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Xiaoguo Chen
School of Resource and Enviro1nmental Engineering, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, China.

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Journal article
Published: 13 May 2019 in Toxins
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The mlr-dependent biodegradation plays an essential role in the natural attenuation of microcystins (MCs) in eutrophic freshwater ecosystems. However, their evolutionary origin is still unclear due to the lack of mlr gene cluster sequences. In this study, a Sphingopyxis sp. strain X20 with high MC-degrading ability was isolated, and the mlrA gene activity was verified by heterologous expression. The whole sequence of the mlr gene cluster in strain X20 was obtained through PCR and thermal asymmetric interlaced (TAIL)-PCR, and then used for evolutionary origin analyses together with the sequences available in GenBank. Phylogenetic analyses of mlr gene clusters suggested that the four mlr genes had the same origin and evolutionary history. Genomic island analyses showed that there is a genomic island on the genome of sphingomonads that is capable of degrading MCs, on which the mlr gene cluster anchors. The concentrated distribution of the mlr gene cluster in sphingomonads implied that these genes have likely been present in the sphingomonads gene pool for a considerable time. Therefore, the mlr gene cluster may have initially entered into the genome of sphingomonads together with the genomic island by a horizontal gene transfer event, and then become inherited by some sphingomonads. The species other than sphingomonads have likely acquired mlr genes from sphingomonads by recently horizontal gene transfer due to the sporadic distribution of MC-degrading species and the mlr genes in them. Our results shed new light on the evolutionary origin of the mlr cluster and thus facilitate the interpretation of characteristic distribution of the mlr gene in bacteria and the understanding of whole mlr pathway.

ACS Style

Lian Qin; Xiaoxing Zhang; Xiaoguo Chen; Ke Wang; Yitian Shen; Dan Li. Isolation of a Novel Microcystin-Degrading Bacterium and the Evolutionary Origin of mlr Gene Cluster. Toxins 2019, 11, 269 .

AMA Style

Lian Qin, Xiaoxing Zhang, Xiaoguo Chen, Ke Wang, Yitian Shen, Dan Li. Isolation of a Novel Microcystin-Degrading Bacterium and the Evolutionary Origin of mlr Gene Cluster. Toxins. 2019; 11 (5):269.

Chicago/Turabian Style

Lian Qin; Xiaoxing Zhang; Xiaoguo Chen; Ke Wang; Yitian Shen; Dan Li. 2019. "Isolation of a Novel Microcystin-Degrading Bacterium and the Evolutionary Origin of mlr Gene Cluster." Toxins 11, no. 5: 269.

Journal article
Published: 01 July 2017 in Bioresource Technology
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The granulation of activated sludge and effect of granular activated carbon (GAC) was investigated under the alternative anaerobic and aerobic conditions. The results showed that GAC accelerated the granulation, but had no obvious effect on the bacterial community structure of granules. The whole granulation process could be categorized into three phases, i.e. lag, granulation and granule maturation phase. During lag period GAC provided nuclei for sludge to attach, and thus enhanced the morphological regularization of sludge. During granulation period the granule size increased significantly due to the growth of bacteria in granules. GAC reduced the compression caused by the inter-particle collisions and thus accelerate the granulation. GAC has no negative effect on the performance of SBR, and thus efficient simultaneous removal of COD, nitrogen and phosphorus were obtained during most of the operating time.

ACS Style

Jia Tao; Lian Qin; Xiaoying Liu; Bolin Li; Junnan Chen; Juan You; Yitian Shen; Xiaoguo Chen. Effect of granular activated carbon on the aerobic granulation of sludge and its mechanism. Bioresource Technology 2017, 236, 60 -67.

AMA Style

Jia Tao, Lian Qin, Xiaoying Liu, Bolin Li, Junnan Chen, Juan You, Yitian Shen, Xiaoguo Chen. Effect of granular activated carbon on the aerobic granulation of sludge and its mechanism. Bioresource Technology. 2017; 236 ():60-67.

Chicago/Turabian Style

Jia Tao; Lian Qin; Xiaoying Liu; Bolin Li; Junnan Chen; Juan You; Yitian Shen; Xiaoguo Chen. 2017. "Effect of granular activated carbon on the aerobic granulation of sludge and its mechanism." Bioresource Technology 236, no. : 60-67.

Journal article
Published: 01 January 2014 in Huan jing ke xue= Huanjing kexue
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ACS Style

Di-Jie You; Xiao-Guo Chen; Hui-Yi Xiang; Liao Ouyang; Bing Yang. [Isolation, identification and characterization of a microcystin-degrading bacterium Paucibacter sp. strain CH]. Huan jing ke xue= Huanjing kexue 2014, 35, 1 .

AMA Style

Di-Jie You, Xiao-Guo Chen, Hui-Yi Xiang, Liao Ouyang, Bing Yang. [Isolation, identification and characterization of a microcystin-degrading bacterium Paucibacter sp. strain CH]. Huan jing ke xue= Huanjing kexue. 2014; 35 (1):1.

Chicago/Turabian Style

Di-Jie You; Xiao-Guo Chen; Hui-Yi Xiang; Liao Ouyang; Bing Yang. 2014. "[Isolation, identification and characterization of a microcystin-degrading bacterium Paucibacter sp. strain CH]." Huan jing ke xue= Huanjing kexue 35, no. 1: 1.

Journal article
Published: 30 December 2013 in Toxins
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During toxic Microcystis aeruginosa blooms, large amounts of cells can enter sediment through natural settlement, and coagulation treatment used to control water blooms can enhance the accumulation of cells. However, the current understanding of the fates of these cells and associated microcystins (MCs), as well as the effect of coagulation treatment on these factors, is limited. The results of the present study show that Microcystis aeruginosa cells in sediment were steadily decomposed under experimental conditions, and that they completely disappeared within 28 days. The major MCs released from settled cells were immediately degraded in sediment, and microbial degradation may be the main mechanism involved in this process. Coagulation treatment with PAC (polyaluminium chloride) + sepiolite can efficiently remove Microcystis aeruginosa cells from the water column and prevent their re-invasion. Furthermore, coagulation treatment with PAC + sepiolite had no significant effect on the release and decomposition of MCs and, thus, will not enhance the MCs pollution. However, coagulation treatment can accelerate the nutrient cycle by enhancing the settlement of cells. More attention should be paid to the effect on nutrient cycle when coagulation treatment is used for restoration of aquatic ecosystems.

ACS Style

Xiaoguo Chen; Huiyi Xiang; Yue Hu; Yang Zhang; Liao Ouyang; Meiying Gao. Fates of Microcystis aeruginosa Cells and Associated Microcystins in Sediment and the Effect of Coagulation Process on Them. Toxins 2013, 6, 152 -167.

AMA Style

Xiaoguo Chen, Huiyi Xiang, Yue Hu, Yang Zhang, Liao Ouyang, Meiying Gao. Fates of Microcystis aeruginosa Cells and Associated Microcystins in Sediment and the Effect of Coagulation Process on Them. Toxins. 2013; 6 (1):152-167.

Chicago/Turabian Style

Xiaoguo Chen; Huiyi Xiang; Yue Hu; Yang Zhang; Liao Ouyang; Meiying Gao. 2013. "Fates of Microcystis aeruginosa Cells and Associated Microcystins in Sediment and the Effect of Coagulation Process on Them." Toxins 6, no. 1: 152-167.