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| Klein, Geraldine; Soum-soutera, Emmanuelle; Bazire, Alexis; Dreanno, Catherine; Compere, Chantal; Dufour, Alain. |
| Bacterial biofilms, frequently in association with algae, protozoa and fungi, are found on all submerged structures in the marine environment. Biofilms are responsible for a range of surface‐associated and diffusible signals, which may moderate the settling behaviour of cells, spores and larvae. Thus, marine microorganisms are a new source of bioactive compounds, which enhance or inhibit the settlement of organisms. |
| Tipo: Text |
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| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/00089/20005/17667.pdf |
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| Dheilly, Alexandra; Soum-soutera, Emmanuelle; Klein, Geraldine; Bazire, Alexis; Compere, Chantal; Haras, Dominique; Dufour, Aurelie. |
| Biofilm formation results in medical threats or economic losses and is therefore a major concern in a variety of domains. In two-species biofilms of marine bacteria grown under dynamic conditions, Pseudoalteromonas sp. strain 3J6 formed mixed biofilms with Bacillus sp. strain 4J6 but was largely predominant over Paracoccus sp. strain 4M6 and Vibrio sp. strain D01. The supernatant of Pseudoalteromonas sp. 3J6 liquid culture (SN3J6) was devoid of antibacterial activity against free-living Paracoccus sp. 4M6 and Vibrio sp. D01 cells, but it impaired their ability to grow as single-species biofilms and led to higher percentages of nonviable cells in 48-h biofilms. Antibiofilm molecules of SN3J6 were able to coat the glass surfaces used to grow biofilms and... |
| Tipo: Text |
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| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00004/11530/11317.pdf |
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| Klein, Geraldine; Dufour, Alain; Compere, Chantal. |
| Lors d’une immersion en eau de mer, tous les matériaux et structures sont rapidement colonisés par des salissures d’origine biologique : des biofilms. La transformation des propriétés de surface dumatériau et la présence demicro- oumacro-organismes (bactéries, algues, balanes, larves) engendrent des risques accrus de corrosion localisée, la biodétérioration desmatériaux immergés, le blocage des fonctions mécaniques…Afin de contrôler le dépôt et le développement de ces biofilms, la méthode privilégiée est l’application de peintures anti-salissures. Cependant ces revêtements sont généralement toxiques pour l’environnement. C’est pourquoi, les travaux menés actuellement visent à isoler de nouvelles molécules, produites par les bactéries marines, dans le but... |
| Tipo: Text |
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| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00351/46213/45910.pdf |
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| Klein, Geraldine. |
| As soon as a surface area is immersed in a fluid, it can be colonised by micro-organisms and then be covered by a biofilm. The biofilms formation is a major preoccupation in medicine, as well as in the food industry as it could lead to substantial economic losses. The description and purification of new molecules, preventing or inhibiting the formation of biofilms are, therefore, of major interest. Two bacterial strains, Pseudoalteromonas sp. 3J6 and Pseudoalteromonas sp. D41 have been shown to have an inhibitory effect on the development of biofilms from other bacteria. The study involved, firstly, optimizing the production of inhibitory molecules and describing their scope of action and their effects. Secondly, these molecules were partially purified. In... |
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| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00089/19977/17643.pdf |
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| Klein, Geraldine; Soum-soutera, Emmanuelle; Bazire, Alexis; Dreanno, Catherine; Compere, Chantal; Dufour, Alain. |
| Marine organisms represent a rather unexplored source of new activity and biological functions of molecules for biotechnologies. The research in chemical ecology of the marine environment leads to looking at metabolites of recognition or defence produced by these models. Marine bacteria belonging to the Pseudoalteromonas genus of the Gammaproteobacteria class are often found in association with marine eukaryotes, and their ability to produce a variety of biological activities attracted a particular attention. The marine Pseudoalteromonas sp. 3J6 and D41 were selected for their capacity to inhibit the biofilm formation of other bacteria. The study of antibiofilm metabolites synthesised by marine bacteria 3J6 and D41 biofilms can lead to the development of... |
| Tipo: Text |
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| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/00089/19990/17666.pdf |
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| Klein, Geraldine; Kobayashi, K. |
| Leg 58 drilled three sites (442, 443, 444) in the Shikoku Basin and two (445, 446) in the Daito Ridge and Basin province (BRBP). At the Shikoku Basin sites, drilling penetrated hemipelagic clays and underlying tholeitic pillow basalts and sills. Basalt sills intruded both sediments and pillow lavas. The K-Ar age on pillow basalt is at variance with one magnetic anomaly interpretation, but in agreement with another. Rifting of the Shikoku Basin was either symmetrical or asymmetrical; off-ridge volcanism in the basin has made basement age resolution ambiguous. Rocks at the DRBP sites (445, 446) consist of an upper pelagic interval and a lower section of volcaniclastic turbidites and debris flow sandstones and conglomerates (intruded by 26 sills at 446).... |
| Tipo: Text |
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| Ano: 1981 |
URL: http://archimer.ifremer.fr/doc/00246/35693/34201.pdf |
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