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| Registros recuperados: 341 | |
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| Bunetel, L; Segui, A; Guerin, J; Lerman, I; Cormier, M. |
| The principle of this method is to evaluate, by counts exercised upon selective media, the relative importance of the different bacteria families in the flora of the coastal waters. It is important to separate the contaminant species and the commensal species in the marine environment. Ten culture media distributed into four categories (selective, non selective, saline and non saline) were examined by numeration. Counts were transferred on a diagram allowing to plot down a profile of bacterial flora of water sampled from a given geographical area. The profiles are arranged by a classification method. The sampling points with similar or adjoining profiles were assembled and marked on the chart. In this way, the authors obtained areas representing the impact... |
| Tipo: Text |
Palavras-chave: Bacteria; Coastal waters; Microbiological culture; Sewage disposal; Microbial contamination; Bacterial counters; Bacteria collecting devices. |
| Ano: 1984 |
URL: http://archimer.ifremer.fr/doc/1984/acte-1004.pdf |
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| Kurata, A. |
| The changes in concentration of thiamine, biotin and vitamin B sub(12) in water of the soaked bottles for 6 h in situ in the north basin of Lake Biwa were examined successively over 30 hours. The concentrations of the vitamins changed comparatively during 6 h. soaking in situ. Generally, the concentrations of thiamine, biotin and vitamin B sub(12) were in high levels in the morning and in low levels in evening both in the soaked bottles and in the surrounding water. The fluctuation ranges in concentration of vitamins in a 5 m deep layer were greater than those in thermocline. From the data obtained with the soaked bottles in situ, it was supposed that the decrease of vitamins in concentration during the daytime surpass consumption of vitamins by... |
| Tipo: Text |
Palavras-chave: Phytoplankton; Microorganisms; Bacteria; Metabolism; Biological production; Vitamin B; Fresh water. |
| Ano: 1984 |
URL: http://archimer.ifremer.fr/doc/1984/acte-958.pdf |
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| Chevignon, Germain; Boyd, Bret M.; Brandt, Jayce W.; Oliver, Kerry M.; Strand, Michael R.. |
| Many insects host facultative, bacterial symbionts that confer conditional fitness benefits to their hosts. Hamiltonella defensa is a common facultative symbiont of aphids that provides protection against parasitoid wasps. Protection levels vary among strains of H. defensa that are also differentially infected by bacteriophages named APSEs. However, little is known about trait variation among strains because only one isolate has been fully sequenced. Generating complete genomes for facultative symbionts is hindered by relatively large genome sizes but low abundances in hosts like aphids that are very small. Here, we took advantage of methods for culturing H. defensa outside of aphids to generate complete genomes and transcriptome data for four strains of... |
| Tipo: Text |
Palavras-chave: Insect; Aphid; Bacteria; Comparative genomics; Parasitoid; Defense. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00635/74665/74590.pdf |
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| Gendronneau, Maud; Haure, Joel; Jeanneret, Hélène; Le Merrer, Yoann; Lequette, Camille; Lomakine, Cédric; Martin, Jean-louis; Papin, Mathias; Ponthoreau, Catherine; Robin, Marc. |
| Ifremer, Nantes University and the township community "CAP Atlantique" have joined their skills to try to better understand how two key conchological areas in the shore economy of the Pays de la Loire area develop, especially since, environmentally, little is known about them, and because they face recurrent issues on the zootechnic level. This programme encompasses two main topics: assessment of environmental inputs (catchments areas input, contaminants evolution in the area, and impact on the conchological zones) and a study of the conchological culture (growth, mortality, analysis of the stocks). Concomitantly, operational tools (hydrodynamic and flux transfer models, databases, SIG) are developed to improve local management of the sites and information... |
| Tipo: Text |
Palavras-chave: Phytosanitary; Bacteria; SIG; Conchological stocks; Modelization; Catchment areas; Continental inputs; Pen Bé; Le Croisic; Phytosanitary; Bacteria; SIG; Conchological stocks; Modelization; Catchment areas; Continental inputs; Pen Bé; Le Croisic. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/rapport-1264.pdf |
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| Kim, S; Hoppe, H. |
| A rapid and sensitive method to detect the extracellular enzymatic activity of bacteria colonies grown on agar plates is described. Selective agar media supplemented with protein, starch, chitin, Tween-80, etc. are conventionally used to detect biochemical properties of bacteria. It has been experimentally demonstrated with bacteria pure cultures that fluorogenic Methylumbelliferyl (MUF)-substrates are excellent substrate analogues for normally occurring polymers. Based on MUF-substrate hydrolysis the new method provides reliable qualitative estimates of extracellular enzymatic properties of bacteria within minutes using pure cultures as well as agar plates prepared for colony counts. |
| Tipo: Text |
Palavras-chave: Bacteria; Microbiological culture; Biochemical analysis; Enzymatic activity; Analytical techniques. |
| Ano: 1984 |
URL: http://archimer.ifremer.fr/doc/1984/acte-959.pdf |
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| Le Chevanton, Myriam; Garnier, Matthieu; Lukomska, Ewa; Schreiber, Nathalie; Cadoret, Jean-paul; Saint-jean, Bruno; Bougaran, Gael. |
| Interactions between photosynthetic and non-photosynthetic microorganisms play an essential role in natural aquatic environments and the contribution of bacteria and microalgae to the nitrogen cycle can lead to both competitive and mutualistic relationships. Nitrogen is considered to be, with phosphorus and iron, one of the main limiting nutrients for primary production in the oceans and its availability experiences large temporal and geographical variations. For these reasons, it is important to understand how competitive and mutualistic interactions between photosynthetic and heterotrophic microorganisms are impacted by nitrogen limitation. In a previous study performed in batch cultures, the addition of a selected bacterial strain of Alteromonas sp.... |
| Tipo: Text |
Palavras-chave: Interactions; Nitrogen limitation; Microalgae; Bacteria; Chemostat; Dissolved organic matter (DOM); Dunaliella. |
| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00344/45529/45087.pdf |
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| White, D. |
| Microbes in nature are often concentrated on surfaces where they exist in microcolonies of mixed composition. The assay of these mixed microbial consortia by utilizing biochemical components eliminates the problems associated with cultural selectivity of viable counts or the requirement for quantitative release from surfaces required in some microscopic techniques. The assay of cellular components restricted to subsets of the microbial community gives insights into the community structure of the biofilm whereas assay of cellular components common to all cells can be used for biomass estimations. Formation of endogenous storage materials can be utilized as measures of nutritional status and rates of formation or turnover of specific "signatures" from... |
| Tipo: Text |
Palavras-chave: Bacteria; Fouling; Bioassays; Metabolism; Surfaces; Bacteria collecting devices; Culture media; Microbiological analysis. |
| Ano: 1984 |
URL: http://archimer.ifremer.fr/doc/1984/acte-963.pdf |
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| Loka Bharathi, Pa; Nair, S; Bd De Souza, Mj; Chandramohan, D. |
| During the austral summer, we examined the bacterial population along the cruise track extending from 70degrees S and 18degrees E to 30degrees S and 35degrees E. During the cruise, three distinct fractions of the bacterioplankton viz. total count, total direct viable and retrievable counts were simultaneously enumerated in these waters. In the stations south of the convergent region designated as section I the population ranged within 10(8-9) L-1 whereas in the north of the region designated as section 11 they were one order higher and ranged from 10(9-10) L-1. The percentage of viability in the region was high corresponding to the generally high chlorophyll and primary productivity encountered in the eastern Aghulas bank. The study substantiates the... |
| Tipo: Text |
Palavras-chave: Bactérie; Viabilité; Océan Antarctique; Secteur indien; Bacteria; Viability; Antarctic ocean; Indian side. |
| Ano: 2001 |
URL: http://archimer.ifremer.fr/doc/00322/43334/42893.pdf |
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| Dodin, A; Dosso, M; Guillou, M. |
| There exists no biochemical test allowing to define the pathogenicity of a bacterium, still less for a Vibrionaceae. Two essential characters are to be retained to hold responsible an isolated germ, for an illness: 1) the binding factor, the identification is difficult but a double diffusion of agar should simplify the method; 2) the search for the choleric toxin or a common part of the choleric toxin (toxin LT or ST of E. coli ). Here again, simplified techniques may be used. The acquirement of a plasmid responsible for the binding factor or for the toxin production of the non-pathogenic Vibrionaceae in the origin of certain epidemic diseases in France and in the world. Frequently, epidemics due to common germs (Aeromonas hydrophila of Africa) lead to... |
| Tipo: Text |
Palavras-chave: Aeromonas hydrophila; Vibrionaceae; Bacteria; Ecology; Microorganisms; Hosts; Bacterial diseases; Pathogenic bacteria. |
| Ano: 1984 |
URL: http://archimer.ifremer.fr/doc/1984/acte-999.pdf |
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| Sharma, A; Battersby, N; Stewart, D. |
| The Minimal Inhibitory Concentration (MIC) of a biocide is usually determined by adding it in various concentrations to a suitable growth medium which is then inoculated with the test bacterium. These cultures are then observed for up to 28 days for growth of the organism as shown by its production of black ferrous sulphide. A method has been developed whereby the MIC of a biocide can be found within 4 days. Instead of noting ferrous sulphide production, this new method measures changes in: 1) optical density and 2) sulphate reduction of a logarithmic culture of the test strain exposed to the biocide. |
| Tipo: Text |
Palavras-chave: Bacteria; Microorganisms; Pesticides; Analytical techniques; Sulfate reduction. |
| Ano: 1984 |
URL: http://archimer.ifremer.fr/doc/1984/acte-1016.pdf |
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| Pérez-pascual, David; Estellé, Jordi; Dutto, Gilbert; Rodde, Charles; Bernardet, Jean-françois; Marchand, Yann; Duchaud, Eric; Przybyla, Cyrille; Ghigo, Jean-marc. |
| Innovative fish diets made of terrestrial plants supplemented with sustainable protein sources free of fish-derived proteins could contribute to reducing the environmental impact of the farmed fish industry. However, such alternative diets may influence fish gut microbial community, health, and, ultimately, growth performance. Here, we developed five fish feed formulas composed of terrestrial plant-based nutrients, in which fish-derived proteins were substituted with sustainable protein sources, including insect larvae, cyanobacteria, yeast, or recycled processed poultry protein. We then analyzed the growth performance of European sea bass (Dicentrarchus labrax L.) and the evolution of gut microbiota of fish fed the five formulations. We showed that... |
| Tipo: Text |
Palavras-chave: European sea bass; Fish gut microbiota; Bacteria. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00646/75830/76816.pdf |
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| Lesel, R; Fauconneau, B; Alzieu, P. |
| The present study concerns bacterial transit in the digestive tract of rainbow trout at 13 degree C and compares fecal excretion of 4 tracers in the alimentary bolus, an inert bacterial tracer: spores of Bacillus stearothermophilus , a bacterial marker capable of multiplying in the digestive organs: Citrobacter freundii ; a tracer of the liquid phase: polyethylene glycol (PEG), a tracer of the solid phase: Cr sub(2)O sub(3). Two peaks of fecal excretion of bacterial bodies are indicated in the results, the first one taking place within the first 4 h following ingestion of the traced meal, the second peak, a hundred times more important, occurring 10 h after the meal. This two-phase mode of excretion corroborates the observations previously made. The... |
| Tipo: Text |
Palavras-chave: Citrobacter freundii; Bacillus stearothermophilus; Bacteria; Excretion; Tracer techniques. |
| Ano: 1984 |
URL: http://archimer.ifremer.fr/doc/1984/acte-995.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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| Registros recuperados: 341 | |
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