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Nishiguchi Lab
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The lab explores universal laws from the collective motion of swarms of bacteria and artificial particles.
AboutAbout the lab
Seeking universal laws governing swarms of living things.
The Nishiguchi Lab studies the physics of active matter, which consists of assemblies of self-propelled objects.
Using swimming bacteria and artificial microparticles (Janus particles) that start swimming when an electric field is applied, the lab experimentally investigates the motion of swarms.
By comparing the results with theory and numerical computation, it clarifies what kinds of order and fluctuations appear within a swarm.
The lab also studies the mechanism of the thin hair-like appendages on the bacterial surface (type IV pili) from the viewpoint of nonequilibrium physics.
Key terms
- Active matter
- A system made up of many objects, such as bacteria and cells, that use energy of their own to move around
- Janus particle
- A microparticle whose two sides have different properties. A particle with one hemisphere coated in metal swims in water when an electric field is applied
- Type IV pili
- Thin fibers that many bacteria extend from and retract into their surface. They are used to attach to objects and to move around
NewsLab news
A paper by Associate Professor Nishiguchi and colleagues was published in Seibutsu Butsuri
Associate Professor Nishiguchi received the "Institute of Science Tokyo Challenging Research Award" (National University Corporation Institute of Science Tokyo)
Clarifying the route by which swarms of swimming bacteria arrive at chaotic flow (PNAS)
A paper by Associate Professor Nishiguchi and colleagues was published in the Proceedings of the National Academy of Sciences
ResearchResearch themes
Associate Professor Nishiguchi has experimentally investigated what kinds of order and fluctuations emerge when self-propelled bacteria and artificial microparticles form swarms. Combining these experiments with theory and numerical computation, the lab explores universal laws that emerge from such motion.
*Illustrative imageBacterial Swarms with Aligned Orientation
By confining Escherichia coli in a thin liquid layer and elongating the cells, the lab experimentally created a state in which the whole swarm is aligned in one orientation. It also confirmed the giant density fluctuations that theory had predicted.
*Illustrative imageTurning Bacterial Turbulence into a Vortex Lattice
The lab found that when the turbulent flow created by a swarm of Bacillus subtilis is made to flow through a regular array of thin pillars, an order spontaneously emerges in which vortices line up with alternating directions of rotation. It also presented an approach to designing the arrangement of vortices through the placement of the pillars.
*Illustrative imageCollective Motion of Swimming Artificial Particles
Using Janus particles that swim in an electric field, the lab investigates swarm motion under finely controlled conditions that are difficult to achieve with living organisms. It also studied the laws governing the motion of chains of linked particles that undulate like sperm flagella.
*Illustrative imageDynamics of Bacterial Pili
The lab continues its research on type IV pili, which began at the Pasteur Institute in Paris, from the viewpoint of nonequilibrium physics. It has also carried out research that explains, through experiments and theory, how the pili of Neisseria meningitidis attach to the cells lining the inside of blood vessels.
MembersFaculty
- Associate ProfessorDaiki NishiguchiPublications ↗
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “A starling murmuration near Gretna - geograph.org.uk - 5980881” Walter Baxter / CC BY-SA 2.0 (cropped)
- Bacterial Swarms with Aligned Orientation: “E coli at 10000x, original” Photo by Eric Erbe, digital colorization by Christopher Pooley, both of USDA, ARS, EMU. / Public domain (cropped)
- Turning Bacterial Turbulence into a Vortex Lattice: “Bacillus subtilis Gram” Y tambe (original uploader) / CC BY-SA 3.0 (cropped)
- Collective Motion of Swimming Artificial Particles: “SEM Image of Colloidal Particles” Yasrena / CC BY-SA 4.0 (cropped)
- Dynamics of Bacterial Pili: “Neisseria meningitidis CSF Gram 1000” Microman12345 / CC BY-SA 4.0 (cropped)
- Related lab (笹本研究室): “Quantum material’s subtle spin behavior proves theoretical prediction ( )” Oak Ridge National Laboratory / CC BY 2.0 (cropped)
- Related lab (賀川研究室): “Meissner effect p1390048” Mai-Linh Doan / CC BY-SA 3.0 (cropped)
- Related lab (花井研究室): “A starling murmuration - geograph.org.uk - 6389346” Walter Baxter / CC BY-SA 2.0 (cropped)
- Related lab (平原研究室): “Graphite-layers-side-3D-balls” Benjah-bmm27 / Public domain (cropped)
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