Radiocesium Concentrations in Wild Mushrooms and Characteristics of Cesium Accumulation by the Edible Mushroom (Pleurotus ostreatus)
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概要
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Mushrooms collected from a sub-alpine forest of Mt. Fuji and some other locations in Japan in 1996 were analyzed for radiocesium. The ^<137>Cs concentrations in 37 mushrooms varied widely from 1.6 to 783 Bq kg ^<-1> fresh wt. The characteristics of Cs accumulation were analyzed by culturing fruiting bodies of the edible mushroom Pleurotus ostreatus (Fr.) Kummer Y-1 (P. ostreatus Y-1). The ^<137>Cs and stable Cs accumulation expressed as the concentration ratio (CR, ^<137>Cs or Cs concentration in the dried fruiting body / ^<137>Cs or Cs concentration in the fresh medium) were in good agreement, indicating similar migration. The CR of Cs grown on medium containing both 0.1% Cs and 0.1% K, 10.2,showed a decrease of about 30 percent as compared with that containing 0.1% Cs only. These CR values suggested that Cs accumulation by the fruiting bodies of P. ostreatus Y-1 is affected by the presence of K similarly to previous observations in the mycelia. The ^<133>Cs-NMR spectra from the fruiting bodies of P.ostreatus Y-1 showed two resonance signals, whereas those from the media after harvesting of fruiting bodies showed only one signal. Just before growth of the fruiting bodies, bunches consisting of many mycelia were observed by scanning electron microscopy (SEM). No significant differences in the elemental distribution (Cs, K, P and C) were detected in the mycelium surface by SEM equipped with an energy dispersive X-ray microanalyzer.
- 社団法人日本薬学会の論文
- 2000-10-01
著者
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杉山 英男
国立保健医療科学院
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Takami H
Subaru Telescope Naoj
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Sugiyama Hideo
National Institute of Public Health
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Terada Hiroshi
National Institute of Public Health
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Shibata Hisashi
Yamanashi Forestry and Forest Products Research Institute
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Morita Yohoji
Application Center, Horiba Co., Ltd.
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Kato Fumio
School of Pharmaceutical Sciences, Toho University
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Terada H
National Institute Of Public Health
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杉山 英男
Dep. Of Environmental Health National Inst. Of Public Health
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Kato Fumio
産業医科大学 放射線衛生
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Fumio Kato
Department Of Microbiology School Of Pharmaceutical Sciences Toho University
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Sugiyama Hidetoshi
Kanagawa Environmental Research Center
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Morita Yohoji
Application Center Horiba Co. Ltd.
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Sugiyama Hideo
Dep. Of Environmental Health National Inst. Of Public Health
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Hisashi Shibata
Yamanashi Forestry And Forest Products Research Institute
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Shibata Hisashi
Yamanashi Forest Research Institute
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Kato Fumio
School Of Pharmaceutical Sciences Toho University
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