Associate Professor
Geosphere and Biosphere Science Group

Office: -535
TEL: +81-3-5841-4544
FAX: +81-3-5841-2534

Research Field

Geomicrobiology, geochemistry, nanomineralogy, martian life exploration, planetary protection

Current Research

Life is ubiquitous not only in the near-surface environment where sunlight is converted into biological energy via photosynthesis, but also in the deep-sea and crustal environments associated with chemical fluxes that sustain chemosynthesis. Our accessibility to the deep biosphere has been dramatically expanded over the past few decades, which provides us opportunities to glimpse novel ecosystems. We are studying organisms that thrive in the surface and deep environments and the physicochemical property of their habitat to constrain the abundance, distribution and limit of life on earth. We are also studying intricate and diverse interplays between earth and life to understand biological roles to shape and underpin our planet throughout the earth’s history. Our primary targets are: 1) Crustal biosphere harbored in subterranean granite and subseafloor basalt2) Biogeochemical processes mediated in deeply buried marine sediments3) Symbiosis and evolution of chemosynthetic animals at deep-sea hydrothermal ventsA manned submersible Shinkai 6500 and underground laboratories are used to obtain deep biosphere samples as well as for in-situ measurements.

Representative Publications

1. Suzuki Y, Kelly SD, Kemner KM, Banfield JF (2002) Nanometer-size products of uranium bioreduction. Nature , 419, 134.
2. Suzuki Y, Kopp RE, Kogure T, Suga A, Takai K, Tsuchida S, Ozaki N, Endo K, Hashimoto J, Kato Y, Mizota C, Hirata T, Chiba H, Nealson KH, Horikoshi K, Kirschvink JL (2006) ScleriteSuzuki Y, Sasaki T, Suzuki M, Nogi Y, Miwa T, Takai K, Nealson KH, Horikoshi K (2005) Novel Chemoautotrophic endosymbiosis between a member of the Epsilonproteobacteria and the hydrothermal-vent gastropod Alviniconcha aff. hessleri (Gastropoda:Provannidae) from the Indian Ocean, Appl. Environ. Microbiol., 71, 5440-5450.
3. Suzuki Y, Mukai H, Ishimura T, Yokoyama TD, Sakata S, Hirata T, Iwatsuki T, Mizuno T (2016) Formation and Geological Sequestration of Uranium Nanoparticles in Deep Granitic Aquifer. Scientific Reports, doi:10.1038/srep2270.