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Author Fu, T.; Touboul, D.; Della-Negra, S.; Houel, E.; Amusant, N.; Duplais, C.; Fisher, G.L.; Brunelle, A.
Title Tandem Mass Spectrometry Imaging and in Situ Characterization of Bioactive Wood Metabolites in Amazonian Tree Species Sextonia rubra Type Journal Article
Year 2018 Publication Analytical Chemistry Abbreviated Journal Anal. Chem.
Volume 90 Issue 12 Pages (down) 7535-7543
Keywords
Abstract Driven by a necessity for confident molecular identification at high spatial resolution, a new time-of-flight secondary ion mass spectrometry (TOF-SIMS) tandem mass spectrometry (tandem MS) imaging instrument has been recently developed. In this paper, the superior MS/MS spectrometry and imaging capability of this new tool is shown for natural product study. For the first time, via in situ analysis of the bioactive metabolites rubrynolide and rubrenolide in Amazonian tree species Sextonia rubra (Lauraceae), we were able both to analyze and to image by tandem MS the molecular products of natural biosynthesis. Despite the low abundance of the metabolites in the wood sample(s), efficient MS/MS analysis of these γ-lactone compounds was achieved, providing high confidence in the identification and localization. In addition, tandem MS imaging minimized the mass interferences and revealed specific localization of these metabolites primarily in the ray parenchyma cells but also in certain oil cells and, further, revealed the presence of previously unidentified γ-lactone, paving the way for future studies in biosynthesis.
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Publisher American Chemical Society Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0003-2700 ISBN Medium
Area Expedition Conference
Notes doi: 10.1021/acs.analchem.8b01157 Approved no
Call Number EcoFoG @ webmaster @ Serial 834
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Author Gonzalez, M.A.; Baraloto, C.; Engel, J.; Mori, S.A.; Petronelli, P.; Riera, B.; Roger, A.; Thebaud, C.; Chave, J.
Title Identification of Amazonian Trees with DNA Barcodes Type Journal Article
Year 2009 Publication PLoS One Abbreviated Journal PLoS One
Volume 4 Issue 10 Pages (down) e7483
Keywords
Abstract Background: Large-scale plant diversity inventories are critical to develop informed conservation strategies. However, the workload required for classic taxonomic surveys remains high and is particularly problematic for megadiverse tropical forests. Methodology/Principal Findings: Based on a comprehensive census of all trees in two hectares of a tropical forest in French Guiana, we examined whether plant DNA barcoding could contribute to increasing the quality and the pace of tropical plant biodiversity surveys. Of the eight plant DNA markers we tested (rbcLa, rpoC1, rpoB, matK, ycf5, trnL, psbA-trnH, ITS), matK and ITS had a low rate of sequencing success. More critically, none of the plastid markers achieved a rate of correct plant identification greater than 70%, either alone or combined. The performance of all barcoding markers was noticeably low in few species-rich clades, such as the Laureae, and the Sapotaceae. A field test of the approach enabled us to detect 130 molecular operational taxonomic units in a sample of 252 juvenile trees. Including molecular markers increased the identification rate of juveniles from 72% (morphology alone) to 96% (morphology and molecular) of the individuals assigned to a known tree taxon. Conclusion/Significance: We conclude that while DNA barcoding is an invaluable tool for detecting errors in identifications and for identifying plants at juvenile stages, its limited ability to identify collections will constrain the practical implementation of DNA-based tropical plant biodiversity programs.
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Publisher PUBLIC LIBRARY SCIENCE Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 1932-6203 ISBN Medium
Area Expedition Conference
Notes ISI:000270880700009 Approved no
Call Number EcoFoG @ eric.marcon @ Serial 189
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Author Ramalho, M.O.; Duplais, C.; Orivel, J.; Dejean, A.; Gibson, J.C.; Suarez, A.V.; Moreau, C.S.
Title Development but not diet alters microbial communities in the Neotropical arboreal trap jaw ant Daceton armigerum: an exploratory study Type Journal Article
Year 2020 Publication Scientific Reports Abbreviated Journal
Volume 10 Issue 1 Pages (down) 7350
Keywords
Abstract To better understand the evolutionary significance of symbiotic interactions in nature, microbiome studies can help to identify the ecological factors that may shape host-associated microbial communities. In this study we explored both 16S and 18S rRNA microbial communities of D. armigerum from both wild caught individuals collected in the Amazon and individuals kept in the laboratory and fed on controlled diets. We also investigated the role of colony, sample type, development and caste on structuring microbial communities. Our bacterial results (16S rRNA) reveal that (1) there are colony level differences between bacterial communities; (2) castes do not structure communities; (3) immature stages (brood) have different bacterial communities than adults; and 4) individuals kept in the laboratory with a restricted diet showed no differences in their bacterial communities from their wild caught nest mates, which could indicate the presence of a stable and persistent resident bacterial community in this host species. The same categories were also tested for microbial eukaryote communities (18S rRNA), and (5) developmental stage has an influence on the diversity recovered; (6) the diversity of taxa recovered has shown this can be an important tool to understand additional aspects of host biology and species interactions.
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Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 2045-2322 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number EcoFoG @ webmaster @ Ramalho2020 Serial 929
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Author Wagner, F.; Rossi, V.; Stahl, C.; Bonal, D.; Herault, B.
Title Asynchronism in leaf and wood production in tropical forests: A study combining satellite and ground-based measurements Type Journal Article
Year 2013 Publication Biogeosciences Abbreviated Journal Biogeosciences
Volume 10 Issue 11 Pages (down) 7307-7321
Keywords
Abstract The fixation of carbon in tropical forests mainly occurs through the production of wood and leaves, both being the principal components of net primary production. Currently field and satellite observations are independently used to describe the forest carbon cycle, but the link between satellite-derived forest phenology and field-derived forest productivity remains opaque. We used a unique combination of a MODIS enhanced vegetation index (EVI) dataset, a wood production model based on climate data and direct litterfall observations at an intra-annual timescale in order to question the synchronism of leaf and wood production in tropical forests. Even though leaf and wood biomass fluxes had the same range (respectively 2.4 ± 1.4 and 2.2 ± 0.4 Mg C ha-1 yr-1), they occurred separately in time. EVI increased with leaf renewal at the beginning of the dry season, when solar irradiance was at its maximum. At this time, wood production stopped. At the onset of the rainy season, when new leaves were fully mature and water available again, wood production quickly increased to reach its maximum in less than a month, reflecting a change in carbon allocation from short-lived pools (leaves) to long-lived pools (wood). The time lag between peaks of EVI and wood production (109 days) revealed a substantial decoupling between the leaf renewal assumed to be driven by irradiance and the water-driven wood production. Our work is a first attempt to link EVI data, wood production and leaf phenology at a seasonal timescale in a tropical evergreen rainforest and pave the way to develop more sophisticated global carbon cycle models in tropical forests. © 2013 Author(s).
Address INRA, UMR EEF 1137, 54280 Champenoux, France
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 17264170 (Issn) ISBN Medium
Area Expedition Conference
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Author Marti, G.; Eparvier, V.; Litaudon, M.; Grellier, P.; Gueritte, F.
Title A New Xanthone from the Bark Extract of Rheedia acuminata and Antiplasmodial Activity of Its Major Compounds Type Journal Article
Year 2010 Publication Molecules Abbreviated Journal Molecules
Volume 15 Issue 10 Pages (down) 7106-7114
Keywords Rheedia acuminata, Clusiaceae; xanthones; antiplasmodial activity; cytotoxicity
Abstract Bioassay-guided fractionation of the ethyl acetate bark extract of Rheedia acuminata led to the isolation of the new compound 1,5,6-trihydroxy-3-methoxy-7-geranyl-xanthone (1), together with four known compounds 2-5. These compounds were tested in vitro for their antiplasmodial activity on a chloroquine-resistant strain of Plasmodium falciparum (FcB1) and for their cytotoxicity against the human diploid embryonic lung cell line MRC-5.
Address [Eparvier, Veronique] CNRS, UPS2561, F-97300 Cayenne, France, Email: guillaume.marti@icsn.cnrs-gif.fr
Corporate Author Thesis
Publisher MDPI AG Place of Publication Editor
Language Summary Language Original Title
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Series Volume Series Issue Edition
ISSN 1420-3049 ISBN Medium
Area Expedition Conference
Notes ISI:000283587400030 Approved no
Call Number EcoFoG @ webmaster @ Serial 282
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Author Gargallo-Garriga, A.; Sardans, J.; Granda, V.; Llusià, J.; Peguero, G.; Asensio, D.; Ogaya, R.; Urbina, I.; Van Langenhove, L.; Verryckt, L.T.; Chave, J.; Courtois, E.A.; Stahl, C.; Grau, O.; Klem, K.; Urban, O.; Janssens, I.A.; Peñuelas, J.
Title Different “metabolomic niches” of the highly diverse tree species of the French Guiana rainforests Type Journal Article
Year 2020 Publication Scientific Reports Abbreviated Journal Sci. Rep.
Volume 10 Issue Pages (down) 6937
Keywords article; ecological niche; French Guiana; metabolome; plant leaf; rainy season; reproduction; stress; tropical rain forest
Abstract Tropical rainforests harbor a particularly high plant diversity. We hypothesize that potential causes underlying this high diversity should be linked to distinct overall functionality (defense and growth allocation, anti-stress mechanisms, reproduction) among the different sympatric taxa. In this study we tested the hypothesis of the existence of a metabolomic niche related to a species-specific differential use and allocation of metabolites. We tested this hypothesis by comparing leaf metabolomic profiles of 54 species in two rainforests of French Guiana. Species identity explained most of the variation in the metabolome, with a species-specific metabolomic profile across dry and wet seasons. In addition to this “homeostatic” species-specific metabolomic profile significantly linked to phylogenetic distances, also part of the variance (flexibility) of the metabolomic profile was explained by season within a single species. Our results support the hypothesis of the high diversity in tropical forest being related to a species-specific metabolomic niche and highlight ecometabolomics as a tool to identify this species functional diversity related and consistent with the ecological niche theory. © 2020, The Author(s).
Address INRA, UMR EcoFoG, CNRS, Cirad, AgroParisTech, Université des Antilles, Université de Guyane, Kourou, 97310, France
Corporate Author Thesis
Publisher Nature Research Place of Publication Editor
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ISSN 20452322 (Issn) ISBN Medium
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Notes Approved no
Call Number EcoFoG @ webmaster @ Serial 930
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Author Réjou-Méchain, M.; Muller-Landau, H.C.; Detto, M.; Thomas, S.C.; Le Toan, T.; Saatchi, S.S.; Barreto-Silva, J.S.; Bourg, N.A.; Bunyavejchewin, S.; Butt, N.; Brockelman, W.Y.; Cao, M.; Cárdenas, D.; Chiang, J.-M.; Chuyong, G.B.; Clay, K.; Condit, R.; Dattaraja, H.S.; Davies, S.J.; Duque, A.; Esufali, S.; Ewango, C.; Fernando, R.H.S.; Fletcher, C.D.; N. Gunatilleke, I.A.U.; Hao, Z.; Harms, K.E.; Hart, T.B.; Herault, B.; Howe, R.W.; Hubbell, S.P.; Johnson, D.J.; Kenfack, D.; Larson, A.J.; Lin, L.; Lin, Y.; Lutz, J.A.; Makana, J.-R.; Malhi, Y.; Marthews, T.R.; Mcewan, R.W.; Mcmahon, S.M.; Mcshea, W.J.; Muscarella, R.; Nathalang, A.; Noor, N.S.M.; Nytch, C.J.; Oliveira, A.A.; Phillips, R.P.; Pongpattananurak, N.; Punchi-Manage, R.; Salim, R.; Schurman, J.; Sukumar, R.; Suresh, H.S.; Suwanvecho, U.; Thomas, D.W.; Thompson, J.; Uríarte, M.; Valencia, R.; Vicentini, A.; Wolf, A.T.; Yap, S.; Yuan, Z.; Zartman, C.E.; Zimmerman, J.K.; Chave, J.
Title Local spatial structure of forest biomass and its consequences for remote sensing of carbon stocks Type Journal Article
Year 2014 Publication Biogeosciences Abbreviated Journal Biogeosciences
Volume 11 Issue 23 Pages (down) 6827-6840
Keywords
Abstract Advances in forest carbon mapping have the potential to greatly reduce uncertainties in the global carbon budget and to facilitate effective emissions mitigation strategies such as REDD+ (Reducing Emissions from Deforestation and Forest Degradation). Though broad-scale mapping is based primarily on remote sensing data, the accuracy of resulting forest carbon stock estimates depends critically on the quality of field measurements and calibration procedures. The mismatch in spatial scales between field inventory plots and larger pixels of current and planned remote sensing products for forest biomass mapping is of particular concern, as it has the potential to introduce errors, especially if forest biomass shows strong local spatial variation. Here, we used 30 large (8-50 ha) globally distributed permanent forest plots to quantify the spatial variability in aboveground biomass density (AGBD in Mg ha-1) at spatial scales ranging from 5 to 250 m (0.025-6.25 ha), and to evaluate the implications of this variability for calibrating remote sensing products using simulated remote sensing footprints. We found that local spatial variability in AGBD is large for standard plot sizes, averaging 46.3% for replicate 0.1 ha subplots within a single large plot, and 16.6% for 1 ha subplots. AGBD showed weak spatial autocorrelation at distances of 20-400 m, with autocorrelation higher in sites with higher topographic variability and statistically significant in half of the sites. We further show that when field calibration plots are smaller than the remote sensing pixels, the high local spatial variability in AGBD leads to a substantial “dilution” bias in calibration parameters, a bias that cannot be removed with standard statistical methods. Our results suggest that topography should be explicitly accounted for in future sampling strategies and that much care must be taken in designing calibration schemes if remote sensing of forest carbon is to achieve its promise.
Address Institute of Biology University of the Philippines DilimanQuezon City, Philippines
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Notes Cited By :1; Export Date: 30 January 2015 Approved no
Call Number EcoFoG @ webmaster @ Serial 582
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Author Bekaert, E.; Robert, F.; Lippens, P.E.; Menetrier, M.
Title Li-7 NMR Knight Shifts in Li-Sn Compounds: MAS NMR Measurements and Correlation with DFT Calculations Type Journal Article
Year 2010 Publication Journal of Physical Chemistry C Abbreviated Journal J. Phys. Chem. C
Volume 114 Issue 14 Pages (down) 6749-6754
Keywords
Abstract Several Li-Sn crystalline phases, LiSn. Li7Sn3, Li5Sn7, Li13Sn5, Li7Sn2, and Li22Sn5. were prepared by ball-milling and studied by Li-7 MAS NMR spectroscopy with silica as a chiming agent to avoid field penetration limitations All phases except for LiSn exhibit exchanged NMR signals at room temperature for the various types of Li present in the unit cells. in the 10 to 100 ppm range. Electronic structure calculations based on first-principles method led to a lather good correlation between the participation of the Li 2s orbital to the density of states (DOS) at the Fermi level and the corresponding NMR Knight shift for the two Li crystallographic types in the case of LiSn, and for the weighted average of the different crystallographic types in the case of the NMR-exchanged signals for the other compounds
Address [Bekaert, Emilie; Menetrier, Michel] Univ Bordeaux, CNRS, ICMCB, F-33608 Pessac, France
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Publisher AMER CHEMICAL SOC Place of Publication Editor
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ISSN 1932-7447 ISBN Medium
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Notes ISI:000276341700075 Approved no
Call Number EcoFoG @ eric.marcon @ Serial 80
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Author Lebrini, M.; Mbomekallé, I.M.; Dolbecq, A.; Marrot, J.; Berthet, P.; Ntienoue, J.; Sécheresse, F.; Vigneron, J.; Etcheberry, A.
Title Manganese(III)-containing wells-dawson sandwich-type polyoxometalates: Comparison with their manganese(II) counterparts Type Journal Article
Year 2011 Publication Inorganic Chemistry Abbreviated Journal Inorg. Chem.
Volume 50 Issue 14 Pages (down) 6437-6448
Keywords
Abstract We present the synthesis and structural characterization, assessed by various techniques (FTIR, TGA, UV-vis, elemental analysis, single-crystal X-ray diffraction for three compounds, magnetic susceptibility, and electrochemistry) of five manganese-containing Wells-Dawson sandwich-type (WDST) complexes. The dimanganese(II)-containing complex, [Na2(H2O) 2MnII2(As2W15O 56)2]18- (1), was obtained by reaction of MnCl2 with 1 equiv of [As2W15O 56]12- in acetate medium (pH 4.7). Oxidation of 1 by Na2S2O8 in aqueous solution led to the dimanganese(III) complex [Na2(H2O)2Mn III2(As2W15O56) 2]16- (2), while its trimanganese(II) homologue, [Na(H2O)2MnII(H2O)Mn II2(As2W15O56) 2]17- (3), was obtained by addition of ca. 1 equiv of MnCl2 to a solution of 1 in 1 M NaCl. The trimanganese(III) and tetramanganese(III) counterparts, [MnIII(H2O)Mn III2(As2W15O56) 2]15- (4) and [MnIII2(H 2O)2MnIII2(As2W 15O56)2]12- (6), are, respectively, obtained by oxidation of aqueous solutions of 3 and [MnII2(H2O)2MnII2(As 2W15O56)2]16- (5) by Na2S2O8. Single-crystal X-ray analyses were carried out on 2, 3, and 4. BVS calculations and XPS confirmed that the oxidation state of Mn centers is +II for complexes 1, 3, and 5 and +III for 2, 4, and 6. A complete comparative electrochemical study was carried out on the six compounds cited above, and it was possible to observe the distinct redox steps MnIV/III and MnIII/II. Magnetization measurements, as a function of temperature, confirm the presence of antiferromagnetic interactions between the Mn ions in these compounds in all cases with the exception of compound 2. © 2011 American Chemical Society.
Address Laboratoire de Physico-Chimie de L'Etat Solide, ICMMO, Université Paris-Sud, Bâtiment 410, 91405 Orsay Cedex, France
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Notes Export Date: 21 October 2011; Source: Scopus; Coden: Inoca; doi: 10.1021/ic102237x; Language of Original Document: English; Correspondence Address: Mbomekallé, I.M.; Institut Lavoisier de Versailles, UMR 8180, CNRS Université de Versailles Saint-Quentin, 45 Avenue des Etats-Unis, 78035 Versailles Cedex, France; email: israel.mbomekalle@chimie.uvsq.fr Approved no
Call Number EcoFoG @ webmaster @ Serial 346
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Author Aubry-Kientz, M.; Rossi, V.; Wagner, F.; Herault, B.
Title Identifying climatic drivers of tropical forest dynamics Type Journal Article
Year 2015 Publication Biogeosciences Abbreviated Journal Biogeosciences
Volume 12 Issue 19 Pages (down) 5583-5596
Keywords
Abstract In the context of climate change, identifying and then predicting the impacts of climatic drivers on tropical forest dynamics is becoming a matter of urgency. To look at these climate impacts, we used a coupled model of tropical tree growth and mortality, calibrated with forest dynamic data from the 20-year study site of Paracou, French Guiana, in order to introduce and test a set of climatic variables. Three major climatic drivers were identified through the variable selection procedure: drought, water saturation and temperature. Drought decreased annual growth and mortality rates, high precipitation increased mortality rates and high temperature decreased growth. Interactions between key functional traits, stature and climatic variables were investigated, showing best resistance to drought for trees with high wood density and for trees with small current diameters. Our results highlighted strong long-term impacts of climate variables on tropical forest dynamics, suggesting potential deep impacts of climate changes during the next century. © Author(s) 2015.
Address Remote Sensing Division, National Institute for Space Research-INPE, São José dos Campos, SP, Brazil
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Notes Export Date: 16 October 2015 Approved no
Call Number EcoFoG @ webmaster @ Serial 631
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