Proceedings of the Japan Academy, Series B
Online ISSN : 1349-2896
Print ISSN : 0386-2208
ISSN-L : 0386-2208
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Volume 67, Issue 7
Displaying 1-5 of 5 articles from this issue
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  • Spectral Analysis of the Cool BaII Star HD 121447
    Kazuhiko UTSUMI
    1991 Volume 67 Issue 7 Pages 107-110
    Published: 1991
    Released on J-STAGE: October 13, 2006
    DOIhttps://doi.org/10.2183/pjab.67.107
    JOURNAL FREE ACCESS
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    The wavelengths, intensities, and identifications of about 5, 000 lines in the spectrum of the coolest Ball star HD 121447 from 4215A to 6720A have been completed. Radial velocities were determined for ten spectrograms of HD 121447. HD 121447 seems to be a radial velocity variable, and may be a binary.
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  • Spectral Analysis of the CS Star R CMi
    Kazuhiko UTSUMI
    1991 Volume 67 Issue 7 Pages 111-114
    Published: 1991
    Released on J-STAGE: October 13, 2006
    DOIhttps://doi.org/10.2183/pjab.67.111
    JOURNAL FREE ACCESS
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    The wavelengths, intensities, and identifications of about 3, 700 lines in the spectrum of the CS star R CMi from 4180A to 6720A have been completed. Atomic lines are predominant in R CMi. The molecular bands observed in R CMi are not different but much weaker than in the cool carbon stars.
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  • Interaction between Subducted Oceanic Slab and Wedge Mantle Inferred from Across-arc Variations of Pb, Sr and Nd Isotopic Compositions in Northeastern Japan
    Tomoyuki SHIBATA, Eizo NAKAMURA
    1991 Volume 67 Issue 7 Pages 115-120
    Published: 1991
    Released on J-STAGE: October 13, 2006
    DOIhttps://doi.org/10.2183/pjab.67.115
    JOURNAL FREE ACCESS
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    Isotopic compositions of Pb, Sr and Nd have been determined for island arc basalts from northeastern Japan. The Sr and Pb isotopic ratios decrease, and Nd isotopic ratios increase from the volcanic front towards the back-arc side. The isotopic compo sition sat the most back-arc side are nearly identical to those of MORB, indicating that the across-arc isotopic variations were caused by a two-component mixing between MORB-type wedge mantle and oceanic sediments with different degrees of sediment involvement which depend on the depth of subducting oceanic slab. The abundance ratios among Pb, Sr and Nd in the subducted oceanic sediment were estimated from the mixing relationships in the isotope compositions. The estimated Sr/Pb ratio of subducted sediments does not change during subduction, while the Nd/Sr and Nd/Pb increase towards the back-arc side. These observations suggest that the subduction component was added to the wedge mantle as a fluid through the dehydration of subducted oceanic sediment and the degree of dehydration decreases with increase in the depth of slab, and that the subducting oceanic slab does not melt beneath northeastern Japan.
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  • Accumulation of Inositol 1, 4, 5-Trisphosphate in the Rat Brain as a Result of Long-term Administration of Lithium
    Yoshio ISHIMA, Keizo WAKU
    1991 Volume 67 Issue 7 Pages 121-124
    Published: 1991
    Released on J-STAGE: October 13, 2006
    DOIhttps://doi.org/10.2183/pjab.67.121
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    Three-week-old male rats were given 2.7mEq Li2CO3/kg/day orally for 1 or 3 weeks, and the level of IP3 in the brain was estimated. Although the level of IP3 was not affected by the administration of Li2CO3, IP3 was further fractionated to I-1, 3, 4-P3 and I-1, 4, 5-P3 by HPLC. The relative percentages of I-1, 3, 4-P3 and I-1, 4, 5-P3 were 95.8 and 4.2 in controls and 69.6 and 30.4 in brains of rats treated with lithium. Since I-1, 4, 5-P3 is known to be a messenger inside the cells to regulate cell-to-cell communication compared with I-1, 3, 4-P3, this increase in the relative level of I-1, 4, 5-P3 in the brain might be relevant for the treatment of manic-depressive disorders.
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  • A Dystrophin Homologue on the Surface Membrane of Embryonic and Denervated mdx Mouse Muscle Fibers
    Masakazu TAKEMITSU, Shoichi ISHIURA, Ritsuko KOGA, Kiichi ARAHATA, Iku ...
    1991 Volume 67 Issue 7 Pages 125-128
    Published: 1991
    Released on J-STAGE: October 13, 2006
    DOIhttps://doi.org/10.2183/pjab.67.125
    JOURNAL FREE ACCESS
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    With immunohistochemical staining using polyclonal antibodies against the carboxyl terminus of a dystrophin molecule, the surface membranes of fetal and denervated adult muscle fibers and the neuromuscular junctions in dystrophin deficient mdx mice showed positive immunoreactivity. The behavior of the positively stained protein was similar to that of the acetylcholine receptor. We conclude that this immunoreactive protein, probably a dystrophin-related protein, plays a role in the assembly of junctional proteins.
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