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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
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dc.contributor.author | 袁又罡 | zh_TW |
dc.date.accessioned | 2021-07-01T08:15:09Z | - |
dc.date.available | 2021-07-01T08:15:09Z | - |
dc.date.issued | 1990 | |
dc.identifier.citation | Agamson, A, H., D.A. Valks, M.A. Appleton, and W.B. Shaw., 1969. Copper toxicity in housed lambs. Vet. Rrc. 85, 368.
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/75756 | - |
dc.description.abstract | 本試驗主要在探討銅對烏魚的急慢性毒性影響,以做為池塘水質管理之依據、訂立水質用水基準之參考、及利用組織切片提供污染糾紛之鑑定方法。 在急性毒性方面,25ppm高濃度銅的LT50值(使生物死亡一半所需要的時間)遠短於5ppm和10ppm銅的濃度者,而銅濃度若低於5ppm時,則在96小時內仍無致死情形發生。若將鹽度與溫度一併考慮時,則在低溫時,鹽度愈高,10至25ppm濃度的銅之致死率就愈高,即在低溫度和高鹽度下,銅濃度愈高,其LT50值就愈短。但在高溫時銅濃度愈高,鹽度不同所導致的LT50值差異就愈不顯著。 在慢性影響方面,魚苗之耗氧量會隨著銅濃度的增加而減少。但0.1ppm以下各組之變化並不大,而1.0ppm組除有明顯的改變外,更將耗氧型改成順應型。至於各試驗組的溶氧窒息濃度也由第5天時的0.4?0.6ppmO2降低為第二十天時的0.4ppmO2,可見時間愈長,魚苗對銅的適應情形就較明顯。另外,於銅溶液中蓄養的時日愈久,魚苗的攝食與成長都會受到明顯的抑制,銅濃度愈低受抑制的程度就愈低,因此生物的安全濃度應可訂在0.05?0.1ppm之間。而由急性毒試驗所得之結果,其中20?S和27℃之96小時LC50為4.5ppm,由此得到安全濃度為0.45ppm,較慢性毒試驗之結果高出4.5?9倍。在滲透壓方面,於銅溶液中蓄養的時間愈長,溶液含銅濃度愈高的話,則滲透壓亦增高,此可能與鰓之破壞有關。再者,由LSIW(Wet Liver-Somatic Index)值之改變可知,在數天內0.5ppm濃度的銅已能引起肝臟的毒害作用,但時間若增加至50天時,0.1ppm濃度的銅亦可引起肝臟的毒害影響。由本研究中亦得知,不論銅的濃度高低,基本上都會引起鰓、肝和腸細胞的損傷,而肝臟內明顯的腫瘤細胞,在1.0ppm濃度組第30天時就已出現,0.05ppm組也在第50天時出現,而細胞壞死、充血、發炎和水腫等現象更是歷歷可見。由這些現象再加上肝臟之縮小、膽囊之漲大及膽汁的顏色變化,都可做為魚類由重金屬引起毒害時鑑定原因之參考。而由累積量研究得知,肝的累積量大於鰓,而鰓的累積量又高過肌肉,經由變方分析的結果,證實銅濃度高低與組織之累積量有交互關係存在,即銅的濃度愈高,組織的銅累積量就愈高,可達180ppm。其濃縮因素?55到860多之間。 | zh_TW |
dc.description.provenance | Made available in DSpace on 2021-07-01T08:15:09Z (GMT). No. of bitstreams: 0 Previous issue date: 1990 | en |
dc.description.tableofcontents | 摘要……………………………………1 前言……………………………………3 材料與方法……………………………………6 結果……………………………………13 急性毒……………………………………13 耗氧量……………………………………14 攝食量……………………………………15 成長……………………………………16 滲透壓……………………………………17 肝重變化……………………………………18 組織變異……………………………………18 銅累積量……………………………………21 討論……………………………………23 謝辭……………………………………29 參考文獻……………………………………30 附錄……………………………………36 圖表……………………………………40 | |
dc.language.iso | zh-TW | |
dc.title | 銅對烏魚(Mugil cephalus Linnaeus)之急慢性毒性的影響 | zh_TW |
dc.date.schoolyear | 78-2 | |
dc.description.degree | 碩士 | |
dc.relation.page | 85 | |
dc.rights.note | 未授權 | |
dc.contributor.author-dept | 生命科學院 | zh_TW |
dc.contributor.author-dept | 動物學研究所 | zh_TW |
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