Online ISSN : 1884-4111
Print ISSN : 0033-8303
ISSN-L : 0033-8303
Volume 67 , Issue 5
Showing 1-4 articles out of 4 articles from the selected issue
Technical Report
Materials (Data)
  • Sadaaki Miyake, Terumitsu Yoshida, Norio Nagashima, Toshiki Yamazaki, ...
    2018 Volume 67 Issue 5 Pages 225-232
    Published: May 15, 2018
    Released: May 15, 2018

    Activity concentrations in pond water, soil and biota samples, collected at the ecology field in Saitama prefecture during the period of 2011 to 2013, were measured by γ-ray spectrometry. In all samples collected at the ecology field, Fukushima Dai-ichi Nuclear Power Plant derived 134Cs and 137Cs, and natural 40K were detected. The concentrations of 134Cs and 137Cs varied widely in each sample. Moreover, 110mAg was detected in crayfish, and the concentrations of 110mAg were in the range of 0.11~1.0 Bq/kg・wet. Concentration ratios of 137Cs in soil and biota (Bq/kg) to that in pond water (Bq/kg) were about 5~5400. It was so suggested that 137Cs tended to be accumulated in these samples at the ecology field.

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Review Article
  • Yusaku Noda, Jun Furukawa
    2018 Volume 67 Issue 5 Pages 233-241
    Published: May 15, 2018
    Released: May 15, 2018

    Caesium (Cs) uptake in land plant is mainly carried out by potassium ion (K+) transport systems. Potassium ion uptake from the rhizosphere is regulated by two types of transport system, low affinity and high affinity transport systems, depending on the K+ concentration in soil solution. In both transport systems, there are several channels and transporters which mediate Cs+ transport also. In low affinity transport system, the inward-rectifying K+ and voltage-insensitive cation channels are involved in Cs+ uptake, while KUP/HAK/KT type transporters are the major Cs+ path in high affinity transport system. Within the plant body, Cs+ translocation is also mediated by outward-rectifying K+ channels. In addition to these Cs+ and K+ competitive transport systems, recent studies reported novel Cs+ transport systems without changing K+ behavior in plant. In this review, Cs+ transport systems dependent/independent to K+ transport mechanisms are introduced.

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