Proceedings of the Japan Academy, Series B
Online ISSN : 1349-2896
Print ISSN : 0386-2208
ISSN-L : 0386-2208
Volume 82 , Issue 9
Showing 1-5 articles out of 5 articles from the selected issue
Reviews
  • Takashi NAKAMURA
    2006 Volume 82 Issue 9 Pages 311-327
    Published: 2006
    Released: December 12, 2006
    JOURNALS FREE ACCESS
    Numerical simulations were performed for the formation process of rotating black holes. It is suggested that Kerr black holes are formed for wide ranges of initial parameters. The nature of gravitational waves from a test particle falling into a Kerr black hole as well as the development of 3D numerical relativity for the coalescing binary neutron stars are discussed.

    (Communicated by Chushiro HAYASHI, M.J.A.)
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  • Jun KONDO
    2006 Volume 82 Issue 9 Pages 328-338
    Published: 2006
    Released: December 12, 2006
    JOURNALS FREE ACCESS
    The phenomenon of the resistance minimum in dilute magnetic alloys is explained in terms of the s-d interaction which takes account of scattering of the conduction electron off the magnetic impurities in metals. Some of the intermetallic compounds which involve rare earth elements or uranium show a very large electronic specific heat and remain non-magnetic even though they show a Curie-like susceptibility at higher temperatures. These phenomena are also explained based on the s-d interaction model.

    (Contributed by Jun KONDO, M.J.A.)
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  • Masami MURAMATSU, Masaharu SAKAI
    2006 Volume 82 Issue 9 Pages 339-352
    Published: 2006
    Released: December 12, 2006
    JOURNALS FREE ACCESS
    The molecular mechanism of any tumor marker expression may shed a light on the mechanism of the particular tumorigenesis. This idea in mind, we have been pursuing the mechanism of specific induction of the placental type glutathione transferase (GST-P) gene during hepatocarcinogenesis of the rat. Making use of advanced technologies of molecular biology including proteomic analysis, gene cloning and production of specific transgenic rats etc., we were able to identify the enhancer and the activator proteins responsible for this tumor marker expression. Negative regulatory regions and modulatory proteins were also found. The overview of this long range study and the future outlook of the problem will be discussed.

    (Communicated by Kumao TOYOSHIMA, M.J.A.)
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Original Papers
  • Jun-ichi NISHIZAWA, Ken SUTO, Tetsuo SASAKI, Tadao TANABE, Takenori TA ...
    2006 Volume 82 Issue 9 Pages 353-358
    Published: 2006
    Released: December 12, 2006
    JOURNALS FREE ACCESS
    One of the most important uses of THz spectrometry is to detect defects in molecular structure or in crystals efficiently. We applied GaP Raman THz (GRT) spectrometer to detect and evaluate defects in inorganic and organic materials. High THz-wave absorption due to high defect density of GaSe crystal lowered the efficiency of THz wave generation, when the crystal is used as nonlinear material for DFG (Difference Frequency Generation). Defects in organic molecules could be observed as changes in frequency, intensities of the absorption, and broadenings of the spectra.

    (Contributed by Jun-ichi NISHIZAWA, M.J.A.)
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  • Letizia MODEO, Giovanna ROSATI, Ilaria ANDREOLI, Simone GABRIELLI, Fra ...
    2006 Volume 82 Issue 9 Pages 359-374
    Published: 2006
    Released: December 12, 2006
    JOURNALS FREE ACCESS
    In the present paper we redescribe the ciliate Chattonidium setense Villeneuve 1937 combining morphological observations (live, stained, scanning, and transmission electron microscope) with behavioral notes and molecular data. Ultrastructural analysis revealed remarkable similarities between Chattonidium and representative members of the class Heterotrichea in cortical structure and cytoplasmic organization. The most similar genus for these aspects appears to be Condylostoma. To verify this relatedness, 18S rRNA genes from Chattonidium and from one Condylostoma species were sequenced. Phylogenetic analysis indicates Chattonidium belongs to the class Heterotrichea defined according to the modern taxonomy, and confirms its relatedness with Condylostoma already hypothesized by Villeneuve-Brachon (1940). The presence of the aboral cavity complex, a unique feature never described in other ciliates, and its peculiar organization revealed by ultrastructural analysis fully justify, in our opinion, the maintenance of Chattonidium in the separate family Chattonidiidae, established by Villeneuve-Brachon in 1940.

    (Edited by Masanori OTSUKA, M.J.A.)
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