Proceedings of the Japan Academy, Series B
Online ISSN : 1349-2896
Print ISSN : 0386-2208
ISSN-L : 0386-2208
Special Issue
Volume 66, Issue 9
Displaying 1-3 of 3 articles from this issue
  • Takehiko YAGI, Hiroto SUZUKI
    1990 Volume 66 Issue 9 Pages 167-172
    Published: 1990
    Released on J-STAGE: October 13, 2006
    JOURNAL FREE ACCESS
    Melting curve of methane was measured up to 4.8GPa and 260°C using a diamond anvil type high pressure-temperature apparatus. Pressure and temperature in the sample chamber were measured from the wavelength and the line width of the fluorescence line emitted from a ruby chip placed in the sample chamber. This melting curve provides important constraint on the evolution of the icy satellites.
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  • Katsuhiko SUZUKI, Akimasa MASUDA
    1990 Volume 66 Issue 9 Pages 173-176
    Published: 1990
    Released on J-STAGE: October 13, 2006
    JOURNAL FREE ACCESS
    When a molybdenite was dissolved and treated by the conventional chemical procedure, it was difficult to achieve the isotopic equilibrium between the 187Os radiogenically accumulated in the molybdenite and“common”Os added as a kind of internal standard, even after chemically complete decomposition. It is evident that this isotopic disequilibrium effect results in deterioration of Re-Os age for the molybdenite. A newly developed analytical technique employing a microwave digestion was found out to promote the isotopic equilibration of Os from two sources and to provide us with the ages concordant with those obtained by other geochronometers.
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  • Toshihiko SUZUE
    1990 Volume 66 Issue 9 Pages 177-181
    Published: 1990
    Released on J-STAGE: October 13, 2006
    JOURNAL FREE ACCESS
    A novel in vitro method for maintaining the physiological activities of late gestation rat fetuses was developed. The uterus with fetuses was isolated from a pregnant rat and was perfused with a physiological solution through a cannula inserted into uterine artery. With this transplacental-perfusion method, it became possible to maintain the activities of the heart and the central nervous system of late gestation rat fetuses (E14-E21) for more than 24 hours in vitro. The present method may be useful for a variety of studies on mammalian fetal development, enabling direct observation and manipulation of late gestation fetuses.
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