WEKO3
アイテム
Ecotoxicity Evaluation of urea using an experimental model ecosystem
https://repo.qst.go.jp/records/67773
https://repo.qst.go.jp/records/6777391f645ac-4852-4435-b3f5-4f8618bc86e9
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2004-04-30 | |||||
| タイトル | ||||||
| タイトル | Ecotoxicity Evaluation of urea using an experimental model ecosystem | |||||
| 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_c94f | |||||
| 資源タイプ | conference object | |||||
| 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 |
Takeda, Hiroshi
× Takeda, Hiroshi× Sugai, Kazunori× Fuma, Shoichi× Kawabata, Zenichiro× Suzuki, Akira× 武田 洋× 菅井 一憲× 府馬 正一 |
|||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Ecological toxicity of urea as nitrogen fertilization was evaluated using an experimental model ecosystem, namely microcosm. The microcosm used in this study was an aquatic microbial ecosystem consisting of flagellate algae Euglena gracilis as a producer, ciliate protozoa Tetrahymena thermophila B as a consumer, and bacterium Escherichia coli DH5 as a decomposer. The microcosm at the developing and mature stages was loaded with urea at final concentrations of 10, 50, 100, 500 mM. The effects observed at the developing stage were different from those at the mature stage. With the addition of urea at 500 mM, all species in the microcosm at the developing stage died out and their coexisting system was disrupted, but the microcosm system at the mature stage was sustainable. Some effects observed in the microcosm were also different from those observed in the pure culture system, in which urea was more significantly hazardous to Tetrahymena and Euglena. Thus, the effects of urea on the three species varied according to the conditions of their cultivation. This result indicates that community-level effects could not be evaluated from the effects investigated in the pure-culture system and should be used model ecosystems such as microcosm. | |||||
| 会議概要（会議名, 開催地, 会期, 主催者等） | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | SETAC Europe 14th Annual Meeting | |||||
| 発表年月日 | ||||||
| 日付 | 2004-04-22 | |||||
| 日付タイプ | Issued | |||||
