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Volume 56, Issue 10
Displaying 1-9 of 9 articles from this issue
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Kiyoshi TAMURA, Hiroshi IMAIZUMI, Naoki KANO2007 Volume 56 Issue 10 Pages 593-603
Published: October 15, 2007
Released on J-STAGE: March 01, 2011
JOURNAL FREE ACCESSIn order to quantitatively evaluate the influence of tritium (3H or T) on various functional groups in environment, the hydrogen isotope exchange reaction (T for-H exchange reaction) between tritium-labeled poly (vinyl alcohol) and each aliphatic cyclic alcohol (or carboxylic acid) has been dynamically observed in the range of 50 to 90°C. Consequently, the activities of the aliphatic cyclic alcohol and carboxylic acid increased with increasing reaction time. Applying the A″-McKay plot method to the observed data, the rate constants (k) for these materials were obtained. Using the k, the relation between the number of carbon atoms in the ring in each alcohol and the reactivity of the alcohol was quantitatively compared. Then, to clarify the effect of relative atomic charge of O atom (connected with the H atom in the hydroxy (or carboxy) group in the material) on the reactivity of the material, the MOPAC method was used.
From both the above-mentioned and the obtained previously, the following nine items were found as to aliphatic cyclic alcohols (and carboxylic acids) in the T-for-H exchange reaction. (1) The reactivity of aliphatic cyclic alcohols (and carboxylic acids) depends on the temperature. (2) The reactivity of the cyclic materials decreases with increasing number of carbon atoms in the ring. (3) The reactivity of the aliphatic cyclic carboxylic acid seems to be smaller than that of aliphatic cyclic alcohol, and be larger than that of aliphatic cyclic amine. (4) For aliphatic cyclic alcohols, correlation exists between k and relative atomic charges of O atom obtained by the MOPAC method, but the tendency for aliphatic cyclic carboxylic acid is not clear. (5) As to having the same number of carbon atoms in each ring, the reactivity of the aliphatic cyclic carboxylic acid including the side chain is smaller than of the aliphatic cyclic carboxylic acid including no side chain. (6) The reactivity of aliphatic cyclic carboxylic acid is larger than that of aliphatic normal carboxylic acid. (7) The reactivity of these materials dissolved in 1, 4-dioxane is smaller than that in p-xylene. (8) Using both the MOPAC and the A″-McKay plot methods, the actual analysis of aliphatic cyclic alcohols can be more possible. (9) The method used in this work is useful for evaluating influence of T on environment.View full abstractDownload PDF (1033K) -
Masahiro KAJIWARA, Hiroshi HANAMITSU, Masayuki NAKAMURA, Mina KOTAKA, ...2007 Volume 56 Issue 10 Pages 605-612
Published: October 15, 2007
Released on J-STAGE: March 01, 2011
JOURNAL FREE ACCESSCulture broth of the photosynthetic bacterium Rhodobacter sphaeroides shows a strong red fluorescence. After esterification, two red-fluorescent compounds were isolated and identified as uroporphyrin I octamethylester (minor) and coproporphyrin III tetramethylester (major) by FAB-MS, 1H-NMR and 13C-NMR. Feeding experiments using [2-13C] glycine indicated that, although the Shemin pathway was the main biosynthetic pathway, the coproporphyrin was enriched at all porphyrin carbons. Therefore, [2-13C] glycine appeared to have been incorporated into all porphyrin carbons via TCA cycle under anaerobic conditions.View full abstractDownload PDF (778K) -
Yoshihiro OGAWA, Ryohei ARAKI2007 Volume 56 Issue 10 Pages 613-620
Published: October 15, 2007
Released on J-STAGE: March 01, 2011
JOURNAL FREE ACCESSA new Web application for adjusting data measured by a neutron spectrometer with moderators and evaluating the neutron energy spectrum and the neutron dose has been developed. The application was constructed using Sun Java Studio Creator, which is an integrated development environment associated with not only a database server but also an application server and is based on the JavaServer Faces framework. Consequently, even novice users who have little experience of using adjustment codes can simply obtain the neutron energy spectrum and the neutron dose using the easy-to-use interface. Moreover, because it employs the same user interface, the application is expected to be used as an evaluation tool for comparing the adjustment algorithm, the initial neutron energy spectrum dependence on the neutron energy spectrum and the conversion factor dependence on the neutron dose.View full abstractDownload PDF (836K) -
Kimiaki SAITO2007 Volume 56 Issue 10 Pages 621-624
Published: October 15, 2007
Released on J-STAGE: July 21, 2010
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Sakae KINASE2007 Volume 56 Issue 10 Pages 625-628
Published: October 15, 2007
Released on J-STAGE: July 21, 2010
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Koji NAKADA, Naruo KAWASAKI, Tomoko NAKAYOSHI, Nobuyoshi HANYU, Hideyu ...2007 Volume 56 Issue 10 Pages 629-636
Published: October 15, 2007
Released on J-STAGE: July 21, 2010
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Subcommittee for Radioisotope in vitro Test2007 Volume 56 Issue 10 Pages 637-686
Published: October 15, 2007
Released on J-STAGE: December 16, 2010
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Hisao KOBAYASHI2007 Volume 56 Issue 10 Pages 687-697
Published: October 15, 2007
Released on J-STAGE: July 21, 2010
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Nobuyuki TAKENAKA, Ryo YASUDA, Yasushi SAITO, Masatoshi KURETA2007 Volume 56 Issue 10 Pages 699-707
Published: October 15, 2007
Released on J-STAGE: July 21, 2010
JOURNAL FREE ACCESSDownload PDF (10240K)
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