臺灣博碩士論文加值系統

微生物族群與群聚的生態在自然的厭氧系統中仍然留下了許多未曾探索的，例如，在複雜的厭氧系統中完全的辨識與定量所有族群的分布，並在微生物族群結構及功能(i.e.代謝活性)之間建立一連結性，這些至今仍尚未做到，並嚴重的缺乏這一方面的研究。
本論文的研究是利用傳統培養分離的方式與寡核酸探針雜交分析來探討曾文溪底泥中的硫酸還原菌。沿著曾文溪，由淡水的環境(鹽度0.0％)到海洋的環境(鹽度1.5-3.7%)選擇5個測站當作底泥採樣地點。
由Postgate的培養基從曾文溪底泥中分離出34株的硫酸還原菌利用乳酸與醋酸為生長基質。根據型態與生理生化這些菌株應該屬於Desulfovibrio與Desulfotomaculum屬的硫酸還原菌。但是經測試的結果這些菌株與Desulfovibrio與Desulfotomaculum的特徵並不完全相符，需要再利用較多其他的方法來確定這些硫酸還原菌菌株。
利用寡核酸探針探測的結果顯示，硫酸還原菌經計算高達整體生物有機體量的26%並且在乾季與濕季中呈現兩種不同的分布趨勢。在乾季中，探討Desulfobacter的探針有一增加的反應。在濕季中，探討Desulfovibrio、Desulfobulbus與Desulfobacterium的探針有一增加的反應。另一方面，在實驗期間Desulfovibrio探針的訊號一直都有被探測到。硫酸還原菌菌群結構在曾文溪底泥中於不同乾濕季節時有不同的偵測反應。將來須進一步的研究以找出這些硫酸還原菌群聚結構與所棲息環境之間的相互關係。

The ecology of microbial populations and communities in natural anaerobic systems remains largely unexplored. For example, complete identification and quantification of all contributing populations in complex anaerobic systems, which is needed to establish the link between microbial structure and function (i.e., metabolic activity), have not yet been achieved.
In this study, cultivation and oligonucleotide probe hybridization analysis were used to detect sulfate-reducing bacteria (SRB) community structures in sediments of the Tsengwen River. Along the river, from a freshwater (0.0% salinity) to an oceanic (1.5-3.7% salinity) environment, five sampling stations were chosen to collect the sediment.
34 strains of sulfate-reducing bacteria which use lactate and acetate as the substrates were isolated from these sediments. Since in this study Postgate’s medium, which was used for isolation of Desulfovibrio and Desulfotomaculum in the past was employed for isolation, these strains should belong to the genera Desulfovbirio and Desulfotomaculum. However, it is difficult to place some strains in the genera Desulfovirio or Desulfotomaculum. Other methods are needed to identify these strains.
Results with oligonucleotide probes revealed that SRB accounted for up to 26% of all organism in sediments of the Tsengwen River. Generas of SRB had two different distribution patterns in the dry season and the wet season. Signal responses from a probe designed to detect Desulfobacter sp. were higher in the dry season, while the signal responses from the probes designed to detect Desulfovibrio sp., Desulfobacter sp. and Desulfobulbus sp. were higher in the wet season. Furthermore, signal responses from a probe designed to detect Desulfovibrio sp. were detected at all experiment period. Further studies are needed to find the relationship of the SRB communities and the environments of their habitats.

目錄………………………………………………………………………i
摘要………………………………………………………………………ii
前言………………………………………………………………………1
材料與方法
實驗材料…………………………………………………………..15
實驗方法…………………………………………………………..21
結果……………………………………………………………………..42
討論……………………………………………………………………..51
參考文獻………………………………………………………………..63
附圖……………………………………………………………………..74
附表……………………………………………………………………..95

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