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Author Ntienoue, J.K.; Reguer, A.; Robert, F.; Nait-Rabah, O.; Roos, C.
Title Electrochemical behaviour of a super austenitic stainless steel in amazonian aqueous environment Type Journal Article
Year 2013 Publication International Journal of Electrochemical Science Abbreviated Journal Int.J.Electrochem.Sci.
Volume 8 Issue 4 Pages 4761-4775
Keywords Cyclic voltammetry; Eis; Esem; Passive films; Stainless steel
Abstract The electrochemical behaviour of 254 SMO super austenitic stainless steel in natural seawater collected from river mouth of French Guiana was investigated. A comparative study of samples immersed during 22 days in this environment was made including influences of scraped biofilm introduced in experiments and of stirring. Electrochemical measurements – open circuit potential (OCP), electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV) and linear polarisation (LP) – are used to characterize the metal/medium interface included biofilms adhesion. The EDX analysis (EDAX system) shows that the chemical composition of adhered biofilm consists mostly of iron, oxygen, silicon and aluminium and seem preferentially bind on metal defects. © 2013 by ESG.
Address Laboratoire Matériaux et Molécules en Milieu Amazonien, Université des Antilles et de la Guyane, UAG-UMR ECOFOG, Campus Trou Biran, Cayenne 97337, French Guiana
Corporate Author Thesis
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ISSN (down) 14523981 (Issn) ISBN Medium
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Notes Export Date: 24 April 2013; Source: Scopus; Language of Original Document: English; Correspondence Address: Roos, C.; Laboratoire Matériaux et Molécules en Milieu Amazonien, Université des Antilles et de la Guyane, UAG-UMR ECOFOG, Campus Trou Biran, Cayenne 97337, French Guiana; email: christophe.roos@guyane.univ-ag.fr Approved no
Call Number EcoFoG @ webmaster @ Serial 483
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Author Lebrini, M.; Robert, F.; Roos, C.
Title Inhibition Effect of Alkaloids Extract from Annona Squamosa Plant on the Corrosion of C38 Steel in Normal Hydrochloric Acid Medium Type Journal Article
Year 2010 Publication International Journal of Electrochemical Science Abbreviated Journal Int. J. Electrochem. Sci.
Volume 5 Issue 11 Pages 1698-1712
Keywords Plant extract; corrosion inhibitors; C38 steel; acidic media; adsorption
Abstract In this work, an alkaloids extract from Annona squamosa plant have been studied as possible corrosion inhibitor for C38 steel in molar hydrochloric acid (1 M HCl). Potentiodynamic polarization and AC impedance methods have been used. The corrosion inhibition efficiency increases on increasing plant extract concentration. Polarisation studies showed that Annona squamosa extract was mixed-type inhibitor in 1 M HCl. The inhibition efficiency of Annona squamosa extract was temperature-dependent and its addition led to an increase of the activation corrosion energy revealing a physical adsorption between the extract and the metal surface. The adsorption of the Annona squamosa extract followed Langmuir's adsorption isotherm. The inhibitive effect of Annona squamosa is ascribed to the presence of organic compounds in the extract. The examined extract is considered as non-cytotoxic substance.
Address [Lebrini, M.] CNRS 8172 UMR ECOFOG, Lab Mat & Mol Milieu Amazonien, Cayenne 97337, French Guiana, Email: florent.robert@guyane.univ-ag.fr
Corporate Author Thesis
Publisher ELECTROCHEMICAL SCIENCE GROUP Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN (down) 1452-3981 ISBN Medium
Area Expedition Conference
Notes ISI:000283999000015 Approved no
Call Number EcoFoG @ eric.marcon @ Serial 20
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Author Lebrini, M.; Robert, F.; Roos, C.
Title Alkaloids Extract from Palicourea guianensis Plant as Corrosion Inhibitor for C38 Steel in 1 M Hydrochloric Acid Medium Type Journal Article
Year 2011 Publication International Journal of Electrochemical Science Abbreviated Journal Int. J. Electrochem. Sci.
Volume 6 Issue 3 Pages 847-859
Keywords Palicourea guianensis; corrosion inhibitors; C38 steel; acidic media; adsorption
Abstract Corrosion inhibition effect of alkaloids extract from Palicourea guianensis plant (AEPG) on C38 tell in 1 M HCl medium has been investigated by potentiodynamic polarization and electrochemical impedance spectroscopy. The polarization studies that AEPG acts as mixed-type inhibitor. The electrochemical impedance spectroscopy showed that the charge transfer resistance increases and the double layer capacitance decreases on increasing plant extract concentration. The inhibition efficiency of the extract obtained from impedance and polarization measurements was in a good agreement and was found to increase with increasing concentration of the extract. Inhibition efficiency of 89% was achieved with 100 mg L-1 of AEPG at 25 degrees C. The obtained results showed that, the Palicourea guianensis extract could serve as an effective inhibitor for the corrosion of steel in acid media. The adsorption of AEPG obeys the Langmuir adsorption isotherm.
Address [Lebrini, M.; Robert, F.; Roos, C.] UAG UMR ECOFOG, Lab Mat & Mol Milieu Amazonien, Cayenne 97337, French Guiana, Email: florent.robert@guyane.univ-ag.fr
Corporate Author Thesis
Publisher Electrochemical Science Group Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN (down) 1452-3981 ISBN Medium
Area Expedition Conference
Notes ISI:000287820500026 Approved no
Call Number EcoFoG @ webmaster @ Serial 298
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Author Lebrini, M.; Robert, F.; Blandinieres, P.A.; Roos, C.
Title Corrosion Inhibition by Isertia coccinea Plant Extract in Hydrochloric Acid Solution Type Journal Article
Year 2011 Publication International Journal of Electrochemical Science Abbreviated Journal Int. J. Electrochem. Sci.
Volume 6 Issue 7 Pages 2443-2460
Keywords Isertia coccinea; corrosion inhibitors; C38 steel; acidic media; adsorption
Abstract The effect of alkaloids extracted from Isertia coccinea plant (AEIC) on the corrosion of C38 steel in 1 M hydrochloric acid was investigated by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization techniques. Potentiodynamic polarization curves indicated that the extract behave as mixed-type inhibitor. The experimental data obtained from EIS method show a frequency distribution and therefore a modelling element with frequency dispersion behaviour, a constant phase element (CPE) has been used. The inhibition efficiencies of the extract calculated by three methods show the same tendency. Inhibition was found to increase with increasing concentration of the plant extract. The results obtained show that the extract solution of the plant could serve as an effective inhibitor for the corrosion of C38 steel in hydrochloric acid solution. The apparent activation energy of the process taking place in inhibitor presence was determined on the ground of four temperature values in the range from 25 degrees C to 55 degrees C using the data obtained by two independent methods. Theoretical fitting of different isotherms, Langmuir, Temkin and Frunkin, were tested to clarify the nature of adsorption.
Address [Lebrini, M.; Robert, F.; Blandinieres, P. A.; Roos, C.] UAG UMR ECOFOG, Lab Mat & Mol Milieu Amazonien, Cayenne 97337, French Guiana, Email: florent.robert@guyane.univ-ag.fr
Corporate Author Thesis
Publisher Electrochemical Science Group Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN (down) 1452-3981 ISBN Medium
Area Expedition Conference
Notes ISI:000292331400014 Approved no
Call Number EcoFoG @ webmaster @ Serial 324
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Author Coste, S.; Roggy, J.C.; Sonnier, G.; Dreyer, E.
Title Similar irradiance-elicited plasticity of leaf traits in saplings of 12 tropical rainforest tree species with highly different leaf mass to area ratio Type Journal Article
Year 2010 Publication Functional Plant Biology Abbreviated Journal Funct. Plant Biol.
Volume 37 Issue 4 Pages 342-355
Keywords functional diversity; light availability; photosynthetic nitrogen use efficiency; photosynthetic capacity; tropical rainforest
Abstract Leaf traits of tropical tree species display an important inter-specific diversity, as detected for instance in the large range of values of leaf mass : area ratio (LMA). They also demonstrate a large irradiance-elicited plasticity, but there is still debate whether this plasticity differs among species. To address this question, leaf traits were recorded on saplings from 12 rainforest tree species in French Guiana, grown under approximately 5, 10 and 20% relative irradiance. Fifteen structural and physiological leaf traits related to photosynthesis were measured. The irradiance-elicited plasticity was quantified using a relative distance plasticity index. A large inter-specific diversity was detected for all leaf traits. A principal component analysis opposed species with a large mass-based photosynthesis, respiration, N content and photosynthetic nitrogen use efficiency, to species with a large leaf mass : area ratio, LMA. The two pioneer species used in this study displayed the largest photosynthetic capacity (and lowest LMA) and ranked at one end of the species continuum. Relative irradiance affected almost all traits with the exception of mass-based photosynthesis. A weak interaction was found between species and relative irradiance and the species ranking was maintained among relative irradiance treatments for the majority of the traits. A principal component analysis of the values of relative-distance plasticity index failed to reveal any consistent patterns of traits or species. We concluded that irradiance-elicited plasticity of leaf traits was similar among species irrespective of LMA and successional status, despite the occurrence of a large inter-specific diversity for the investigated traits.
Address [Dreyer, Erwin] Nancy Univ, INRA, UMR Ecol & Ecophysiol Forestieres 1137, IFR Ecosyst Forestiers Agroressources Biomol & Al, F-54280 Champenoux, France, Email: dreyer@nancy.inra.fr
Corporate Author Thesis
Publisher CSIRO PUBLISHING Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN (down) 1445-4408 ISBN Medium
Area Expedition Conference
Notes ISI:000275979100009 Approved no
Call Number EcoFoG @ eric.marcon @ Serial 63
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Author Fromin, N.; Porte, B.; Lensi, R.; Hamelin, J.; Domenach, A.-M.; Buatois, B.; Roggy, J.-C.
Title Spatial variability of the functional stability of microbial respiration process: A microcosm study using tropical forest soil Type Journal Article
Year 2012 Publication Journal of Soils and Sediments Abbreviated Journal J. Soils Sed.
Volume 12 Issue 7 Pages 1030-1039
Keywords Disturbance; Diversity-stability relationship; Microbial diversity; Substrate-induced respiration
Abstract Purpose: Understanding the ability of ecosystem processes to resist to and to recover from disturbances is critical to sustainable land use. However, the spatial variability of the stability has rarely been addressed. Here, we investigated the functional stability of a soil microbial process for 24 soils collected from adjacent locations from a 0. 3 ha tropical rainforest plot in Paracou, French Guiana. Materials and methods: The 24 locations were characterized regarding soil chemical and biological (microbial diversity) parameters and forest structure. The corresponding soils were submitted to an experimental transient heat disturbance during a microcosm experiment. The response of the respiration process was followed using substrate-induced respiration (SIR). Results and discussion: The response of soil SIR to heat disturbance varied widely between samples. The variability of the SIR response increased just after the disturbance, and a global rather homogeneous decrease in SIR rates was observed 15 and 30 days after. The stability of SIR in response to heat disturbance could not be related to either the genetic or the metabolic diversity of the microbial community. The initial level of SIR before the disturbance was the soil variable that best correlated with the impact of the disturbance: the soil locations with the highest initial SIR rates were the most affected 15 and 30 days after the heat disturbance. Conclusions: Such a heterogeneous response suggests that the response of soil processes to a disturbance will be difficult to assess from only local-scale analyses and highlights the need for spatial explicitness in understanding biogeochemical processes. © 2012 Springer-Verlag.
Address UMR EcoFoG, BP 709, 97387 Kourou, French Guiana
Corporate Author Thesis
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ISSN (down) 14390108 (Issn) ISBN Medium
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Notes Export Date: 30 July 2012; Source: Scopus; doi: 10.1007/s11368-012-0528-7; Language of Original Document: English; Correspondence Address: Fromin, N.; CEFE, CNRS UMR 5175, 1919 Route de Mende, 34293 Montpellier cedex 5, France; email: nathalie.fromin@cefe.cnrs.fr Approved no
Call Number EcoFoG @ webmaster @ Serial 415
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Author Duplais, C.; Estevez, Y.
Title Tandem Biocatalysis Unlocks the Challenging de Novo Production of Plant Natural Products Type Journal Article
Year 2017 Publication ChemBioChem Abbreviated Journal ChemBioChem
Volume 18 Issue 22 Pages 2192-2195
Keywords alkaloids; biosynthesis; enzyme catalysis; protein engineering; terpenes
Abstract Intimate partnership: Knowledge of the biocatalytic cascades in different cellular compartments is limited, but deciphering these systems in nature can be used to inspire synthetic strategies. Two studies report new insights into the biosynthesis of alkaloids and sesterterpenoids in plants. This highlight presents these novel biotransformations to illustrate how tandem biocatalysis can impact the future of natural product production.
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ISSN (down) 1439-7633 ISBN Medium
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Notes Approved no
Call Number EcoFoG @ webmaster @ Serial 780
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Author Dejean, A.; Djieto-Lordon, C.; Cereghino, R.; Leponce, M.
Title Ontogenetic succession and the ant mosaic: An empirical approach using pioneer trees Type Journal Article
Year 2008 Publication Basic and Applied Ecology Abbreviated Journal Basic Appl. Ecol.
Volume 9 Issue 3 Pages 316-323
Keywords ant-plant relationships; dynamics of associations; myrmecophytes; species turnover; tropical rainforests
Abstract Arboreal ant mosaics have been intensively investigated, but what generates these mosaics remains poorly understood. In this paper, we hypothesize that the dynamics of arboreal ant mosaics could be better understood by examining the ontogenetic succession of ants in tropical trees. We used three African pioneer tree species as biological models. Lophira alata (Ochnaceae) is a long-lived species that does not furnish any reward (i.e., extra-floral nectaries [EFNs], shelter) to ants, Anthocleista vogelii (Gentianaceae) bears extremely well-developed EFNs, and Barteria fistulosa (Passifloraceae) is a long-lived myrmecophyte providing both EFNs and domatia. For both L. alata and A. vogelii, we noted a succession of different associated ants as the plants grew and aged. Ground-nesting, arborealforaging ant species were the first associates, followed by arboreal species that build nests with the leaves of their host trees, together with some species nesting opportunistically in pre-existing cavities. Carton-building Crematogaster species were the last in this succession. The presence of EFNs on A. vogelii slows species turnover, demonstrating that the plant exerts some control over its ant associates. The comparison with B. fistulosa, which generally remains associated with the same plant-ant species during its entire ontogeny, highlights the importance of the selective attractiveness of the trees for their associated ants – or, perhaps, the existence of plant filters that screen arriving ants. (C) 2007 Gesellschaft fur Okologie. Published by Elsevier GmbH. All rights reserved.
Address [Dejean, Alain] CNRS Guyane, UPS 2561, F-97300 Cayenne, France, Email: alain.dejean@wanadoo.fr
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Publisher ELSEVIER GMBH, URBAN & FISCHER VERLAG Place of Publication Editor
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ISSN (down) 1439-1791 ISBN Medium
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Notes ISI:000256734600013 Approved no
Call Number EcoFoG @ eric.marcon @ Serial 138
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Author Carrias, J.-F.; Céréghino, R.; Brouard, O.; Pélozuelo, L.; Dejean, A.; Couté, A.; Corbara, B.; Leroy, C.
Title Two coexisting tank bromeliads host distinct algal communities on a tropical inselberg Type Journal Article
Year 2014 Publication Plant Biology Abbreviated Journal Plant Biol.
Volume 16 Issue 5 Pages 997-1004
Keywords Algae; Bromeliaceae; Inselberg; Neotropics; Phytotelmata; Aechmea; algae; Bromeliaceae; Bumilleriopsis; Catopsis berteroniana; Chlorella (unclassified Chlorophyceae); Chlorella (unclassified Trebouxiophyceae); Chlorella sp.; Cyanobacteria; Eukaryota; Invertebrata; Protozoa
Abstract The tank bromeliads Aechmea aquilega (Salisb.) and Catopsis berteroniana (Schultes f.) coexist on a sun-exposed Neotropical inselberg in French Guiana, where they permit conspicuous freshwater pools to form that differ in size, complexity and detritus content. We sampled the algal communities (both eukaryotic and cyanobacterial taxa, including colourless forms) inhabiting either A. aquilega (n = 31) or C. berteroniana (n = 30) and examined differences in community composition and biomass patterns in relation to several biotic and abiotic variables. Chlorella sp. and Bumilleriopsis sp. were the most common taxa and dominated the algal biomass in A. aquilega and C. berteroniana, respectively. Using a redundancy analysis, we found that water volume, habitat complexity and the density of phagotrophic protozoa and collector-gatherer invertebrates were the main factors explaining the distribution of the algal taxa among the samples. Hierarchical clustering procedures based on abundance and presence/absence data clearly segregated the samples according to bromeliad species, revealing that the algal communities in the smaller bromeliad species were not a subset of the communities found in the larger bromeliad species. We conclude that, even though two coexisting tank bromeliad populations create adjacent aquatic habitats, each population hosts a distinct algal community. Hence, bromeliad diversity is thought to promote the local diversity of freshwater algae in the Neotropics. © 2014 German Botanical Society and The Royal Botanical Society of the Netherlands.
Address IRD, UMR AMAP (botAnique et bioinforMatique de l'Architecture des Plantes), Montpellier, France
Corporate Author Thesis
Publisher Blackwell Publishing Ltd Place of Publication Editor
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ISSN (down) 14388677 (Issn) ISBN Medium
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Notes Export Date: 2 September 2014; Coden: Pbiof; Correspondence Address: Carrias, J.-F.; Clermont Université, Université Blaise Pascal, BP 10448, F-63000 Clermont-Ferrand, France; email: j-francois.carrias@univ-bpclermont.fr; Funding Details: LQ13C020005, NSFC, National Natural Science Foundation of China Approved no
Call Number EcoFoG @ webmaster @ Serial 560
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Author Leroy, C.; Petitclerc, F.; Orivel, J.; Corbara, B.; Carrias, J.-F.; Dejean, A.; Céréghino, R.
Title The influence of light, substrate and seed origin on the germination and establishment of an ant-garden bromeliad Type Journal Article
Year 2017 Publication Plant Biology Abbreviated Journal Plant Biol J
Volume 19 Issue 1 Pages 70-78
Keywords Aechmea mertensii; bromeliad; French Guiana; germination; plant performance; survival
Abstract Plant germination and development depend upon a seed's successful dispersal into a suitable habitat and its ability to grow and survive within the surrounding biotic and abiotic environment. The seeds of Aechmea mertensii, a tank-bromeliad species, are dispersed by either Camponotus femoratus or Neoponera goeldii, two ant species that initiate ant gardens (AGs). These two mutualistic ant species influence the vegetative and reproductive traits of the bromeliad through their divergent ecological preferences (i.e. light and substrate). We hypothesised that the seeds dispersed by these two ant species have underlying genetic differences affecting germination, growth and survival of A. mertensii seedlings in different ways. To test this, we used an experimental approach consisting of sowing seeds of A. mertensii: (i) taken from the two AG–ant associations (i.e. seed origin), (ii) in two contrasting light conditions, and (iii) on three different substrates. Light and substrate had significant effects on germination, survival and on eight key leaf traits reflecting plant performance. Seed origin had a significant effect only on germination and on two leaf traits (total dry mass and relative growth rate). Overall, this bromeliad performs better (i.e. high growth and survival rates) when growing both in the shade and in the carton nest developed by C. femoratus ants. These results suggest that the plasticity of the tank bromeliad A. mertensii is mainly due to environment but also to genetic differences related to seed origin, as some traits are heritable. Thus, these two ant species may play contrasting roles in shaping plant evolution and speciation.
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ISSN (down) 1438-8677 ISBN Medium
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Notes Approved no
Call Number EcoFoG @ webmaster @ Serial 712
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