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  • 1
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    Magnetic anomalies at sea around the northern part of Japan. (2020)
    Details
    Publication Date: 2021-05-19
    Description: Detailed magnetic surveys were carried out at sea around the northern part of Japan as part of “The Basic Map of the Sea Project” by the Hydrographic Department of Japan from 1968 to 1972. Tracklines are spaced every two nautical miles in most part of the surveyed areas, where geomagnetic total intensity was measured by means of proton magneto-meters. Magnetic anomalies of the surveyed areas show four significant features as follows. i ) Lineated patterns of magnetic anomalies found at the north-west Pacific basin have proved extending over the continental slope off the Tohoku District across Japan Trench. ii) Remarkable positive anomaly zones exist along the Pacific coast of Japan. They are parallel to the southern part of the Kuril-Kamchatka Trench and to the northern part of Japan Trench. iii) In the Japan Sea, anomaly patterns are extremely complicated, positive and negative anomalies being distributed like a patch works. iv) Continental shelf of the Okhotsk Sea is characterized by wide and smooth negative anomalies with locally very strong negative values found at limited areas. The positive linear anomalies along the Pacific coast of Japan were examined by calculating numerically the magnetizations which are thought to cause the anomalies. From the results it is found that the one on the coast of the southeast Hokkaido can be explained by a normally magnetized horizontal layer, but that the other along the east coast of Tohoku District can be explained by a magnetized body having a westward component of magnetization. This facts have led us to a conclusion that the Tohoku District must have turned counter-clockwise after the layer causing positive anomalies had been formed. This conclusion coincides well with the palaeomagnetic results from rock samples on land obtained by Kawai, et. al. (1962).
    Description: Published
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.39-44
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  • 2
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    Computer aided hydrographic survey and processing system of the survey vessel Shoyo. (2020)
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    Publication Date: 2021-05-19
    Description: A computer aided hydrographic survey system of the survey vessel “SYOYO”has been completed. Positioning, data acquisition, data processing are done by using a computer PANA FACOM U-1200. The computer provides accurate positioning from the integration of the NNSS (Navy Navigation Satellite System), the Loran C, and the other associated navigation sensors In this system, Loran C position is calculated by multi-LOP (Line Of Position）fixing up to 14 LOP’s of 6 hyperbolic LOP’s and 8 range LOP's, and corrected by a unique calibration method. The computer calculates differences between NNSS fixes and Loran C fixes to minimize variance of NNSS fixing, and decides reliable calibration values by a weighted mean method. The data processing programs included in the system produces a bathymetric contour chart, a sounding chart, a track chart and other charts. These charts are very available on conducting survey. As far sounding, the automatic echo sounder occasionally provides erroneous depth data Therefore, we have developed a sub- system to replace erroneous data with interactively re-digitized depth values from analog graphic records of the echo sounder.
    Description: Published
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.23-40
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  • 3
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    Submarine topography of the eastern Sagami Trough to the triple junction. (2020)
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    Publication Date: 2021-05-19
    Description: This report summarizes the results of a sea-bottom survey in the eastern Sagami Trough to the triple junction of plates by the survey vessel "TAKUYO" on May and June, 1984. The survey, using a multi narrow beam echo sounder (SEA BEAM), revealed that a meandering deep canyon, the Boso Canyon (BOC), exists along the north border of the Sagami Trough. Up to this time, the canyon had been thought to be composed of echelon depressions. The BOC is a part of a long canyon with a length of more than 300 kilometers (from Sagami Bay to the Izu-Ogasawara Trench). As the longitudinal profile of the bottom of the BOC shows no undulation, it suggests that the BOC is a transporting route of sediments gathered from a wide back area. Another submarine canyon, the Awa Canyon (AWC), runs along the southern border of the Sagami Trough, parallel to the BOC. Its topography is in great contrast to the BOC. For instance, the AWC is a shallow valley with a gentle slope and is shallower than 4,500 meters (a singular canyon making small depressions of greater than 4,500 meters). It is worth noting that the bottom of the Sagami Trough is the AWC in the shallower part, and it transfers to the BOC in the deeper parts. Considering the topographical features and the seismic profiles, the material boundary of plates in the eastern Sagami Trough seems to be along the bottom of trough (as mentioned). At the triple junction, three topographic belts parallel to the direction of the Izu-Ogasawara Trench, (wide trench floors, inner highs and small basins) are recognized.
    Description: Published
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.1-24
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  • 4
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    Neel transition in (Mg,Fe)O: A possible change of magnetic structure (2011)
    Mineralogical Society of America
    Details
    Publication Date: 2011-02-01
    Description: The Neel temperature (TN) of (Mg1-X,FeX)O and its compositional dependence have been studied with a superconducting quantum interference device (SQUID) in the temperature range 5-300 K at constant magnetic field of 1000 Oe. We determined the magnetic phase diagram at ambient pressure. As the TN constantly increased with iron content, we found a kink in the paramagnetic-antiferromagnetic boundary at around X = 0.5, which suggests a possible change of the magnetic structure in the antiferromagnetic state. We propose that the magnetic boundary ends at X = 0.12(1) and 0 K. Our results show that the pressure of the rhombohedral distortions of (Mg,Fe)O can be very sensitive to Fe content if the structure distortion is correlated to magnetic ordering.
    Print ISSN: 0003-004X
    Electronic ISSN: 1945-3027
    Topics: Geosciences
    Published by Mineralogical Society of America
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  • 5
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    TAG-1–assisted progenitor elongation streamlines nuclear migration to optimize subapical crowding (2013)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2013-10-29
    Description: Nature Neuroscience 16, 1556 (2013). doi:10.1038/nn.3525 Authors: Mayumi Okamoto, Takashi Namba, Tomoyasu Shinoda, Takefumi Kondo, Tadashi Watanabe, Yasuhiro Inoue, Kosei Takeuchi, Yukiko Enomoto, Kumiko Ota, Kanako Oda, Yoshino Wada, Ken Sagou, Kanako Saito, Akira Sakakibara, Ayano Kawaguchi, Kazunori Nakajima, Taiji Adachi, Toshihiko Fujimori, Masahiro Ueda, Shigeo Hayashi, Kozo Kaibuchi & Takaki Miyata
    Print ISSN: 1097-6256
    Electronic ISSN: 1546-1726
    Topics: Biology , Medicine
    Published by Nature Publishing Group (NPG)
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  • 6
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    Dark-operative protochlorophyllide oxidoreductase generates substrate radicals by an iron-sulphur cluster in bacteriochlorophyll biosynthesis (2014)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2014-06-27
    Description: Photosynthesis converts solar energy to chemical energy using chlorophylls (Chls). In a late stage of biosynthesis of Chls, dark-operative protochlorophyllide (Pchlide) oxidoreductase (DPOR), a nitrogenase-like enzyme, reduces the C17 = C18 double bond of Pchlide and drastically changes the spectral properties suitable for photosynthesis forming the parental chlorin ring for Chl a. We previously proposed that the spatial arrangement of the proton donors determines the stereospecificity of the Pchlide reduction based on the recently resolved structure of the DPOR catalytic component, NB-protein. However, it was not clear how the two-electron and two-proton transfer events are coordinated in the reaction. In this study, we demonstrate that DPOR initiates a single electron transfer reaction from a [4Fe-4S]-cluster (NB-cluster) to Pchlide, generating Pchlide anion radicals followed by a single proton transfer, and then, further electron/proton transfer steps transform the anion radicals into chlorophyllide (Chlide). Thus, DPOR is a unique iron-sulphur enzyme to form substrate radicals followed by sequential proton- and electron-transfer steps with the protein folding very similar to that of nitrogenase. This novel radical-mediated reaction supports the biosynthesis of Chl in a wide variety of photosynthetic organisms. Scientific Reports 4 doi: 10.1038/srep05455
    Electronic ISSN: 2045-2322
    Topics: Natural Sciences in General
    Published by Nature Publishing Group (NPG)
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  • 7
    Electronic Resource
    Electronic Resource
    Phase transitions of MnO to 137 GPa (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 4153-4159 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An in situ x-ray study up to 137 GPa using a diamond anvil cell combined with synchrotron x-ray radiation has revealed three new phase transitions in MnO. The rhombohedral distortion from a B1 structure starts at about 30 GPa. The volume compression curve of the distorted phase is in good agreement with recent shock compression experiments, suggesting the possibility of a paramagnetic–antiferromagnetic transition associated with the increase of the Néel temperature (TN). A drastic change in the x-ray pattern was observed at about 90 and 120 GPa. The transition pressure of 90 GPa is also consistent with shock compression data. The phases above 90 GPa were expected to be metallic based on the highly reflective nature of the sample. The crystal structure of the high pressure phase above 120 GPa was successfully explained by a B8 (NiAs) structure as expected based on recent first principles calculations. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373045
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  • 8
    Electronic Resource
    Electronic Resource
    Laser heated diamond anvil apparatus at the Photon Factory and SPring-8: Problems and improvements : Laser heated diamond cell techniques workshop (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 1293-1297 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Two high pressure high temperature in situ x-ray diffraction systems constructed at the Photon Factory and at SPring-8 are described. Both systems consist of a laser heated diamond anvil cell, CO2 or YAG laser heating systems, and an angle dispersive powder x-ray diffraction system with an imaging plate detector. CO2 laser heating has an advantage in that the sample can be heated stably and uniformly due to stable absorption of the sample. Use of type-IIa diamond, however, caused plastic deformation of the anvils. YAG laser heating, compared to CO2 laser heating, can be used to much higher pressures and temperatures, although a good control system is required for stable heating. Various problems encountered during construction are discussed. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1343868
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  • 9
    Electronic Resource
    Electronic Resource
    Metastable garnet in oceanic crust at the top of the lower mantle (2002)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 420 (2002), S. 803-806 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] As oceanic tectonic plates descend into the Earth's lower mantle, garnet (in the basaltic crust) and silicate spinel (in the underlying peridotite layer) each decompose to form silicate perovskite—the ‘post-garnet’ and ‘post-spinel’ transformations, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature01281
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  • 10
    Electronic Resource
    Electronic Resource
    The Prevention of Postoperative Intraperitoneal Adhesions by Tranilast: N-(3′,4′-dimethoxycinnamoyl)Anthranilic Acid (1999)
    Springer
    Surgery today 29 (1999), S. 51-54 
    Details
    ISSN: 1436-2813
    Keywords: Key Words: postoperative adhesion ; prevention ; abdominal surgery ; tranilast
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: N -(3′,4′-dimethoxycinnamoyl)anthranilic acid) in preventing postoperative adhesion formation. The adhesion model was established in 12 male Donryu rats. This involved two essential factors, drying and bleeding. Another 22 male Donryu rats were used to study the prevention of intraperitoneal adhesions. Tranilast was administered orally pre- and postoperatively. Adhesion strength was evaluated by grading, and basic fibroblast growth factor (bFGF) and transforming growth factor-beta-1 (TGF-β1) concentration were measured. Postoperative intraperitoneal adhesions were seen in all rats, but the adhesions in the tranilast group were significantly less severe than those in the control group. Serum bFGF and TGF-β1 levels in the tranilast group were lower at the time of surgery than those in the control group, and bFGF levels were lower at the endpoint of this study in the tranilast group than in the control group. The TGF-β1 levels at the end-point did not differ between the two groups. These findings demonstrated that tranilast significantly reduced postoperative intraperitoneal adhesion formation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s005950050356
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