Large-scale observations of the cycle of bioelements in open oceans
Understanding the mechanisms underlying systems of interaction between organic matter and microorganisms in oceans
Developing new analytical methods for marine ecological systems and biogeochemical processes based on various stable and radioactive isotopes
Biogeochemistry and the preservation of coral-reef ecological systems 
Surveys of ecological systems and biogeochemical processes in post-earthquake ocean regions off the Sanriku coast