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Effects of chronic gamma-irradiation on the aquatic microbial microcosm: equi-dosimetric comparison with effects of heavy metals.
https://repo.qst.go.jp/records/46229
https://repo.qst.go.jp/records/4622973070232-135e-4b1b-969d-2f8327f98dd5
| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2011-12-20 | |||||
| タイトル | ||||||
| タイトル | Effects of chronic gamma-irradiation on the aquatic microbial microcosm: equi-dosimetric comparison with effects of heavy metals. | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | journal article | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
Fuma, Shoichi
× Fuma, Shoichi× Kawaguchi, Isao× Kubota, Yoshihisa× Yoshida, Satoshi× Kawabata, Zenichiro× Polikarpov, Gennady× 府馬 正一× 川口 勇生× 久保田 善久× 吉田 聡 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Effects of chronic gamma-irradiation were investigated in the aquatic microcosm consisting of flagellate algae Euglena gracilis as producers, ciliate protozoa Tetrahymena thermophila as consumers and bacteria Escherichia coli as decomposers. At 1.1Gyday(-1), no effects were observed. At 5.1Gyday(-1), cell densities of E. coli showed a tendency to be lower than those of controls. At 9.7 and 24.7Gyday(-1), population decrease was observed in E. coli. E. gracilis and T. thermophila died out after temporal population decrease and subsequent population increase in T. thermophila. It is likely that this temporal population increase was an indirect effect due to interspecies interactions. Effect dose rates of gamma-rays were compared with effect concentrations of some metals using the radiochemoecological conceptual model and the effect index for microcosm. Comparison of these community-level effects data with environmental exposure data suggests that ionising radiation, gadolinium and dysprosium have low risks to affect aquatic microbial communities while manganese, nickel and copper have considerable risks. Effects of chronic irradiation were smaller than those of acute irradiation, and an acute to chronic ratio was calculated to be 28 by dividing an acute dose by chronic daily dose rate at which the effect index was 10%. This ratio would be useful for community-level extrapolation from acute to chronic radiation effects. | |||||
| 書誌情報 |
Journal of Environmental Radioactivity 巻 104, p. 81-86, 発行日 2012-02 |
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| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 0265-931X | |||||
