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[PMID]: 28968514 [Au] Autor: Huang Y; Li P; Chen G; Peng L; Chen X [Ad] Endereço: Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration, School of Ecological and Environmental Sciences, East China Normal University, No.500 Dong Chuan Road, Shanghai 200241, PR China. [Ti] Título: The production of cyanobacterial carbon under nitrogen-limited cultivation and its potential for nitrate removal. [So] Source: Chemosphere;190:1-8, 2018 Jan. [Is] ISSN: 1879-1298 [Cp] País de publicação: England [La] Idioma: eng [Ab] Resumo: Harmful cyanobacterial blooms (CyanoHABs) represent a serious threat to aquatic ecosystems. A beneficial use for these harmful microorganisms would be a promising resolution of this urgent issue. This study applied a simple method, nitrogen limitation, to cultivate cyanobacteria aimed at producing cyanobacterial carbon for denitrification. Under nitrogen-limited conditions, the common cyanobacterium, Microcystis, efficiently used nitrate, and had a higher intracellular C/N ratio. More importantly, organic carbons easily leached from its dry powder; these leachates were biodegradable and contained a larger amount of dissolved organic carbon (DOC) and carbohydrates, but a smaller amount of dissolved total nitrogen (DTN) and proteins. When applied to an anoxic system with a sediment-water interface, a significant increase of the specific NO -N removal rate was observed that was 14.2 times greater than that of the control. This study first suggests that nitrogen-limited cultivation is an efficient way to induce organic and carbohydrate accumulation in cyanobacteria, as well as a high C/N ratio, and that these cyanobacteria can act as a promising carbon source for denitrification. The results indicate that application as a carbon source is not only a new way to utilize cyanobacteria, but it also contributes to nitrogen removal in aquatic ecosystems, further limiting the proliferation of CyanoHABs. [Mh] Termos MeSH primário: Biodegradação Ambiental Carbono/metabolismo Cianobactérias/metabolismo Desnitrificação Nitratos/isolamento & purificação Nitrogênio/deficiência [Mh] Termos MeSH secundário: Ecossistema Microcystis/metabolismo [Pt] Tipo de publicação: JOURNAL ARTICLE [Nm] Nome de substância: 0 (Nitrates); 7440-44-0 (Carbon); N762921K75 (Nitrogen) [Em] Mês de entrada: 1803 [Cu] Atualização por classe: 180305 [Lr] Data última revisão: 180305 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 171003 [St] Status: MEDLINE

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[PMID]: 29406099 [Au] Autor: Lin JL; Hua LC; Hung SK; Huang C [Ad] Endereço: Department of Environmental Engineering, Chung Yuan Christian University, Taoyuan, Chinese Taipei. Electronic address: jrlin@cycu.edu.tw. [Ti] Título: Algal removal from cyanobacteria-rich waters by preoxidation-assisted coagulation-flotation: Effect of algogenic organic matter release on algal removal and trihalomethane formation. [So] Source: J Environ Sci (China);63:147-155, 2018 Jan. [Is] ISSN: 1001-0742 [Cp] País de publicação: Netherlands [La] Idioma: eng [Ab] Resumo: The cyanobacteria-bloom in raw waters frequently causes an unpredictable chemical dosing of preoxidation and coagulation for an effective removal of algal cells in water treatment plants. This study investigated the effects of preoxidation with NaOCl and ClO on the coagulation-flotation effectiveness in the removal of two commonly blooming cyanobacteria species, Microcystis aeruginosa (MA) and Cylindrospermopsis raciborskii (CR), and their corresponding trihalomethane (THM) formation potential. The results showed that dual dosing with NaOCl plus ClO was more effective in enhancing the deformation of cyanobacterial cells compared to single dosing with NaOCl, especially for CR-rich water. Both preoxidation approaches for CR-rich water effectively reduced the CR cell count with less remained dissolved organic carbon (DOC), which benefited subsequent coagulation-flotation. However, preoxidation led to an adverse release of algogenic organic matter (AOM) in the case of MA-rich water. The release of AOM resulted in a poor removal in MA cells and a large amount of THM formation after oxidation-assisted coagulation-flotation process. The reduction in THM formation potential of CR-rich waters is responsible for effective algae and DOC removal by alum coagulation. It is concluded that the species-specific characteristic of cyanobacteria and their AOM released during chlorination significantly influences the performance of coagulation-flotation for AOM removal and corresponding THM formation. [Mh] Termos MeSH primário: Cianobactérias/fisiologia Microcystis/fisiologia Trialometanos/metabolismo Eliminação de Resíduos Líquidos/métodos [Mh] Termos MeSH secundário: Microalgas/fisiologia Oxirredução Trialometanos/análise Trialometanos/química [Pt] Tipo de publicação: JOURNAL ARTICLE [Nm] Nome de substância: 0 (Trihalomethanes) [Em] Mês de entrada: 1802 [Cu] Atualização por classe: 180216 [Lr] Data última revisão: 180216 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 180207 [St] Status: MEDLINE

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[PMID]: 29112878 [Au] Autor: Liu G; Ke M; Fan X; Zhang M; Zhu Y; Lu T; Sun L; Qian H [Ad] Endereço: College of Environment, Zhejiang University of Technology, Hangzhou, 310032, PR China; Department of Food Science and Technology, Zhejiang University of Technology, Hangzhou, 310032, PR China. [Ti] Título: Reproductive and endocrine-disrupting toxicity of Microcystis aeruginosa in female zebrafish. [So] Source: Chemosphere;192:289-296, 2018 Feb. [Is] ISSN: 1879-1298 [Cp] País de publicação: England [La] Idioma: eng [Ab] Resumo: Microcystis aeruginosa, a primary species in cyanobacterial blooms, is ubiquitously distributed in water. Microcystins (MCs) purified from M. aeruginosa can exert reproductive toxicity in fish. However, the effects of M. aeruginosa at environmentally relevant levels on the reproductive and endocrine systems of zebrafish are still unknown. The present study investigated the reproductive and endocrine-disrupting toxicity of M. aeruginosa on female zebrafish (Danio rerio) by short-term exposure (96 h). After exposure, marked histological lesions in the liver or gonads, such as nuclear pyknosis and deformation, were observed, and the fertilization rate and hatchability of eggs spawned from treated females were both significantly lower than they were in females in the control group, suggesting the possibility of transgenerational effects of M. aeruginosa exposure. Moreover, M. aeruginosa exposure decreased the concentration of 17ß-estradiol (E2) and testosterone (T) in female zebrafish. Interestingly, the vtg1 transcriptional level significantly decreased in the liver, whereas plasma vitellogenin (VTG) protein levels increased. The present findings indicate that M. aeruginosa could modulate endocrine function by disrupting transcription of hypothalamic-pituitary-gonadal-liver (HPGL) axis-related genes, and impair the reproductive capacity of female zebrafish, suggesting that M. aeruginosa causes potential adverse effects on fish reproduction in Microcystis bloom-contaminated aquatic environments. [Mh] Termos MeSH primário: Sistema Endócrino/efeitos dos fármacos Microcistinas/toxicidade Microcystis/patogenicidade Reprodução/efeitos dos fármacos Peixe-Zebra/microbiologia [Mh] Termos MeSH secundário: Animais Toxinas Bacterianas/farmacologia Disruptores Endócrinos/farmacologia Estradiol/análise Estradiol/metabolismo Feminino Gônadas/efeitos dos fármacos Gônadas/metabolismo Gônadas/patologia Fígado/efeitos dos fármacos Fígado/metabolismo Fígado/patologia Microcistinas/isolamento & purificação Microcystis/metabolismo Testosterona/análise Testosterona/sangue Vitelogeninas/sangue Vitelogeninas/metabolismo Poluentes Químicos da Água/toxicidade Peixe-Zebra/metabolismo Peixe-Zebra/fisiologia Proteínas de Peixe-Zebra/análise Proteínas de Peixe-Zebra/efeitos dos fármacos Proteínas de Peixe-Zebra/genética [Pt] Tipo de publicação: JOURNAL ARTICLE [Nm] Nome de substância: 0 (Bacterial Toxins); 0 (Endocrine Disruptors); 0 (Microcystins); 0 (Vitellogenins); 0 (Water Pollutants, Chemical); 0 (Zebrafish Proteins); 3XMK78S47O (Testosterone); 4TI98Z838E (Estradiol); 77238-39-2 (microcystin) [Em] Mês de entrada: 1802 [Cu] Atualização por classe: 180212 [Lr] Data última revisão: 180212 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 171108 [St] Status: MEDLINE

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[PMID]: 29020009 [Au] Autor: Meyer KA; Davis TW; Watson SB; Denef VJ; Berry MA; Dick GJ [Ad] Endereço: Cooperative Institute for Great Lakes Research (CIGLR), University of Michigan, Ann Arbor, MI, United States of America. [Ti] Título: Genome sequences of lower Great Lakes Microcystis sp. reveal strain-specific genes that are present and expressed in western Lake Erie blooms. [So] Source: PLoS One;12(10):e0183859, 2017. [Is] ISSN: 1932-6203 [Cp] País de publicação: United States [La] Idioma: eng [Ab] Resumo: Blooms of the potentially toxic cyanobacterium Microcystis are increasing worldwide. In the Laurentian Great Lakes they pose major socioeconomic, ecological, and human health threats, particularly in western Lake Erie. However, the interpretation of "omics" data is constrained by the highly variable genome of Microcystis and the small number of reference genome sequences from strains isolated from the Great Lakes. To address this, we sequenced two Microcystis isolates from Lake Erie (Microcystis aeruginosa LE3 and M. wesenbergii LE013-01) and one from upstream Lake St. Clair (M. cf aeruginosa LSC13-02), and compared these data to the genomes of seventeen Microcystis spp. from across the globe as well as one metagenome and seven metatranscriptomes from a 2014 Lake Erie Microcystis bloom. For the publically available strains analyzed, the core genome is ~1900 genes, representing ~11% of total genes in the pan-genome and ~45% of each strain's genome. The flexible genome content was related to Microcystis subclades defined by phylogenetic analysis of both housekeeping genes and total core genes. To our knowledge this is the first evidence that the flexible genome is linked to the core genome of the Microcystis species complex. The majority of strain-specific genes were present and expressed in bloom communities in Lake Erie. Roughly 8% of these genes from the lower Great Lakes are involved in genome plasticity (rapid gain, loss, or rearrangement of genes) and resistance to foreign genetic elements (such as CRISPR-Cas systems). Intriguingly, strain-specific genes from Microcystis cultured from around the world were also present and expressed in the Lake Erie blooms, suggesting that the Microcystis pangenome is truly global. The presence and expression of flexible genes, including strain-specific genes, suggests that strain-level genomic diversity may be important in maintaining Microcystis abundance during bloom events. [Mh] Termos MeSH primário: Eutrofização Regulação Bacteriana da Expressão Gênica Genes Bacterianos Microcystis/genética [Mh] Termos MeSH secundário: Sequência de Bases Sistemas CRISPR-Cas/genética Great Lakes Region Metagenoma Microcystis/isolamento & purificação Filogenia Especificidade da Espécie [Pt] Tipo de publicação: JOURNAL ARTICLE [Em] Mês de entrada: 1710 [Cu] Atualização por classe: 171031 [Lr] Data última revisão: 171031 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 171012 [St] Status: MEDLINE [do] DOI: 10.1371/journal.pone.0183859

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[PMID]: 28873456 [Au] Autor: Stough JMA; Tang X; Krausfeldt LE; Steffen MM; Gao G; Boyer GL; Wilhelm SW [Ad] Endereço: Department of Microbiology, University of Tennessee, Knoxville, TN, United States of America. [Ti] Título: Molecular prediction of lytic vs lysogenic states for Microcystis phage: Metatranscriptomic evidence of lysogeny during large bloom events. [So] Source: PLoS One;12(9):e0184146, 2017. [Is] ISSN: 1932-6203 [Cp] País de publicação: United States [La] Idioma: eng [Ab] Resumo: Microcystis aeruginosa is a freshwater bloom-forming cyanobacterium capable of producing the potent hepatotoxin, microcystin. Despite increased interest in this organism, little is known about the viruses that infect it and drive nutrient mobilization and transfer of genetic material between organisms. The genomic complement of sequenced phage suggests these viruses are capable of integrating into the host genome, though this activity has not been observed in the laboratory. While analyzing RNA-sequence data obtained from Microcystis blooms in Lake Tai (Taihu, China), we observed that a series of lysogeny-associated genes were highly expressed when genes involved in lytic infection were down-regulated. This pattern was consistent, though not always statistically significant, across multiple spatial and temporally distinct samples. For example, samples from Lake Tai (2014) showed a predominance of lytic virus activity from late July through October, while genes associated with lysogeny were strongly expressed in the early months (June-July) and toward the end of bloom season (October). Analyses of whole phage genome expression shows that transcription patterns are shared across sampling locations and that genes consistently clustered by co-expression into lytic and lysogenic groups. Expression of lytic-cycle associated genes was positively correlated to total dissolved nitrogen, ammonium concentration, and salinity. Lysogeny-associated gene expression was positively correlated with pH and total dissolved phosphorous. Our results suggest that lysogeny may be prevalent in Microcystis blooms and support the hypothesis that environmental conditions drive switching between temperate and lytic life cycles during bloom proliferation. [Mh] Termos MeSH primário: Bacteriófagos/genética Eutrofização Lisogenia/genética Microcystis/virologia Transcriptoma/genética [Mh] Termos MeSH secundário: Meio Ambiente Perfilação da Expressão Gênica Regulação Viral da Expressão Gênica Genoma Viral Filogenia [Pt] Tipo de publicação: JOURNAL ARTICLE [Em] Mês de entrada: 1710 [Cu] Atualização por classe: 171016 [Lr] Data última revisão: 171016 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 170906 [St] Status: MEDLINE [do] DOI: 10.1371/journal.pone.0184146

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[PMID]: 28859113 [Au] Autor: Guellati FZ; Touati H; Tambosco K; Quiblier C; Humbert JF; Bensouilah M [Ad] Endereço: Ecobiologie des milieux marins et litoraux; Faculté des sciences, BP 12 El- Hadjar, University Badji Mokhtar, Annaba, Algerie. [Ti] Título: Unusual cohabitation and competition between Planktothrix rubescens and Microcystis sp. (cyanobacteria) in a subtropical reservoir (Hammam Debagh) located in Algeria. [So] Source: PLoS One;12(8):e0183540, 2017. [Is] ISSN: 1932-6203 [Cp] País de publicação: United States [La] Idioma: eng [Ab] Resumo: Succession in bloom-forming cyanobacteria belonging to distant functional groups in freshwater ecosystems is currently an undescribed phenomenon. However in the Hammam Debagh reservoir (Algeria), P. rubescens and Microcystis sp. co-occur and sometimes proliferate. With the aim of identifying the main factors and processes involved in this unusual cohabitation, water samples were collected monthly from February 2013 to June 2015 at the subsurface at four sampling stations and along the entire water column at one sampling station. In addition, the composition of the cyanobacterial communities was estimated by Illumina sequencing of a 16S rRNA gene fragment from samples collected over one year (October 2013-November 2014). This molecular approach showed that the Hammam Debagh reservoir displays high species richness (89 species) but very low diversity due to the high dominance of Microcystis in this community. Furthermore, it appears that Planktothrix rubescens and Microcystis sp. coexisted (from September to January) but proliferated alternately (Spring 2015 for P. rubescens and Spring 2014 and Autumn 2014/2015 for Microcystis). The main factors and processes explaining these changes in bloom-forming species seem to be related to the variation in the depth of the lake during the mixing period and to the water temperatures during the winter prior to the bloom season in spring. [Mh] Termos MeSH primário: Cianobactérias/crescimento & desenvolvimento Ecossistema Monitoramento Ambiental [Mh] Termos MeSH secundário: Argélia Cianobactérias/genética Água Doce Lagos Microcystis/genética Microcystis/crescimento & desenvolvimento Plâncton/genética Plâncton/crescimento & desenvolvimento RNA Ribossômico 16S/genética [Pt] Tipo de publicação: JOURNAL ARTICLE [Nm] Nome de substância: 0 (RNA, Ribosomal, 16S) [Em] Mês de entrada: 1710 [Cu] Atualização por classe: 171013 [Lr] Data última revisão: 171013 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 170901 [St] Status: MEDLINE [do] DOI: 10.1371/journal.pone.0183540

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[PMID]: 28829021 [Au] Autor: Chun SJ; Cui Y; Ko SR; Lee HG; Oh HM; Ahn CY [Ad] Endereço: 1​Cell Factory Research Center, Korea Research Institute of Bioscience and Biotechnology, 125 Gwahak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea 2​Department of Environmental Biotechnology, KRIBB School of Biotechnology, Korea University of Science and Technology (UST), 217 Gajeong-ro, Yuse [Ti] Título: Silanimonas algicola sp. nov., isolated from laboratory culture of a bloom-forming cyanobacterium, Microcystis. [So] Source: Int J Syst Evol Microbiol;67(9):3274-3278, 2017 Sep. [Is] ISSN: 1466-5034 [Cp] País de publicação: England [La] Idioma: eng [Ab] Resumo: A Gram-stain-negative, aerobic, rod-shaped and motile bacterium, designated M23T, was isolated from a laboratory culture of a bloom-forming cyanobacterium, Microcystis, which was isolated from a eutrophic lake in Korea. The strain grew optimally without NaCl and at 25-30 °C on R2A agar medium. Phylogenetic analysis based on 16S rRNA gene sequences positioned the novel strain among the genus Silanimonas, with the highest similarity to Silanimonas lenta DSM 16282T (98.5 %). DNA-DNA relatedness between strain M23T and the closely related species in the genus Silanimonas was <30 %. Strain M23T contained iso-C15 : 0, summed feature 3 (C16 : 1ω7c and/or C16 : 1ω6c) and iso-C16 : 0 as major fatty acids and ubiquinone-8 (Q-8) as the major quinone. Strain M23T contained diphosphatidylglycerol, phosphatidylethanolamine and phosphatidylmethylethanolamine as major polar lipids. The DNA G+C content of strain M23T was 69.6 mol%. On the basis of the genotypic, chemotaxonomic and phenotypic data, strain M23T represents a novel species in the genus Silanimonas, for which the name Silanimonas algicola sp. nov. is proposed. The type strain is M23T (=KCTC 52219T=JCM 31889T). [Mh] Termos MeSH primário: Lagos/microbiologia Microcystis Filogenia Xanthomonadaceae/classificação [Mh] Termos MeSH secundário: Técnicas de Tipagem Bacteriana Composição de Bases DNA Bacteriano/genética Eutrofização Ácidos Graxos/química Hibridização de Ácido Nucleico Fosfolipídeos/química RNA Ribossômico 16S/genética República da Coreia Análise de Sequência de DNA Ubiquinona/química Xanthomonadaceae/genética Xanthomonadaceae/isolamento & purificação [Pt] Tipo de publicação: JOURNAL ARTICLE [Nm] Nome de substância: 0 (DNA, Bacterial); 0 (Fatty Acids); 0 (Phospholipids); 0 (RNA, Ribosomal, 16S); 1339-63-5 (Ubiquinone); CQA993F7P8 (ubiquinone 8) [Em] Mês de entrada: 1709 [Cu] Atualização por classe: 170920 [Lr] Data última revisão: 170920 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 170823 [St] Status: MEDLINE [do] DOI: 10.1099/ijsem.0.002102

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[PMID]: 28820119 [Au] Autor: Lee HG; Ko SR; Lee JW; Lee CS; Ahn CY; Oh HM; Jin L [Ad] Endereço: 1​Cell factory Research Centre, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 34141, Republic of Korea. [Ti] Título: Blastomonas fulva sp. nov., aerobic photosynthetic bacteria isolated from a Microcystis culture. [So] Source: Int J Syst Evol Microbiol;67(8):3071-3076, 2017 Aug. [Is] ISSN: 1466-5034 [Cp] País de publicação: England [La] Idioma: eng [Ab] Resumo: Two Gram-stain-negative, aerobic, non-motile, non-spore-forming and rod-shaped bacteria, designated strains T2T and T5, were isolated from a culture of Microcystis from Daejeon, Republic of Korea. Comparative 16S rRNA gene sequence studies placed the new isolates in the class Alphaproteobacteria and, notably, most closely related to Blastomonasaquatica PE 4-5T, Blastomonas natatoria DSM 3183T and Blastomonas ursincola KR-99T showing 99.4 %, 98.2 % and 97.9 % 16S rRNA gene sequence similarities, respectively. The two novel strains shared 100 % similarity with each other. The cells of strains T2T and T5 formed yellow colonies on R2A agar and contained Q-10 as the only ubiquinone, sphingoglycolipid, phosphatidylethanolamine, phosphatidylcholine, and phosphatidylglycerol as major polar lipids, and C17 : 1ω6c, summed feature 8 (C18 : 1ω7c and/or C18 : 1ω6c), C17 : 1ω8c and C17 : 0 as the major fatty acids (>5 %). The DNA G+C content of the genomes was determined to be 64.2 mol% for strain T2T and 64.4 mol% for strain T5. The DNA-DNA hybridization values of strains T2T and T5 with B.aquatica PE 4-5T, B. natatoria DSM 3183T, and B. ursincola KR-99T were 19.7-42.4 %. Based on the combined genotypic and phenotypic data, we propose that strains T2T and T5 represent a novel species of the genus Blastomonas, for which the name Blastomonas fulvasp. nov. is proposed. The type strain is T2T (=KCTC 42354T=JCM 30467T). [Mh] Termos MeSH primário: Microcystis Filogenia Sphingomonadaceae/classificação [Mh] Termos MeSH secundário: Técnicas de Tipagem Bacteriana Composição de Bases DNA Bacteriano/genética Ácidos Graxos/química Hibridização de Ácido Nucleico Fosfolipídeos/química Pigmentação RNA Ribossômico 16S/genética República da Coreia Análise de Sequência de DNA Sphingomonadaceae/genética Sphingomonadaceae/isolamento & purificação Ubiquinona/química [Pt] Tipo de publicação: JOURNAL ARTICLE [Nm] Nome de substância: 0 (DNA, Bacterial); 0 (Fatty Acids); 0 (Phospholipids); 0 (RNA, Ribosomal, 16S); 1339-63-5 (Ubiquinone); I7T5V2W47R (Ubiquinone Q2) [Em] Mês de entrada: 1709 [Cu] Atualização por classe: 170915 [Lr] Data última revisão: 170915 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 170819 [St] Status: MEDLINE [do] DOI: 10.1099/ijsem.0.002084

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[PMID]: 28673519 [Au] Autor: Qin H; Zhang Z; Liu M; Wang Y; Wen X; Yan S; Zhang Y; Liu H [Ad] Endereço: Institute of Agricultural Resource and Environmental Sciences, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, PR China. Electronic address: hongjieqin111@126.com. [Ti] Título: Efficient assimilation of cyanobacterial nitrogen by water hyacinth. [So] Source: Bioresour Technol;241:1197-1200, 2017 Oct. [Is] ISSN: 1873-2976 [Cp] País de publicação: England [La] Idioma: eng [Ab] Resumo: A N labeling technique was used to study nitrogen transfer from cyanobacterium Microcystis aeruginosa to water hyacinth. N atom abundance in M. aeruginosa peaked (15.52%) after cultivation in N-labeled medium for 3weeks. Over 87% of algal nitrogen was transferred into water hyacinth after the 4-week co-cultivation period. The nitrogen quickly super-accumulated in the water hyacinth roots, and the labeled nitrogen was re-distributed to different organs (i.e., roots, stalks, and leaves). This study provides a new strategy for further research on cyanobacterial bloom control, nitrogen migration, and nitrogen cycle in eutrophic waters. [Mh] Termos MeSH primário: Cianobactérias Eichhornia Nitrogênio [Mh] Termos MeSH secundário: Eutrofização Microcystis [Pt] Tipo de publicação: JOURNAL ARTICLE [Nm] Nome de substância: N762921K75 (Nitrogen) [Em] Mês de entrada: 1711 [Cu] Atualização por classe: 171106 [Lr] Data última revisão: 171106 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 170705 [St] Status: MEDLINE

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[PMID]: 28617289 [Au] Autor: Cong H; Sun F; Wu J; Zhou Y; Yan Q; Ren A; Xu H [Ad] Endereço: School of Environmental Science and Engineering, Yangzhou University, 196 Huayang West Road, Yangzhou, Jiangsu 225127, China E-mail: chb9903@126.com; Jiujiufu Environmental Science and Technology Co., Ltd, Suzhou, Jiangsu 215316, China. [Ti] Título: Study on method and mechanism of deep well circulation for the growth control of Microcystis in aquaculture pond. [So] Source: Water Sci Technol;75(11-12):2692-2701, 2017 Jun. [Is] ISSN: 0273-1223 [Cp] País de publicação: England [La] Idioma: eng [Ab] Resumo: In order to control the growth of Microcystis in aquaculture ponds and reduce its adverse effect on water quality and aquaculture, a production-scale experiment of deep well circulation treatment was carried out in an aquaculture pond with water surface area of 63,000 m and water depth of 1.6-2.0 m. Compared with the control pond, the experiment pond had better water quality as indicated by 64.2% reduction in chlorophyll a, and 81.1% reduction in algal cells. The chemical oxygen demand, total nitrogen, and total phosphorus concentration were reduced by 55.1%, 57.5%, and 50.8%, respectively. The treatment efficiency is mainly due to the growth control of Microcystis (i.e. cell reduction of 96.4%). The gas vesicles collapsing because of the water pressure was suggested to be the mechanism for Microcystis suppression by the deep well circulation treatment. The Microcystis lost its buoyancy after gas vesicles collapsed and it settled to the bottom of the aquaculture pond. As a result, the algae reproduction was suppressed because algae could only grow in the area with enough sunlight (i.e. water depth less than 1 m). [Mh] Termos MeSH primário: Aquicultura/métodos Microcystis/crescimento & desenvolvimento Tanques/química Qualidade da Água [Pt] Tipo de publicação: JOURNAL ARTICLE [Em] Mês de entrada: 1708 [Cu] Atualização por classe: 170817 [Lr] Data última revisão: 170817 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 170616 [St] Status: MEDLINE [do] DOI: 10.2166/wst.2017.159

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3	and or and not		PalavrasDescritor de assuntoDescritor de assunto primárioLimitesAutorPalavras do títuloPalavras do resumoIdiomaPaís de publicaçãoNome de substânciaNome de pessoa como assuntoRevistaAssunto de RevistaISSNTipo de publicaçãoIdentificador únicoMês de entradaAno de publicaçãoTexto completoAtualização por classeCategoria DeCSCategoria DeCS explodidaCategoria CID-10SubSetsPais de AfiliaçãoAfiliaçãoAfiliação 2

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BIREME/OPAS/OMS - Centro Latino-Americano e do Caribe de Informação em Ciências da Saúde