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See detailBranchial chamber tissues in two caridean shrimps: the epibenthic Palaemon adspersus and the deep-sea hydrothermal Rimicaris exoculata
Martinez, A. S.; Charmantier, G.; Compère, Philippe ULg et al

in Tissue & Cell (2005), 37(2), 153-165

The structure of the epithelia of the branchial chamber organs (gills, branchiostegites, epipodites) and the localization of the Na2+,K2+-ATPase were investigated in two caridean shrimps, the epibenthic ... [more ▼]

The structure of the epithelia of the branchial chamber organs (gills, branchiostegites, epipodites) and the localization of the Na2+,K2+-ATPase were investigated in two caridean shrimps, the epibenthic Palaemon adspersus and the deep-sea hydrothermal Rimicaris exoculata. The general organization of the phyllobranchiate gills, branchiostegites and epipodites is similar in P. adspersus and in R. exoculata. The gill filaments are formed by a single axial epithelium made of H-shaped cells with thin lateral expansions and a basal lamina limiting hemolymph lacunae. In P. adspersus, numerous ionocytes are present in the epipodites and in the inner-side of the branchiostegites; immunofluorescence reveals their high content in Na+,K+-ATPase. In R. exoculata, typical ionocytes displaying a strong Na+,K+-ATPase specific fluorescence are observed in the epipodites only. While the epipodites and the branchiostegites appear as the main site of osmoregulation in P. adspersus, only the epipodites might be involved in ion exchanges in R. exoculata. In both species, the gill filaments are mainly devoted to respiration. (c) 2005 Elsevier Ltd. All rights reserved. [less ▲]

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See detailOpal-a Speleothems of Wei-Assipu-Tepui, Roraima Province, Brazil
Urbani, Franco; Compère, Philippe ULg; Willems, Luc ULg

in Boletín de la Sociedad Venezolana de Espeleología (2005), 39

Bol. Soc. Venezolana Espel. v.39 Caracas dic. 2005 ®download el artículo en el formato PDF Como citar este artículo Opal-a Speleothems of Wei-Assipu-Tepui, Roraima Province, Brazil Franco Urbani1 ... [more ▼]

Bol. Soc. Venezolana Espel. v.39 Caracas dic. 2005 ®download el artículo en el formato PDF Como citar este artículo Opal-a Speleothems of Wei-Assipu-Tepui, Roraima Province, Brazil Franco Urbani1, Phillipe Compère2 & Luc Willems2 1Universidad Central de Venezuela. Fac. Ingeniería. Escuela de Geología. Lab. de Geología y Geoquímica. Caracas 1053 y Sociedad Venezolana de Espeleología. Apartado 47028. Caracas 1041A. urbani@cantv.net 2Université de Liège, Laboratoire de Morphologie Ultrastructurale, Département des sciences et gestion de l'environnement, allée de la Chimie, 3, B-4000 Liège 1,Belgium. 3University of Liège. Laboratoire de Pétrologie Sédimentaire, Département de Géologie, B20, B-4000 Liege, Belgium.Lucwillems65@versateladsl.be ABSTRACT Coralloid-shaped speleothems samples were collected from a small cave in a mountain of the Roraima massif, Brazil. They were mineralogically identified as opal-A and show two concentric growth zones: A massive light colored inner one, and a darker outer zone with a spongy texture. On the surface the presence of some filaments probably of algae suggest biomineralisation. Chemically the outer zone shows impurities with high values of Cl and P. The leaching of bird nest guano may be the source of P. The two zones were probably formed in two different climatic conditions, the outer one in the current wet and vegetated period, and the inner zone during a former drier period. [less ▲]

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See detailCarste em Quartzito de Região de Diamantina : Gruta do Salitre e Parque Estadual do Rio Preto, Minas Gerais
Willems, Luc ULg; Rodet, J.; Pouclet, A. et al

Poster (2004)

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See detailChapter 3, The Integument : Morphology and Biochemistry
Compère, Philippe ULg; Jeuniaux, Charles; Goffinet, Gerhard ULg

in Forest, J.; von Vaupel Klein, J. C.; Schram, F. R. (Eds.) The Crustacea revised and updated from the Traité de Zoologie Vol 1 (2004)

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See detailDistribution of bacteria and associated minerals in the gill chamber of the vent shrimp Rimicaris exoculata and related biogeochemical processes
Zbinden, M.; Le Bris, N.; Gaill, F. et al

in Marine Ecology. Progress Series (2004), 284

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 ... [more ▼]

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 temperature data indicated that abiotic iron oxidation appears to be kinetically inhibited in the environment of the shrimps, which would explain the lack of iron oxide deposits in the first 2 compartments. We propose that iron oxidation is microbially promoted in the third area. The discrepancy between the spatial distribution of bacteria and minerals suggests that different bacterial metabolisms are involved in the first and third compartments. A possible explanation lies in the modification of physico-chemical conditions downstream of the gills that would reduce the oxygen content and favours the development of bacterial iron-oxidizers in this Fe-II-rich environment. A potential role of such iron-oxidizing symbionts in the shrimp diet is suggested. This would be unusual for hydrothermal ecosystems, in which most previously described symbioses rely on sulphide or methane as an energy source. [less ▲]

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See detailComparative degradation rates of chitinous exoskeletons from deep-sea environments
Ravaux, J.; Zbinden, M.; Voss-Foucart, M. F. et al

in Marine Biology (2003), 143(2), 405-412

Hydrothermal vent environments, particularly those associated with the vestimentiferan Riftia pachyptila, are believed to be among the highest chitin-producing systems. In order to elucidate the chitin ... [more ▼]

Hydrothermal vent environments, particularly those associated with the vestimentiferan Riftia pachyptila, are believed to be among the highest chitin-producing systems. In order to elucidate the chitin cycle in these environments, we estimate the in situ chitin degradation rates of tube-worm exoskeletons. Our in situ experiments show that the tubes of Riftia are highly stable structures. Comparative measurements of the degradation rates of Riftia tubes and crab shells immersed at deep-sea vents show that the tubes would be degraded within 2.5 years, whereas the time for the total degradation of the vent crab (Bythograea thermydron) carapaces would not exceed 36 days. The importance of the microbial participation in this degradation was estimated for Riftia tubes. Based on previous work, we calculated chitin production by a population of Riftia tubes of about 750 g m(-2) year(-1) (763). From our in situ experiments, we estimated a microbial chitinolysis rate of about 500 g m(-2) year(-1) (496) (65% of the chitin produced). Exoskeletons containing beta-chitin appear more stable in natural environments than those containing alpha-chitin and would thus be less available as carbon and nitrogen sources. In contrast, isolated beta-chitin was hydrolysed faster than alpha-chitin during in vitro degradation experiments; for instance, Riftia beta-chitin was degraded about 3- to 4-fold faster than Bythograea alpha-chitin. A stabilization process by disulfide bonds of the proteins-chitin link, rather than the crystalline form of the chitin (alpha/beta), accounts for the resistance of Riftia tubes to enzymatic attacks. [less ▲]

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See detailMineralogical gradients associated with alvinellids at deep-sea hydrothermal vents
Zbinden, M.; Le Bris, N.; Compère, Philippe ULg et al

in Deep-Sea Research Part I-Oceanographic Research Papers (2003), 50(2), 269-280

Alvinella pompejana and Alvinella caudata live in organic tubes on active sulphide chimney walls at deep-sea hydrothermal vents. These polychaete annelids are exposed to extreme thermal and chemical ... [more ▼]

Alvinella pompejana and Alvinella caudata live in organic tubes on active sulphide chimney walls at deep-sea hydrothermal vents. These polychaete annelids are exposed to extreme thermal and chemical gradients and to intense mineral precipitation. This work points out that mineral particles associated with Pompeii worm (A. pompejana and A. caudata) tubes constitute useful markers for evaluating the chemical characteristics of their micro-environment. The minerals associated with these worm tubes were analysed on samples recovered from an experimental alvinellid colony, at different locations in the vent fluid-seawater interface. Inhabited tubes from the most upper and lower parts of the colony were analysed by light and electron microscopies, X-ray microanalysis and X-ray diffraction. A change was observed from a Fe-Zn-S mineral assemblage to a Zn-S assemblage at the millimeter scale from the outer to the inner face of a tube. A similar gradient in proportions of minerals was observed at a decimeter scale from the lower to the upper part of the colony. The marcasitc/pyrite ratio of iron disulphides also displays a steep decrease along the few millimeters adjacent to the external tube surface. The occurrence of these gradients indicates that the microenvironment within the tube differs from that outside the tube, and suggests that the tube wall acts as an efficient barrier to the external environment. (C) 2003 Elsevier Science Ltd. All rights reserved. [less ▲]

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See detailCharacterization of serracin P, a phage-tail-like bacteriocin, and its activity against Erwinia amylovora, the fire blight pathogen
Jabrane, A.; Sabri, Ahmed ULg; Compère, Philippe ULg et al

in Applied and Environmental Microbiology (2002), 68(11), 5704-5710

Serratia plymithicum J7 culture supernatant displayed activity against many pathogenic strains of Erwinia amylovora,the causal agent of the most serious bacterial disease of apple and pear trees, fire ... [more ▼]

Serratia plymithicum J7 culture supernatant displayed activity against many pathogenic strains of Erwinia amylovora,the causal agent of the most serious bacterial disease of apple and pear trees, fire blight, and against Klebsiella pneumoniae, Serratia liquefaciens, Serratia marcescens, and Pseudomonas fluorescens. This activity increased significantly upon induction with mitomycin C. A phage-tail-like bacteriocin, named serracin P, was purified from an induced culture supernatant of S. plymithicum J7. It was found to be the only compound involved in the antibacterial activity against sensitive strains. The N-terminal amino acid sequence analysis of the two major subunits (23 and 43 kDa) of serracin P revealed high homology with the Fels-2 prophage of Salmonella enterica, the coliphages P2 and 168, the CTX prophage of Pseudomonas aeruginosa, and a prophage of Yersinia pestis. This strongly suggests a common ancestry for serracin P and these bacteriophages. [less ▲]

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See detailKarst in granitic rocks, South Cameroon: cave genesis and silica and taranakite speleothems
Willems, Luc ULg; Compère, Philippe ULg; Hatert, Frédéric ULg et al

in Terra Nova (2002), 14(5), 355-362

A cave in granitic rocks was studied in Mezesse, South Cameroon. Coralloid speleothems, draperies and dissolution traces on the cave walls attest to its truly karstic nature. The speleothems consist of ... [more ▼]

A cave in granitic rocks was studied in Mezesse, South Cameroon. Coralloid speleothems, draperies and dissolution traces on the cave walls attest to its truly karstic nature. The speleothems consist of microlayers of opal and taranakite (K,NH4)Al-3(PO4)(3)(OH).9H(2)O. They indicate a significant mobilization of silica, Al and K from granite during the formation of the cave. Identification of silicified bacteria in the speleothems layers suggests a possible role of these micro-organisms in silica deposition. The presence of taranakite and of silicified organic remains within the speleothems lead to a better understanding of the genesis of the cave. [less ▲]

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See detailDoes sulfide detoxication occur in the gills of the hydrothermal vent shrimp, Rimicaris exoculata?
Compère, Philippe ULg; Martinez, Anne-Sophie; Charmantier-Daures, Mireille et al

in Comptes Rendus Biologies (2002), 325

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See detailImmunocytochemistry of lipids : chemical fixatives have dramatic effects on the preservation of tissue lipids
Maneta-Peyret, Lilly; Compère, Philippe ULg; Moreau, Patrick et al

in Histochemical Journal (The) (1999), 31

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See detailSpéléothèmes des karsts siliceux du Niger et du Cameroun
Willems, Luc ULg; Compère, Philippe ULg; Sponholz, Barbara et al

in Géosciences au Cameroun & collection Géocam (1998), 1

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See detailStudy of siliceous karst genesis in Eastern Niger. Microscopy and analysis of speleothems
Willems, Luc ULg; Compère, Philippe ULg; Sponholz, Barbara

in Zeitschrift für Geomorphologie (1998), 42(2), 129-142

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See detailUltrastructure and cytochemistry of the early calcification site and of its mineralizing organic matrix in Paracentrotus lividus (Echinodermata: Echinoidea)
Amaye, Laurent; Compère, Philippe ULg; Dubois, Philippe

in Histochemistry & Cell Biology (1998), 110

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See detailStudy of siliceous karst genesis in eastern Niger : microscopy and X ray microanalysis of speleothems
Willems, Luc; Compère, Philippe ULg; Sponholz, Barbara

in Zeitschrift für Geomorphologie (1998), 42

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See detail"Exolysosomes", Enzyme-Containing Vesicles in the Ecdysial Space of Molting Crabs
Compère, Philippe ULg; Bouchtia, Hicham; Thiry, Marc ULg et al

in Journal of Structural Biology (1997), 119(3), 247-59

Free vesicle-like bodies (VLBs) present in the ecdysial space of cuticle regions undergoing degradation during preecdysis of the Atlantic shore crab Carcinus maenas have been interpreted either as ... [more ▼]

Free vesicle-like bodies (VLBs) present in the ecdysial space of cuticle regions undergoing degradation during preecdysis of the Atlantic shore crab Carcinus maenas have been interpreted either as infectious organisms or as secretion structures associated with degradation of the old cuticle. Ultrastructural, cytochemical, and immunocytological investigations were performed to test these hypotheses and to see whether VLBs are peculiar to this crab species. Similar VLBs were systematically found in two other preecdysial crabs, Cancer pagurus and Macropipus puber. In Car, maenas, they originate during early premolt inside Golgi buddings and are often gathered into large vacuoles in epidermal cells. The histochemical azo-dye technique and a cerium-based cytochemical method revealed acid phosphatase activity in both the ecdysial space and the VLBs, while Feulgen's method and immunocytological labeling always failed to reveal any DNA or RNA in either the ecdysial space or the VLBs. We conclude that VLBs are not infectious organisms but "extracellular" cuticle-degrading organelles of lysosomal origin and propose to coin them "exolysosomes." [less ▲]

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See detailOn endostyle ultrastructure in two new species of doliolid-like tunicates
Compère, Philippe ULg; Godeaux, Jean

in Marine Biology (1997), 128

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