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Pesquisa : G05.360.340.024.340.364 [Categoria DeCS]
Referências encontradas : 25 [refinar]
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  1 / 25 MEDLINE  
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[PMID]:28651315
[Au] Autor:Zhang M; Bai SH; Tang L; Zhang Y; Teng Y; Xu Z
[Ad] Endereço:Environmental Futures Research Institute, School of Natural Sciences, Griffith University, Brisbane, Queensland, 4111, Australia; Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China. Electronic address: manyunzh
[Ti] Título:Linking potential nitrification rates, nitrogen cycling genes and soil properties after remediating the agricultural soil contaminated with heavy metal and fungicide.
[So] Source:Chemosphere;184:892-899, 2017 Oct.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Apart from the contaminant removal, the remediation of agricultural soil should also pay more attention to soil nutrient retention and biogeochemical cycling. This study aimed to evaluate changes of soil properties, potential nitrification rates (PNRs), and functional gene abundances and link their relationships after remediating co-contaminated agricultural soil with Medicago sativa L. (alfalfa) planting, alone or together with biochar application. Compared with the control (CK), alfalfa planting, alone or together with biochar application, could significantly increase soil organic matter (SOM) contents and discrepantly affect soil pH values. The PNRs of the amended treatments were significantly higher than that of the CK. Moreover, alfalfa plantings also enhanced the abundances of functional genes related to soil nitrification and denitrification, with the sole exception of nosZ gene. Stepwise regression analysis revealed that the PNRs were best described by the gene abundance ratios of AOB amoA/nifH and nirS gene abundances. Compared with the CK, alfalfa planting, alone or with biochar application, could restore nitrogen cycling in the co-contaminated agricultural soil and enhance the PNRs via decreasing contaminant bio-availabilities and increasing SOM contents and gene abundance ratios of AOB amoA/nifH.
[Mh] Termos MeSH primário: Agricultura
Recuperação e Remediação Ambiental
Fungicidas Industriais/química
Metais Pesados/química
Microbiologia do Solo
[Mh] Termos MeSH secundário: Bactérias/genética
Carvão Vegetal
Desnitrificação
Genes Microbianos
Nitrificação
Nitrogênio/química
Ciclo do Nitrogênio
Solo/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Fungicides, Industrial); 0 (Metals, Heavy); 0 (Soil); 0 (biochar); 16291-96-6 (Charcoal); N762921K75 (Nitrogen)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170628
[St] Status:MEDLINE


  2 / 25 MEDLINE  
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[PMID]:28578196
[Au] Autor:Jiao YN; Chen H; Gao RX; Zhu YG; Rensing C
[Ad] Endereço:Department of Environmental Engineering, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China.
[Ti] Título:Organic compounds stimulate horizontal transfer of antibiotic resistance genes in mixed wastewater treatment systems.
[So] Source:Chemosphere;184:53-61, 2017 Oct.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Domestic wastewater treatment plants as a reservoir of antibiotic resistance genes (ARGs) have received much attention, but the effect of dyes on the propagation of ARGs has rarely been investigated. In this study, we investigated the differences in distributions of ARGs and microbial communities using high-throughput qPCR and 16S rRNA gene sequencing, respectively, between mixed (dyeing and domestic) wastewater and domestic sewage. The relative abundance of ARGs in inflows of mixed wastewater (IW2 and IW3) was higher than that of domestic wastewater (IW1). The relative abundance of mobile genetic elements in the inflow of textile dyeing wastewater (IDW3) was 3- to 13-fold higher than that in other samples. Moreover, in IDW3, some distinct high abundance ARGs, particularly operons encoding efflux pumps (such as acrR-01, acrB-01 and acrF), were significantly correlated with Streptococcus of the Firmicutes. To explore why the abundance of ARGs was relatively high in mixed wastewater, six representative types of organic compounds in textile dyeing wastewater were used to test the effect on plasmid-based conjugative transfer from E. coli HB101 to E. coli NK5449. These six compounds all facilitated the transfer of resistance-carrying RP4 plasmid, and the highest transfer frequency (approximately 10 -10 ) was over 4- to 200-fold higher than that in the control group (approximately 10 -10 ). These results illustrated that the six common residual compounds, particularly low-dose substances in IDW3, could facilitate the dissemination of ARGs in aquatic environments. More importantly, this study revealed for the first time that dyeing contaminants influenced horizontal gene transfer (HGT) of ARGs.
[Mh] Termos MeSH primário: Resistência Microbiana a Medicamentos/genética
Genes Microbianos
Substâncias Húmicas
Eliminação de Resíduos Líquidos
Águas Residuais/microbiologia
[Mh] Termos MeSH secundário: Antibacterianos/análise
Monitoramento Ambiental
Escherichia coli/efeitos dos fármacos
Genes Bacterianos/efeitos dos fármacos
RNA Ribossômico 16S/genética
Reação em Cadeia da Polimerase em Tempo Real
Esgotos
Águas Residuais/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Anti-Bacterial Agents); 0 (Humic Substances); 0 (RNA, Ribosomal, 16S); 0 (Sewage); 0 (Waste Water)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171026
[Lr] Data última revisão:
171026
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170605
[St] Status:MEDLINE


  3 / 25 MEDLINE  
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[PMID]:28527762
[Au] Autor:Shao B; Liu Z; Zhong H; Zeng G; Liu G; Yu M; Liu Y; Yang X; Li Z; Fang Z; Zhang J; Zhao C
[Ad] Endereço:College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
[Ti] Título:Effects of rhamnolipids on microorganism characteristics and applications in composting: A review.
[So] Source:Microbiol Res;200:33-44, 2017 Jul.
[Is] ISSN:1618-0623
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Biosurfactant rhmnolipids have been applied in many fields, especially in environmental bioremediation. According to previous researches, many research groups have studied the influence of rhamnolipids on microorganism characteristics and/or its application in composting. In this review, the effects of rhamnolipids on the cell surface properties of microorganisms was discussed firstly, such as cell surface hydrophobicity (CSH), electrical, surface compounds, etc. Moreover, the deeper mechanisms were also discussed, such as the effects of rhamnolipids on the structural characteristics and functional characteristics of the cell membrane, and the effects of rhamnolipids on the related enzymes and genes. Additionally, the application of rhamnolipids in composting was discussed, which is an important way for pollutant biodegradation and resource reutilization. It is believed that rhamnolipids will play more and more important role in composting.
[Mh] Termos MeSH primário: Bactérias/efeitos dos fármacos
Fungos/efeitos dos fármacos
Glicolipídeos/farmacologia
Microbiologia do Solo
Solo/química
[Mh] Termos MeSH secundário: Bactérias/metabolismo
Biodegradação Ambiental/efeitos dos fármacos
Membrana Celular/química
Membrana Celular/efeitos dos fármacos
Membrana Celular/metabolismo
Permeabilidade da Membrana Celular/efeitos dos fármacos
Fenômenos Eletromagnéticos
Enzimas/efeitos dos fármacos
Fungos/metabolismo
Regulação da Expressão Gênica
Genes Microbianos/efeitos dos fármacos
Interações Hidrofóbicas e Hidrofílicas/efeitos dos fármacos
Fluidez de Membrana/efeitos dos fármacos
Propriedades de Superfície/efeitos dos fármacos
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW
[Nm] Nome de substância:
0 (Enzymes); 0 (Glycolipids); 0 (Soil); 0 (rhamnolipid)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170522
[St] Status:MEDLINE


  4 / 25 MEDLINE  
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[PMID]:27415416
[Au] Autor:Cheng HY; Masiello CA; Bennett GN; Silberg JJ
[Ad] Endereço:Department of Bioengineering, Rice University , 6100 Main Street, MS 142, Houston, Texas 77005, United States.
[Ti] Título:Volatile Gas Production by Methyl Halide Transferase: An In Situ Reporter Of Microbial Gene Expression In Soil.
[So] Source:Environ Sci Technol;50(16):8750-9, 2016 Aug 16.
[Is] ISSN:1520-5851
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Traditional visual reporters of gene expression have only very limited use in soils because their outputs are challenging to detect through the soil matrix. This severely restricts our ability to study time-dependent microbial gene expression in one of the Earth's largest, most complex habitats. Here we describe an approach to report on dynamic gene expression within a microbial population in a soil under natural water levels (at and below water holding capacity) via production of methyl halides using a methyl halide transferase. As a proof-of-concept application, we couple the expression of this gas reporter to the conjugative transfer of a bacterial plasmid in a soil matrix and show that gas released from the matrix displays a strong correlation with the number of transconjugant bacteria that formed. Gas reporting of gene expression will make possible dynamic studies of natural and engineered microbes within many hard-to-image environmental matrices (soils, sediments, sludge, and biomass) at sample scales exceeding those used for traditional visual reporting.
[Mh] Termos MeSH primário: Solo
Transferases
[Mh] Termos MeSH secundário: Biomassa
Genes Microbianos
Microbiologia do Solo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Soil); EC 2.- (Transferases)
[Em] Mês de entrada:1707
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160715
[St] Status:MEDLINE
[do] DOI:10.1021/acs.est.6b01415


  5 / 25 MEDLINE  
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[PMID]:26736050
[Au] Autor:Xiao KQ; Li LG; Ma LP; Zhang SY; Bao P; Zhang T; Zhu YG
[Ad] Endereço:State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 18 Shuangqing Road, Beijing, 100085, China; University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing, 100049, China.
[Ti] Título:Metagenomic analysis revealed highly diverse microbial arsenic metabolism genes in paddy soils with low-arsenic contents.
[So] Source:Environ Pollut;211:1-8, 2016 Apr.
[Is] ISSN:1873-6424
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Microbe-mediated arsenic (As) metabolism plays a critical role in global As cycle, and As metabolism involves different types of genes encoding proteins facilitating its biotransformation and transportation processes. Here, we used metagenomic analysis based on high-throughput sequencing and constructed As metabolism protein databases to analyze As metabolism genes in five paddy soils with low-As contents. The results showed that highly diverse As metabolism genes were present in these paddy soils, with varied abundances and distribution for different types and subtypes of these genes. Arsenate reduction genes (ars) dominated in all soil samples, and significant correlation existed between the abundance of arr (arsenate respiration), aio (arsenite oxidation), and arsM (arsenite methylation) genes, indicating the co-existence and close-relation of different As resistance systems of microbes in wetland environments similar to these paddy soils after long-term evolution. Among all soil parameters, pH was an important factor controlling the distribution of As metabolism gene in five paddy soils (p = 0.018). To the best of our knowledge, this is the first study using high-throughput sequencing and metagenomics approach in characterizing As metabolism genes in the five paddy soil, showing their great potential in As biotransformation, and therefore in mitigating arsenic risk to humans.
[Mh] Termos MeSH primário: Arsênico/metabolismo
Bactérias/genética
Genes Microbianos
Microbiologia do Solo
Poluentes do Solo/metabolismo
[Mh] Termos MeSH secundário: Arseniatos
Arsênico/análise
Arsenitos
Bactérias/metabolismo
Biotransformação
Genes Bacterianos
Seres Humanos
Metilação
Oryza
Solo/química
Poluentes do Solo/análise
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Arsenates); 0 (Arsenites); 0 (Soil); 0 (Soil Pollutants); N5509X556J (arsenite); N712M78A8G (Arsenic); N7CIZ75ZPN (arsenic acid)
[Em] Mês de entrada:1610
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160107
[St] Status:MEDLINE


  6 / 25 MEDLINE  
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[PMID]:26613517
[Au] Autor:Zhang M; Xu Z; Teng Y; Christie P; Wang J; Ren W; Luo Y; Li Z
[Ad] Endereço:Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; University of the Chinese Academy of Sciences, Beijing 100049, China; Environmental Futures Research Institute, School of Natural Sciences, Griffith University
[Ti] Título:Non-target effects of repeated chlorothalonil application on soil nitrogen cycling: The key functional gene study.
[So] Source:Sci Total Environ;543(Pt A):636-43, 2016 Feb 01.
[Is] ISSN:1879-1026
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:The widespread and increasing application of chlorothalonil (CTN) raises concerns about its non-target impacts, but little information is available on the effect of CTN on the key functional genes related to soil nitrogen (N) cycling, especially in the case of repeated applications. In the present study, a microcosm incubation was conducted to determine CTN residues and the impacts on the abundances of key functional genes related to N cycling after repeated CTN applications. The results demonstrated that repeated CTN applications at the recommended application rate and five times the recommended rate led to the accumulation of CTN residue in soil at concentrations of 5.59 and 78.79 mg kg(-1), respectively, by the end of incubation. Real time PCR (RT-PCR) revealed that repeated CTN applications had negative effects on the chiA and aprA gene abundances. There were significantly negative correlations between CTN residues and abundances of AOA and AOB genes. In addition, the abundances of key functional genes involved in soil denitrification were declined by repeated CTN applications with the sole exception of the nosZ gene. This study suggests that repeated CTN applications could lead to the accumulation of CTN residue and generate somewhat inconsistent and erratic effects on the abundances of key functional genes related to soil N cycling.
[Mh] Termos MeSH primário: Fungicidas Industriais/análise
Nitrilos/análise
Ciclo do Nitrogênio/efeitos dos fármacos
Microbiologia do Solo
[Mh] Termos MeSH secundário: Fungicidas Industriais/toxicidade
Genes Microbianos
Nitrilos/toxicidade
Nitrogênio/análise
Solo/química
Poluentes do Solo
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Fungicides, Industrial); 0 (Nitriles); 0 (Soil); 0 (Soil Pollutants); J718M71A7A (tetrachloroisophthalonitrile); N762921K75 (Nitrogen)
[Em] Mês de entrada:1609
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:151128
[St] Status:MEDLINE


  7 / 25 MEDLINE  
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[PMID]:26578596
[Au] Autor:Forster SC; Browne HP; Kumar N; Hunt M; Denise H; Mitchell A; Finn RD; Lawley TD
[Ad] Endereço:Host Microbiota Interactions Laboratory, Wellcome Trust Sanger Institute, Wellcome Genome Campus, Hinxton CB10 1SA, UK Centre for Innate Immunity and Infectious Diseases, Hudson Institute of Medical Research, Clayton 3168, Australia Department of Molecular and Translational Sciences, Monash Universi
[Ti] Título:HPMCD: the database of human microbial communities from metagenomic datasets and microbial reference genomes.
[So] Source:Nucleic Acids Res;44(D1):D604-9, 2016 Jan 04.
[Is] ISSN:1362-4962
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The Human Pan-Microbe Communities (HPMC) database (http://www.hpmcd.org/) provides a manually curated, searchable, metagenomic resource to facilitate investigation of human gastrointestinal microbiota. Over the past decade, the application of metagenome sequencing to elucidate the microbial composition and functional capacity present in the human microbiome has revolutionized many concepts in our basic biology. When sufficient high quality reference genomes are available, whole genome metagenomic sequencing can provide direct biological insights and high-resolution classification. The HPMC database provides species level, standardized phylogenetic classification of over 1800 human gastrointestinal metagenomic samples. This is achieved by combining a manually curated list of bacterial genomes from human faecal samples with over 21000 additional reference genomes representing bacteria, viruses, archaea and fungi with manually curated species classification and enhanced sample metadata annotation. A user-friendly, web-based interface provides the ability to search for (i) microbial groups associated with health or disease state, (ii) health or disease states and community structure associated with a microbial group, (iii) the enrichment of a microbial gene or sequence and (iv) enrichment of a functional annotation. The HPMC database enables detailed analysis of human microbial communities and supports research from basic microbiology and immunology to therapeutic development in human health and disease.
[Mh] Termos MeSH primário: Bases de Dados de Ácidos Nucleicos
Genoma Microbiano
Metagenômica
[Mh] Termos MeSH secundário: Doença
Trato Gastrointestinal/microbiologia
Trato Gastrointestinal/virologia
Genes Microbianos
Seres Humanos
Internet
Metagenômica/normas
Microbiota
Anotação de Sequência Molecular
Padrões de Referência
Análise de Sequência de DNA
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1607
[Cu] Atualização por classe:161019
[Lr] Data última revisão:
161019
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:151119
[St] Status:MEDLINE
[do] DOI:10.1093/nar/gkv1216


  8 / 25 MEDLINE  
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[PMID]:26536246
[Au] Autor:Fortunato CS; Crump BC
[Ad] Endereço:Josephine Bay Paul Center, Marine Biological Laboratory, Woods Hole, Massachusetts, United States of America.
[Ti] Título:Microbial Gene Abundance and Expression Patterns across a River to Ocean Salinity Gradient.
[So] Source:PLoS One;10(11):e0140578, 2015.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Microbial communities mediate the biogeochemical cycles that drive ecosystems, and it is important to understand how these communities are affected by changing environmental conditions, especially in complex coastal zones. As fresh and marine waters mix in estuaries and river plumes, the salinity, temperature, and nutrient gradients that are generated strongly influence bacterioplankton community structure, yet, a parallel change in functional diversity has not been described. Metagenomic and metatranscriptomic analyses were conducted on five water samples spanning the salinity gradient of the Columbia River coastal margin, including river, estuary, plume, and ocean, in August 2010. Samples were pre-filtered through 3 µm filters and collected on 0.2 µm filters, thus results were focused on changes among free-living microbial communities. Results from metagenomic 16S rRNA sequences showed taxonomically distinct bacterial communities in river, estuary, and coastal ocean. Despite the strong salinity gradient observed over sampling locations (0 to 33), the functional gene profiles in the metagenomes were very similar from river to ocean with an average similarity of 82%. The metatranscriptomes, however, had an average similarity of 31%. Although differences were few among the metagenomes, we observed a change from river to ocean in the abundance of genes encoding for catabolic pathways, osmoregulators, and metal transporters. Additionally, genes specifying both bacterial oxygenic and anoxygenic photosynthesis were abundant and expressed in the estuary and plume. Denitrification genes were found throughout the Columbia River coastal margin, and most highly expressed in the estuary. Across a river to ocean gradient, the free-living microbial community followed three different patterns of diversity: 1) the taxonomy of the community changed strongly with salinity, 2) metabolic potential was highly similar across samples, with few differences in functional gene abundance from river to ocean, and 3) gene expression was highly variable and generally was independent of changes in salinity.
[Mh] Termos MeSH primário: Organismos Aquáticos/microbiologia
Metabolismo Energético/genética
Consórcios Microbianos/genética
Consumo de Oxigênio/genética
Rios/microbiologia
Microbiologia da Água
[Mh] Termos MeSH secundário: Ecossistema
Perfilação da Expressão Gênica
Genes Microbianos
Metagenoma/genética
RNA Ribossômico 16S/genética
Salinidade
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, U.S. GOV'T, NON-P.H.S.
[Nm] Nome de substância:
0 (RNA, Ribosomal, 16S)
[Em] Mês de entrada:1606
[Cu] Atualização por classe:170220
[Lr] Data última revisão:
170220
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:151105
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0140578


  9 / 25 MEDLINE  
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[PMID]:26490729
[Au] Autor:Manoharan L; Kushwaha SK; Hedlund K; Ahrén D
[Ad] Endereço:Department of Biology, Lund University, Lund 223 62, Sweden lokeshwaran.manoharan@biol.lu.se.
[Ti] Título:Captured metagenomics: large-scale targeting of genes based on 'sequence capture' reveals functional diversity in soils.
[So] Source:DNA Res;22(6):451-60, 2015 Dec.
[Is] ISSN:1756-1663
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Microbial enzyme diversity is a key to understand many ecosystem processes. Whole metagenome sequencing (WMG) obtains information on functional genes, but it is costly and inefficient due to large amount of sequencing that is required. In this study, we have applied a captured metagenomics technique for functional genes in soil microorganisms, as an alternative to WMG. Large-scale targeting of functional genes, coding for enzymes related to organic matter degradation, was applied to two agricultural soil communities through captured metagenomics. Captured metagenomics uses custom-designed, hybridization-based oligonucleotide probes that enrich functional genes of interest in metagenomic libraries where only probe-bound DNA fragments are sequenced. The captured metagenomes were highly enriched with targeted genes while maintaining their target diversity and their taxonomic distribution correlated well with the traditional ribosomal sequencing. The captured metagenomes were highly enriched with genes related to organic matter degradation; at least five times more than similar, publicly available soil WMG projects. This target enrichment technique also preserves the functional representation of the soils, thereby facilitating comparative metagenomics projects. Here, we present the first study that applies the captured metagenomics approach in large scale, and this novel method allows deep investigations of central ecosystem processes by studying functional gene abundances.
[Mh] Termos MeSH primário: Genes Bacterianos
Genes Microbianos
Metagenoma
Microbiologia do Solo
[Mh] Termos MeSH secundário: Sequenciamento de Nucleotídeos em Larga Escala/métodos
Metagenômica/métodos
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1607
[Cu] Atualização por classe:170220
[Lr] Data última revisão:
170220
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:151023
[St] Status:MEDLINE
[do] DOI:10.1093/dnares/dsv026


  10 / 25 MEDLINE  
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[PMID]:26231124
[Au] Autor:Wang H; Ji G; Bai X
[Ad] Endereço:Key Laboratory of Water and Sediment Sciences, Ministry of Education, Department of Environmental Engineering, Peking University, Beijing 100871, China.
[Ti] Título:Enhanced long-term ammonium removal and its ranked contribution of microbial genes associated with nitrogen cycling in a lab-scale multimedia biofilter.
[So] Source:Bioresour Technol;196:57-64, 2015 Nov.
[Is] ISSN:1873-2976
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The multimedia biofilter achieved high and stable removal efficiencies for chemical oxygen demand (COD, 62-98%) and NH4(+) (68-98%) without costly aeration. Results revealed that lower CL (less than 13.9gCOD/m(3)d) and ACL (less than 2.8gNH4(+)-N/m(3)d) or a C/N ratio exceeding five was required to reduce NO3(-)-N accumulation and NO/N2O emission. Integrated analyses indicated that the coupling of simultaneous nitrification, anammox and denitrification processes (SNAD) were the primary reason accounted for the enhanced NH4(+)-N treatment performance. NH4(+)-N removal pathways can be ranked as follows: nitrification (amoA, archaeal) (54.6%)>partial denitrification (nirS, nirK) and anammox (37.8%)>anammox and partial denitrification (narG, napA) (12.6%). Specifically, NH4(+)-N removal was significantly inhibited by NO2(-)-N accumulation in the system (-21.6% inhibition). Results from stepwise regression analysis suggested that the NH4(+) removal rate was collectively controlled by amoA, archaeal, anammox, nirS, nirK, narG and napA.
[Mh] Termos MeSH primário: Compostos de Amônio/isolamento & purificação
Filtração/instrumentação
Genes Microbianos
Laboratórios
Ciclo do Nitrogênio/genética
Nitrogênio/metabolismo
[Mh] Termos MeSH secundário: Amônia/metabolismo
Anaerobiose
Archaea/genética
Archaea/metabolismo
Bactérias/genética
Bactérias/metabolismo
Biodegradação Ambiental
Análise da Demanda Biológica de Oxigênio
Biotransformação
Desnitrificação
Nitrificação
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Ammonium Compounds); 7664-41-7 (Ammonia); N762921K75 (Nitrogen)
[Em] Mês de entrada:1612
[Cu] Atualização por classe:161230
[Lr] Data última revisão:
161230
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150802
[St] Status:MEDLINE



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