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[PMID]: 28968945 [Au] Autor: Amorim CL; Alves M; Castro PML; Henriques I [Ad] Endereço: Biology Department and CESAM, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal; Universidade Católica Portuguesa, CBQF - Centro de Biotecnologia e Química Fina, Laboratório Associado, Escola Superior de Biotecnologia, Rua Arquiteto Lobão Vital 172, 4200-374 Porto, Po [Ti] Título: Bacterial community dynamics within an aerobic granular sludge reactor treating wastewater loaded with pharmaceuticals. [So] Source: Ecotoxicol Environ Saf;147:905-912, 2018 Jan. [Is] ISSN: 1090-2414 [Cp] País de publicação: Netherlands [La] Idioma: eng [Ab] Resumo: Pharmaceuticals are micropollutants often present in wastewater treatment systems. In this study, the potential impact of such micropollutants on the bacterial population within aerobic granular sludge (AGS) bioreactor was investigated. The AGS bacterial community structure and composition were accessed combining DGGE fingerprinting and barcoded pyrosequencing analysis. Both revealed the existence of a dynamic bacterial community, independently of the pharmaceuticals presence. The AGS microbiome at both phylum and class levels varied over time and, after stopping pharmaceuticals feeding, the bacterial community did not return to its initial composition. Nevertheless, most of the assigned OTUs were present throughout the different operational phases. This core microbiome, represented by over 72% of the total sequences in each phase, probably played an important role in biological removal processes, avoiding their failure during the disturbance period. Quantitative-PCR revealed that pharmaceuticals load led to gradual changes on the abundance of ammonia-oxidizing bacteria (AOB), nitrite-oxidizing bacteria (NOB) and polyphosphate-accumulating organisms (PAO) but their persistence during that phase demonstrated the resilience of such bacterial groups. AGS microbiome changed over time but a core community was maintained, probably ensuring the accomplishment of the main biological removal processes. [Mh] Termos MeSH primário: Reatores Biológicos/microbiologia Microbiota/efeitos dos fármacos Preparações Farmacêuticas/análise Esgotos/microbiologia Águas Residuais/microbiologia Poluentes Químicos da Água/análise [Mh] Termos MeSH secundário: Aerobiose Microbiota/genética RNA Ribossômico 16S/genética Esgotos/química Águas Residuais/química Purificação da Água/métodos [Pt] Tipo de publicação: JOURNAL ARTICLE [Nm] Nome de substância: 0 (Pharmaceutical Preparations); 0 (RNA, Ribosomal, 16S); 0 (Sewage); 0 (Waste Water); 0 (Water Pollutants, Chemical) [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: 171004 [St] Status: MEDLINE

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[PMID]: 28942276 [Au] Autor: Wang H; Cao X; Li L; Fang Z; Li X [Ad] Endereço: School of Energy and Environment, Southeast University, Nanjing 210096, China. Electronic address: lwcq306@163.com. [Ti] Título: Augmenting atrazine and hexachlorobenzene degradation under different soil redox conditions in a bioelectrochemistry system and an analysis of the relevant microorganisms. [So] Source: Ecotoxicol Environ Saf;147:735-741, 2018 Jan. [Is] ISSN: 1090-2414 [Cp] País de publicação: Netherlands [La] Idioma: eng [Ab] Resumo: Soil microbial fuel cells (MFCs) are a sustainable technology that degrades organic pollutants while generating electricity. However, there have been no detailed studies of the mechanisms of pollutant degradation in soil MFCs. In this study, the effects of external resistance and electrode effectiveness on atrazine and hexachlorobenzene (HCB) degradation were evaluated, the performance of soil MFCs in the degradation of these pollutants under different soil redox conditions was assessed, and the associated microorganisms in the anode were investigated. With an external resistance of 20Ω, the degradation efficiencies of atrazine and HCB were 95% and 78%, respectively. The degradation efficiency, degradation rate increased with decreasing external resistance, while the half-life decreased. There were different degradation trends for different pollutants under different soil redox conditions. The fastest degradation rate of atrazine was in the upper MFC section (aerobic), whereas that of HCB was in the lower MFC section (anaerobic). The results showed that electrode effectiveness played a significant role in pollution degradation. In addition, the microbial community analysis demonstrated that Proteobacteria, especially Deltaproteobacteria involved in current generation was extremely abundant (27.49%) on soil MFC anodes, although the percentage abundances of atrazine degrading Rhodocyclaceae (8.77%), Desulfitobacterium (0.64%), and HCB degrading Desulfuromonas (0.73%), were considerably lower. The results of the study suggested that soil MFCs can enhance the degradation of atrazine and HCB, and bioelectrochemical reduction was the main mechanism for the pollutants degradation. [Mh] Termos MeSH primário: Atrazina/análise Fontes de Energia Bioelétrica/microbiologia Técnicas Eletroquímicas/métodos Hexaclorobenzeno/análise Poluentes do Solo/análise Solo/química [Mh] Termos MeSH secundário: Aerobiose Anaerobiose Biodegradação Ambiental Eletrodos Meia-Vida Cinética Oxirredução Proteobactérias/crescimento & desenvolvimento Bactérias Redutoras de Enxofre/crescimento & desenvolvimento [Pt] Tipo de publicação: JOURNAL ARTICLE [Nm] Nome de substância: 0 (Soil); 0 (Soil Pollutants); 4Z87H0LKUY (Hexachlorobenzene); QJA9M5H4IM (Atrazine) [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: 170925 [St] Status: MEDLINE

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[PMID]: 28278105 [Au] Autor: Lu H; Han T; Zhang G; Ma S; Zhang Y; Li B; Cao W [Ad] Endereço: a College of Water Resource and Civil Engineering , China Agriculture University , Beijing , People's Republic of China. [Ti] Título: Natural light-micro aerobic condition for PSB wastewater treatment: a flexible, simple, and effective resource recovery wastewater treatment process. [So] Source: Environ Technol;39(1):74-82, 2018 Jan. [Is] ISSN: 0959-3330 [Cp] País de publicação: England [La] Idioma: eng [Ab] Resumo: Photosynthetic bacteria (PSB) have two sets of metabolic pathways. They can degrade pollutants through light metabolic under light-anaerobic or oxygen metabolic pathways under dark-aerobic conditions. Both metabolisms function under natural light-microaerobic condition, which demands less energy input. This work investigated the characteristics of PSB wastewater treatment process under that condition. Results showed that PSB had very strong adaptability to chemical oxygen demand (COD) concentration; with F/M of 5.2-248.5 mg-COD/mg-biomass, the biomass increased three times and COD removal reached above 91.5%. PSB had both advantages of oxygen metabolism in COD removal and light metabolism in resource recovery under natural light-microaerobic condition. For pollutants' degradation, COD, total organic carbon, nitrogen, and phosphorus removal reached 96.2%, 91.0%, 70.5%, and 92.7%, respectively. For resource recovery, 74.2% of C in wastewater was transformed into biomass. Especially, coexistence of light and oxygen promote N recovery ratio to 70.9%, higher than with the other two conditions. Further, 93.7% of N-removed was synthesized into biomass. Finally, CO emission reduced by 62.6% compared with the traditional process. PSB wastewater treatment under this condition is energy-saving, highly effective, and environment friendly, and can achieve pollution control and resource recovery. [Mh] Termos MeSH primário: Eliminação de Resíduos Líquidos/métodos Águas Residuais/microbiologia [Mh] Termos MeSH secundário: Aerobiose Análise da Demanda Biológica de Oxigênio Luz Fósforo Fotossíntese Poluentes Químicos da Água/análise [Pt] Tipo de publicação: JOURNAL ARTICLE [Nm] Nome de substância: 0 (Waste Water); 0 (Water Pollutants, Chemical); 27YLU75U4W (Phosphorus) [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: 170310 [St] Status: MEDLINE [do] DOI: 10.1080/09593330.2017.1296027

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[PMID]: 29360449 [Au] Autor: Hua S; Liu C; Liu L; Wu D [Ad] Endereço: Department of Radiation Oncology, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China. Electronic address: huashengni0401@163.com. [Ti] Título: miR-142-3p inhibits aerobic glycolysis and cell proliferation in hepatocellular carcinoma via targeting LDHA. [So] Source: Biochem Biophys Res Commun;496(3):947-954, 2018 02 12. [Is] ISSN: 1090-2104 [Cp] País de publicação: United States [La] Idioma: eng [Ab] Resumo: Cancer cells are addictively dependent on glycolysis even in an oxygen-rich condition. However, the mechanism underlying micro (mi)RNA regulation of aerobic glycolysis in cancer cells has not been fully understood. Here, we demonstrated that the expression of miR-142-3p was lower in hepatocellular carcinoma (HCC) as compared to adjacent non-tumor samples, which was confirmed in The Cancer Genome Atlas (TCGA) HCC cohorts and Gene Expression Omnibus (GEO) datasets. Function and pathway analysis showed that miR-142-3p was most relevent with metabolism. As predicted, the overexpression of miR-142-3p inhibited aerobic glycolysis and thus proliferation of HCC cells. Mechanistically, we identified lactate dehydrogenase A (LDHA), one of the important catalyticase for aerobic glycolysis, as the target of miR-142-3p. Exogenous expression of miR-142-3p reduced the protein levels of LDHA in both SK-Hep-1 and Huh7 cells. Dual luciferase report assays showed the expression of LDHA was directly modulated by miR-142-3p. miR-142-3p-induced deduction of aerobic glycolysis and proliferation were reversed by LDHA overexpression. Taken together, these results indicate that miR-142-3p could act as a tumor suppressor in HCC by targeting LDHA, suggesting new therapeutic targets for HCC treatment. [Mh] Termos MeSH primário: Carcinoma Hepatocelular/metabolismo Proliferação Celular Regulação Neoplásica da Expressão Gênica/genética Glucose/metabolismo Lactato Desidrogenases/metabolismo Neoplasias Hepáticas/metabolismo MicroRNAs/metabolismo [Mh] Termos MeSH secundário: Aerobiose Carcinoma Hepatocelular/patologia Glicólise Seres Humanos Neoplasias Hepáticas/patologia Oxigênio/metabolismo Ligação Proteica Células Tumorais Cultivadas [Pt] Tipo de publicação: JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T [Nm] Nome de substância: 0 (MIRN142 microRNA, human); 0 (MicroRNAs); EC 1.1.- (Lactate Dehydrogenases); EC 1.1.1.28 (D-lactate dehydrogenase); IY9XDZ35W2 (Glucose); S88TT14065 (Oxygen) [Em] Mês de entrada: 1802 [Cu] Atualização por classe: 180222 [Lr] Data última revisão: 180222 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 180124 [St] Status: MEDLINE

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[PMID]: 28456518 [Au] Autor: Medina-Colorado AA; Vincent KL; Miller AL; Maxwell CA; Dawson LN; Olive T; Kozlova EV; Baum MM; Pyles RB [Ad] Endereço: Department of Pediatrics, University of Texas Medical Branch, Galveston, TX, USA. [Ti] Título: Vaginal ecosystem modeling of growth patterns of anaerobic bacteria in microaerophilic conditions. [So] Source: Anaerobe;45:10-18, 2017 Jun. [Is] ISSN: 1095-8274 [Cp] País de publicação: England [La] Idioma: eng [Ab] Resumo: The human vagina constitutes a complex ecosystem created through relationships established between host mucosa and bacterial communities. In this ecosystem, classically defined bacterial aerobes and anaerobes thrive as communities in the microaerophilic environment. Levels of CO and O present in the vaginal lumen are impacted by both the ecosystem's physiology and the behavior and health of the human host. Study of such complex relationships requires controlled and reproducible causational approaches that are not possible in the human host that, until recently, was the only place these bacterial communities thrived. To address this need we have utilized our ex vivo human vaginal mucosa culture system to support controlled, reproducible colonization by vaginal bacterial communities (VBC) collected from healthy, asymptomatic donors. Parallel vaginal epithelial cells (VEC)-VBC co-cultures were exposed to two different atmospheric conditions to study the impact of CO concentrations upon the anaerobic bacteria associated with dysbiosis and inflammation. Our data suggest that in the context of transplanted VBC, increased CO favored specific lactobacilli species defined as microaerophiles when grown as monocultures. In preliminary studies, the observed community changes also led to shifts in host VEC phenotypes with significant changes in the host transcriptome, including altered expression of select molecular transporter genes. These findings support the need for additional study of the environmental changes associated with behavior and health upon the symbiotic and adversarial relationships that are formed in microbial communities present in the human vaginal ecosystem. [Mh] Termos MeSH primário: Bactérias Aeróbias/crescimento & desenvolvimento Bactérias Anaeróbias/crescimento & desenvolvimento Técnicas Bacteriológicas/métodos Ecossistema Modelos Biológicos Vagina/microbiologia [Mh] Termos MeSH secundário: Adolescente Adulto Aerobiose Anaerobiose Dióxido de Carbono/metabolismo Feminino Seres Humanos Meia-Idade Adulto Jovem [Pt] Tipo de publicação: JOURNAL ARTICLE [Nm] Nome de substância: 142M471B3J (Carbon Dioxide) [Em] Mês de entrada: 1802 [Cu] Atualização por classe: 180219 [Lr] Data última revisão: 180219 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 170501 [St] Status: MEDLINE

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[PMID]: 27770299 [Au] Autor: Yilmaz G; Bozkurt U; Magden KA [Ad] Endereço: Department of Environmental Engineering, Faculty of Engineering, Istanbul University, Avcilar, 34320, Istanbul, Turkey. gulsum@istanbul.edu.tr. [Ti] Título: Effect of iron ions (Fe , Fe ) on the formation and structure of aerobic granular sludge. [So] Source: Biodegradation;28(1):53-68, 2017 02. [Is] ISSN: 1572-9729 [Cp] País de publicação: Netherlands [La] Idioma: eng [Ab] Resumo: Aerobic granulation is a promising technology for wastewater treatment, but problems regarding its formation and stability need to be solved. Divalent metal ions, especially Ca , Mg and Mn , have been demonstrated to play an important role in the process of aerobic granulation. Here, we studied whether iron ions can affect aerobic granulation. Granular sludge formed without iron ion addition (<0.02 mg Fe L ) was fluffy and had a finger-type structure and filamentous out-growth. The addition of iron ions to concentrations of 1 and 10 mg Fe L repressed the finger-type structure and filamentous out-growth. The results show that chemical precipitation in the granules with iron ion addition was higher than that in the granules without ferrous addition. The amount of precipitates was higher inside the granules than outside. This study demonstrates that iron ions (Fe /Fe ) increase the size and stability of aerobic granular sludge but do not affect the granulation time, which is the time that the first granular sludge is observed. The study shows that aerobic granular sludge technology can be confidently applied to actual wastewater containing a high concentration of iron compounds. [Mh] Termos MeSH primário: Ferro/farmacologia Esgotos Purificação da Água/métodos [Mh] Termos MeSH secundário: Aerobiose Biodegradação Ambiental Ferro/análise Esgotos/química Águas Residuais/análise [Pt] Tipo de publicação: JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T [Nm] Nome de substância: 0 (Sewage); 0 (Waste Water); E1UOL152H7 (Iron) [Em] Mês de entrada: 1706 [Cu] Atualização por classe: 180215 [Lr] Data última revisão: 180215 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 161023 [St] Status: MEDLINE [do] DOI: 10.1007/s10532-016-9777-2

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[PMID]: 28463234 [Au] Autor: Marchant HK; Ahmerkamp S; Lavik G; Tegetmeyer HE; Graf J; Klatt JM; Holtappels M; Walpersdorf E; Kuypers MMM [Ad] Endereço: Max Planck Institute for Marine Microbiology, Bremen, Germany. [Ti] Título: Denitrifying community in coastal sediments performs aerobic and anaerobic respiration simultaneously. [So] Source: ISME J;11(8):1799-1812, 2017 08. [Is] ISSN: 1751-7370 [Cp] País de publicação: England [La] Idioma: eng [Ab] Resumo: Nitrogen (N) input to the coastal oceans has increased considerably because of anthropogenic activities, however, concurrent increases have not occurred in open oceans. It has been suggested that benthic denitrification in sandy coastal sediments is a sink for this N. Sandy sediments are dynamic permeable environments, where electron acceptor and donor concentrations fluctuate over short temporal and spatial scales. The response of denitrifiers to these fluctuations are largely unknown, although previous observations suggest they may denitrify under aerobic conditions. We examined the response of benthic denitrification to fluctuating oxygen concentrations, finding that denitrification not only occurred at high O concentrations but was stimulated by frequent switches between oxic and anoxic conditions. Throughout a tidal cycle, in situtranscription of genes for aerobic respiration and denitrification were positively correlated within diverse bacterial classes, regardless of O concentrations, indicating that denitrification gene transcription is not strongly regulated by O in sandy sediments. This allows microbes to respond rapidly to changing environmental conditions, but also means that denitrification is utilized as an auxiliary respiration under aerobic conditions when imbalances occur in electron donor and acceptor supply. Aerobic denitrification therefore contributes significantly to N-loss in permeable sediments making the process an important sink for anthropogenic N-inputs. [Mh] Termos MeSH primário: Bactérias/classificação Desnitrificação Sedimentos Geológicos/microbiologia Consumo de Oxigênio/fisiologia [Mh] Termos MeSH secundário: Aerobiose Anaerobiose Nitrogênio/análise Oceanos e Mares [Pt] Tipo de publicação: JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T [Nm] Nome de substância: N762921K75 (Nitrogen) [Em] Mês de entrada: 1801 [Cu] Atualização por classe: 180118 [Lr] Data última revisão: 180118 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 170503 [St] Status: MEDLINE [do] DOI: 10.1038/ismej.2017.51

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[PMID]: 28585343 [Au] Autor: Yuan XJ; Wen AY; Wang J; Desta ST; Dong ZH; Shao T [Ad] Endereço: Institute of Ensiling and Processing of Grass, Nanjing Agricultural University, Nanjing, China. [Ti] Título: Effects of four short-chain fatty acids or salts on fermentation characteristics and aerobic stability of alfalfa (Medicago sativa L.) silage. [So] Source: J Sci Food Agric;98(1):328-335, 2018 Jan. [Is] ISSN: 1097-0010 [Cp] País de publicação: England [La] Idioma: eng [Ab] Resumo: BACKGROUND: The objective of the present study was to evaluate the effects of four chemicals on the fermentation quality and aerobic stability of alfalfa (Medicago sativa L.) silage. Wilted alfalfa was ensiled without additive (control), or with formic acid (FA), potassium diformate (KDF), sodium diacetate (SDA) or calcium propionate (CAP). RESULTS: After 60 days of ensiling, the pH values in FA, KDF and SDA silages were lower (P < 0.05) compared to that of control and CAP silages, and chemicals (P < 0.05) decreased butyric acid and ammonia N concentrations and populations of aerobic bacteria and yeasts compared to the control. The SDA and CAP silages had a higher (P < 0.05) lactic acid bacteria content compared to the FA and KDF silages. The SDA and CAP silages had higher (P < 0.05) acetic and propionic acid contents compared to the other silages, respectively. The ammonia N concentrations in the FA and KDF silages were lower compared to the other silages during the first 5 days of aerobic exposure, and then increased sharply to 105 and 100 g kg total N, respectively, which was higher (P < 0.05) than that of the SDA and CAP silages on day 9 of aerobic exposure. Yeasts and aerobic bacteria counts in SDA silage slowly increased and remained at lower levels compared to the other silages after 7 days of aerobic exposure. CONCLUSION: Additives prolonged the aerobic stability duration compared to the control, and the SDA and CAP silages remained stable for more than 216 h, followed by the KDF and FA silages (202 and 196 h, respectively). © 2017 Society of Chemical Industry. [Mh] Termos MeSH primário: Ácidos Graxos Voláteis/metabolismo Lactobacillus/metabolismo Medicago sativa/microbiologia Sais/metabolismo Silagem/análise [Mh] Termos MeSH secundário: Aerobiose Ácidos Graxos Voláteis/química Fermentação Medicago sativa/química Propionatos/metabolismo Silagem/microbiologia [Pt] Tipo de publicação: JOURNAL ARTICLE [Nm] Nome de substância: 0 (Fatty Acids, Volatile); 0 (Propionates); 0 (Salts); 8AI80040KW (calcium propionate); JHU490RVYR (propionic acid) [Em] Mês de entrada: 1712 [Cu] Atualização por classe: 171228 [Lr] Data última revisão: 171228 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 170607 [St] Status: MEDLINE [do] DOI: 10.1002/jsfa.8475

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[PMID]: 29176819 [Au] Autor: White RSA; McHugh PA; Glover CN; McIntosh AR [Ad] Endereço: School of Biological Sciences, University of Canterbury, Christchurch, New Zealand. [Ti] Título: Metabolism drives distribution and abundance in extremophile fish. [So] Source: PLoS One;12(11):e0187597, 2017. [Is] ISSN: 1932-6203 [Cp] País de publicação: United States [La] Idioma: eng [Ab] Resumo: Differences in population density between species of varying size are frequently attributed to metabolic rates which are assumed to scale with body size with a slope of 0.75. This assumption is often criticised on the grounds that 0.75 scaling of metabolic rate with body size is not universal and can vary significantly depending on species and life-history. However, few studies have investigated how interspecific variation in metabolic scaling relationships affects population density in different sized species. Here we predict inter-specific differences in metabolism from niche requirements, thereby allowing metabolic predictions of species distribution and abundance at fine spatial scales. Due to the differences in energetic efficiency required along harsh-benign gradients, an extremophile fish (brown mudfish, Neochanna apoda) living in harsh environments had slower metabolism, and thus higher population densities, compared to a fish species (banded kokopu, Galaxias fasciatus) in physiologically more benign habitats. Interspecific differences in the intercepts for the relationship between body and density disappeared when species mass-specific metabolic rates, rather than body sizes, were used to predict density, implying population energy use was equivalent between mudfish and kokopu. Nevertheless, despite significant interspecific differences in the slope of the metabolic scaling relationships, mudfish and kokopu had a common slope for the relationship between body size and population density. These results support underlying logic of energetic equivalence between different size species implicit in metabolic theory. However, the precise slope of metabolic scaling relationships, which is the subject of much debate, may not be a reliable indicator of population density as expected under metabolic theory. [Mh] Termos MeSH primário: Extremófilos/metabolismo Peixes/metabolismo [Mh] Termos MeSH secundário: Aerobiose Animais Metabolismo Basal Peso Corporal Modelos Biológicos Densidade Demográfica [Pt] Tipo de publicação: JOURNAL ARTICLE [Em] Mês de entrada: 1712 [Cu] Atualização por classe: 171219 [Lr] Data última revisão: 171219 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 171128 [St] Status: MEDLINE [do] DOI: 10.1371/journal.pone.0187597

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[PMID]: 28470424 [Au] Autor: Hong X; Chen Z; Zhao C; Yang S [Ad] Endereço: Department of Bioengineering and Biotechnology, Huaqiao University, No. 668 Jimei Ave, Xiamen, 361021, People's Republic of China. [Ti] Título: Nitrogen transformation under different dissolved oxygen levels by the anoxygenic phototrophic bacterium Marichromatium gracile. [So] Source: World J Microbiol Biotechnol;33(6):113, 2017 Jun. [Is] ISSN: 1573-0972 [Cp] País de publicação: Germany [La] Idioma: eng [Ab] Resumo: Marichromatium gracile: YL28 (M. gracile YL28) is an anoxygenic phototrophic bacterial strain that utilizes ammonia, nitrate, or nitrite as its sole nitrogen source during growth. In this study, we investigated the removal and transformation of ammonium, nitrate, and nitrite by M. gracile YL28 grown in a combinatorial culture system of sodium acetate-ammonium, sodium acetate-nitrate and sodium acetate-nitrite in response to different initial dissolved oxygen (DO) levels. In the sodium acetate-ammonium system under aerobic conditions (initial DO = 7.20-7.25 mg/L), we detected a continuous accumulation of nitrate and nitrite. However, under semi-anaerobic conditions (initial DO = 4.08-4.26 mg/L), we observed a temporary accumulation of nitrate and nitrite. Interestingly, under anaerobic conditions (initial DO = 0.36-0.67 mg/L), there was little accumulation of nitrate and nitrite, but an increase in nitrous oxide production. In the sodium acetate-nitrite system, nitrite levels declined slightly under aerobic conditions, and nitrite was completely removed under semi-anaerobic and anaerobic conditions. In addition, M. gracile YL28 was able to grow using nitrite as the sole nitrogen source in situations when nitrogen gas produced by denitrification was eliminated. Taken together, the data indicate that M. gracile YL28 performs simultaneous heterotrophic nitrification and denitrification at low-DO levels and uses nitrite as the sole nitrogen source for growth. Our study is the first to demonstrate that anoxygenic phototrophic bacteria perform heterotrophic ammonia-oxidization and denitrification under anaerobic conditions. [Mh] Termos MeSH primário: Anaerobiose/fisiologia Chromatiaceae/metabolismo Nitrogênio/metabolismo Oxigênio/metabolismo Processos Fototróficos/fisiologia [Mh] Termos MeSH secundário: Acetatos/metabolismo Aerobiose/fisiologia Amônia/metabolismo Compostos de Amônio/metabolismo Bactérias Chromatiaceae/crescimento & desenvolvimento Desnitrificação Processos Heterotróficos/fisiologia Cinética Nitratos/metabolismo Nitrificação Nitritos/metabolismo Óxido Nitroso/metabolismo [Pt] Tipo de publicação: JOURNAL ARTICLE [Nm] Nome de substância: 0 (Acetates); 0 (Ammonium Compounds); 0 (Nitrates); 0 (Nitrites); 7664-41-7 (Ammonia); K50XQU1029 (Nitrous Oxide); N762921K75 (Nitrogen); RRE756S6Q2 (ammonium acetate); S88TT14065 (Oxygen) [Em] Mês de entrada: 1712 [Cu] Atualização por classe: 171201 [Lr] Data última revisão: 171201 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 170505 [St] Status: MEDLINE [do] DOI: 10.1007/s11274-017-2280-z

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