Future efforts to contribute to the International Height Reference System (IHRS)

The Tenth Symposium on Polar Science/Special session: [S] Future plan of Antarctic research: Towards phase X of the Japanese Antarctic Research Project (2022-2028) and beyond, Tue. 3 Dec. / Entrance Hall (1st floor) at National Institute of Polar Research (NIPR

Tidal observation around Syowa Station, Antarctica

第2回極域科学シンポジウム/第31回極域地学シンポジウム 11月16日（水） 国立国語研究所　2階フロ

Novel psychropiezophilic Oceanospirillales species Profundimonas piezophila gen. nov., sp. nov., isolated from the deep-sea environment of the Puerto Rico trench

The diversity of deep-sea high-pressure-adapted (piezophilic) microbes in isolated monoculture remains low. In this study, a novel obligately psychropiezophilic bacterium was isolated from seawater collected from the Puerto Rico Trench at a depth of ~ 6,000 m. This isolate, designated YC-1, grew best in a nutrient rich marine medium with an optimal growth hydrostatic pressure of 50 MPa (range 20-70 MPa) at 8 °C. Under these conditions the maximum growth rate was extremely slow, 0.017 h-1, and the maximum yield was 3.51 × 107 cells ml-1. Cell size changed with pressure, shifting from 4.0-5.0 μm in length and 0.5-0.8 μm in width at 60 MPa, to 0.8-1.0 μm diameter coccoid cells under 20 MPa, the minimal pressure required for growth. YC-1 is a Gram-negative, non-flagellum forming, facultative anaerobic heterotroph. Its predominant cellular fatty acids are the monounsaturated fatty acids (MUFAs) C16:1 and C18:1. Unlike many other psychropiezophiles YC-1 does not synthesize any polyunsaturated fatty acids (PUFAs). Phylogenetic analysis placed YC-1 within the family of Oceanospirillaceae, closely related to the uncultured symbiont of the deep-sea whale bone-eating worms of the genus Osedax. In common with some other members of the Oceanospirillales, including those enriched during the Deepwater Horizon oil spill, YC-1 is capable of hydrocarbon utilization. Based on its characteristics, YC-1 appears to represent both a new genus and a new species which we name “Profundimonas piezophila” gen. nov., sp. nov

Detecting sea level and mass variability in the Southern Ocean using geodetic and oceanographic methods

第3回極域科学シンポジウム/第32回極域地学シンポジウム 11月29日（木） 統計数理研究所 ３階セミナー

Twenty years\u27 progress of Syowa Station, as a global geodesy observatory in Antarctica

第3回極域科学シンポジウム/第32回極域地学シンポジウム 11月29日（木） 統計数理研究所 ３階セミナー

Preliminary report of electromagnetic soundings on East Ongul Island, Antarctica

Observations of the telluric field were carried out at Syowa Station (69°S, 39°35\u27E) in Lutzow Holm Bay, East Antarctica from May 22, 1995 to January 31, 1996. Telluric fields at Syowa Station have strong anisotropy which varies with frequency. Major axis of electrical variations at high frequency (0.1 Hz-0.5Hz) trend almost N60°E and those at low frequency (1mHz-10mHz) have a N135°E trending major axis. These results suggest that electrical anisotropy exists beneath Syowa Station and the trend changes from N60°E to N135°E with depth