Base de dados : MEDLINE
Pesquisa : G02.111.071.314 [Categoria DeCS]
Referências encontradas : 250 [refinar]
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[PMID]:28278777
[Au] Autor:Lu YF; Ma LJ; Ma L; Shan B; Chang JJ
[Ad] Endereço:a School of Ecology and Environmental Science, Yunnan University , Kunming , People's Republic of China.
[Ti] Título:Improvement of start-up and nitrogen removal of the anammox process in reactors inoculated with conventional activated sludge using biofilm carrier materials.
[So] Source:Environ Technol;39(1):59-67, 2018 Jan.
[Is] ISSN:0959-3330
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The start-up of the anaerobic ammonium oxidation (anammox) process in three up-flow column reactors seeded with common mixed activated sludge and added with three materials, sponge (R1), sponge + volcanic rock (R2) and sponge + charcoal (R3), as carriers for biofilm formation were comparatively investigated in this study. The supplement of volcanic rock and charcoal could significantly shorten the start-up time of the anammox process, which primarily occurred in the activity-enhanced phase, with ammonium and nitrite removal efficiencies stabilized above 92.5% and 93.4% after an operation period of 145, 105 and 121 d for R1, R2 and R3, respectively. After the successful anammox start-up, R2 performed significantly better in TN removal (p < .05), achieving an average rate of 91.0% and 191.5 g N m d compared to R1 of 88.4% and 172.1 g N m d , and R3 of 89.9% and 180.1 g N m d in the steady running phase. The ratios of consumed [Formula: see text] and generated [Formula: see text]/consumed [Formula: see text] after anammox start-up were lower than the theoretical values, probably suggesting the simultaneous existences of anammox, denitrification as well as nitrification processes in the reactors. A reddish brown biofilm was wrapped on the carriers and morphological detection of biofilm displayed the presentations of thick and compact floc aggregates and some filamentous bacteria on the sponge, and spherical-, ovoid- and shortrod-shaped microorganisms on the volcanic rock and charcoal. Using porous material as carrier for biofilm development is an effective strategy for practical application of the anammox reactor.
[Mh] Termos MeSH primário: Biofilmes/crescimento & desenvolvimento
Nitrogênio/metabolismo
Eliminação de Resíduos Líquidos/métodos
Poluentes Químicos da Água/análise
[Mh] Termos MeSH secundário: Compostos de Amônio
Reatores Biológicos/microbiologia
Carvão Vegetal
Crescimento Quimioautotrófico
Desnitrificação
Nitrificação
Nitritos
Nitrogênio/análise
Oxirredução
Esgotos/microbiologia
Poluentes Químicos da Água/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Ammonium Compounds); 0 (Nitrites); 0 (Sewage); 0 (Water Pollutants, Chemical); 16291-96-6 (Charcoal); N762921K75 (Nitrogen)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180308
[Lr] Data última revisão:
180308
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170311
[St] Status:MEDLINE
[do] DOI:10.1080/09593330.2017.1294624


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[PMID]:29478660
[Au] Autor:Li X; Huang Y; Liu HW; Wu C; Bi W; Yuan Y; Liu X
[Ad] Endereço:School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China.
[Ti] Título:Simultaneous Fe(III) reduction and ammonia oxidation process in Anammox sludge.
[So] Source:J Environ Sci (China);64:42-50, 2018 Feb.
[Is] ISSN:1001-0742
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:In recent years, there have been a number of reports on the phenomenon in which ferric iron (Fe(III)) is reduced to ferrous iron [Fe(II)] in anaerobic environments, accompanied by simultaneous oxidation of ammonia to NO , NO , or N However, studies on the relevant reaction characteristics and mechanisms are rare. Recently, in research on the effect of Fe(III) on the activity of Anammox sludge, excess ammonia oxidization has also been found. Hence, in the present study, Fe(III) was used to serve as the electron acceptor instead of NO , and the feasibility and characteristics of Anammox coupled to Fe(III) reduction (termed Feammox) were investigated. After 160days of cultivation, the conversion rate of ammonia in the reactor was above 80%, accompanied by the production of a large amount of NO and a small amount of NO . The total nitrogen removal rate was up to 71.8%. Furthermore, quantities of Fe(II) were detected in the sludge fluorescence in situ hybridization (FISH) and denaturated gradient gel electrophoresis (DGGE) analyses further revealed that in the sludge, some Anammox bacteria were retained, and some microbes were enriched during the acclimatization process. We thus deduced that in Anammox sludge, Fe(III) reduction takes place together with ammonia oxidation to NO and NO along with the Anammox process.
[Mh] Termos MeSH primário: Amônia/química
Ferro/química
Esgotos/microbiologia
[Mh] Termos MeSH secundário: Aclimatação
Amônia/metabolismo
Respiração Celular
Crescimento Quimioautotrófico
Eletroforese em Gel de Gradiente Desnaturante
Meio Ambiente
Compostos Férricos
Hibridização in Situ Fluorescente
Ferro/metabolismo
Nitrogênio
Oxidantes
Oxirredução
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Ferric Compounds); 0 (Oxidants); 0 (Sewage); 7664-41-7 (Ammonia); E1UOL152H7 (Iron); N762921K75 (Nitrogen)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180301
[Lr] Data última revisão:
180301
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180227
[St] Status:MEDLINE


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[PMID]:29478653
[Au] Autor:Xu X; Liu G; Wang Y; Zhang Y; Wang H; Qi L; Wang H
[Ad] Endereço:School of Environment & Natural Resources, Renmin University of China, Beijing 100872, China. Electronic address: xxlruc@163.com.
[Ti] Título:Analysis of key microbial community during the start-up of anaerobic ammonium oxidation process with paddy soil as inoculated sludge.
[So] Source:J Environ Sci (China);64:317-327, 2018 Feb.
[Is] ISSN:1001-0742
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:A sequencing batch reactor (SBR)-anaerobic ammonium oxidation (anammox) system was started up with the paddy soil as inoculated sludge. The key microbial community structure in the system along with the enrichment time was investigated by using molecular biology methods (e.g., high-throughput 16S rRNA gene sequencing and quantitative PCR). Meanwhile, the influent and effluent water quality was continuously monitored during the whole start-up stage. The results showed that the microbial diversity decreased as the operation time initially and increased afterwards, and the microbial niches in the system were redistributed. The anammox bacterial community structure in the SBR-anammox system shifted during the enrichment, the most dominant anammox bacteria were CandidatusJettenia. The maximum biomass of anammox bacteria achieved 1.68×10 copies/g dry sludge during the enrichment period, and the highest removal rate of TN achieved around 75%.
[Mh] Termos MeSH primário: Amônia/química
Esgotos/microbiologia
Eliminação de Resíduos Líquidos/métodos
[Mh] Termos MeSH secundário: Anaerobiose
Bactérias/metabolismo
Crescimento Quimioautotrófico
RNA Ribossômico 16S
Esgotos/química
Solo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (RNA, Ribosomal, 16S); 0 (Sewage); 0 (Soil); 7664-41-7 (Ammonia)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180301
[Lr] Data última revisão:
180301
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180227
[St] Status:MEDLINE


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[PMID]:27775698
[Au] Autor:König S; Gros O; Heiden SE; Hinzke T; Thürmer A; Poehlein A; Meyer S; Vatin M; Mbéguié-A-Mbéguié D; Tocny J; Ponnudurai R; Daniel R; Becher D; Schweder T; Markert S
[Ad] Endereço:Department of Pharmaceutical Biotechnology, E.M.A. University of Greifswald, Institute of Pharmacy, Greifswald, Germany.
[Ti] Título:Nitrogen fixation in a chemoautotrophic lucinid symbiosis.
[So] Source:Nat Microbiol;2:16193, 2016 Oct 24.
[Is] ISSN:2058-5276
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The shallow water bivalve Codakia orbicularis lives in symbiotic association with a sulfur-oxidizing bacterium in its gills. The endosymbiont fixes CO and thus generates organic carbon compounds, which support the host's growth. To investigate the uncultured symbiont's metabolism and symbiont-host interactions in detail we conducted a proteogenomic analysis of purified bacteria. Unexpectedly, our results reveal a hitherto completely unrecognized feature of the C. orbicularis symbiont's physiology: the symbiont's genome encodes all proteins necessary for biological nitrogen fixation (diazotrophy). Expression of the respective genes under standard ambient conditions was confirmed by proteomics. Nitrogenase activity in the symbiont was also verified by enzyme activity assays. Phylogenetic analysis of the bacterial nitrogenase reductase NifH revealed the symbiont's close relationship to free-living nitrogen-fixing Proteobacteria from the seagrass sediment. The C. orbicularis symbiont, here tentatively named 'Candidatus Thiodiazotropha endolucinida', may thus not only sustain the bivalve's carbon demands. C. orbicularis may also benefit from a steady supply of fixed nitrogen from its symbiont-a scenario that is unprecedented in comparable chemoautotrophic symbioses.
[Mh] Termos MeSH primário: Bivalves/microbiologia
Crescimento Quimioautotrófico
Gammaproteobacteria/fisiologia
Fixação de Nitrogênio
Simbiose
[Mh] Termos MeSH secundário: Animais
Gammaproteobacteria/química
Gammaproteobacteria/genética
Gammaproteobacteria/metabolismo
Brânquias/microbiologia
Redes e Vias Metabólicas/genética
Nitrogenase/metabolismo
Oxirredutases/genética
Filogenia
Proteoma/análise
Análise de Sequência de DNA
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Proteome); EC 1.- (Oxidoreductases); EC 1.18.6.1 (Nitrogenase); EC 1.18.6.1 (nitrogenase reductase)
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180126
[Lr] Data última revisão:
180126
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161025
[St] Status:MEDLINE
[do] DOI:10.1038/nmicrobiol.2016.193


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[PMID]:28455336
[Au] Autor:Nordhoff M; Tominski C; Halama M; Byrne JM; Obst M; Kleindienst S; Behrens S; Kappler A
[Ad] Endereço:Geomicrobiology, Center for Applied Geosciences, University of Tuebingen, Tuebingen, Germany.
[Ti] Título:Insights into Nitrate-Reducing Fe(II) Oxidation Mechanisms through Analysis of Cell-Mineral Associations, Cell Encrustation, and Mineralogy in the Chemolithoautotrophic Enrichment Culture KS.
[So] Source:Appl Environ Microbiol;83(13), 2017 Jul 01.
[Is] ISSN:1098-5336
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Most described nitrate-reducing Fe(II)-oxidizing bacteria (NRFeOB) are mixotrophic and depend on organic cosubstrates for growth. Encrustation of cells in Fe(III) minerals has been observed for mixotrophic NRFeOB but not for autotrophic phototrophic and microaerophilic Fe(II) oxidizers. So far, little is known about cell-mineral associations in the few existing autotrophic NRFeOB. Here, we investigate whether the designated autotrophic Fe(II)-oxidizing strain (closely related to and ) or the heterotrophic nitrate reducers that are present in the autotrophic nitrate-reducing Fe(II)-oxidizing enrichment culture KS form mineral crusts during Fe(II) oxidation under autotrophic and mixotrophic conditions. In the mixed culture, we found no significant encrustation of any of the cells both during autotrophic oxidation of 8 to 10 mM Fe(II) coupled to nitrate reduction and during cultivation under mixotrophic conditions with 8 to 10 mM Fe(II), 5 mM acetate, and 4 mM nitrate, where higher numbers of heterotrophic nitrate reducers were present. Two pure cultures of heterotrophic nitrate reducers ( and ) isolated from culture KS were analyzed under mixotrophic growth conditions. We found green rust formation, no cell encrustation, and only a few mineral particles on some cell surfaces with 5 mM Fe(II) and some encrustation with 10 mM Fe(II). Our findings suggest that enzymatic, autotrophic Fe(II) oxidation coupled to nitrate reduction forms poorly crystalline Fe(III) oxyhydroxides and proceeds without cellular encrustation while indirect Fe(II) oxidation via heterotrophic nitrate-reduction-derived nitrite can lead to green rust as an intermediate mineral and significant cell encrustation. The extent of encrustation caused by indirect Fe(II) oxidation by reactive nitrogen species depends on Fe(II) concentrations and is probably negligible under environmental conditions in most habitats. Most described nitrate-reducing Fe(II)-oxidizing bacteria (NRFeOB) are mixotrophic (their growth depends on organic cosubstrates) and can become encrusted in Fe(III) minerals. Encrustation is expected to be harmful and poses a threat to cells if it also occurs under environmentally relevant conditions. Nitrite produced during heterotrophic denitrification reacts with Fe(II) abiotically and is probably the reason for encrustation in mixotrophic NRFeOB. Little is known about cell-mineral associations in autotrophic NRFeOB such as the enrichment culture KS. Here, we show that no encrustation occurs in culture KS under autotrophic and mixotrophic conditions while heterotrophic nitrate-reducing isolates from culture KS become encrusted. These findings support the hypothesis that encrustation in mixotrophic cultures is caused by the abiotic reaction of Fe(II) with nitrite and provide evidence that Fe(II) oxidation in culture KS is enzymatic. Furthermore, we show that the extent of encrustation caused by indirect Fe(II) oxidation by reactive nitrogen species depends on Fe(II) concentrations and is probably negligible in most environmental habitats.
[Mh] Termos MeSH primário: Bactérias/metabolismo
Compostos Ferrosos/metabolismo
Minerais/metabolismo
Nitratos/metabolismo
[Mh] Termos MeSH secundário: Acetatos/metabolismo
Bactérias/genética
Bactérias/crescimento & desenvolvimento
Crescimento Quimioautotrófico
Compostos Férricos/metabolismo
Nitritos/metabolismo
Oxirredução
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Acetates); 0 (Ferric Compounds); 0 (Ferrous Compounds); 0 (Minerals); 0 (Nitrates); 0 (Nitrites)
[Em] Mês de entrada:1712
[Cu] Atualização por classe:171225
[Lr] Data última revisão:
171225
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170430
[St] Status:MEDLINE


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[PMID]:28709074
[Au] Autor:Yeung T; Kwan M; Adler L; Mills TJ; Neilan BA; Conibeer G; Patterson R
[Ad] Endereço:School of Photovoltaics and Renewable Energy Engineering, University of New South Wales, Sydney, NSW 2052, Australia. Electronic address: tracey.yeung@unsw.edu.au.
[Ti] Título:Increased methane production in cyanobacteria and methanogenic microbe co-cultures.
[So] Source:Bioresour Technol;243:686-692, 2017 Nov.
[Is] ISSN:1873-2976
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:A novel light-to-bioenergy system produced 3.5 times the baseline methane output using a co-culture of cyanobacteria (Oscillatoria sp.) and a methanogenic microbial community. Analysis of micronutrients in the system during the growth phase indicated that cobalt, iron, nickel and zinc were not appreciably consumed. The stable consumption and return of macronutrients calcium and magnesium were also observed. Essential macronutrients nitrogen, in the form of nitrate, and phosphorus showed no cycling during the growth phase and were depleted at rates of 0.35mg/L/day and 0.40µg/L/day, respectively. Biofilm formation increased the resilience of biomass to bacterial degradation in an anaerobic digester, as shown by viability assays of cyanobacterial biofilms in the co-culture.
[Mh] Termos MeSH primário: Cianobactérias
Metano
[Mh] Termos MeSH secundário: Biofilmes
Crescimento Quimioautotrófico
Técnicas de Cocultura
Euryarchaeota
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
OP0UW79H66 (Methane)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171023
[Lr] Data última revisão:
171023
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170715
[St] Status:MEDLINE


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[PMID]:28629504
[Au] Autor:Sakai HD; Kurosawa N
[Ad] Endereço:Department of Science and Engineering for Sustainable Innovation, Faculty of Science and Engineering, Soka University, 1-236 Tangi-machi, Hachioji, Tokyo 192-8577, Japan.
[Ti] Título:Sulfodiicoccus acidiphilus gen. nov., sp. nov., a sulfur-inhibited thermoacidophilic archaeon belonging to the order Sulfolobales isolated from a terrestrial acidic hot spring.
[So] Source:Int J Syst Evol Microbiol;67(6):1880-1886, 2017 Jun.
[Is] ISSN:1466-5034
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:A novel thermoacidophilic archaeon, strain HS-1T, was isolated from the Hakone Ohwaku-dani hot spring in Japan. Cells of strain HS-1T in exponential phase were cocci to irregular cocci with a diameter of 0.8-1.5 µm. The strain grew within a temperature range of 50-70 °C (optimal: 65-70 °C), a pH range of pH 1.4-5.5 (optimal: pH 3.0-3.5) and a NaCl concentration range of 0-2.5 % (w/v). The novel strain grew in aerobic conditions but did not grow anaerobically. Moreover, this strain utilized various complex substrates (beef extract, casamino acids, peptone, tryptone and yeast extract) and sugars (arabinose, xylose, galactose, glucose, maltose, sucrose, raffinose and lactose) as sole carbon sources. No chemolithoautotrophic growth occurred on elemental sulfur, pyrite, K2S4O6, Na2S2O3 or FeSO4 . 7H2O; however, growth by the oxidation of hydrogen occurred weakly. The core lipids were calditoglycerocaldarchaeol (CGTE) and caldarchaeol (DGTE). The DNA G+C content of the strain was 52.0 mol%, which was remarkably higher than those of known species of the order Sulfolobales(31-46.2 %). The growth of the strain was significantly inhibited in the presence of elemental sulfur. Analyses of 16S rRNA and 23S rRNA gene sequences showed that HS-1T belonged to the order Sulfolobales; however, it was distantly related to all known species of the order Sulfolobales (less than 89 % sequence similarity). On the basis of these results, we propose the novel genus, Sulfodiicoccus, in the order Sulfolobales (in the family Sulfolobaceae). The type species of the genus is Sulfodiicoccus acidiphilus sp. nov., and the type strain of the species is HS-1T (=JCM 31740T=InaCC Ar79T).
[Mh] Termos MeSH primário: Fontes Termais/microbiologia
Filogenia
Sulfolobaceae/classificação
[Mh] Termos MeSH secundário: Crescimento Quimioautotrófico
DNA Arqueal/genética
Temperatura Alta
Japão
Lipídeos/química
RNA Ribossômico 16S/genética
RNA Ribossômico 23S/genética
Análise de Sequência de DNA
Sulfolobaceae/genética
Sulfolobaceae/isolamento & purificação
Enxofre
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (DNA, Archaeal); 0 (Lipids); 0 (RNA, Ribosomal, 16S); 0 (RNA, Ribosomal, 23S); 70FD1KFU70 (Sulfur)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170906
[Lr] Data última revisão:
170906
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170621
[St] Status:MEDLINE
[do] DOI:10.1099/ijsem.0.001881


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[PMID]:28475995
[Au] Autor:Rios-Del Toro EE; López-Lozano NE; Cervantes FJ
[Ad] Endereço:División de Ciencias Ambientales, Instituto Potosino de Investigación Científica y Tecnológica (IPICyT), Camino a la Presa San José 2055, Lomas 4ª Sección, San Luis Potosí, SLP 78216, Mexico.
[Ti] Título:Up-flow anaerobic sediment trapped (UAST) reactor as a new configuration for the enrichment of anammox bacteria from marine sediments.
[So] Source:Bioresour Technol;238:528-533, 2017 Aug.
[Is] ISSN:1873-2976
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:A novel reactor configuration for the enrichment of anammox bacteria from marine sediments was developed. Marine sediments were successfully kept inside the bioreactors during the enrichment process by strategically installing traps at different depths to prevent the wash-out of sediments. Three up-flow anaerobic sediment trapped (UAST) reactors were set up (α, ß and ω supplied with 50, 150 and 300mgCa /L, respectively). Nitrogen removal rates (NRR) of up to 3.5gN/L-d and removal efficiencies of >95% were reached. Calcium enhanced biomass production as evidenced by increased volatile suspended solids and extracellular polymeric substances. After the long-term operation, dominant families detected were Rhodobacteracea, Flavobacteracea, and Alteromonadacea, while the main anammox genera detected in the three reactors were Candidatus Kuenenia and Candidatus Anammoximicrobium. The UAST reactor is proposed as suitable technology for the enrichment of anammox bacteria applicable for the treatment of saline industrial wastewaters with high nitrogen content.
[Mh] Termos MeSH primário: Reatores Biológicos
Sedimentos Geológicos
[Mh] Termos MeSH secundário: Bactérias
Bactérias Anaeróbias
Crescimento Quimioautotrófico
Nitrogênio
Oxirredução
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
N762921K75 (Nitrogen)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171023
[Lr] Data última revisão:
171023
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170506
[St] Status:MEDLINE


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[PMID]:28372761
[Au] Autor:Zheng Z; Li J; Ma J; Du J; Wang F; Bian W; Zhang Y; Zhao B
[Ad] Endereço:The College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China. Electronic address: zhengzhaomingb@sina.com.
[Ti] Título:Inhibition factors and Kinetic model for ammonium inhibition on the anammox process of the SNAD biofilm.
[So] Source:J Environ Sci (China);53:60-67, 2017 Mar.
[Is] ISSN:1001-0742
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:The aim of the present work was to evaluate the anaerobic ammonium oxidation (anammox) activity of simultaneous partial nitrification, anammox and denitrification (SNAD) biofilm with different substrate concentrations and pH values. Kaldnes rings taken from the SNAD biofilm reactor were incubated in batch tests to determine the anammox activity. Haldane model was applied to investigate the ammonium inhibition on anammox process. As for nitrite inhibition, the NH -N removal rate of anammox process remained 87.4% of the maximum rate with the NO -N concentration of 100mg/L. Based on the results of Haldane model, no obvious difference in kinetic coefficients was observed under high or low free ammonia (FA) conditions, indicating that ammonium rather than FA was the true inhibitor for anammox process of SNAD biofilm. With the pH value of 7.0, the r , Ks and K of ammonium were 0.209kg NO -N/kg VSS/day, 9.5mg/L and 422mg/L, respectively. The suitable pH ranges for anammox process were 5.0 to 9.0. These results indicate that the SNAD biofilm performs excellent tolerance to adverse conditions.
[Mh] Termos MeSH primário: Compostos de Amônio/metabolismo
Biofilmes
[Mh] Termos MeSH secundário: Amônia
Anaerobiose
Biodegradação Ambiental
Reatores Biológicos
Crescimento Quimioautotrófico
Desnitrificação
Cinética
Modelos Teóricos
Nitrificação
Eliminação de Resíduos Líquidos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Ammonium Compounds); 7664-41-7 (Ammonia)
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170616
[Lr] Data última revisão:
170616
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170405
[St] Status:MEDLINE


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[PMID]:28335808
[Au] Autor:Wu X; Pedersen K; Edlund J; Eriksson L; Åström M; Andersson AF; Bertilsson S; Dopson M
[Ad] Endereço:Centre for Ecology and Evolution in Microbial Model Systems (EEMiS), Linnaeus University, 391 82, Kalmar, Sweden.
[Ti] Título:Potential for hydrogen-oxidizing chemolithoautotrophic and diazotrophic populations to initiate biofilm formation in oligotrophic, deep terrestrial subsurface waters.
[So] Source:Microbiome;5(1):37, 2017 Mar 23.
[Is] ISSN:2049-2618
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: Deep terrestrial biosphere waters are separated from the light-driven surface by the time required to percolate to the subsurface. Despite biofilms being the dominant form of microbial life in many natural environments, they have received little attention in the oligotrophic and anaerobic waters found in deep bedrock fractures. This study is the first to use community DNA sequencing to describe biofilm formation under in situ conditions in the deep terrestrial biosphere. RESULTS: In this study, flow cells were attached to boreholes containing either "modern marine" or "old saline" waters of different origin and degree of isolation from the light-driven surface of the earth. Using 16S rRNA gene sequencing, we showed that planktonic and attached populations were dissimilar while gene frequencies in the metagenomes suggested that hydrogen-fed, carbon dioxide- and nitrogen-fixing populations were responsible for biofilm formation across the two aquifers. Metagenome analyses further suggested that only a subset of the populations were able to attach and produce an extracellular polysaccharide matrix. Initial biofilm formation is thus likely to be mediated by a few bacterial populations which were similar to Epsilonproteobacteria, Deltaproteobacteria, Betaproteobacteria, Verrucomicrobia, and unclassified bacteria. CONCLUSIONS: Populations potentially capable of attaching to a surface and to produce extracellular polysaccharide matrix for attachment were identified in the terrestrial deep biosphere. Our results suggest that the biofilm populations were taxonomically distinct from the planktonic community and were enriched in populations with a chemolithoautotrophic and diazotrophic metabolism coupling hydrogen oxidation to energy conservation under oligotrophic conditions.
[Mh] Termos MeSH primário: Betaproteobacteria/genética
Biofilmes/classificação
Crescimento Quimioautotrófico/genética
Deltaproteobacteria/genética
Epsilonproteobacteria/genética
Fixação de Nitrogênio/genética
Verrucomicrobia/genética
[Mh] Termos MeSH secundário: Betaproteobacteria/classificação
Crescimento Quimioautotrófico/fisiologia
Deltaproteobacteria/classificação
Epsilonproteobacteria/classificação
Ambientes Extremos
Água Subterrânea/microbiologia
Hidrogênio/química
Metagenoma
Fixação de Nitrogênio/fisiologia
Oceanos e Mares
Oxirredução
Filogenia
RNA Ribossômico 16S/genética
Análise de Sequência de DNA
Verrucomicrobia/classificação
Microbiologia da Água
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (RNA, Ribosomal, 16S); 7YNJ3PO35Z (Hydrogen)
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170626
[Lr] Data última revisão:
170626
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170325
[St] Status:MEDLINE
[do] DOI:10.1186/s40168-017-0253-y



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