Our research interests are focused on revealing novel ecological functions of bacteria and archaea playing key roles in biogeochemical processes on Earth. For this, we obtain uncultivated microbes of nitrogen, sulfur, phosphorous, and carbon cycles from environments with the help of NGS and metagenomics technologies. The main theme is (meta)genomics-enabled ecophysiology studies of environmentally relevant microbes. Our research contributes to addressing environmental problems caused by imbalance of global biogeochemical cycles: greenhouse gas emission, eutrophication, microplastics and chemical pollutions, etc.,