Visiting Professor: Ken TAKAI, Ph.D.
(Affiliation: Japan Agency for Marine-Earth Science and Technology)
E-mail: kent[at]
Link: Research Achievements (External site opens in a new window)
Link: Website of Takai Group at JAMSTEC(External site opens in a new window)





We look for real limits of life and biosphere and boundary conditions between habitable and uninhabitable in the dark world, namely deep-sea and deep subsurface environments by means of top-rated exploration platforms such as human-occupied submersible vehicle (HOV), remotely operative vehicles (ROV), research vessels including scientific drilling vessels. Naturally observed limits of life and biosphere and fringe functional mechanisms provide significant clues to understanding universal and specific habitability of living forms, finding unique chemical and biological systems established in the long history of evolution and synthesizing novel artificial systems in laboratory and for application.



1. T Nunoura et al, A primordial and reversible TCA cycle in a facultatively chemolithoautotrophic thermophile, Science 359 (6375), 559-563. (2018)

2. K Yanagawa et al, Defining boundaries for the distribution of microbial communities beneath the sediment-buried, hydrothermally active seafloor, The ISME journal 11 (2), 529. (2017)

3. Y Takaki et al, Hadal biosphere: insight into the microbial ecosystem in the deepest ocean on Earth. T Nunoura, Proceedings of the National Academy of Sciences, 201421816. (2015)

Back to top of page