed Matter Physics (31 March-3 April, 1997)  ( Ramat- Gan, Israel )   1997.3 

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  • バクテリアコロニー成長におけるサーファクタントの影響

    Jun-ichi Wakita, Hiroto Itoh, Akio Nakahara, Mitsugu Matsushita, Tohei Matsuyama

    日本物理学会 1995年秋季大会  ( 大阪府立大学 )   1995.9  日本物理学会

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  • バクテリア(P.mirabilis)によるリングパターンと時空パターンの形成

    Akio Nakahara, Yuji Shimada, Osamu Moriyama, Jun-ichi Wakita, Mitsugu Matsushita, Tohei Matsuyama

    日本物理学会 1995年秋季大会  ( 大阪府立大学 )   1995.9  日本物理学会

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  • バクテリア増殖によるパターン形成(サーファクタントの影響)

    Akio Nakahara, Yuji Shimada, Osamu Moriyama, Jun-ichi Wakita, Akio Nakahara, Mitsugu Matsushita, Tohei Matsuyama

    日本物理学会 第50回年次大会  ( 神奈川大学横浜キャンパス )   1995.3  日本物理学会

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  • 細菌コロニーの成長界面における自己アフィン性

    Hiroto Itoh, Norikazu Nakatoh, Jun-ichi Wakita, Akio Nakahara, Mitsugu Matsushita, Tohei Matsuyama

    日本物理学会 第50回年次大会  ( 神奈川大学横浜キャンパス )   1995.3  日本物理学会

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  • Growth Dynamics of Bacterial Colonies and Their Morphological Change Invited International conference

    M. Matsushita, J. Wakita, K. Komatsu, A. Nakahara, T. Matsuyama

    International Conference on Dynamical Systems and Chaos (23-27 May, 1994)  ( Tokyo, Japan )   1994.5 

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  • バクテリア増殖によるパターン形成

    Kenji Komatsu, Jun-ichi Wakita, Akio Nakahara, Mitsugu Matsushita, Tohei Matsuyama

    日本物理学会 第49回年次大会  ( 福岡工業大学 )   1994.3  日本物理学会

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  • Growth and Morphological Changes of Bacteria Colonies Invited International conference

    M. Matsushita, J. Wakita, T. Matsuyama

    NATO Advanced Research Workshop, Santa Fe Institute Studies in the Sciences of Complexity (13-17 Apr, 1993).  ( Santa Fe, NM )   1993.4 

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  • バクテリア増殖によるパターン形成

    Jun-ichi Wakita, Kenji Komatsu, Mitsugu Matsushita, Koukichi Kawasaki, Nanako Shigesada

    日本物理学会 第48回年次大会  ( 東北大学仙台キャンパス )   1993.3  日本物理学会

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Awards

  • JPSJ Papers of Editors's Choice

    2015.10   The Physical Society of Japan   Self-Elongation with Sequential Folding of Filament of Bacterial Cells

    Ryojiro Honda, Jun-ichi Wakita, Makoto Katori

Research Projects

  • Collective Motion of Bacterial Cells in a Two-dimensional Circular Pool

    2015.4 - 2018.3

    文部科学省  科学研究費補助金(日本学術振興会・文部科学省)-挑戦的萌芽研究 

    脇田 順一

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount: \2730000

    "Various types of spatiotemporal behavior of collective organisms have attracted the attention of many researchers in not only biological sciences but also physical and mathematical sciences. In this study, we focus on the collective motion of bacterial cells in a shallow circular pool. The aim is to clarify the collective motion from the view point of statistical physics."

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Allotted class

  • 2024   Graduation Thesis Ⅰ   Department

  • 2024   Graduation Thesis Ⅱ   Department

  • 2024   Laboratory Practices in Physics   Department

  • 2024   Physics 1   Department

  • 2024   Physics of Complex Systems   Department

  • 2024   Electromagnetism 1   Department

  • 2024   Physics of Pattern FormationⅠ   Graduate school

  • 2024   Doctoral Research Ⅰ   Graduate school

  • 2024   Doctoral Research Ⅱ   Graduate school

  • 2024   Doctoral Research Ⅲ   Graduate school

  • 2024   Doctoral Research Ⅳ   Graduate school

  • 2024   Doctoral Research Ⅴ   Graduate school

  • 2024   Doctoral Research Ⅵ   Graduate school

  • 2024   Special lecture on physics   Graduate school

  • 2024   Master's Research Ⅰ   Graduate school

  • 2024   Master's Research Ⅲ   Graduate school

  • 2024   Master's Research Ⅱ   Graduate school

  • 2024   Master's Research Ⅳ   Graduate school

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Teaching Experience

  • 環境・生命科学概論

    Institution:中央大学

  • パターン形成物理学特論第二

    Institution:中央大学

  • パターン形成物理学特論第一

    Institution:中央大学

  • 電磁気学及演習1

    Institution:中央大学

  • 統計力学及演習1

    Institution:中央大学

  • 物理数学及演習2

    Institution:中央大学

  • 複雑系物理学

    Institution:中央大学

  • 現代物理学序論

    Institution:中央大学

  • エレクトロニクス

    Institution:中央大学

  • 物理情報計測

    Institution:中央大学

  • 物理2

    Institution:中央大学

  • 物理1(既修)

    Institution:中央大学

  • 物理実験

    Institution:中央大学

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