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| Registros recuperados: 21 | |
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| Roussel, Erwan; Sauvadet, Anne-laure; Chaduteau, Carine; Fouquet, Yves; Charlou, Jean-luc; Prieur, Daniel; Cambon, Marie-anne. |
| P>The distribution of the archaeal communities in deep subseafloor sediments [0-36 m below the seafloor (mbsf)] from the New Caledonia and Fairway Basins was investigated using DNA- and RNA-derived 16S rRNA clone libraries, functional genes and denaturing gradient gel electrophoresis (DGGE). A new method, Co-Migration DGGE (CM-DGGE), was developed to access selectively the active archaeal diversity. Prokaryotic cell abundances at the open-ocean sites were on average similar to 3.5 times lower than at a site under terrestrial influence. The sediment surface archaeal community (0-1.5 mbsf) was characterized by active Marine Group 1 (MG-1) Archaea that co-occurred with ammonia monooxygenase gene (amoA) sequences affiliated to a group of uncultured... |
| Tipo: Text |
Palavras-chave: Marine subsurface sediments; Sea floor biosphere; Gradient gel electrophoresis; Microbial communities; Molecular diversity; Anaerobic oxidation; Sequence alignment; Phylogenetic trees; Extracellular DNA; Methane hydrate. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-6801.pdf |
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| Silveira,Érico Leandro da; Pereira,Rodrigo Matheus; Scaquitto,Denilson César; Pedrinho,Eliamar Aparecida Nascimbém; Val-Moraes,Silvana Pómpeia; Wickert,Ester; Carareto-Alves,Lúcia Maria; Lemos,Eliana Gertrudes de Macedo. |
| Studies on the impact of Eucalyptus spp. on Brazilian soils have focused on soil chemical properties and isolating interesting microbial organisms. Few studies have focused on microbial diversity and ecology in Brazil due to limited coverage of traditional cultivation and isolation methods. Molecular microbial ecology methods based on PCR amplified 16S rDNA have enriched the knowledge of soils microbial biodiversity. The objective of this work was to compare and estimate the bacterial diversity of sympatric communities within soils from two areas, a native forest (NFA) and an eucalyptus arboretum (EAA). PCR primers, whose target soil metagenomic 16S rDNA were used to amplify soil DNA, were cloned using pGEM-T and sequenced to determine bacterial diversity.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Genetic diversity; Metagenomic; Microbial communities. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2006001000008 |
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| Vanreusel, Ann; Andersen, Ann C.; Boetius, Antje; Connelly, Douglas; Cunha, Marina R.; Decker, Carole; Hilario, Ana; Kormas, Konstantinos Ar.; Maignien, Lois; Olu, Karine; Pachiadaki, Maria; Ritt, Benedicte; Rodrigues, Clara; Sarrazin, Jozee; Tyler, Paul; Van Gaever, Saskia; Vanneste, Heleen. |
| During the European Commission's Framework Six Programme, HERMES, we investigated three main areas along the European margin, each characterized by the presence of seep-related structures exhibiting different intensity of activity and biological diversity. These areas are: (1) the Nordic margin with the Hakon Mosby mud volcano and many pockmarks, (2) the Gulf of Cadiz, and (3) the eastern Mediterranean with its hundreds of mud volcanoes and brine pool structures. One of the main goals of the HERMES project was to unravel the biodiversity associated with these seep-associated ecosystems, and to understand their driving forces and functions, using an integrated approach. Several multidisciplinary research cruises to these three areas provided evidence of... |
| Tipo: Text |
Palavras-chave: Mosby mud volcano; Gulf of mexico; Cadiz ne atlantic; Deep sea fan; Community structure; Microbial communities; Fluid flow; Mediterranean sea; Carbonate crusts; Norwegian sea. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-6375.pdf |
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| Jeanbille, Mathilde; Gury, Jérôme; Duran, Robert; Tronczynski, Jacek; Ghiglione, Jean-françois; Agogué, Hélène; Saïd, Olfa Ben; Taïb, Najwa; Debroas, Didier; Garnier, Cédric; Auguet, Jean-christophe. |
| Benthic microorganisms are key players in the recycling of organic matter and recalcitrant compounds such as polyaromatic hydrocarbons (PAHs) in coastal sediments. Despite their ecological importance, the response of microbial communities to chronic PAH pollution, one of the major threats to coastal ecosystems, has received very little attention. In one of the largest surveys performed so far on coastal sediments, the diversity and composition of microbial communities inhabiting both chronically contaminated and non-contaminated coastal sediments were investigated using high-throughput sequencing on the 18S and 16S rRNA genes. Prokaryotic alpha-diversity showed significant association with salinity, temperature, and organic carbon content. The effect of... |
| Tipo: Text |
Palavras-chave: Microbial communities; PAH; Chronic contamination; Coastal sediment; Functional diversity. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00347/45854/45522.pdf |
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| Mazzetto,Andre Mancebo; Feigl,Brigitte Josefine; Cerri,Carlos Eduardo Pellegrino; Cerri,Carlos Clemente. |
| Abstract Land use changes strongly impact soil functions, particularly microbial biomass diversity and activity. We hypothesized that the catabolic respiration response of the microbial biomass would differ depending on land use and that these differences would be consistent at the landscape scale. In the present study, we analyzed the catabolic response profile of the soil microbial biomass through substrate-induced respiration in different land uses over a wide geographical range in Mato Grosso and Rondônia state (Southwest Amazon region). We analyzed the differences among native areas, pastures and crop areas and within each land use and examined only native areas (Forest, Dense Cerrado and Cerrado), pastures (Nominal, Degraded and Improved) and crop... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Amazon region; Land use change; Catabolic profile; Microbial communities. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822016000100063 |
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| Lima,Felipe Rezende; Ferreira,Almir José; Menezes,Cristine Gobbo; Miranda,Vitor Fernandes Oliveira; Dourado,Manuella Nóbrega; Araújo,Welington Luiz. |
| ABSTRACT Carnivorous plant species, such as Utricularia spp., capture and digest prey. This digestion can occur through the secretion of plant digestive enzymes and/or by bacterial digestive enzymes. To comprehend the physiological mechanisms of carnivorous plants, it is essential to understand the microbial diversity related to these plants. Therefore, in the present study, we isolated and classified bacteria from different organs of Utricularia breviscapa (stolons and utricles) and from different geographic locations (São Paulo and Mato Grosso). We were able to build the first bacterium collection for U. breviscapa and study the diversity of cultivable bacteria. The results show that U. breviscapa bacterial diversity varied according to the geographic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Utricularia breviscapa; Microbial ecology; Aquatic microbiota; Microbial communities. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822018000400714 |
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| Yang,Yu; Shi,Wuyang; Wan,Minxi; Zhang,Yanfei; Zou,Lihong; Huang,Jufang; Qiu,Guanzhou; Liu,Xueduan. |
| This study presents bacterial population analyses of microbial communities inhabiting three sites of acid mine drainage (AMD) in the Shen-bu copper mine, Gansu Province, China. These sites were located next to acid-leached chalcopyrite slagheaps that had been abandoned since 1995. The pH values of these samples with high concentrations of metals ranged from 2.0 to 3.5. Amplified ribosomal DNA restriction analysis (ARDRA) was used to characterize the bacterial population by amplifying the 16S rRNA gene of microorganisms. A total of 39 operational taxonomic units (OTUs) were obtained from the three samples and sequenced from 384 clones. Sequence data and phylogenetic analyses showed that two dominant clones (JYC-1B, JYC-1D) in sample JYC-1 represented 69.5%... |
| Tipo: Journal article |
Palavras-chave: Acid mine drainage; Amplified ribosomal DNA restriction analysis; Microbial communities. |
| Ano: 2008 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000100001 |
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| Francois, David. |
| In deep-sea hydrothermal vents, the mixing between hot, acidic and anoxic hydrothermal fluid with seawater leads to the formation of hydrothermal chimneys. These are porous structures whose mineralogical composition changes over time. Thermal and chemical gradients are favourable to the growth of microbial communities, that present a high taxonomic, physiologic and metabolic diversity. Despite numerous studies about the microbiology of hydrothermal environments, the spatial and temporal dynamics of microbial communities in hydrothermal vents remain relatively unknown. Our study was based on a rigorous sampling of hydrothermal chimneys from six sites in the Lucky Strike hydrothermal vent field, and the associated proximal plume. The mineralogical... |
| Tipo: Text |
Palavras-chave: Sources hydrothermales; Communautés microbiennes; Persephonella; Hydrothermal vents; Microbial communities; Persephonella. |
| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00690/80209/83298.pdf |
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| Bianchi, A.. |
| Bacteriological study of abyssal sediments: During the Demeraby mission of the N/O Jean Charcot in the western Atlantic Ocean, a study of the microflora of the digestive tracts of echinoderms (Holothuroidea of various genera, Asteroidea, Echinoidea) was compared with that of the surrounding sediment. The bacterial concentration observed in the digestive tracts of all the animals studied is higher than that in the surrounding sediments. The largest numbers were always found in the most anterior part of the digestive tracts of the holothurians. In some cases, the increase is considerable (7.10 versus 5.2. 10 cells per millilitre): It indicates a proliferation of bacterial cells in the anterior part of the digestive tract. As the sediment moves through the... |
| Tipo: Text |
Palavras-chave: Conchylaceous parks; Microbial communities; Abyssal sediments; Bacteriological study. |
| Ano: 1981 |
URL: http://archimer.ifremer.fr/doc/1981/rapport-1926.pdf |
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| Andreote,Fernando Dini; Gumiere,Thiago; Durrer,Ademir. |
| A plethora of microbial cells is present in every gram of soil, and microbes are found extensively in plant and animal tissues. The mechanisms governed by microorganisms in the regulation of physiological processes of their hosts have been extensively studied in the light of recent findings on microbiomes. In plants, the components of these microbiomes may form distinct communities, such as those inhabiting the plant rhizosphere, the endosphere and the phyllosphere. In each of these niches, the "microbial tissue" is established by, and responds to, specific selective pressures. Although there is no clear picture of the overall role of the plant microbiome, there is substantial evidence that these communities are involved in disease control, enhance... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Microbial communities; Rhizosphere; Endophytes; Phyllosphere. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000600013 |
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| Gruenke, S.; Lichtschlag, A.; De Beer, D.; Felden, J.; Salman, V.; Ramette, A.; Schulz-vogt, H. N.; Boetius, A.. |
| This study investigated the bacterial diversity associated with microbial mats of polar deep-sea cold seeps. The mats were associated with high upward fluxes of sulfide produced by anaerobic oxidation of methane, and grew at temperatures close to the freezing point of seawater. They ranged from small patches of 0.2-5 m in diameter (gray mats) to extensive fields covering up to 850 m(2) of seafloor (white mats) and were formed by diverse sulfide-oxidizing bacteria differing in color and size. Overall, both the dominant mat-forming thiotrophs as well as the associated bacterial communities inhabiting the mats differed in composition for each mat type as determined by microscopy, 16S rRNA gene sequencing and automated ribosomal intergenic spacer analysis.... |
| Tipo: Text |
Palavras-chave: Mosby mud volcano; Gulf of mexico; Eastern mediterranean sea; Filamentous sulfur bacteria; Sulfide oxidizing bacteria; In situ hybridization; Sulfate reduction; Microbial communities; Marine sediments; Beggiatoa spp. |
| Ano: 2012 |
URL: https://archimer.ifremer.fr/doc/00212/32360/30823.pdf |
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| Cruaud, Perrine; Vigneron, Adrien; Pignet, Patricia; Caprais, Jean-claude; Lesongeur, Francoise; Toffin, Laurent; Godfroy, Anne; Cambon-bonavita, Marie-anne. |
| The Sonora Margin cold seeps present a seafloor mosaic pattern consisting of different faunal assemblages and microbial mats. To better understand if sedimentary microbial communities reflect this patchy distribution, all major habitats were investigated using four complementary approaches: 16S rRNA gene sequence 454 pyrosequencing, quantitative polymerase chain reaction, fluorescence in situ hybridization and geochemistry analyses. This study reveals that sediments populated by different surface assemblages show distinct porewater geochemistry features and are associated with distinct microbial communities. In the sediments underlying the microbial mat and the surrounding macrofauna, microbial communities were dominated by anaerobic methane oxidizers... |
| Tipo: Text |
Palavras-chave: Microbial communities; Pyrosequencing; MBG-D; ANME; Faunal assemblages; Vesicomyidae; Siboglinidae; Microbial mat. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00288/39889/38434.pdf |
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| Postec, Anne; Quemeneur, Marianne; Bes, Meline; Mei, Nan; Benaissa, Fatma; Payri, Claude; Pelletier, Bernard; Monnin, Christophe; Guentas-dombrowsky, Linda; Ollivier, Bernard; Gerard, Emmanuelle; Pisapia, Celine; Gerard, Martine; Menez, Benedicte; Erauso, Gael. |
| Active carbonate chimneys from the shallow marine serpentinizing Prony Hydrothermal Field were sampled 3 times over a 6 years period at site ST09. Archaeal and bacterial communities composition was investigated using PCR-based methods (clone libraries, Denaturating Gel Gradient Electrophoresis, quantitative PCR) targeting 16S rRNA genes, methyl coenzyme M reductase A and dissimilatory sulfite reductase subunit B genes. Methanosarcinales (Euryarchaeota) and Thaumarchaea were the main archaeal members. The Methanosarcinales, also observed by epifluorescent microscopy and FISH, consisted of two phylotypes that were previously solely detected in two other serpentinitzing ecosystems (The Cedars and Lost City Hydrothermal Field). Surprisingly, members of the... |
| Tipo: Text |
Palavras-chave: Hydrothermal; Serpentinization; Alkaline; Prony; Microbial communities. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00467/57916/60307.pdf |
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| Escalas, Arthur; Hale, Lauren; Voordeckers, James W.; Yang, Yunfeng; Firestone, Mary K.; Alvarez‐cohen, Lisa; Zhou, Jizhong. |
| Functional diversity is increasingly recognized by microbial ecologists as the essential link between biodiversity patterns and ecosystem functioning, determining the trophic relationships and interactions between microorganisms, their participation in biogeochemical cycles, and their responses to environmental changes. Consequently, its definition and quantification have practical and theoretical implications. In this opinion paper, we present a synthesis on the concept of microbial functional diversity from its definition to its application. Initially, we revisit to the original definition of functional diversity, highlighting two fundamental aspects, the ecological unit under study and the functional traits used to characterize it. Then, we discuss how... |
| Tipo: Text |
Palavras-chave: Functional diversity; Functional traits; Microbial communities; Theoretical frameworks of diversity; Trait-based ecology. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00584/69631/67487.pdf |
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| DIAS, L. A. F.; LOPES, I. de O. N.; CATTELAN, A. J.; DEBIASI, H.; SIBALDELLI, R. N. R.; KOSINSK, C. L.; SEIXAS, C. D. S.; ALMEIDA, A. M. R.. |
| A rotação de culturas é estratégia importante no controle de insetos-pragas e doenças. No entanto, a dimensão de sua efetividade depende da duração da rotação e/ou do histórico do solo, das culturas implantadas no sistema, bem como a sequência e a frequência das mesmas. Este trabalho relata os efeitos de diferentes sistemas de rotação utilizando soja, milho, milho safrinha, tremoço-branco, ervilha-forrageira, trigo e aveia sobre a comunidade microbiana dos solos em sistema de plantio direto. Além desses tratamentos, foram considerados dois tratamentos testemunha: monocultivo de trigo e monocultivo de aveia, em sistema de plantio convencional. As amostras de solo foram coletadas em ensaio de rotação de culturas iniciado em 1989, tendo sido as avaliações... |
| Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) |
Palavras-chave: Soja; Rotação de Cultura; Bactéria; Fungo; Soybeans; Cropping systems; Microbial communities. |
| Ano: 2018 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1100651 |
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| Registros recuperados: 21 | |
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