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RISS 인기검색어
- 검색키워드
- 저자 : Imer, Derya Yü (검색결과 2 건)
- 무료
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Yavuztü,rk Gü,l, Bahar,Imer, Derya Yü,ksel,Park, Pyung-Kyu,Koyuncu, Ismail IWA Publishing 2018 Water Science & Technology Vol.77 No.4
<P>The effects of a newly isolated quorum quenching (QQ) bacteria (<I>Bacillus</I> sp. T5) on the microbial community has been evaluated via the Illumina sequencing method. Membrane bioreactors (MBRs) operated with this novel QQ bacterium to evaluate the improvement in the performance of MBR. Anti-biofouling effect of T5 was enhanced as 71% compared to the control reactor. Also, QQ bacteria did not have any negative effect on the removal of organics during the process. Gram-negative bacteria were found to be dominant over Gram-positive bacteria. <I>Proteobacteria</I>, <I>Actinobacteria, Bacteroidetes, Acidobacteria, Firmicutes,</I> and <I>Chloroflexi</I> were dominant phyla in the control and QQ reactors. The proportion of <I>Alphaproteobacteria</I> was most significant among <I>Proteobacteria</I>. The relative abundances of <I>Actinobacteri</I>a, <I>Acidobacteria</I>, and <I>Firmicutes</I> were significantly affected by Quorum quenching mechanism. On the other hand, QQ activity of <I>Bacillus</I> sp. T5 significantly influenced the relative abundance of <I>Proteobacteria</I>, <I>Bacteroidetes</I>, and <I>Chloroflexi</I>. The QQ process appeared to generate variations in the structure of the microbial community. According to the results of the molecular analyses, the syntrophic interaction of <I>Bacillus</I> sp. T5 and indigenous Gram-negative and Gram-positive bacterial community is critical to the performance of MBRs.</P>
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Gü,l, Bahar Yavuztü,rk,Imer, Derya Yü,ksel,Park, Pyung-Kyu,Koyuncu, Ismail IWA Publishing 2018 Water Science & Technology Vol.78 No.2
<P>This study aimed to address the gap in understanding how the microbial community present within quorum quenching-membrane bioreactor (QQ-MBRs) changes during the operations by investigating the behavior of two different types of QQ bacteria, <I>Bacillus</I> sp. T5 and <I>Delftia</I> sp. T6. The anti-biofouling effects of T5 and T6 in the QQ-MBR were 85% and 76%, respectively. According to the Illumina HiSeq results, when the QQ-MBR was operated with Gram-positive bacteria, T5, in the mixed liquor a reduction was observed in Gram-positive bacteria and Gram-negative bacteria population increased. In contrast, when the QQ-MBR was operated with Gram-negative bacteria, T6, Gram-negative bacteria population reduced and an increase in Gram-positive bacteria observed. As such, the outputs of the Illumina analysis revealed that use of Gram-negative QQ bacteria in the reactor induced a Gram-positive microbial community and vice versa. This indicates that a close interaction occurs between indigenous Gram-negative and positive bacterial phyla, and <I>Bacillus</I> sp. T5/<I>Delftia</I> sp. T6 is fundamental to the performance of MBRs. This is the first study demonstrating such a relationship and assistance selecting QQ bacteria/strategy in an effective way.</P>
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