1
|
Ziegler C, Cochard H, Stahl C, Foltzer L, Gérard B, Goret JY, Heuret P, Levionnois S, Maillard P, Bonal D, Coste S. Residual water losses mediate the trade-off between growth and drought-survival across saplings of 12 tropical rainforest tree species with contrasting hydraulic strategies. J Exp Bot 2024:erae159. [PMID: 38613495 DOI: 10.1093/jxb/erae159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Indexed: 04/15/2024]
Abstract
Knowledge of the physiological mechanisms underlying species vulnerability to drought is critical to better understand patterns of tree mortality. Investigating plant adaptive strategies to drought should thus help to fill this knowledge gap, especially in tropical rainforests exhibiting high functional diversity. In a semi-controlled drought experiment on 12 rainforest tree species, we investigated the diversity in hydraulic strategies and whether they determined the ability of saplings to use stored non-structural carbohydrates during an extreme imposed drought. We further explored the importance of water- and carbon-use strategies in relation to drought-survival through a modelling approach. Hydraulic strategies varied considerably across species with a continuum between dehydration- tolerance and -avoidance. During dehydration leading to hydraulic failure and irrespective of hydraulic strategies, species showed strong declines in whole-plant starch concentrations and a maintenance or even an increase in soluble sugar concentrations potentially favouring osmotic adjustments. Residual water losses mediated the trade-off between time to hydraulic failure and growth, suggesting that it is linked to the 'fast-slow' continuum of plant performances and that dehydration avoidance is an effective drought-survival strategy at the sapling stage. Further investigations on residual water losses may be key to understanding the response of tropical rainforest tree communities to climate change.
Collapse
Affiliation(s)
- Camille Ziegler
- UMR EcoFoG, AgroParisTech, CIRAD, CNRS, INRAE, Université des Antilles, Université de Guyane, 97310 Kourou, France
- Université de Lorraine, AgroParisTech, INRAE, UMR SILVA, 54000 Nancy, France
| | - Hervé Cochard
- Université Clermont-Auvergne, INRAE, PIAF, 63000 Clermont-Ferrand, France
| | - Clément Stahl
- UMR EcoFoG, AgroParisTech, CIRAD, CNRS, INRAE, Université des Antilles, Université de Guyane, 97310 Kourou, France
| | - Louis Foltzer
- Université de Lorraine, AgroParisTech, INRAE, UMR SILVA, 54000 Nancy, France
| | - Bastien Gérard
- Université de Lorraine, AgroParisTech, INRAE, UMR SILVA, 54000 Nancy, France
| | - Jean-Yves Goret
- UMR EcoFoG, AgroParisTech, CIRAD, CNRS, INRAE, Université des Antilles, Université de Guyane, 97310 Kourou, France
| | - Patrick Heuret
- UMR EcoFoG, AgroParisTech, CIRAD, CNRS, INRAE, Université des Antilles, Université de Guyane, 97310 Kourou, France
- AMAP, Univ. Montpellier, CIRAD, CNRS, INRAE, IRD, 34000 Montpellier, France
| | - Sébastien Levionnois
- UMR EcoFoG, AgroParisTech, CIRAD, CNRS, INRAE, Université des Antilles, Université de Guyane, 97310 Kourou, France
- AMAP, Univ. Montpellier, CIRAD, CNRS, INRAE, IRD, 34000 Montpellier, France
| | - Pascale Maillard
- Université de Lorraine, AgroParisTech, INRAE, UMR SILVA, 54000 Nancy, France
| | - Damien Bonal
- Université de Lorraine, AgroParisTech, INRAE, UMR SILVA, 54000 Nancy, France
| | - Sabrina Coste
- UMR EcoFoG, AgroParisTech, CIRAD, CNRS, INRAE, Université des Antilles, Université de Guyane, 97310 Kourou, France
| |
Collapse
|
2
|
Hebrard de Veyrinas G, Aigle L, Coste S, Barbier O, Sabaté Ferris A, Loubradou N, Griffier R, Choufani C. Medical management of distal tibiofibular sprains in military medicine: latest data and future treatment perspectives. BMJ Mil Health 2023:e002583. [PMID: 38135457 DOI: 10.1136/military-2023-002583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Accepted: 12/11/2023] [Indexed: 12/24/2023]
Affiliation(s)
| | - L Aigle
- Ecole du Val-de-Grace, Paris, Île-de-France, France
| | - S Coste
- Initial Formation, Military Medical Academy, Paris, France
| | - O Barbier
- Ecole du Val-de-Grace, Paris, Île-de-France, France
- Military Teaching Hospital Sainte Anne, Toulon, France
| | - A Sabaté Ferris
- Percy Military Training Hospital, Clamart, Île-de-France, France
| | - N Loubradou
- Ecole du Val-de-Grace, Paris, Île-de-France, France
| | - R Griffier
- Department of Public Health, University of Bordeaux, Talence, France
| | - C Choufani
- Military Teaching Hospital Sainte Anne, Toulon, France
| |
Collapse
|
3
|
Fortunel C, Stahl C, Coste S, Ziegler C, Derroire G, Levionnois S, Maréchaux I, Bonal D, Hérault B, Wagner FH, Sack L, Chave J, Heuret P, Jansen S, John G, Scoffoni C, Trueba S, Bartlett MK. Thresholds for persistent leaf photochemical damage predict plant drought resilience in a tropical rainforest. New Phytol 2023. [PMID: 37222272 DOI: 10.1111/nph.18973] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Subscribe] [Scholar Register] [Received: 01/13/2023] [Accepted: 04/12/2023] [Indexed: 05/25/2023]
Abstract
Water stress can cause declines in plant function that persist after rehydration. Recent work has defined 'resilience' traits characterizing leaf resistance to persistent damage from drought, but whether these traits predict resilience in whole-plant function is unknown. It is also unknown whether the coordination between resilience and 'resistance' - the ability to maintain function during drought - observed globally occurs within ecosystems. For eight rainforest species, we dehydrated and subsequently rehydrated leaves, and measured water stress thresholds for declines in rehydration capacity and maximum quantum yield of photosystem II (Fv /Fm ). We tested correlations with embolism resistance and dry season water potentials (ΨMD ), and calculated safety margins for damage (ΨMD - thresholds) and tested correlations with drought resilience in sap flow and growth. Ψ thresholds for persistent declines in Fv /Fm , indicating resilience, were positively correlated with ΨMD and thresholds for leaf vein embolism. Safety margins for persistent declines in Fv /Fm , but not rehydration capacity, were positively correlated with drought resilience in sap flow. Correlations between resistance and resilience suggest that species' differences in performance during drought are perpetuated after drought, potentially accelerating shifts in forest composition. Resilience to photochemical damage emerged as a promising functional trait to characterize whole-plant drought resilience.
Collapse
Affiliation(s)
- Claire Fortunel
- AMAP (Botanique et Modélisation de l'Architecture des Plantes et des Végétations), Université de Montpellier, CIRAD, CNRS, INRAE, IRD, 34000, Montpellier, France
| | - Clément Stahl
- INRAE, UMR EcoFoG, CNRS, CIRAD, AgroParisTech, Université des Antilles, Université de Guyane, 97310, Kourou, France
| | - Sabrina Coste
- INRAE, UMR EcoFoG, CNRS, CIRAD, AgroParisTech, Université des Antilles, Université de Guyane, 97310, Kourou, France
| | - Camille Ziegler
- INRAE, UMR EcoFoG, CNRS, CIRAD, AgroParisTech, Université des Antilles, Université de Guyane, 97310, Kourou, France
- Université de Lorraine, AgroParisTech, INRAE, UMR Silva, 54000, Nancy, France
| | - Géraldine Derroire
- CIRAD, UMR EcoFoG (AgroParistech, CNRS, INRAE, Université des Antilles, Université de la Guyane), Campus Agronomique, 97310, Kourou, French Guiana
| | - Sébastien Levionnois
- AMAP (Botanique et Modélisation de l'Architecture des Plantes et des Végétations), Université de Montpellier, CIRAD, CNRS, INRAE, IRD, 34000, Montpellier, France
- INRAE, UMR EcoFoG, CNRS, CIRAD, AgroParisTech, Université des Antilles, Université de Guyane, 97310, Kourou, France
| | - Isabelle Maréchaux
- AMAP (Botanique et Modélisation de l'Architecture des Plantes et des Végétations), Université de Montpellier, CIRAD, CNRS, INRAE, IRD, 34000, Montpellier, France
| | - Damien Bonal
- Université de Lorraine, AgroParisTech, INRAE, UMR Silva, 54000, Nancy, France
| | - Bruno Hérault
- CIRAD, UPR Forêts et Sociétés, Yamoussoukro, Côte d'Ivoire
- Forêts et Sociétés, Univ Montpellier, CIRAD, 34000, Montpellier, France
- Institut National Polytechnique Félix Houphouët-Boigny, INP-HB, Yamoussoukro, Côte d'Ivoire
| | - Fabien H Wagner
- Institute of Environment and Sustainability, University of California, Los Angeles, CA, 90095, USA
- Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove, Pasadena, CA, 91109, USA
| | - Lawren Sack
- Department of Ecology and Evolutionary Biology, University of California, Los Angeles, CA, 90095, USA
| | - Jérôme Chave
- CNRS, Université Toulouse 3 Paul Sabatier, IRD, UMR 5174 Evolution et Diversité Biologique (EDB), 31062, Toulouse, France
| | - Patrick Heuret
- AMAP (Botanique et Modélisation de l'Architecture des Plantes et des Végétations), Université de Montpellier, CIRAD, CNRS, INRAE, IRD, 34000, Montpellier, France
| | - Steven Jansen
- Institute of Botany, Ulm University, Albert-Einstein-Allee 11, 89081, Ulm, Germany
| | - Grace John
- Department of Biology, University of Florida, Gainesville, FL, 32611, USA
| | - Christine Scoffoni
- Department of Biological Sciences, California State University, Los Angeles, CA, 90032, USA
| | - Santiago Trueba
- Université de Bordeaux, INRAE, UMR BIOGECO, Pessac, 33615, France
| | - Megan K Bartlett
- Department of Viticulture and Enology, University of California, Davis, CA, 95616, USA
| |
Collapse
|
4
|
Pautonnier A, Coste S, Barré M, Lacorre P. Higher Lanthanum Molybdates: Structures, Crystal Chemistry and Properties. PROG SOLID STATE CH 2022. [DOI: 10.1016/j.progsolidstchem.2022.100382] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
5
|
Levionnois S, Kaack L, Heuret P, Abel N, Ziegler C, Coste S, Stahl C, Jansen S. Pit characters determine drought-induced embolism resistance of leaf xylem across 18 Neotropical tree species. Plant Physiol 2022; 190:371-386. [PMID: 35567500 PMCID: PMC9434246 DOI: 10.1093/plphys/kiac223] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Accepted: 04/19/2022] [Indexed: 05/16/2023]
Abstract
Embolism spreading in xylem is an important component of plant drought resistance. Since embolism resistance has been shown to be mechanistically linked to pit membrane characters in stem xylem, we speculate that similar mechanisms account for leaf xylem. We conducted transmission electron microscopy to investigate pit membrane characters in leaf xylem across 18 Neotropical tree species. We also conducted gold perfusion and polar lipid detection experiments on three species covering the full range of leaf embolism resistance. We then related these observations to previously published data on embolism resistance of leaf xylem. We also incorporated previously published data on stem embolism resistance and stem xylem pit membranes to investigate the link between vulnerability segmentation (i.e. difference in embolism resistance) and leaf-stem anatomical variation. Maximum pit membrane thickness (Tpm,max) and the pit membrane thickness-to-diameter ratio (Tpm,max/Dpm) were predictive of leaf embolism resistance, especially when vestured pits were taken into account. Variation in Tpm,max/Dpm was the only trait predictive of vulnerability segmentation between leaves and stems. Gold particles of 5- and 10-nm infiltrated pit membranes in three species, while the entry of 50-nm particles was blocked. Moreover, polar lipids were associated with inner conduit walls and pits. Our results suggest that mechanisms related to embolism spreading are determined by Tpm, pore constrictions (i.e. the narrowest bottlenecks along pore pathways), and lipid surfactants, which are largely similar between leaf and stem xylem and between temperate and tropical trees. However, our mechanistic understanding of embolism propagation and the functional relevance of Tpm,max/Dpm remains elusive.
Collapse
Affiliation(s)
| | - Lucian Kaack
- Institute of Systematic Botany and Ecology, Ulm University, Ulm D-89081, Germany
| | | | - Nina Abel
- Institute of Systematic Botany and Ecology, Ulm University, Ulm D-89081, Germany
| | - Camille Ziegler
- UMR EcoFoG, AgroParisTech, CIRAD, CNRS, INRAE, Université des Antilles, Université de Guyane, Kourou 97310, France
- Université de Lorraine, AgroParisTech, INRAE, UMR SILVA, Nancy 54000, France
| | - Sabrina Coste
- UMR EcoFoG, AgroParisTech, CIRAD, CNRS, INRAE, Université des Antilles, Université de Guyane, Kourou 97310, France
| | - Clément Stahl
- UMR EcoFoG, AgroParisTech, CIRAD, CNRS, INRAE, Université des Antilles, Université de Guyane, Kourou 97310, France
| | | |
Collapse
|
6
|
Schmitt S, Trueba S, Coste S, Ducouret É, Tysklind N, Heuertz M, Bonal D, Burban B, Hérault B, Derroire G. Seasonal variation of leaf thickness: An overlooked component of functional trait variability. Plant Biol (Stuttg) 2022; 24:458-463. [PMID: 35120262 DOI: 10.1111/plb.13395] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2021] [Accepted: 01/07/2022] [Indexed: 06/14/2023]
Abstract
The dry and wet seasons in the Neotropics have strong effects on soil water and nutrient availability, as well as on forest dynamics. Despite these major effects on forest ecology, little is known on how leaf traits vary throughout the seasons in tropical rainforest trees. Here, we investigated the influence of seasonal variations in climate and soil characteristics on leaf trait variation in two tropical tree species. We measured two leaf traits, thickness and water mass per area, in 401 individuals of two species of Symphonia (Clusiaceae) in the Paracou research station in French Guiana tropical lowland rainforest. We found a significant effect of seasonal variation on these two leaf traits. Soil relative extractable water was a strong environmental predictor of leaf trait variation in response to seasonal variation. Reduced soil water availability during the dry season was associated with increased leaf thickness and water mass per area, possibly as a result of stomatal closure. Our findings advocate the need to account for environmental seasonality when studying leaf traits in seasonal ecosystems such as tropical forests.
Collapse
Affiliation(s)
- S Schmitt
- CNRS, UMR EcoFoG (Agroparistech, Cirad, INRAE, Université des Antilles, Université de la Guyane), Campus Agronomique, Kourou, French Guiana
- Université de Bordeaux, INRAE, BIOGECO, Pessac, France
| | - S Trueba
- Université de Bordeaux, INRAE, BIOGECO, Allée Geoffroy St-Hilaire, Pessac, France
| | - S Coste
- Université de la Guyane, UMR EcoFoG (Agroparistech, Cirad, CNRS, INRAE, Université des Antilles), Campus Agronomique, Kourou, French Guiana
| | - É Ducouret
- Université de la Guyane, UMR EcoFoG (Agroparistech, Cirad, CNRS, INRAE, Université des Antilles), Campus Agronomique, Kourou, French Guiana
| | - N Tysklind
- INRAE, UMR EcoFoG (Agroparistech, CNRS, Cirad, Université des Antilles, Université de la Guyane), Campus Agronomique, Kourou, French Guiana
| | - M Heuertz
- Université de Bordeaux, INRAE, BIOGECO, Pessac, France
| | - D Bonal
- Université de Lorraine, AgroParisTech, INRAE, UMR Silva, Nancy, France
| | - B Burban
- INRAE, UMR EcoFoG (Agroparistech, CNRS, Cirad, Université des Antilles, Université de la Guyane), Campus Agronomique, Kourou, French Guiana
| | - B Hérault
- Forêts et Sociétés, Université de Montpellier, CIRAD, Montpellier, France
- Institut National Polytechnique Félix Houphouët-Boigny, INP-HB, Yamoussoukro, Côte d'Ivoire
| | - G Derroire
- Cirad, UMR EcoFoG (Agroparistech, CNRS, INRAE, Université des Antilles, Université de la Guyane), Campus Agronomique, Kourou, French Guiana
| |
Collapse
|
7
|
Manzi OJL, Bellifa M, Ziegler C, Mihle L, Levionnois S, Burban B, Leroy C, Coste S, Stahl C. Drought stress recovery of hydraulic and photochemical processes in Neotropical tree saplings. Tree Physiol 2022; 42:114-129. [PMID: 34302178 DOI: 10.1093/treephys/tpab092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Accepted: 07/16/2021] [Indexed: 06/13/2023]
Abstract
Climate models predict an increase in the severity and the frequency of droughts. Tropical forests are among the ecosystems that could be highly impacted by these droughts. Here, we explore how hydraulic and photochemical processes respond to drought stress and re-watering. We conducted a pot experiment on saplings of five tree species. Before the onset of drought, we measured a set of hydraulic traits, including minimum leaf conductance, leaf embolism resistance and turgor loss point. During drought stress, we monitored traits linked to leaf hydraulic functioning (leaf water potential (ψmd) and stomatal conductance (gs)) and traits linked to leaf photochemical functioning (maximum quantum yield of photosystem II (Fv/Fm) and maximum electron transport rate (ETRmax)) at different wilting stages. After re-watering, the same traits were measured after 3, 7 and 14 days. Hydraulic trait values decreased faster than photochemical trait values. After re-watering, the values of the four traits recovered at different rates. Fv/Fm recovered very fast close to their initial values only 3 days after re-watering. This was followed by ETRmax, Ψmd and gs. Finally, we show that species with large stomatal and leaf safety margin and low πtlp are not strongly impacted by drought, whereas they have a low recovery on photochemical efficiency. These results demonstrate that πtlp, stomatal and leaf safety margin are a good indicators of plant responses to drought stress and also to recovery for photochemical efficiency.
Collapse
Affiliation(s)
- Olivier Jean Leonce Manzi
- UMR EcoFoG, CNRS, CIRAD, INRAE, AgroParisTech, Université des Antilles, Université de Guyane, 97310 Kourou, France
- Integrated Polytechnic Regional College-Kitabi, Rwanda Polytechnic, PO Box 330, Huye, Rwanda
- Department of Biological and Environmental Sciences, University of Gothenburg, PO Box 461, SE-40530 Gothenburg, Sweden
| | - Maxime Bellifa
- UMR EcoFoG, CNRS, CIRAD, INRAE, AgroParisTech, Université des Antilles, Université de Guyane, 97310 Kourou, France
| | - Camille Ziegler
- UMR EcoFoG, CNRS, CIRAD, INRAE, AgroParisTech, Université des Antilles, Université de Guyane, 97310 Kourou, France
- Université de Lorraine, AgroParisTech, INRAE, UMR Silva, 54000 Nancy, France
| | - Louis Mihle
- UMR EcoFoG, CNRS, CIRAD, INRAE, AgroParisTech, Université des Antilles, Université de Guyane, 97310 Kourou, France
| | - Sébastien Levionnois
- UMR EcoFoG, CNRS, CIRAD, INRAE, AgroParisTech, Université des Antilles, Université de Guyane, 97310 Kourou, France
- AMAP, Univ Montpellier, CIRAD, CNRS, INRAE, IRD, 34000 Montpellier, France
| | - Benoit Burban
- UMR EcoFoG, CNRS, CIRAD, INRAE, AgroParisTech, Université des Antilles, Université de Guyane, 97310 Kourou, France
| | - Céline Leroy
- UMR EcoFoG, CNRS, CIRAD, INRAE, AgroParisTech, Université des Antilles, Université de Guyane, 97310 Kourou, France
- AMAP, Univ Montpellier, CIRAD, CNRS, INRAE, IRD, 34000 Montpellier, France
| | - Sabrina Coste
- UMR EcoFoG, CNRS, CIRAD, INRAE, AgroParisTech, Université des Antilles, Université de Guyane, 97310 Kourou, France
| | - Clément Stahl
- UMR EcoFoG, CNRS, CIRAD, INRAE, AgroParisTech, Université des Antilles, Université de Guyane, 97310 Kourou, France
| |
Collapse
|
8
|
Levionnois S, Salmon C, Alméras T, Clair B, Ziegler C, Coste S, Stahl C, González-Melo A, Heinz C, Heuret P. Anatomies, vascular architectures, and mechanics underlying the leaf size-stem size spectrum in 42 Neotropical tree species. J Exp Bot 2021; 72:7957-7969. [PMID: 34390333 DOI: 10.1093/jxb/erab379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Accepted: 08/13/2021] [Indexed: 06/13/2023]
Abstract
The leaf size-stem size spectrum is one of the main dimensions of plant ecological strategies. Yet the anatomical, mechanical, and hydraulic implications of small versus large shoots are still poorly understood. We investigated 42 tropical rainforest tree species in French Guiana, with a wide range of leaf areas at the shoot level. We quantified the scaling of hydraulic and mechanical constraints with shoot size, estimated as the water potential difference (ΔΨ) and the bending angle (ΔΦ), respectively. We investigated how anatomical tissue area, flexural stiffness and xylem vascular architecture affect such scaling by deviating (or not) from theoretical isometry with shoot size variation. Vessel diameter and conductive path length were found to be allometrically related to shoot size, thereby explaining the independence between ΔΨ and shoot size. Leaf mass per area, stem length, and the modulus of elasticity were allometrically related to shoot size, explaining the independence between ΔΦ and shoot size. Our study also shows that the maintenance of both water supply and mechanical stability across the shoot size range are not in conflict.
Collapse
Affiliation(s)
- Sébastien Levionnois
- UMR EcoFoG, AgroParisTech, CIRAD, CNRS, INRAE, Université des Antilles, Université de Guyane, 97310 Kourou, France
- UMR AMAP, Université de Montpellier, CIRAD, CNRS, INRAE, IRD, Université de Montpellier, 34000 Montpellier, France
| | - Camille Salmon
- UMR AMAP, Université de Montpellier, CIRAD, CNRS, INRAE, IRD, Université de Montpellier, 34000 Montpellier, France
| | - Tancrède Alméras
- LMGC, CNRS, Université de Montpellier, 34090 Montpellier, France
| | - Bruno Clair
- LMGC, CNRS, Université de Montpellier, 34090 Montpellier, France
| | - Camille Ziegler
- UMR EcoFoG, AgroParisTech, CIRAD, CNRS, INRAE, Université des Antilles, Université de Guyane, 97310 Kourou, France
- UMR SILVA, INRAE, Université de Lorraine, 54000 Nancy, France
| | - Sabrina Coste
- UMR EcoFoG, AgroParisTech, CIRAD, CNRS, INRAE, Université des Antilles, Université de Guyane, 97310 Kourou, France
| | - Clément Stahl
- UMR EcoFoG, AgroParisTech, CIRAD, CNRS, INRAE, Université des Antilles, Université de Guyane, 97310 Kourou, France
| | | | - Christine Heinz
- UMR AMAP, Université de Montpellier, CIRAD, CNRS, INRAE, IRD, Université de Montpellier, 34000 Montpellier, France
| | - Patrick Heuret
- UMR AMAP, Université de Montpellier, CIRAD, CNRS, INRAE, IRD, Université de Montpellier, 34000 Montpellier, France
| |
Collapse
|
9
|
Allonneau A, Villeneuve JP, Sempere H, Couderc A, Nicaise A, Soula M, Kerrien C, Minaberry S, Bertrand M, Mourougou M, Coste S. [The contribution of teleconsultation and isolation of symptomatic cases in control of the COVID-19 outbreak a military base]. Rev Epidemiol Sante Publique 2021; 69:167-171. [PMID: 34119362 PMCID: PMC8162725 DOI: 10.1016/j.respe.2021.05.048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2020] [Revised: 04/25/2021] [Accepted: 05/12/2021] [Indexed: 12/01/2022] Open
Abstract
Position du problème La première vague de la COVID-19 a déferlé sur la France au cours du premier trimestre 2020 entraînant une saturation du réseau de soins. Nous avons voulu étudier, au sein d’une antenne médicale militaire française soutenant un des plus grands effectifs des armées, l’impact de la téléconsultation ainsi que de l’isolement systématique de tous les cas possibles, probables et confirmés de COVID-19. Méthodes Il s’agit d’une étude rétrospective réalisée du 9 mars au 31 mai 2020 à partir de notre registre d’activité. Les variables recueillies étaient notamment le type d’épisode, le statut professionnel, la classification du cas et la date de début des symptômes. Nous avons mis en parallèle notre activité à celle de SOS Médecins et des services d’urgence d’Île-de-France. Résultats et discussion Au cours de cette période, 1719 épisodes de soins (téléconsultations ou consultations physiques) ont été enregistrés dont 91 % (n = 1561) en lien avec la COVID-19. Nous avons identifié 598 cas “suspects” (possibles et probables) et confirmés. Les téléconsultations “isolées” (non suivies d’une consultation médicale en présentiel, d’un prélèvement ou ayant nécessité l’envoi de prompt-secours) ont représenté 86 % des épisodes de soins (n = 1482). La comparaison de notre activité et du nombre de nouveaux cas aux bases de données de SOS Médecins et des services d’urgences d’Île-de-France laisse supposer que notre stratégie d’isolement a été rapidement efficace. Conclusion L’apport de la téléconsultation a été majeur et sécurisant. La téléconsultation permet d’absorber un volume de patients important, est facile à mettre en œuvre et se caractérise par l’absence de risque nosocomial. L’isolement des patients contaminés doit constituer une priorité en période épidémique. Cette attitude doit s’étendre, lorsque l’on veut maitriser rapidement une épidémie, à l’ensemble des patients symptomatiques.
Collapse
Affiliation(s)
| | | | - H Sempere
- Centre médical des armées de Paris, France
| | - A Couderc
- Centre médical des armées de Paris, France
| | - A Nicaise
- Centre médical des armées de Paris, France
| | - M Soula
- Centre médical des armées de Paris, France
| | - C Kerrien
- Centre médical des armées de Paris, France
| | | | - M Bertrand
- Centre médical des armées de Paris, France
| | | | - S Coste
- Centre médical des armées de Paris, France
| |
Collapse
|
10
|
Levionnois S, Jansen S, Wandji RT, Beauchêne J, Ziegler C, Coste S, Stahl C, Delzon S, Authier L, Heuret P. Linking drought-induced xylem embolism resistance to wood anatomical traits in Neotropical trees. New Phytol 2021; 229:1453-1466. [PMID: 32964439 DOI: 10.1111/nph.16942] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Accepted: 09/04/2020] [Indexed: 05/27/2023]
Abstract
Drought-induced xylem embolism is considered to be one of the main factors driving mortality in woody plants worldwide. Although several structure-functional mechanisms have been tested to understand the anatomical determinants of embolism resistance, there is a need to study this topic by integrating anatomical data for many species. We combined optical, laser, and transmission electron microscopy to investigate vessel diameter, vessel grouping, and pit membrane ultrastructure for 26 tropical rainforest tree species across three major clades (magnoliids, rosiids, and asteriids). We then related these anatomical observations to previously published data on drought-induced embolism resistance, with phylogenetic analyses. Vessel diameter, vessel grouping, and pit membrane ultrastructure were all predictive of xylem embolism resistance, but with weak predictive power. While pit membrane thickness was a predictive trait when vestured pits were taken into account, the pit membrane diameter-to-thickness ratio suggests a strong importance of the deflection resistance of the pit membrane. However, phylogenetic analyses weakly support adaptive coevolution. Our results emphasize the functional significance of pit membranes for air-seeding in tropical rainforest trees, highlighting also the need to study their mechanical properties due to the link between embolism resistance and pit membrane diameter-to-thickness ratio. Finding support for adaptive coevolution also remains challenging.
Collapse
Affiliation(s)
- Sébastien Levionnois
- UMR EcoFoG, AgroParisTech, CIRAD, CNRS, INRAE, Université des Antilles, Université de Guyane, Kourou, 97310, France
- UMR AMAP, Université de Montpellier, CIRAD, CNRS, INRAE, IRD, Montpellier, 34000, France
| | - Steven Jansen
- Institute of Systematic Botany and Ecology, Ulm University, Ulm, D-89081, Germany
| | - Ruth Tchana Wandji
- UMR EcoFoG, AgroParisTech, CIRAD, CNRS, INRAE, Université des Antilles, Université de Guyane, Kourou, 97310, France
| | - Jacques Beauchêne
- UMR EcoFoG, AgroParisTech, CIRAD, CNRS, INRAE, Université des Antilles, Université de Guyane, Kourou, 97310, France
| | - Camille Ziegler
- UMR EcoFoG, AgroParisTech, CIRAD, CNRS, INRAE, Université des Antilles, Université de Guyane, Kourou, 97310, France
- AgroParisTech, UMR Silva, INRAE, Université de Lorraine, Nancy, F-54000, France
| | - Sabrina Coste
- UMR EcoFoG, AgroParisTech, CIRAD, CNRS, INRAE, Université des Antilles, Université de Guyane, Kourou, 97310, France
| | - Clément Stahl
- UMR EcoFoG, AgroParisTech, CIRAD, CNRS, INRAE, Université des Antilles, Université de Guyane, Kourou, 97310, France
| | - Sylvain Delzon
- UMR BIOGECO, INRAE, Université de Bordeaux, Pessac, 33615, France
| | - Louise Authier
- UMR EcoFoG, AgroParisTech, CIRAD, CNRS, INRAE, Université des Antilles, Université de Guyane, Kourou, 97310, France
| | - Patrick Heuret
- UMR EcoFoG, AgroParisTech, CIRAD, CNRS, INRAE, Université des Antilles, Université de Guyane, Kourou, 97310, France
| |
Collapse
|
11
|
Svensk M, Coste S, Gérard B, Gril E, Julien F, Maillard P, Stahl C, Leroy C. Drought effects on resource partition and conservation among leaf ontogenetic stages in epiphytic tank bromeliads. Physiol Plant 2020; 170:488-507. [PMID: 32623731 DOI: 10.1111/ppl.13161] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2020] [Revised: 06/22/2020] [Accepted: 07/01/2020] [Indexed: 06/11/2023]
Abstract
Studying the response to drought stress of keystone epiphytes such as tank bromeliads is essential to better understand their resistance capacity to future climate change. The objective was to test whether there is any variation in the carbon, water and nutrient status among different leaf ontogenetic stages in a bromeliad rosette subjected to a gradient of drought stress. We used a semi-controlled experiment consisting in a gradient of water shortage in Aechmea aquilega and Lutheria splendens. For each bromeliad and drought treatment, three leaves were collected based on their position in the rosette and several functional traits related to water and nutrient status, and carbon metabolism were measured. We found that water status traits (relative water content, leaf succulence, osmotic and midday water potentials) and carbon metabolism traits (carbon assimilation, maximum quantum yield of photosystem II, chlorophyll and starch contents) decreased with increasing drought stress, while leaf soluble sugars and carbon, nitrogen and phosphorus contents remained unchanged. The different leaf ontogenetic stages showed only marginal variations when subjected to a gradient of drought. Resources were not reallocated between different leaf ontogenetic stages but we found a reallocation of soluble sugars from leaf starch reserves to the root system. Both species were capable of metabolic and physiological adjustments in response to drought. Overall, this study advances our understanding of the resistance of bromeliads faced with increasing drought stress and paves the way for in-depth reflection on their strategies to cope with water shortage.
Collapse
Affiliation(s)
- Mia Svensk
- AMAP, Univ Montpellier, CIRAD, CNRS, INRAE, IRD, Montpellier, France
- UMR EcoFoG, CNRS, CIRAD, INRAE, AgroParisTech, Université des Antilles, Université de Guyane, Kourou, 97310, France
- Grazing Systems, Agroscope, Route de Duillier 50, Nyon, 1260, Suisse
| | - Sabrina Coste
- UMR EcoFoG, CNRS, CIRAD, INRAE, AgroParisTech, Université des Antilles, Université de Guyane, Kourou, 97310, France
| | - Bastien Gérard
- INRAE, UMR Silva, AgroParisTech, Université de Lorraine, Nancy, F-54000, France
| | - Eva Gril
- AMAP, Univ Montpellier, CIRAD, CNRS, INRAE, IRD, Montpellier, France
- UMR EcoFoG, CNRS, CIRAD, INRAE, AgroParisTech, Université des Antilles, Université de Guyane, Kourou, 97310, France
- UMR 'Ecologie et Dynamique des Systèmes Anthropisées' (EDYSAN, UMR 7058 CNRS-UPJV), Univ. de Picardie Jules Verne, Amiens, France
| | - Frédéric Julien
- Laboratoire Ecologie Fonctionnelle et Environnement, Université de Toulouse, CNRS, Toulouse, 31062, France
| | - Pascale Maillard
- INRAE, UMR Silva, AgroParisTech, Université de Lorraine, Nancy, F-54000, France
| | - Clément Stahl
- UMR EcoFoG, CNRS, CIRAD, INRAE, AgroParisTech, Université des Antilles, Université de Guyane, Kourou, 97310, France
| | - Céline Leroy
- AMAP, Univ Montpellier, CIRAD, CNRS, INRAE, IRD, Montpellier, France
- UMR EcoFoG, CNRS, CIRAD, INRAE, AgroParisTech, Université des Antilles, Université de Guyane, Kourou, 97310, France
| |
Collapse
|
12
|
Dargaud M, Malgoyre A, Facione J, Michel R, Koulmann N, Coste S. État des lieux de l’accompagnement à la reprise du sport après arrêt de l’entraînement dans l’armée française. Sci Sports 2020. [DOI: 10.1016/j.scispo.2020.03.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
13
|
Levionnois S, Ziegler C, Jansen S, Calvet E, Coste S, Stahl C, Salmon C, Delzon S, Guichard C, Heuret P. Vulnerability and hydraulic segmentations at the stem-leaf transition: coordination across Neotropical trees. New Phytol 2020; 228:512-524. [PMID: 32496575 DOI: 10.1111/nph.16723] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Accepted: 05/18/2020] [Indexed: 05/23/2023]
Abstract
Hydraulic segmentation at the stem-leaf transition predicts higher hydraulic resistance in leaves than in stems. Vulnerability segmentation, however, predicts lower embolism resistance in leaves. Both mechanisms should theoretically favour runaway embolism in leaves to preserve expensive organs such as stems, and should be tested for any potential coordination. We investigated the theoretical leaf-specific conductivity based on an anatomical approach to quantify the degree of hydraulic segmentation across 21 tropical rainforest tree species. Xylem resistance to embolism in stems (flow-centrifugation technique) and leaves (optical visualization method) was quantified to assess vulnerability segmentation. We found a pervasive hydraulic segmentation across species, but with a strong variability in the degree of segmentation. Despite a clear continuum in the degree of vulnerability segmentation, eight species showed a positive vulnerability segmentation (leaves less resistant to embolism than stems), whereas the remaining species studied exhibited a negative or no vulnerability segmentation. The degree of vulnerability segmentation was positively related to the degree of hydraulic segmentation, such that segmented species promote both mechanisms to hydraulically decouple leaf xylem from stem xylem. To what extent hydraulic and vulnerability segmentation determine drought resistance requires further integration of the leaf-stem transition at the whole-plant level, including both xylem and outer xylem tissue.
Collapse
Affiliation(s)
- Sébastien Levionnois
- UMR EcoFoG, AgroParisTech, CIRAD, CNRS, INRAE, Université des Antilles, Université de Guyane, Kourou, 97310, France
- AMAP , Univ Montpellier , CIRAD, CNRS, INRAE, IRD, Montpellier, 34000, France
| | - Camille Ziegler
- UMR EcoFoG, AgroParisTech, CIRAD, CNRS, INRAE, Université des Antilles, Université de Guyane, Kourou, 97310, France
- UMR SILVA, INRAE , Université de Lorraine, Nancy, 54000, France
| | - Steven Jansen
- Institute of Systematic Botany and Ecology, Ulm University, Ulm, D-89081, Germany
| | - Emma Calvet
- UMR EcoFoG, AgroParisTech, CIRAD, CNRS, INRAE, Université des Antilles, Université de Guyane, Kourou, 97310, France
| | - Sabrina Coste
- UMR EcoFoG, AgroParisTech, CIRAD, CNRS, INRAE, Université des Antilles, Université de Guyane, Kourou, 97310, France
| | - Clément Stahl
- UMR EcoFoG, AgroParisTech, CIRAD, CNRS, INRAE, Université des Antilles, Université de Guyane, Kourou, 97310, France
| | - Camille Salmon
- AMAP , Univ Montpellier , CIRAD, CNRS, INRAE, IRD, Montpellier, 34000, France
| | - Sylvain Delzon
- Univ. Bordeaux , INRAE, BIOGECO, Pessac, F-33615, France
| | - Charlotte Guichard
- UMR EcoFoG, AgroParisTech, CIRAD, CNRS, INRAE, Université des Antilles, Université de Guyane, Kourou, 97310, France
| | - Patrick Heuret
- UMR EcoFoG, AgroParisTech, CIRAD, CNRS, INRAE, Université des Antilles, Université de Guyane, Kourou, 97310, France
- AMAP , Univ Montpellier , CIRAD, CNRS, INRAE, IRD, Montpellier, 34000, France
| |
Collapse
|
14
|
Verryckt LT, Ellsworth DS, Vicca S, Van Langenhove L, Peñuelas J, Ciais P, Posada JM, Stahl C, Coste S, Courtois EA, Obersteiner M, Chave J, Janssens IA. Can light‐saturated photosynthesis in lowland tropical forests be estimated by one light level? Biotropica 2020. [DOI: 10.1111/btp.12817] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - David S. Ellsworth
- Hawkesbury Institute for the Environment Western Sydney University Penrith NSW Australia
| | - Sara Vicca
- Department of Biology University of Antwerp Wilrijk Belgium
| | | | - Josep Peñuelas
- CREAF Barcelona Spain
- CSIC Global Ecology CREAF‐CSIC‐UAB Barcelona Spain
| | - Philippe Ciais
- Laboratoire des Sciences du Climat et de l’Environnement CEA‐CNRS‐UVSQ Gif‐sur‐Yvette France
| | - Juan M. Posada
- Biology Department Faculty of Natural Sciences Universidad del Rosario Bogotá, D.C. Colombia
| | - Clément Stahl
- INRA UMR Ecofog AgroParisTech CNRS Cirad Université des AntillesUniversité de Guyane Kourou France
| | - Sabrina Coste
- UMR Ecofog AgroParisTech CNRS Cirad INRA Université de GuyaneUniversité des Antilles Kourou France
| | - Elodie A. Courtois
- Laboratoire Ecologie, évolution, interactions des systèmes amazoniens (LEEISA) CNRS IFREMER Université de Guyane Cayenne French Guiana
| | - Michael Obersteiner
- International Institute for Applied Systems Analysis (IIASA) Laxenburg Austria
| | - Jérôme Chave
- UMR 5174 Laboratoire Evolution et Diversité Biologique CNRS Université Paul Sabatier Toulouse France
| | | |
Collapse
|
15
|
Verryckt LT, Van Langenhove L, Ciais P, Courtois EA, Vicca S, Peñuelas J, Stahl C, Coste S, Ellsworth DS, Posada JM, Obersteiner M, Chave J, Janssens IA. Coping with branch excision when measuring leaf net photosynthetic rates in a lowland tropical forest. Biotropica 2020. [DOI: 10.1111/btp.12774] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
| | | | - Philippe Ciais
- Laboratoire des Sciences du Climat et de l’Environnement CEA‐CNRS‐UVSQ Gif‐sur‐Yvette France
| | - Elodie A. Courtois
- Laboratoire Ecologie, Évolution, Interactions des Systèmes Amazoniens (LEEISA) Université de Guyane CNRS IFREMER Cayenne French Guiana
| | - Sara Vicca
- Department of Biology University of Antwerp Wilrijk Belgium
| | - Josep Peñuelas
- CSIC Global Ecology CREAF‐CEAB‐CSIC‐UAB Cerdanyola del Valles Barcelona Spain
| | - Clément Stahl
- UMR Ecofog, AgroParisTech, CNRS, Cirad INRA Université des Antilles Université de Guyane Kourou France
| | - Sabrina Coste
- UMR Ecofog, AgroParisTech, CNRS, Cirad INRA Université des Antilles Université de Guyane Kourou France
| | - David S. Ellsworth
- Hawkesbury Institute for the Environment Western Sydney University Penrith NSW Australia
| | - Juan M. Posada
- Biology Department Faculty of Natural Sciences Universidad del Rosario Bogotá Colombia
| | - Michael Obersteiner
- International Institute for Applied Systems Analysis (IIASA) Laxenburg Austria
| | - Jérôme Chave
- UMR 5174 Laboratoire Evolution et Diversité Biologique Université Paul Sabatier CNRS Toulouse France
| | | |
Collapse
|
16
|
Levionnois S, Coste S, Nicolini E, Stahl C, Morel H, Heuret P. Scaling of petiole anatomies, mechanics and vasculatures with leaf size in the widespread Neotropical pioneer tree species Cecropia obtusa Trécul (Urticaceae). Tree Physiol 2020; 40:245-258. [PMID: 31976541 DOI: 10.1093/treephys/tpz136] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Revised: 11/28/2019] [Accepted: 12/18/2019] [Indexed: 06/10/2023]
Abstract
Although the leaf economic spectrum has deepened our understanding of leaf trait variability, little is known about how leaf traits scale with leaf area. This uncertainty has resulted in the assumption that leaf traits should vary by keeping the same pace of variation with increases in leaf area across the leaf size range. We evaluated the scaling of morphological, tissue-surface and vascular traits with overall leaf area, and the functional significance of such scaling. We examined 1,271 leaves for morphological traits, and 124 leaves for anatomical and hydraulic traits, from 38 trees of Cecropia obtusa Trécul (Urticaceae) in French Guiana. Cecropia is a Neotropical genus of pioneer trees that can exhibit large laminas (0.4 m2 for C. obtusa), with leaf size ranging by two orders of magnitude. We measured (i) tissue fractions within petioles and their second moment of area, (ii) theoretical xylem hydraulic efficiency of petioles and (iii) the extent of leaf vessel widening within the hydraulic path. We found that different scaling of morphological trait variability allows for optimisation of lamina display among larger leaves, especially the positive allometric relationship between lamina area and petiole cross-sectional area. Increasing the fraction of pith is a key factor that increases the geometrical effect of supportive tissues on mechanical rigidity and thereby increases carbon-use efficiency. We found that increasing xylem hydraulic efficiency with vessel size results in lower leaf lamina area: xylem ratios, which also results in potential carbon savings for large leaves. We found that the vessel widening is consistent with hydraulic optimisation models. Leaf size variability modifies scaling of leaf traits in this large-leaved species.
Collapse
Affiliation(s)
- Sébastien Levionnois
- UMR EcoFoG, AgroParisTech, CIRAD, CNRS, INRAE, UA, UG, 97379 Kourou Cedex, France
| | - Sabrina Coste
- UMR EcoFoG, AgroParisTech, CIRAD, CNRS, INRAE, UA, UG, 97379 Kourou Cedex, France
| | - Eric Nicolini
- UMR AMAP, CIRAD, CNRS, INRAE, IRD, Université de Montpellier, 34398 Montpellier, France
| | - Clément Stahl
- UMR EcoFoG, AgroParisTech, CIRAD, CNRS, INRAE, UA, UG, 97379 Kourou Cedex, France
| | - Hélène Morel
- UMR EcoFoG, AgroParisTech, CIRAD, CNRS, INRAE, UA, UG, 97379 Kourou Cedex, France
| | - Patrick Heuret
- UMR EcoFoG, AgroParisTech, CIRAD, CNRS, INRAE, UA, UG, 97379 Kourou Cedex, France
- UMR AMAP, CIRAD, CNRS, INRAE, IRD, Université de Montpellier, 34398 Montpellier, France
| |
Collapse
|
17
|
Ordon K, Coste S, Noel O, El-Ghayoury A, Ayadi A, Kassiba A, Makowska-Janusik M. Investigations of the charge transfer phenomenon at the hybrid dye/BiVO 4 interface under visible radiation. RSC Adv 2019; 9:30698-30706. [PMID: 35529348 PMCID: PMC9072168 DOI: 10.1039/c9ra05373e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2019] [Accepted: 09/20/2019] [Indexed: 11/21/2022] Open
Abstract
Photocatalytic hybrid systems were realized by associating bismuth vanadate (BiVO4) nanostructured thin films with anchored organic and metal-organic complex molecules. The chosen dyes are based on indoline and azo-based moieties. Optical and photoinduced charge transfer features were investigated experimentally and analysed theoretically through the electron band alignment on the organic/inorganic interface. Quantum calculations were carried out for the studied hybrid systems by using DFT and semi-empirical approaches. The calculations were performed by implementing a cluster model applied for the nanostructures and hybrid systems. The electronic density peculiarities point out efficient charge transfer for D149 based hybrids compared to azo-based systems. The electron distribution in hybrid systems inferred from the computational analysis and their experimental probing using Kelvin Force Microscopy (KFM) maps the way to understanding the photoinduced charge transfer occurring at the interfaces between organic dyes and an inorganic photocatalyst. The presented approach helps to predict suitable photoactive hybrid materials leading to efficient photocatalytic devices.
Collapse
Affiliation(s)
- K Ordon
- Institute of Physics, Faculty of Mathematics and Natural Science, Jan Dlugosz University in Czestochowa Al. Armii Krajowej 13/15 42200 Czestochowa Poland
| | - S Coste
- Institute of Molecules and Materials, Le Mans University 72085 Le Mans France
| | - O Noel
- Institute of Molecules and Materials, Le Mans University 72085 Le Mans France
| | - A El-Ghayoury
- Laboratoire MOLTECH-Anjou, UMR 6200, CNRS, UNIV Angers 2 bd Lavoisier 49045 Angers Cedex France
| | - A Ayadi
- Laboratoire MOLTECH-Anjou, UMR 6200, CNRS, UNIV Angers 2 bd Lavoisier 49045 Angers Cedex France
| | - A Kassiba
- Institute of Molecules and Materials, Le Mans University 72085 Le Mans France
| | - M Makowska-Janusik
- Institute of Physics, Faculty of Mathematics and Natural Science, Jan Dlugosz University in Czestochowa Al. Armii Krajowej 13/15 42200 Czestochowa Poland
| |
Collapse
|
18
|
Maréchaux I, Bonal D, Bartlett MK, Burban B, Coste S, Courtois EA, Dulormne M, Goret J, Mira E, Mirabel A, Sack L, Stahl C, Chave J. Dry‐season decline in tree sapflux is correlated with leaf turgor loss point in a tropical rainforest. Funct Ecol 2018. [DOI: 10.1111/1365-2435.13188] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Isabelle Maréchaux
- Laboratoire Evolution et Diversité Biologique UMR5174, CNRS, Université Paul Sabatier, IRD Toulouse Cedex 9 France
- AMAP, INRA, University of Montpellier, IRD, CIRAD, CNRS Montpellier France
- AgroParisTech‐ENGREF Paris France
| | - Damien Bonal
- Université de Lorraine, AgroParisTech, INRA, UMR Silva Nancy France
| | - Megan K. Bartlett
- Department of Ecology and Evolution University of California Los Angeles Los Angeles California
- Princeton Environmental Institute, Princeton University Princeton New Jersey
| | - Benoît Burban
- INRA, UMR EcoFoG, AgroParisTech, CNRS, CIRAD, Université des Antilles, Université de Guyane Kourou France
| | - Sabrina Coste
- Université de Guyane, UMR EcoFoG, AgroParisTech, CNRS, CIRAD, INRA, Université des Antilles Cayenne France
| | - Elodie A. Courtois
- Department of Biology University of Antwerp Wilrijk Belgium
- Laboratoire Écologie, évolution, interactions des systèmes amazoniens (LEEISA) Université de Guyane, CNRS Guyane Cayenne France
| | - Maguy Dulormne
- Université des Antilles, UMR EcoFoG, AgroParisTech, CNRS, CIRAD, INRA, Université de Guyane Pointe à Pitre France
| | - Jean‐Yves Goret
- INRA, UMR EcoFoG, AgroParisTech, CNRS, CIRAD, Université des Antilles, Université de Guyane Kourou France
| | - Eléonore Mira
- Université des Antilles, UMR EcoFoG, AgroParisTech, CNRS, CIRAD, INRA, Université de Guyane Pointe à Pitre France
| | - Ariane Mirabel
- Université de Guyane, UMR EcoFoG, AgroParisTech, CNRS, CIRAD, INRA, Université des Antilles Cayenne France
| | - Lawren Sack
- Department of Ecology and Evolution University of California Los Angeles Los Angeles California
| | - Clément Stahl
- INRA, UMR EcoFoG, AgroParisTech, CNRS, CIRAD, Université des Antilles, Université de Guyane Kourou France
- Department of Biology University of Antwerp Wilrijk Belgium
| | - Jérôme Chave
- Laboratoire Evolution et Diversité Biologique UMR5174, CNRS, Université Paul Sabatier, IRD Toulouse Cedex 9 France
| |
Collapse
|
19
|
Stansal A, Perrier E, Coste S, Bisconte S, Manen O, Lazareth I, Conard J, Priollet P. Risque veineux thromboembolique et sa prévention lors d’un rapatriement sanitaire. ACTA ACUST UNITED AC 2015; 40:391-4. [DOI: 10.1016/j.jmv.2015.10.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2015] [Accepted: 07/24/2015] [Indexed: 11/29/2022]
|
20
|
Biwolé AB, Dainou K, Fayolle A, Hardy OJ, Brostaux Y, Coste S, Delion S, Betti JL, Doucet JL. Light Response of Seedlings of a Central African Timber Tree Species,Lophira alata(Ochnaceae), and the Definition of Light Requirements. Biotropica 2015. [DOI: 10.1111/btp.12258] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Achille Bernard Biwolé
- Département Ingénierie des biosystèmes; Université de Liège; Gembloux Agro-Bio Tech; Axe Gestion des ressources forestières; Passage des Déportés 2 BE-5030 Gembloux Belgium
- Ecole Normale Supérieure d'Enseignement Technique; Université de Douala; BP 1872 Douala Cameroon
- Ecole Régionale Postuniversitaire d'Aménagement et de Gestion Intégrés des Forêts et Territoires Tropicaux; BP 15373 Kinshasa République Démocratique du Congo
| | - Kasso Dainou
- Département Ingénierie des biosystèmes; Université de Liège; Gembloux Agro-Bio Tech; Axe Gestion des ressources forestières; Passage des Déportés 2 BE-5030 Gembloux Belgium
- Laboratory of Applied Ecology; University of Abomey-Calavi; Cotonou Benin
| | - Adeline Fayolle
- Département Ingénierie des biosystèmes; Université de Liège; Gembloux Agro-Bio Tech; Axe Gestion des ressources forestières; Passage des Déportés 2 BE-5030 Gembloux Belgium
| | - Olivier J. Hardy
- Service d'Evolution Biologique et Ecologie; Université Libre de Bruxelles; 50 Av. F. Roosevelt CP160/12 1050 Bruxelles Belgium
| | - Yves Brostaux
- Gembloux Agro-Bio Tech; Unité de Statistique; Informatique et Mathématique appliquées; Université de Liège; Passage des Déportés 2 5030 Gembloux Belgium
| | - Sabrina Coste
- UMR Ecologie des Forêts de Guyane; Université de Guyane; BP 709 97387 Kourou Cedex France
| | - Sebastien Delion
- Wijma Cameroun SA; Bonandjo-Avenue Charles de Gaulle BP 1616 Douala Cameroon
| | - Jean Lagarde Betti
- Faculté des Science; Département de Biologie des Organismes Végétaux; Université de Douala; BP 24 157 Douala Cameroon
| | - Jean-Louis Doucet
- Département Ingénierie des biosystèmes; Université de Liège; Gembloux Agro-Bio Tech; Axe Gestion des ressources forestières; Passage des Déportés 2 BE-5030 Gembloux Belgium
- Ecole Régionale Postuniversitaire d'Aménagement et de Gestion Intégrés des Forêts et Territoires Tropicaux; BP 15373 Kinshasa République Démocratique du Congo
| |
Collapse
|
21
|
Fortin J, Bitar MP, Kintz P, Jabour S, Ouarame F, Ihadadene N, Coste S, Savio C. Intoxication collective par space cake : à propos de cinq cas cliniques. Toxicologie Analytique et Clinique 2014. [DOI: 10.1016/j.toxac.2014.09.028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
22
|
Fortin J, Paulin P, Coste S, Savio C, Payre J, Ravat F, Bodson L. Utilisation d’une solution polyamphotère lors d’accidents chimiques oculaires et cutanés : à propos de 11 utilisations. Toxicologie Analytique et Clinique 2014. [DOI: 10.1016/j.toxac.2014.09.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
23
|
Fortin J, Bitar MP, N’Guedia Kenfack F, Jabour S, Fortin L, Coste S, Savio C. Toxicité par Euphorbia lathyris : efficacité des solutions polyamphotères de lavage. Toxicologie Analytique et Clinique 2014. [DOI: 10.1016/j.toxac.2014.09.025] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
24
|
Vitalis V, Robert J, Coste S, Madec S, Hersan O, Bompard J, Colleu F, Bourrilhon C. Évacuations aéromédicales médicales militaires en Afrique entre 2001 et 2012 ; place du médecin urgentiste. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/j.annfar.2014.07.629] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
25
|
Abstract
Osteonecrosis of the jaw (ONJ) is a clinical condition associated with long-term exposure to inhibitors of bone resorption, mainly bisphosphonates. Denosumab (DMab) is a human monoclonal antibody of the receptor activator of nuclear factor kappa-B ligand. It prevents osteoclast-mediated bone resorption and is widely prescribed for the management of postmenopausal osteoporosis. Whereas ONJ has already been reported in women treated with DMab, we report for the first time the development of ONJ, following tooth extraction, in a male patient treated for idiopathic osteoporosis with DMab. Due to the constant increase in DMab prescription, for the management of osteoporosis, in both genders, physicians should be made aware of this potential risk.
Collapse
Affiliation(s)
- A. Neuprez
- Public Health, Epidemiology and Health Economics Department, University of Liège, Belgium, Liège, Belgium
- Bone and Cartilage Metabolism Unit, CHU, Liège, Belgium
- Motricity Sciences Department, CHU, Liège, Belgium
| | - S. Coste
- Gynecology Department, CHC St. Joseph, Liège, Belgium
| | - E. Rompen
- Stomatology Department, CHU, Liège, Belgium
| | | | - J. Y. Reginster
- Public Health, Epidemiology and Health Economics Department, University of Liège, Belgium, Liège, Belgium
- Bone and Cartilage Metabolism Unit, CHU, Liège, Belgium
- Motricity Sciences Department, CHU, Liège, Belgium
- Department of Public Health, Epidemiology and Health Economics, CHU Sart Tilman, Boulevard de l’Hôpital, 3 4000 Liège, Belgium
| |
Collapse
|
26
|
Coste S, Roggy JC, Schimann H, Epron D, Dreyer E. A cost-benefit analysis of acclimation to low irradiance in tropical rainforest tree seedlings: leaf life span and payback time for leaf deployment. J Exp Bot 2011; 62:3941-55. [PMID: 21511904 PMCID: PMC3134351 DOI: 10.1093/jxb/err092] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2010] [Revised: 03/03/2011] [Accepted: 03/09/2011] [Indexed: 05/12/2023]
Abstract
The maintenance in the long run of a positive carbon balance under very low irradiance is a prerequisite for survival of tree seedlings below the canopy or in small gaps in a tropical rainforest. To provide a quantitative basis for this assumption, experiments were carried out to determine whether construction cost (CC) and payback time for leaves and support structures, as well as leaf life span (i) differ among species and (ii) display an irradiance-elicited plasticity. Experiments were also conducted to determine whether leaf life span correlates to CC and payback time and is close to the optimal longevity derived from an optimization model. Saplings from 13 tropical tree species were grown under three levels of irradiance. Specific-CC was computed, as well as CC scaled to leaf area at the metamer level. Photosynthesis was recorded over the leaf life span. Payback time was derived from CC and a simple photosynthesis model. Specific-CC displayed only little interspecific variability and irradiance-elicited plasticity, in contrast to CC scaled to leaf area. Leaf life span ranged from 4 months to >26 months among species, and was longest in seedlings grown under lowest irradiance. It was always much longer than payback time, even under the lowest irradiance. Leaves were shed when their photosynthesis had reached very low values, in contrast to what was predicted by an optimality model. The species ranking for the different traits was stable across irradiance treatments. The two pioneer species always displayed the smallest CC, leaf life span, and payback time. All species displayed a similar large irradiance-elicited plasticity.
Collapse
Affiliation(s)
- Sabrina Coste
- AgroParisTech-ENGREF, INRA, UMR CIRAD-ENGREF-INRA-CNRS, ‘Ecologie des Forêts de Guyane’, Campus Agronomique de Kourou, 97387 Kourou, Guyane Française
- INRA, UMR1137, ‘Ecologie et Ecophysiologie Forestières’, Centre INRA de Nancy, F-54280 Champenoux, France
| | - Jean-Christophe Roggy
- AgroParisTech-ENGREF, INRA, UMR CIRAD-ENGREF-INRA-CNRS, ‘Ecologie des Forêts de Guyane’, Campus Agronomique de Kourou, 97387 Kourou, Guyane Française
| | - Heidy Schimann
- AgroParisTech-ENGREF, INRA, UMR CIRAD-ENGREF-INRA-CNRS, ‘Ecologie des Forêts de Guyane’, Campus Agronomique de Kourou, 97387 Kourou, Guyane Française
| | - Daniel Epron
- INRA, UMR1137, ‘Ecologie et Ecophysiologie Forestières’, Centre INRA de Nancy, F-54280 Champenoux, France
- Nancy-Université, Université Henri Poincaré, UMR1137, ‘Ecologie et Ecophysiologie Forestières’, Faculté des Sciences, F-54500 Vandoeuvre les Nancy, France
| | - Erwin Dreyer
- INRA, UMR1137, ‘Ecologie et Ecophysiologie Forestières’, Centre INRA de Nancy, F-54280 Champenoux, France
- Nancy-Université, Université Henri Poincaré, UMR1137, ‘Ecologie et Ecophysiologie Forestières’, Faculté des Sciences, F-54500 Vandoeuvre les Nancy, France
| |
Collapse
|
27
|
Audren A, Ha-Thi MH, Coste S, Leconte Y. Synthesis of new materials by laser pyrolysis: ZrO2, Y2O3:Ce and TiC(x)N(y) nanoparticles. J Nanosci Nanotechnol 2010; 10:6216-6221. [PMID: 21133177 DOI: 10.1166/jnn.2010.2566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
New developments concerning the synthesis of oxide and non oxide nanoparticles by laser pyrolysis are reported here. In order to be able to study the relations between the host and the guest in doped nanostructured luminescent oxide matrix, tetragonal ZrO2 nanoparticles were synthesized with sizes as low as 3 nm in weighable amounts. Y2O3 nanoparticles doped with Ce were also prepared with grains in the 10-20 nm size range. Concerning the non-oxide materials, TiC, TiN, and TiC(x)N(y) nanopowders were obtained from simple annealing treatments performed on TiO2/C nanocomposites grown by laser pyrolysis. The final crystalline phase was controlled by the initial C content and the annealing atmosphere. Once sintered, these materials will allow the study of the mechanical properties of nanostructured carbonitride ceramics.
Collapse
Affiliation(s)
- A Audren
- CEA, IRAMIS, SPAM, Laboratoire Francis Perrin, 91191 Gif-sur-Yvette, France
| | | | | | | |
Collapse
|
28
|
Tourtier JP, Leclerc T, Cirodde A, Coste S, Man M, Borne M. Effets de l’altitude sur les performances du ventilateur LTV-1000™. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/j.jeur.2010.07.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
29
|
Coste S, Tourtier J, Daudé C, Viaggi M, Morgand E, Borne M. Aeromedical evacuation of the French Army: survey of the past 10 years. Crit Care 2010. [PMCID: PMC2933993 DOI: 10.1186/cc8506] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
|
30
|
Tourtier J, Coste S, Fontaine E, Libert N, Viaggi M, Forsans E, Borne M. Auscultation in flight: comparison of amplified and traditional stethoscopes. Crit Care 2010. [PMCID: PMC2934212 DOI: 10.1186/cc8504] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
|
31
|
Abstract
Homogeneous, transparent, and mechanically rigid gels have been successfully synthesized in the tellurium isopropoxide-isopropanol-citric acid and water system. The sol to gel transition and the gels microstructure have been studied by using small angle X-ray scattering (SAXS) experiments. For any value of the two key synthesis parameters, which are the citric acid ratio and the alkoxide concentration, very small Te-rich elementary particles, about 1-1.5 nm in radius, form immediately when the water is added, leading to colloidal sols. During gelation, these elementary particles stick progressively together to build up fractal aggregates by a pure hierarchical aggregation process which has been identified as a reaction-limited cluster aggregation (RLCA) mechanism. The SAXS curve analysis, based on scaling concepts, shows that the gelling network exhibits a time and length scale invariant structure factor characterized by self-similarity. This self-similarity is also displayed for a wide range of chemical compositions and the gel microstructures only differ in their fractal aggregate size according to the tellurium isopropoxide concentration as well as the citric acid ratio.
Collapse
Affiliation(s)
- S Coste
- Science des Procédés Céramiques et de Traitements de Surface, UMR 6638-CNRS, ENSCI, Faculte des Sciences et Techniques de Limoges, 123 Avenue Albert Thomas, 87060 Limoges Cedex, France
| | | | | | | |
Collapse
|
32
|
Cochard H, Coste S, Chanson B, Guehl JM, Nicolini E. Hydraulic architecture correlates with bud organogenesis and primary shoot growth in beech (Fagus sylvatica). Tree Physiol 2005; 25:1545-52. [PMID: 16137940 DOI: 10.1093/treephys/25.12.1545] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
In beech (Fagus sylvatica L.), the number of leaf primordia preformed in the buds determines the length and the type (long versus short) of annual growth units, and thus, branch growth and architecture. We analyzed the correlation between the number of leaf primordia and the hydraulic conductance of the vascular system connected to the buds. Terminal buds of short growth units and axillary buds of long growth units on lower branches of mature trees were examined. Buds with less than four and more than five leaf primordia formed short and long growth units, respectively. Irrespective of the type of growth unit the bud was formed on, the occurrence of a large number of leaf primordia was associated with high xylem hydraulic conductance. Xylem conductance was correlated to the area of the outermost annual ring. These results suggest that organogenesis and primary growth in buds correlates with secondary growth of the growth units and thus with their hydraulic architecture. Possible causal relationships between the variables are discussed.
Collapse
Affiliation(s)
- Hervé Cochard
- UMR PIAF, INRA-UBP, INRA Site de Crouël, 234 avenue du Brézet, 63039 Clermont-Ferrand, France.
| | | | | | | | | |
Collapse
|
33
|
Coste S, Roggy JC, Imbert P, Born C, Bonal D, Dreyer E. Leaf photosynthetic traits of 14 tropical rain forest species in relation to leaf nitrogen concentration and shade tolerance. Tree Physiol 2005; 25:1127-37. [PMID: 15996956 DOI: 10.1093/treephys/25.9.1127] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Variability of leaf traits related to photosynthesis was assessed in seedlings from 14 tree species growing in the tropical rain forest of French Guiana. Leaf photosynthetic capacity (maximum rate of carboxylation and maximum rate of electron transport) was estimated by fitting a biochemical model of photosynthesis to response curves of net CO2 assimilation rate versus intercellular CO2 mole fraction. Leaf morphology described by leaf mass per unit leaf area (LMA), density and thickness, as well as area- and mass-based nitrogen (N) and carbon (C) concentrations, were recorded on the same leaves. Large interspecific variability was detected in photosynthetic capacity as well as in leaf structure and leaf N and C concentrations. No correlation was found between leaf thickness and density. The correlations between area- and mass-based leaf N concentration and photosynthetic capacity were poor. Conversely, the species differed greatly in relative N allocation to carboxylation and bioenergetics. Principal component analysis (PCA) revealed that, of the recorded traits, only the computed fraction of total leaf N invested in photosynthesis was tightly correlated to photosynthetic capacity. We also used PCA to test to what extent species with similar shade tolerances displayed converging leaf traits related to photosynthesis. No clear-cut ranking could be detected among the shade-tolerant groups, as confirmed by a one-way ANOVA. We conclude that the large interspecific diversity in photosynthetic capacity was mostly explained by differences in the relative allocation of N to photosynthesis and not by leaf N concentration, and that leaf traits related to photosynthetic capacity did not discriminate shade-tolerance ranking of these tropical tree species.
Collapse
Affiliation(s)
- Sabrina Coste
- Unité Mixte de Recherche CIRAD-ENGREF-INRA-CNRS Ecologie des Forêts de Guyane, Campus agronomique de Kourou, 97387 Kourou, French Guiana
| | | | | | | | | | | |
Collapse
|
34
|
Coste S, Ryvlin P, Hermier M, Ostrowsky K, Adeleine P, Froment JC, Mauguière F. Temporopolar changes in temporal lobe epilepsy: A quantitative MRI-based study. Neurology 2002; 59:855-61. [PMID: 12297566 DOI: 10.1212/wnl.59.6.855] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
OBJECTIVES To quantify the morphologic changes of temporopolar structures to better understand the pathophysiology of anterior temporal white matter increased T2 signal observed in temporal lobe epilepsy (TLE). METHODS MRI was performed in 30 patients with TLE and in 30 normal control subjects and independently assessed by visual analysis and quantitative measurements. Specifically, the temporal pole (TP) volume, as well as its gray and white matter components, was measured using three-dimensional T1 MR images and a semiautomatic protocol. The authors tested whether the presence of an increased T2-weighted signal in the anterior temporal white matter was associated with significant TP atrophy. The associations between the TP volume and MRI signs of hippocampal sclerosis, age at onset, seizure frequency, duration of illness, and a history of febrile convulsions were also studied. RESULTS Both right and left TLE populations demonstrated a reduction of the temporopolar white and gray matter volumes ipsilateral to seizure onset (p < 0.02 in right TLE; p < 0.0001 in left TLE). Twenty-two patients (72%) exhibited significantly abnormal TP volume measurements, which correctly lateralized the epileptogenic zone in all cases. The presence of an increased T2-weighted signal in the anterior temporal white matter (ISWM), but not that of hippocampal sclerosis, was associated with a greater TP volume asymmetry index (p < 0.05). CONCLUSIONS The temporal pole is frequently atrophic ipsilateral to seizure onset in refractory TLE. The association between TP atrophy and ISWM suggests that both abnormalities might derive from a common pathologic process.
Collapse
Affiliation(s)
- S Coste
- Department of Functional Neurology and Epilepsy, Neurological Hospital, Lyon, France
| | | | | | | | | | | | | |
Collapse
|
35
|
Coste S, De Greslan T, Renard JL, Béquet D, Felten D. [Acute polyradiculoneuropathy after Chlamydia pneumoniae infection]. Rev Neurol (Paris) 2002; 158:361-3. [PMID: 11976599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Abstract
A 36-year-old woman presented acute polyradiculoneuropathy following Chlamydia pneumoniae infection. Although electrophysiologic studies were normal, clinical features were typical of Guillain-Barré syndrome (GBS). Anti-ganglioside GM1 antibodies were positive. Two other cases of GBS following Chlamydia pneumoniae infection have been reported, but no specific feature emerges. Outcome was good in our patient after intravenous globulin then antibiotic therapy. Our case supports the notion that Chlamydia pneumoniae infection can induce GBS. The association is probably underestimated.
Collapse
Affiliation(s)
- S Coste
- Service de Neurologie, Hôpital du Val-de-Grâce, Paris, France
| | | | | | | | | |
Collapse
|
36
|
De Greslan T, Coste S, Ferreira A, Renard JL, Béquet D, Felten D. [Radicular pain revealing Hodgkin's disease]. Rev Neurol (Paris) 2001; 157:1430-2. [PMID: 11924013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Abstract
We report on a case of Hodgkin's disease, revealed in a 52 year-old woman by isolated neurological signs. Sciatica is an uncommon pattern of discovery that is particularly misleading. It may lead to a delayed diagnosis all the more prejudicial since it discloses an advanced stage of the disease. The neurological involvement is always associated with a bone lesion. This latter can be discovered at an early stage through magnetic resonance imaging.
Collapse
Affiliation(s)
- T De Greslan
- Service de Neurologie, Hôpital du Val-de-Grâce, Paris
| | | | | | | | | | | |
Collapse
|
37
|
Koo HJ, Whangbo MH, Coste S, Jobic S. Spin Dimer Analysis for Antiferromagnetic Spin Exchange Interactions of Magnetic Solids with Several Unpaired Electrons per Spin Site: Trends in the Spin Exchange Parameters of the Compounds Consisting of MnF5 Chains and CrX2 (X=O, S) Layers. J SOLID STATE CHEM 2001. [DOI: 10.1006/jssc.2000.9025] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
38
|
Quittet P, Coste S, Faucherre V, Ramos J, Ciurana A, Brunel M. Mésothéliome péritonéal: 2 ans de réflexion. Rev Med Interne 1996. [DOI: 10.1016/s0248-8663(97)81025-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
39
|
Coste S. [Disinsertion of the subscapular muscle instead of anterior capsulotomy in the surgical treatment of blockage of internal rotation of the shoulder caused by obstetric paralysis of the brachial plexus]. Bull Mem Soc Chir Paris 1965; 55:405-19. [PMID: 5881394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
|