Consulta: creatorFacets:"Gaill, F"
Registros recuperados: 13
Data/hora: 09/06/2024 11:43:55

Cuticle structure and composition of two invertebrates of hydrothermal vents: Alvinella pompejana and Riftia pachyptila
Provedor de dados: 5
Autores: Gaill, F; Herbage, D; Lepescheux, L.
The structure of the cuticle from the "Pompeii worm" Alvinella pompejana and Riftia pachyptila is presented. The cuticle structure of Alvinella is similar to that of other annelid species, whereas that of Riftia presents patterns which are observed in biological analogues of cholesteric liquid crystals. The amino acid composition of a vestimentiferan cuticle is presented for the first time and compared with that of other invertebrates.
Tipo: Text
Ano: 1988
URL: http://archimer.ifremer.fr/doc/00267/37812/35893.pdf

New insigths on the metabolic diversity among the epibiotic microbial communitiy of the hydrothermal shrimp Rimicaris exoculata
Provedor de dados: 5
Autores: Zbinden, M; Shillito, B; Le Bris, Nadine; De Montlaur, C; Roussel, Erwan; Guyot, F; Gaill, F; Cambon-bonavita, Marie-anne.
The Rimicaris exoculata dominates the megafauna of some of the Mid Atlantic ridge hydrothermal vent sites. This species harbors a rich community of bacterial epibionts inside its gill chamber. Literature data indicate that a single 16S rRNA phylotype dominates this epibiotic community, and is assumed to be a sulfide-oxidizing bacteria. However attempts Of Cultivation were not successful and did not allow to confirm it. The aim of our study was to test the hypothesis of sulfide oxidation in the gill chamber, by a multidisciplinary approach, using in vivo experiments at in situ pressure in the presence of sulfide, microscopic observations and a molecular survey. Morphology of microorganisms, before and after treatment, was analyzed to test the effect of...
Tipo: Text
Palavras-chave: Sulfur; Methane; Iron; Intracellular granules; Hydrothermal vent shrimp; High pressure experiments.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4563.pdf

Relationships between the "Pompeii worms" and their epibiotic bacteria
Provedor de dados: 5
Autores: Gaill, F; Desbruyeres, D; Laubier, L.
The morphological relationship between the so-called "Pompeii worms" (Alvinella caudata and Alvinella pompejana ) and their associated bacteria is described. The results permit an overview of the possible functioning of the biological ensemble constituted by the worm, its tube and the associated bacteria.
Tipo: Text
Ano: 1988
URL: http://archimer.ifremer.fr/doc/00267/37799/35880.pdf

Transfert, accumulation et regulation des elements mineraux chez les organismes des sources hydrothermales
Provedor de dados: 5
Autores: Cosson-mannevy, M-a; Cosson, R P; Gaill, F; Laubier, L.
Specimens of Riftia pachyptila and Alvinella pompejana were collected during the Biocyarise expedition to hydrothermal vents on the East Pacific Rise at 13 degree N. Quantitative data describing the concentrations of metals in Riftia pachyptila showed that numerous metals are highly concentrated. Analyses of tissues reveal that the plume and the trophosome are the main sites of metal accumulation. Bioconcentration links with the mineral composition of the vent environment are discussed. Mechanisms for metal detoxication were investigated in both species: the presence of metal-rich granules and metallothionein-like proteins were observed. The role of chemolithotrophic bacteria in these mechanisms is discussed.
Tipo: Text
Ano: 1988
URL: http://archimer.ifremer.fr/doc/00267/37830/35911.pdf

Ultrastructural characteristics of Alvinella pompejana associated bacteria
Provedor de dados: 5
Autores: Gulik, A; Gaill, F.
A freeze fracture morphological study of Alvinella pompejana associated epibiotic bacteria has confirmed the large variety of bacterial species already observed by scanning and thin section transmission electron microscopy. Freeze-fracture reveals striking differences in the membrane structure: The usual fracture along the hydrophobic part of the membrane for some bacteria, but only an unusual cross-fracture through the membrane for others. This suggests that some bacteria contain non-fracturable lipids typical of certain archaebacteria.
Tipo: Text
Ano: 1988
URL: http://archimer.ifremer.fr/doc/00267/37788/35869.pdf

Influence of environmental conditions on early development of the hydrothermal vent polychaete Alvinella pompejana
Provedor de dados: 5
Autores: Pradillon, F; Le Bris, Nadine; Shillito, B; Young, C; Gaill, F.
Dispersal and colonisation processes at deep-sea vents are still not fully understood, essentially because early life stages of vent species remain unknown. The polychaete worm Alvinella pompejana forms colonies on chimney walls at East Pacific Rise vent sites where the temperature can frequently exceed 20 degrees C. In vitro studies in pressure vessels showed that the early embryos tolerate temperatures in a lower range (10-14 degrees C), suggesting that they would have to escape the colony to develop. Pressure vessels offer the advantage that each parameter can be independently controlled, but they do not simulate the more complex and dynamic conditions naturally encountered at vent sites. Accordingly, in addition to incubations in pressure vessels, we...
Tipo: Text
Palavras-chave: Environmental condition; H2S; Temperature tolerance; Polychaete; Pressure vessel; Embryo; Development; Hydrothermal vent.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-600.pdf

Temperature resistance studies on the deep-sea vent shrimp Mirocaris fortunata
Provedor de dados: 5
Autores: Shillito, B; Le Bris, Nadine; Hourdez, S; Ravaux, J; Cottin, D; Caprais, Jean-claude; Jollivet, D; Gaill, F.
The shrimp Mirocaris fortunata is a hydrothermal vent species that is found at most vent-sites along the Mid-Atlantic Ridge. This endemic species is found across a hydrothermal gradient, with thermal conditions ranging from 2-9 degrees C in ambient seawater to fairly warm values of about 25 degrees C. We performed in vivo experiments on M. fortunata specimens originating from different sites and depths (850 m to 2300 m), both at atmospheric pressure and in pressurized aquaria, to characterise the upper thermal limits of this species. Atmospheric pressure results show that thermal physiology should be studied at each population's native pressure. At in situ pressure, shrimps from Menez Gwen (850 m depth) and Lucky Strike (1700 m depth) do not survive...
Tipo: Text
Palavras-chave: IPOCAMP TM; Crustacea; Mirocaris fortunata; Thermal stress; Hydrothermal vent.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-1240.pdf

Unexpected co-occurrence of six bacterial symbionts in the gills of the cold seep mussel Idas sp (Bivalvia : Mytilidae)
Provedor de dados: 5
Autores: Duperron, Sebastien; Halary, S; Lorion, J; Sibuet, Myriam; Gaill, F.
Bathymodioline mussels occur in chemosynthesis-based ecosystems such as cold seeps, hydrothermal vents and organic debris worldwide. Their key adaptation to these environments is their association with bacterial endosymbionts which ensure a chemosynthetic primary production based on the oxidation of reduced compounds such as methane and sulfide. We herein report a multiple symbiosis involving six distinct bacterial 16S rRNA phylotypes, including two belonging to groups not yet reported as symbionts in mytilids, in a small Idas mussel found on carbonate crusts in a cold seep area located north to the Nile deep-sea fan (Eastern Mediterranean). Symbionts co-occur within hosts bacteriocytes based on fluorescence in situ hybridizations, and sequencing of...
Tipo: Text
Palavras-chave: Eastern Mediterranean; Cold seeps; Bathymodiolus; Idas; Mytilidae; Symbiosis.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-3928.pdf

Iron oxide deposits associated with the ectosymbiotic bacteria in the hydrothermal vent shrimp Rimicaris exoculata
Provedor de dados: 5
Autores: Corbari, L; Cambon-bonavita, Marie-anne; Long, G; Grandjean, F; Zbinden, M; Gaill, F; Compere, P.
The Rimicaris exoculata shrimp is considered as a primary consumer that dominates the fauna of most Mid-Atlantic Ridge ( MAR) hydrothermal ecosystems. These shrimps harbour in their gill chambers an important ectosymbiotic community of chemoautotrophic bacteria associated with iron oxide deposits. The structure and elemental composition of the mineral concretions associated with these bacteria have been investigated by using LM, ESEM, TEM STEM and EDX microanalyses. The nature of the iron oxides in shrimps obtained from the Rainbow vent field has also been determined by Mossbauer spectroscopy. This multidisciplinary approach has revealed that the three layers of mineral crust in the Rimicaris exoculata shrimps consist of large concretions formed by...
Tipo: Text
Palavras-chave: Mid atlantic ridge; Deep sea; Microbial communities; Oxidizing bacteria; Trophic ecology; Ferrous ions; Fe oxides; Ferrihydrite; Biomineralization; Minerals.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4702.pdf

Distribution of bacteria and associated minerals in the gill chamber of the vent shrimp Rimicaris exoculata and related biogeochemical processes
Provedor de dados: 5
Autores: Zbinden, M; Le Bris, Nadine; Gaill, F; Compere, P.
The shrimp Rimicaris exoculata dominates the megafauna of some Mid-Atlantic Ridge hydrothermal vent fields. This species harbours a rich bacterial epibiosis inside its gill chamber. At the 'Rainbow' vent site (36degrees 14.0'N), the epibionts are associated with iron oxide deposits. Investigation of both bacteria and minerals by scanning electron microscopy (SEM) and X-ray microanalysis (EDX) revealed 3 distinct compartments in the gill chamber: (1) the lower pre-branchial chamber, housing bacteria but devoid of minerals; (2) the 'true' branchial chamber, containing the gills and devoid of both bacteria and minerals; and (3) the upper pre-branchial chamber, housing the main ectosymbiotic bacterial community and associated mineral deposits. Our chemical and...
Tipo: Text
Palavras-chave: Crustacea; Deep sea; Moulting cycle; Biomineralisation; Symbiosis; Iron oxidation.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/00000/10919/7584.pdf

Interactions of deep-sea vent invertebrates with their environment: The case of Rimicaris exoculata
Provedor de dados: 5
Autores: Schmidt, Caroline; Le Bris, Nadine; Gaill, F.
The vent shrimp Rimicaris exoculata thrives around many hydrothermal vent sites along the Mid-Atlantic Ridge (MAR), where it aggregates into dense swarms. In contrast to hydrothermal vent fields at the East Pacific Rise (EPR), where the biomass is dominated by tubeworms, clams, and mussels, this shrimp is one of the major animal species at MAR vents. These animals are found in the dynamic mixing interface between cold oxygenated seawater and hot, reduced hydrothermal vent fluid. The adaptation of this shrimp to the hostile deep-sea hydrothermal environment and its survival strategy has been investigated since their discovery at the TAG site in the late 1980s. Rimicaris exoculata is now known to colonize black smoker complexes along the MAR in the...
Tipo: Text
Palavras-chave: Extreme environments; Microorganisms; Chemosynthesis; Biomineralization; Symbiosis; Deep sea; Hydrothermal vents; Mid Atlantic Ridge; Shrimp.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-3925.pdf

Bacterial communities associated with "Pompei worms" from the East Pacific rise hydrothermal vents: SEM, TEM observations
Provedor de dados: 5
Autores: Gaill, F; Desbruyeres, Daniel; Prieur, D.
A morphological study of bacteria associated with the “Pompei worm,”Alvinella pompejana, collected from East Pacific rise hydrothermal vents, revealed four types of epidermal associations on the dorsal part of the animals: various single cells distributed on the animal tegument; clump-like associations located in the intertegumentary spaces; and filamentous bacteria associated with epidermal expansions, or inserted on the posterior parapodia. The bacterial morphologies were illustrated by SEM and TEM pictures and compared to bacteria previously described. The functional significance of these associations is discussed.
Tipo: Text
Ano: 1987
URL: http://archimer.ifremer.fr/doc/00155/26658/24855.pdf

Thermal biology of the deep-sea vent annelied Paralvinella grasslei: in vivo studies
Provedor de dados: 5
Autores: Cottin, D; Ravaux, J; Leger, N; Halary, S; Toullec, J; Sarradin, Pierre-marie; Gaill, F; Shillito, B.
The annelid Paralvinella grasslei is a deep-sea vent endemic species that colonizes the wall of active chimneys. We report here the first data on its thermal biology based on in vivo experiments in pressurized aquaria. Our results demonstrate that P. grasslei survives a 30 min exposure at 30 degrees C, and suggest that the upper thermal limit of this species is slightly above this temperature. The first signs of stress were noticed at 30 C, such as a significant increase in the animal's activity and the expression of HSP70 stress proteins. A preliminary investigation of the kinetics of stress protein expression surprisingly showed high levels of HSP70 proteins as late as 3.5 h after the heat shock. Finally, we provide here the first sequences for vent...
Tipo: Text
Palavras-chave: IPOCAMP; Annelids; Heat stress; Stress response; Heat shock proteins; Hydrothermal vents.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4570.pdf