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Vastra, M.; Salvin, P.; Roos, C. |
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Title |
MIC of carbon steel in Amazonian environment: Electrochemical, biological and surface analyses |
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Journal Article |
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2016 |
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International Biodeterioration and Biodegradation |
Abbreviated Journal |
International Biodeterioration and Biodegradation |
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112 |
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98-107 |
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Biology; Electrochemistry; Mic; Short term; Surface analyses |
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In this study, the corrosion of S355 carbon steel was monitored for 50 days in equatorial environment. The experiments were conducted under three complementary approaches in a natural environment: (i) bacterial diversity was assessed with Miseq sequencing, (ii) observations of the surface and identifications of deposit compounds were realised with scanning electron microscopy (SEM), Raman spectrometry and EDX analyses, (iii) electrochemical measurements were used to calculate corrosion rate and to identify the phenomena which control corrosion. The results showed that the bacterial population had changed over immersion time from a dominance of β-proteobacteria to α-proteobacteria. This evolution decreased charge transfer resistance at the metal/deposit from 41.6 to 20.8 Ω/cm2 in 50 days, caused an increase in the corrosion rate by a factor of 2, from 0.13 to 0.27 mm/year. Surface analyses showed a progressive appearance of MIC markers in the deposit such as iron sulphide and manganese oxides that were detected after 30 days of immersion in the natural environment. In conclusion, this study describes in detail, the first stage of MIC activity on carbon steel surface in an equatorial brackish water, under aerobic conditions. © 2016 Elsevier Ltd. |
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Laboratoire des Matériaux et Molécules en Milieu Agressif, Université des Antilles, UMR ECOFOG, Campus Universitaire, Schœlcher, Martinique |
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Export Date: 1 June 2016 |
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EcoFoG @ webmaster @ |
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681 |
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Leba, L.-J.; Popovici, J.; Estevez, Y.; Pelleau, S.; Legrand, E.; Musset, L.; Duplais, C. |
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Antiplasmodial activities of dyes against Plasmodium falciparum asexual and sexual stages: Contrasted uptakes of triarylmethanes Brilliant green, Green S (E142), and Patent Blue V (E131) by erythrocytes |
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Journal Article |
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2017 |
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International Journal for Parasitology: Drugs and Drug Resistance |
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International Journal for Parasitology: Drugs and Drug Resistance |
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7 |
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3 |
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314-320 |
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Antimalarial dyes; Brilliant green; Drug uptake; Food dyes; Transmission blocking; Triarylmethanes |
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The search for safe antimalarial compounds acting against asexual symptom-responsible stages and sexual transmission-responsible forms of Plasmodium species is one of the major challenges in malaria elimination programs. So far, among current drugs approved for human use, only primaquine has transmission-blocking activity. The discovery of small molecules targeting different Plasmodium falciparum life stages remains a priority in antimalarial drug research. In this context, several independent studies have recently reported antiplasmodial and transmission-blocking activities of commonly used stains, dyes and fluorescent probes against P. falciparum including chloroquine-resistant isolates. Herein we have studied the antimalarial activities of dyes with different scaffold and we report that the triarylmethane dye (TRAM) Brilliant green inhibits the growth of asexual stages (IC50 ≤ 2 μM) and has exflagellation-blocking activity (IC50 ≤ 800 nM) against P. falciparum reference strains (3D7, 7G8) and chloroquine-resistant clinical isolate (Q206). In a second step we have investigated the antiplasmodial activities of two polysulfonated triarylmethane food dyes. Green S (E142) is weakly active against P. falciparum asexual stage (IC50 ≃ 17 μM) whereas Patent Blue V (E131) is inactive in both antimalarial assays. By applying liquid chromatography techniques for the culture supernatant analysis after cell washings and lysis, we report the detection of Brilliant green in erythrocytes, the selective uptake of Green S (E142) by infected erythrocytes, whereas Patent Blue V (E131) could not be detected within non-infected and 3D7-infected erythrocytes. Overall, our results suggest that two polysulfonated food dyes might display different affinity with transporters or channels on infected RBC membrane. © 2017 The Authors |
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Research Unit of Genetics and Genomics of Insect Vectors Institut Pasteur, Paris, France |
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Export Date: 18 September 2017 |
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EcoFoG @ webmaster @ |
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765 |
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Fayad, I.; Baghdadi, N.; Guitet, S.; Bailly, J.-S.; Herault, B.; Gond, V.; El Hajj, M.; Tong Minh, D.H. |
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Aboveground biomass mapping in French Guiana by combining remote sensing, forest inventories and environmental data |
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Journal Article |
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2016 |
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International Journal of Applied Earth Observation and Geoinformation |
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International Journal of Applied Earth Observation and Geoinformation |
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52 |
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502-514 |
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Aboveground biomass mapping; Forests; French Guiana; ICESat GLAS; LiDAR |
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Mapping forest aboveground biomass (AGB) has become an important task, particularly for the reporting of carbon stocks and changes. AGB can be mapped using synthetic aperture radar data (SAR) or passive optical data. However, these data are insensitive to high AGB levels (>150 Mg/ha, and >300 Mg/ha for P-band), which are commonly found in tropical forests. Studies have mapped the rough variations in AGB by combining optical and environmental data at regional and global scales. Nevertheless, these maps cannot represent local variations in AGB in tropical forests. In this paper, we hypothesize that the problem of misrepresenting local variations in AGB and AGB estimation with good precision occurs because of both methodological limits (signal saturation or dilution bias) and a lack of adequate calibration data in this range of AGB values. We test this hypothesis by developing a calibrated regression model to predict variations in high AGB values (mean >300 Mg/ha) in French Guiana by a methodological approach for spatial extrapolation with data from the optical geoscience laser altimeter system (GLAS), forest inventories, radar, optics, and environmental variables for spatial inter- and extrapolation. Given their higher point count, GLAS data allow a wider coverage of AGB values. We find that the metrics from GLAS footprints are correlated with field AGB estimations (R2 = 0.54, RMSE = 48.3 Mg/ha) with no bias for high values. First, predictive models, including remote-sensing, environmental variables and spatial correlation functions, allow us to obtain “wall-to-wall” AGB maps over French Guiana with an RMSE for the in situ AGB estimates of ∼50 Mg/ha and R2 = 0.66 at a 1-km grid size. We conclude that a calibrated regression model based on GLAS with dependent environmental data can produce good AGB predictions even for high AGB values if the calibration data fit the AGB range. We also demonstrate that small temporal and spatial mismatches between field data and GLAS footprints are not a problem for regional and global calibrated regression models because field data aim to predict large and deep tendencies in AGB variations from environmental gradients and do not aim to represent high but stochastic and temporally limited variations from forest dynamics. Thus, we advocate including a greater variety of data, even if less precise and shifted, to better represent high AGB values in global models and to improve the fitting of these models for high values. © 2016 Elsevier B.V. |
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NOVELTIS, 153 rue du Lac, Labège, France |
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Export Date: 9 December 2016 |
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EcoFoG @ webmaster @ |
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699 |
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Lebrini, M.; Robert, F.; Roos, C. |
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Adsorption properties and inhibition of C38 steel corrosion in hydrochloric solution by some indole derivates: Temperature effect, activation energies, and thermodynamics of adsorption |
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Journal Article |
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Year |
2013 |
Publication |
International Journal of Corrosion |
Abbreviated Journal |
Int. J. Corros. |
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2013 |
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Article ID 139798 |
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13 |
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The corrosion rates in the presence of some indole derivates, namely, 9H-pyrido[3,4-b]indole (norharmane) and 1-methyl-9H-pyrido[3,4-b]indole (harmane), as inhibitors of C38 steel corrosion inhibitor in 1 M HCl solution, were measured by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques, in the range of temperatures from 25 to 55 °C. Results obtained revealed that the organic compounds investigated have inhibiting properties for all temperatures. The inhibition was assumed to occur via adsorption of the indole molecules on the metal surface. Adsorption of indole derivates was found to follow the Langmuir isotherm. The apparent activation energies, enthalpies, and entropies of the dissolution process and the free energies and enthalpies for the adsorption process were determined by potentiodynamic polarization and electrochemical impedance. The fundamental thermodynamic functions were used to collect important information about indole inhibitory behaviour. © 2013 M. Lebrini et al. |
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Laboratoire Matériaux et Molécules en Milieu Amazonien, UAG-UMR ECOFOG, Campus Trou Biran, 97337 Cayenne, French Guiana |
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Export Date: 4 July 2013; Source: Scopus; Art. No.: 139798 |
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EcoFoG @ webmaster @ |
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495 |
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Marcon, E.; Puech, F.; Traissac, S. |
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Characterizing the relative spatial structure of point patterns |
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2012 |
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International Journal of Ecology |
Abbreviated Journal |
Int. J. Ecol. |
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2012 |
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Article ID 619281 |
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11 |
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We generalize Ripley's K function to get a new function, M, to characterize the spatial structure of a point pattern relatively to another one. We show that this new approach is pertinent in ecology when space is not homogenous and the size of objects matters. We present how to use the function and test the data against the null hypothesis of independence between points. In a tropical tree data set we detect intraspecific aggregation and interspecific competition. © 2012 Eric Marcon et al. |
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LET (Université de Lyon, CNRS, ENTPE), Institut des Sciences de l'Homme, 14 avenue Berthelot, 69363 Lyon Cedex 07, France |
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16879708 (Issn) |
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Export Date: 7 November 2012; Source: Scopus; Art. No.: 619281; doi: 10.1155/2012/619281; Language of Original Document: English; Correspondence Address: Marcon, E.; AgroParisTech, UMR EcoFoG, BP 709, 97310 Kourou, French Guiana; email: eric.marcon@ecofog.gf |
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EcoFoG @ webmaster @ |
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446 |
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Wagner, F.; Rossi, V.; Baraloto, C.; Bonal, D.; Stahl, C.; Herault, B. |
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Are commonly measured functional traits involved in tropical tree responses to climate? |
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Journal Article |
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2014 |
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International Journal of Ecology |
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Int. J. Ecol. |
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2014 |
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389409 |
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Climate models predict significant rainfall reduction in Amazonia, reducing water availability for trees. We present how functional traits modulate the tree growth response to climate. We used data from 3 years of bimestrial growth measurements for 204 trees of 53 species in the forest of Paracou, French Guiana. We integrated climate variables from an eddy covariance tower and functional trait values describing life history, leaf, and stem economics. Our results indicated that the measured functional traits are to some extent linked to the response of trees to climate but they are poor predictors of the tree climate-induced growth variation. Tree growth was affected by water availability for most of the species with different species growth strategies in drought conditions. These strategies were linked to some functional traits, especially maximum height and wood density. These results suggest that (i) trees seem adapted to the dry season at Paracou but they show different growth responses to drought, (ii) drought response is linked to growth strategy and is partly explained by functional traits, and (iii) the limited part of the variation of tree growth explained by functional traits may be a strong limiting factor for the prediction of tree growth response to climate. © 2014 Fabien Wagner et al. |
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CIRAD, UMR Systèmes d'Elevage en Milieux Méditerranéens et Tropicaux, 97379 Kourou, France |
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Hindawi Publishing Corporation |
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16879716 (Issn) |
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Export Date: 30 July 2014; Correspondence Address: Wagner, F.; Remote Sensing Division, National Institute for Space Research (INPE), 12227-010 São José dos Campos, SP, Brazil; email: wagner.h.fabien@gmail.com |
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EcoFoG @ webmaster @ |
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556 |
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Lebrini, M.; Robert, F.; Roos, C. |
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Inhibition Effect of Alkaloids Extract from Annona Squamosa Plant on the Corrosion of C38 Steel in Normal Hydrochloric Acid Medium |
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Journal Article |
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2010 |
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International Journal of Electrochemical Science |
Abbreviated Journal |
Int. J. Electrochem. Sci. |
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5 |
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11 |
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1698-1712 |
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Plant extract; corrosion inhibitors; C38 steel; acidic media; adsorption |
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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. |
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[Lebrini, M.] CNRS 8172 UMR ECOFOG, Lab Mat & Mol Milieu Amazonien, Cayenne 97337, French Guiana, Email: florent.robert@guyane.univ-ag.fr |
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ELECTROCHEMICAL SCIENCE GROUP |
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1452-3981 |
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ISI:000283999000015 |
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EcoFoG @ eric.marcon @ |
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20 |
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Lebrini, M.; Robert, F.; Roos, C. |
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Alkaloids Extract from Palicourea guianensis Plant as Corrosion Inhibitor for C38 Steel in 1 M Hydrochloric Acid Medium |
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Journal Article |
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2011 |
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International Journal of Electrochemical Science |
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Int. J. Electrochem. Sci. |
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6 |
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3 |
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847-859 |
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Palicourea guianensis; corrosion inhibitors; C38 steel; acidic media; adsorption |
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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. |
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[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 |
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Electrochemical Science Group |
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1452-3981 |
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ISI:000287820500026 |
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EcoFoG @ webmaster @ |
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298 |
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Lebrini, M.; Robert, F.; Blandinieres, P.A.; Roos, C. |
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Corrosion Inhibition by Isertia coccinea Plant Extract in Hydrochloric Acid Solution |
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Journal Article |
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2011 |
Publication |
International Journal of Electrochemical Science |
Abbreviated Journal |
Int. J. Electrochem. Sci. |
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6 |
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7 |
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2443-2460 |
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Isertia coccinea; corrosion inhibitors; C38 steel; acidic media; adsorption |
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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. |
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[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 |
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Electrochemical Science Group |
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1452-3981 |
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ISI:000292331400014 |
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EcoFoG @ webmaster @ |
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324 |
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Lebrini, M.; Roos, C.; Vezin, H.; Robert, F. |
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Electrochemical and theoretical studies of adsorption of some indole derivates at C38 Steel/Sulfuric acid interface as corrosion inhibitors |
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Journal Article |
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2011 |
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International Journal of Electrochemical Science |
Abbreviated Journal |
Int.J.Electrochem.Sci. |
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6 |
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9 |
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3844-3857 |
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Acidic media; Adsorption; C38 steel; Corrosion inhibitors; Theoretical calculations |
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The inhibitive action of 9H-pyrido[3,4-b]indole (norharmane) and 1-Methyl-9H-pyrido[3,4-b]indole (harmane) on corrosion of C38 steel in 0.5 M H2SO4 solution was investigated through electrochemical techniques. The experimental results obtained revealed that these compounds inhibited the steel corrosion in acid solution for all concentrations studied. Polarization measurements indicate that the examined compounds act as a mixed inhibitor and its inhibition efficiency increases with inhibitor concentration. Data obtained from ac impedance technique show a frequency distribution and therefore a modelling element with frequency dispersion behaviour, a constant phase element (CPE), has been used. The adsorption of used compounds on the steel surface obeys Langmuir's isotherm. The ΔG°ads values were calculated and discussed for both inhibitors. Significant correlations are obtained between inhibition efficiency and quantum chemical parameters using quantitative structure-activity relationship (QSAR) method. © 2011 by ESG. |
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Laboratoire de Chimie Organique et Macromoléculaire, UMR-CNRS 8009, USTL BâtC4, F-59655 Villeneuve d'Ascq Cedex, France |
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14523981 (Issn) |
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Notes |
Export Date: 21 October 2011; Source: Scopus; Language of Original Document: English; Correspondence Address: Robert, F.; Laboratoire Matériaux et Molécules en Milieu Amazonien, UAG-UMR ECOFOG, Campus Trou Biran, Cayenne 97337, French Guiana; email: florent.robert@guyane.univ-ag.fr |
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EcoFoG @ webmaster @ |
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347 |
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