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| Registros recuperados: 341 | |
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| Pascal, P.y.; Dupuy, C; Richard, P; Rzeznik-orignac, J; Niquil, Nathalie. |
| The fate of the benthic bacterial biomass is a topic of major importance in understanding how softbottom environments function. Because of their high abundance, production and nutritional value, benthic bacteria may constitute an important food resource for benthic fauna. The trophic role of bacteria for a nematode community on the Brouage mudflat (Marennes-Ole´ron-France), dominated by three species: Chromadora macrolaima (64% of the abundance), Daptonema oxycerca (15%) and Ptycholaimellus jacobi (8%), was determined in grazing experiments using 15N pre-enriched bacteria. On intertidal flats, seasonal, tidal and circadian cycles induce strong variations in environmental conditions. Grazing experiments were performed in order to measure the effects of... |
| Tipo: Text |
Palavras-chave: Mudflat; Environmental factor; Grazing; Bacteria; Nematode. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-4295.pdf |
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| Masson, Daniel; Courtois, Olivier; Masson, Nadine; Guesdon, Stephane; Rocher, Gregory. |
| Due to important economic activities along the French oastline, the introduction of noxious organisms into French coastal waters, particularly by ship ballast water, may have serious consequences. After preliminary studies of ship movements in Charente Maritime, several samplings of ballast water and sediment were made. Samples were taken in five major harbours in France, along the Atlantic, Channel and Mediterranean coastlines. The main task of this first assessment was the research for exotic and possibly noxious phytoplancton. Clostridium and Vibrio bacteria were also tested for. The results are presented and discussed, with plans for further work. |
| Tipo: Text |
Palavras-chave: Bacteria; Phytoplancton; French coastal waters; Ballast water. |
| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/2000/acte-7364.pdf |
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| Fontanier, Christophe; Koho, K. A.; Goni-urriza, M. S.; Deflandre, Bruno; Galaup, S.; Ivanovsky, A.; Gayet, Nicolas; Dennielou, Bernard; Gremare, Antoine; Bichon, S.; Gassie, C.; Anschutz, P.; Duran, R.; Reichart, G. J.. |
| We present ecological and isotopic (δ18O and δ13C) data on benthic foraminifera sampled from 4 deep-sea stations in a pockmark field from the deep-water Niger delta (Gulf of Guinea, Equatorial Atlantic Ocean). In addition, a series of sedimentological and (bio)geochemical data are shown to back up foraminiferal observations. All stations are located within 1.2 km of each other, so prevailing oceanographic conditions can be assumed to be similar at each site. Two of the sites (GMMC-01 and GMMC-02) are located in a pockmark (named “pockmark A”) where current methane seepages were recorded by ROV observations. A third station (GMMC-03) is located in the topographic depression interpreted as a collapsed pockmark (named “pockmark B”). The fourth site (GMMC-04)... |
| Tipo: Text |
Palavras-chave: Niger delta; Hydrate pockmark; Foraminifera; Stable isotopes; Bacteria. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00211/32194/30628.pdf |
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| Cruz, Kimberly; Guezennec, Jean; Barkay, Tamar. |
| Bacteria employ adaptive mechanisms of mercury (Hg) tolerance to survive in environments containing elevated Hg concentrations. The potential of extracellular polysaccharides (EPS) production by bacteria as a mechanism of Hg tolerance has not been previously investigated. The objectives of this study were to determine if bacterial EPS sorb Hg, and if so does sorption provide protection against Hg toxicity. Purified EPS with different chemical compositions produced by bacterial isolates from microbial mats in French Polynesian atolls and deep-sea hydrothermal vents were assessed for Hg sorption. The data showed that EPS sorbed up to 82% of Hg from solution, that this sorption was dependent on EPS composition, and that sorption was a saturable mechanism. Hg... |
| Tipo: Text |
Palavras-chave: Mercury; Bacteria; Sorption; Tolerance; Exocellular polysaccharides. |
| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00382/49348/49786.pdf |
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| Romero-Noguera,Julio; Martín-Sánchez,Inés; López-Miras,María del Mar; Ramos-López,José Miguel; Bolívar-Galiano,Fernando. |
| Since the middle of the XIX century, when dammar became popular in Occident, this natural resin is one of the most used in art painting techniques as final protective coating (varnish) as well as a component of pictorial media. The present work is the first approach to the study of the microbiological biodeterioration of this artistic material, which can seriously affect the appearance and integrity of works of art when bad conservation conditions -especially high humidity levels- take place. 12 microorganisms, fungi and bacteria, came from collection and from oil paintings affected by biodeterioration patterns, were inoculated on test specimens prepared with varnish dammar. These were incubated and analyzed by GC-MS to determine both the microbiological... |
| Tipo: Journal article |
Palavras-chave: Bacteria; Biodeterioration; Dammar; Fungi; GC-MS. |
| Ano: 2010 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000300006 |
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| Andrade,Milene Aparecida; Cardoso,Maria das Graças; Gomes,Marcos de Souza; Azeredo,Camila Maria Oliveira de; Batista,Luís Roberto; Soares,Maurilio José; Rodrigues,Leonardo Milani Avelar; Figueiredo,Ana Cristina S.. |
| This study had analyzed the antibacterial, antifungal and trypanocidal activity of the essential oils from Cinnamodendron dinisii Schwacke (Canellaceae) and Siparuna guianensis Aublet (Siparunaceae). The essential oils were obtained from fresh leaves by hydrodistillation, using a modified Clevenger apparatus. Chemical analysis by gas-liquid chromatography coupled to mass spectrometry (GC-MS) showed that these essential oils are rich in monoterpene and sesquiterpene hydrocarbons. Activity against the pathogenic bacteria Escherichia coli, Listeria monocytogenes, Pseudomonas aeruginosa, Salmonella choleraesuis and Staphylococcus aureus was evaluated with the agar cavity diffusion method, while activity on the filamentous fungi Aspergillus flavus, Aspergillus... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Volatile oils; Fungi; Bacteria; Trypanosoma cruzi. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822015000100189 |
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| Cauerhff,Ana; Castro,Guillermo R. |
| Background: In the past decade, considerable attention has been paid for the development of novel strategies for the synthesis of different kind of nano-objects. Most of the current strategies are usually working by the use physical or chemical principles to develop a myriad of nano-objects with multiple applications. Main fields of nanotechnology applications range from catalysis, micro- and nano-electronics (semiconductors, single electrons transistors), non-linear optic devices, photo-electrochemistry to biomedicine, diagnostics, foods and environment, chemical analysis and others. Results: Two main avenues for nanoparticles synthesis: cell-free extract and cell cultivation have been reported. The state of art of both biotechnological approaches for... |
| Tipo: Journal article |
Palavras-chave: Bacteria; Bionanoparticles; Fermentation; Fungi green chemistry; Plant extracts. |
| Ano: 2013 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000300011 |
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| Odisi,Estácio Jussie; Silvestrin,Marcela Bruschi; Takahashi,Rodrigo Yoji Uwamori; da Silva,Marcus Adonai Castro; Lima,André Oliveira de Souza. |
| Background: Cellulases and lipases have broad industrial application, which calls for an urgent exploration of microorganisms from extreme environments as valuable source of commercial enzyme. In this context, the present work describes the bioprospection and identification of deep-sea bacteria that produce cellulases and lipases, as well their optimal temperature of activity. Results: The first step of this study was the screening of cellulolytic and lipolytic deep-sea bacteria from sediment and water column, which was conducted with substrates linked with 4-Methylumbelliferyl. Among the 161 strains evaluated, 40 were cellulolytic, 23 were lipolytic and 5 exhibited both activities. Cellulolytic and lipolytic bacteria are more common in sediment than at... |
| Tipo: Journal article |
Palavras-chave: Bacteria; Cellulases; Deep-sea; Lipases. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000500018 |
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| Zbinden, Magali; Gallet, Alison; Szafranski, Kamil M.; Machon, Julia; Ravaux, Juliette; Leger, Nelly; Duperron, Sebastien. |
| In crustaceans, as in other animals, perception of environmental cues is of key importance for a wide range of interactions with the environment and congeners. Chemoreception involves mainly the antennae and antennules, which carry sensilla that detect water-borne chemicals. The functional importance of these as exchange surfaces in the shrimp's sensory perception requires them to remain free of any microorganism and deposit that could impair the fixation of odorant molecules on sensory neurons. We report here the occurrence of an unexpected dense bacterial colonization on surface of the antennae and antennules of four hydrothermal vent shrimp species. Microscopic observation, qPCR and 16S rRNA barcoding reveal the abundance, diversity and taxonomic... |
| Tipo: Text |
Palavras-chave: Hydrothermal; Shrimp; Alvinocarididae; Chemosensory perception; Antennules; Bacteria; Grooming. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00484/59527/62507.pdf |
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| Wery, Nathalie; Moricet, Jean-marc; Cueff, Valerie; Jean, Joelle; Pignet, Patricia; Lesongeur, Francoise; Cambon-bonavita, Marie-anne; Barbier, Georges. |
| A thermophilic, anaerobic, chemo-organotrophic bacterium, designated MV1087(T), was isolated from a deep-sea hydrothermal chimney sample collected from the Mid-Atlantic Ridge. The cells were straight, motile and stained Gram-negative. Growth was observed from 45 to 65 degreesC, with an optimum around 65 degreesC. No growth was observed at 40 or 70 degreesC. Growth was observed from pH 5.5 to 9.0 and the optimum pH was around 7. The salinity range for growth was 10-100 g sea salt l(-1) (corresponding to 6.5-65 g NaCl l(-1)) with an optimum at 30 g sea salt l(-1) (20 g NaCl l(-1)). Strain MV1087(T) was heterotrophic, able to ferment proteinaceous substrates, such as brain/heart infusion and gluten, and carbohydrates, such as glucose, xylan and starch. The... |
| Tipo: Text |
Palavras-chave: Thermophile; Deep sea vent; Caloranaerobacter azorensis; Caloranaerobacter; Bacteria. |
| Ano: 2001 |
URL: http://archimer.ifremer.fr/doc/2001/publication-586.pdf |
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| Beldarraín, T.; Cepero, Y.; Bruselas, A.; Santos, R.; Ramos, M.; Moya, Y.; Núñez, M.; Vergara, N.. |
| En este trabajo se caracterizaron tecnológicamente, a escala de laboratorio, 5 cultivos iniciadores. Las propiedades tecnológicas evaluadas fueron pH en caldo glucosado, viabilidad del cultivo, tolerancia a elevada concentración de sal, inactivación a 60 ºC por 30 min, entre otras. Todos los cultivos, por sus aptitudes acidificantes y población celular se consideraron aptos para su empleo industrial y se pudieron categorizar como productores de baja y alta acidez. |
| Tipo: Journal Contribution |
Palavras-chave: Bacteria; Starters; Lactic acid bacteria; Microbial starters; Media production; Meat products. |
| Ano: 2008 |
URL: http://hdl.handle.net/1834/4896 |
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| Rodriguez de Morán, A.. |
| The current research was developed in Bahia of Jaramijó in the Province of Manabí during 2008, as part of the major project: " Characterization of the Ecuadorian Coast" that has been developing by INOCAR, in order to contribute to the proper use of resources and the environment. It characterized and assesses the results obtained in the research of the quality of water of Bahía of Jaramijó, taking into consideration the averages and their behaviour in each level studied in two different season in the year (wet-dry) and in two tide condition (ebb and flow) of the different parameter physical, chemical and microbiological. During the research was established that coastal marine waters of Bahía of Jaramijó, not show pollution of organic origin neither... |
| Tipo: Journal Contribution |
Palavras-chave: Water quality; Environmental legislation; Bacteria; Pollution; Oxygen. |
| Ano: 2013 |
URL: http://hdl.handle.net/1834/5758 |
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| Registros recuperados: 341 | |
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