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Inheritance patterns of secondary symbionts during sexual reproduction of pea aphid biotypes

Insect Science 2014年第3期21卷 291-300页

作者： Jean Peccoud Joêl Bonhomme Frédérique Mahéo Manon de la Huerta Olivier Cosson Jean-christophe Simon INRA Institut de Génétique Environnement et Protection des Plantes (UMR IGEPP) Domaine de La Motte 35653 le Rheu cedex France

Herbivorous insects frequently harbor bacterial symbionts that affect their ecol- ogy and evolution. Aphids host the obligatory endosymbiont Buchnera, which is requiredfor reproduction, together with facultative symbionts whose frequencies vary across aphid populations. These maternally transmitted secondary symbionts have been particularlystudied in the pea aphid, Acyrthosiphon pisum, which harbors at least 8 distinct bacterial species （not counting Buchnera） having environmentally dependent effects on host *** particular, these symbiont species are associated with pea aphid populations feeding on specific plants. Although they are maternally inherited, these bacteria are occasionallytransferred across insect lineages. One mechanism of such nonmaternal transfer is paternal transmission to the progeny during sexual reproduction. To date, transmission of secondarysymbionts during sexual reproduction of aphids has been investigated in only a handful of aphid lineages and 3 symbiont species. To better characterize this process, we investigatedinheritance patterns of 7 symbiont species during sexual reproduction of pea aphids through a crossing experiment involving 49 clones belonging to 9 host-specialized biotypes, and117 crosses. Symbiont species in the progeny were detected with diagnostic qualitative PCR at the fundatrix stage hatching from eggs and in later parthenogenetic *** found no confirmed case of paternal transmission of symbionts to the progeny, and we observed that maternal transmission of a particular symbiont species （Serratia symbiotica）was quite inefficient. We discuss these observations in respect to the ecology of the pea aphid.

关键词： bacteria Homoptera paternal inheritance phytophagous insects symbiosis transmission failure

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Prediction of Extractable Cd,Pb and Zn in Contaminated Woody Habitat Soils Using a Change Point detection Method

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Pedosphere 2016年第3期26卷 282-298页

作者： christophe WATERLOT Christelle PRUVOT Géraldine BIDAR Clémentine FRITSCH Annette de VAUFLEURY Renaud SCHEIFLER Francis DOUAY Groupe ISA Laboratoire Genie Civil et geo-Environnement(LGCgE)Lille 59046(France) departement Chrono-Environment UMR UFC/CNRS 6249 USC INRAUniversite Bourgogne Franche-ComteBesancon 25030(France)

Accumulation of heavy metals in soils poses a potential risk to plant production, which is related to availability of the metals in soil. The phytoavailability of metals is usually evaluated using extracting solutions such as salts, acids or chelates. The purpose of this study was to identify the most significant soil parameters that can be used to predict the concentrations of acetic and citric acidextractable cadmium(Cd), lead(Pb) and zinc(Zn) in contaminated woody habitat topsoils. Multiple linear regression models were established using two analysis strategies and three sets of variables based on a dataset of 260 soil samples. The performance of these models was evaluated using statistical parameters. Cation exchange capacity, CaCO_3, organic matter, assimilated P, free Al oxide,sand and the total metal concentrations appeared to be the main soil parameters governing the solubility of Cd, Pb and Zn in acetic and citric acid solutions. The results strongly suggest that the metal solubility in extracting solutions is extractable concentrationdependent since models were overall improved by incorporating a change point. This change point detection method was a powerful tool for predicting extractable Cd, Pb and Zn. Suitable predictions of extractable Cd, Pb and Zn concentrations were obtained, with correlation coefficient(adjusted r) ranging from 0.80 to 0.99, given the high complexity of the woody habitat soils studied. Therefore,the predictive models can constitute a decision-making support tool for managing phytoremediation of contaminated soils, making recommendations to control the potential bioavailability of metals. The relationships between acetic and/or citric acid-extractable concentrations and the concentrations of metals into the aboveground parts of plants need to be predicted, in order to make their temporal monitoring easier.

关键词： acetic acid citric acid contaminated soil extractability metals multiple linear regression model soil parameters

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A note on the regularity of the holes for permeability property through a perforated domain for the 2D Euler equations:dedicated to Professor Jean-Yves Chemin on the Occasion of His 60th Birthday

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Science China Mathematics 2019年第6期62卷 1121-1142页

作者： christophe lacave Chao Wang Institut Fourier Université Grenoble AlpesCNRS School of Mathematical Sciences Peking University

For equations of order two with the Dirichlet boundary condition, as the laplace problem, the Stokes and the Navier-Stokes systems, perforated domains were only studied when the distance between the holes d_ε is equal to or much larger than the size of the holes ε. Such a diluted porous medium is interesting because it contains some cases where we have a non-negligible effect on the solution when(ε, d_ε) →(0, 0).Smaller distances were avoided for mathematical reasons and for these large distances, the geometry of the holes does not affect or rarely affect the asymptotic result. Very recently, it was shown for the 2D-Euler equations that a porous medium is non-negligible only for inter-holes distances much smaller than the sizes of the *** this result, the boundary regularity of holes plays a crucial role, and the permeability criterion depends on the geometry of the lateral boundary. In this paper, we relax slightly the regularity condition, allowing a corner, and we note that a line of irregular obstacles cannot slow down a perfect fluid in any regime such thatε ln d_ε→ 0.

关键词： ideal fluids homogenization in perforated domains shrinking obstacles and the porous medium domains with corners

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Redox and acetylation coordinate ABA-independent osmotic stress response

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Molecular Plant 2022年第4期15卷 583-585页

作者： christophe Belin Jean-Philippe Reichheld laboratoire Génome et Développement des Plantes UniversitéPerpignan Via Domitia66860 PerpignanFrance laboratoire Génome et Développement des Plantes CNRS66860 PerpignanFrance

Osmotic stress caused by drought or high salt concentrations is a major threat that limits plant development and affect crop *** the context of climate change,understanding the mechanisms by which plants perceive their environment to adapt to their development is a major question.A common feature of plants being exposed to osmotic stress is the accumulation of excessive reactive oxygen species(ROS)(Martinière et al.,2019).ROS can oxidatively damage biological molecules,such as nucleic acids,proteins,and lipids,but also play important signaling *** protect from ROS-induced oxidation,living organisms have developed a large panel of enzymatic and non-enzymatic systems to remove ROS and oxidized molecules.

关键词： functions. enzymatic coordinate

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Approximation Properties of Vectorial Exponential Functions

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Communications on Applied Mathematics and Computation 2024年第3期6卷 1801-1831页

作者： christophe Buet Bruno despres Guillaume Morel CEA DAMDIF91297 ArpajonFrance laboratoire en Informatique Haute Performance Pour le Calcul et la Simulation CEAUniversitéParis-Saclay91680 Bruyeres-le-ChatelFrance laboratoire Jacques-Louis Lions UMR 7598Sorbonne Universite75005 ParisFrance IMT Atlantique 29238 BrestFrance

This contribution is dedicated to the celebration of Rémi Abgrall’s accomplishments in Applied Mathematics and Scientific Computing during the conference“Essentially Hyperbolic Problems:Unconventional Numerics,and Applications”.With respect to classical Finite Elements Methods,Trefftz methods are unconventional methods because of the way the basis functions are *** discontinuous Galerkin(TDG)methods have recently shown potential for numerical approximation of transport equations[6,26]with vectorial exponential *** paper focuses on a proof of the approximation properties of these exponential *** show that vectorial exponential functions can achieve high order *** fundamental part of the proof consists in proving that a certain rectangular matrix has maximal rank.

关键词： Trefftz method Transport equation Vectorial exponential functions

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Chemical Availability of Cd, Pb and Zn in Anthropogenically Polluted Soil: Assessing the Geochemical Reactivity and Oral Bioaccessibility

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Pedosphere 2017年第3期27卷 616-629页

作者： christophe WATERLOT Francis DOUAY Aurélie PELFRENE Yncréa Hauts-de-France Laboratoire Génie Civil et géo Environnement (LGCgE)

The most recent in vitro tests used to determine metal bioaccessiblility are generally time-consuming and expensive. This study aimed at determining potential relationships between the concentrations of metals extracted using single-extraction methods and the concentrations of bioaccessible metals assessed by a harmonised in vitro test, the Unified BARGE Method （UBM）. A total number of 27 soil samples were collected from kitchen gardens and lawns with various physicochemical parameters and contamination levels. Significant relationships were obtained between Cd, Pb and Zn extracted in gastric and gastrointestinal phases and using single extractions. The best relationhips were established using acetic and citric acids for Cd, whereas for Pb, citric acid and ethylenedi- aminetetraacetic acid （EDta） were identified as the best extractants. These relationships were improved by means of a linear multiple regression with a downward stepwise procedure involving agronomic parameters （soil cation exchange capacity and assimilated P）. This method highlighted the fact that the cation exchange capacity and P contents in soils were the two main parameters that controlled the human bioaccessibility of Cd, Pb and Zn in the gastric phase. Besides, the metal concentrations extracted with the acetic and citric acids correlated well with the metal concentrations in the gastric and gastrointestinal phases, suggesting that the bioaceessible metals were mainly in a soluble form, weakly bound to the organic matter and associated with the carbonates and the Fe and Mn oxides/hydroxides in soils.

关键词： gastric phase gastrointestinal phase linear multiple regression single extractant urban soil

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Small-world networks of neuroblastoma cells cultured in three-dimensional polymeric scaffolds featuring multi-scale roughness

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Neural Regeneration Research 2020年第4期15卷 759-768页

作者： Valentina Onesto Angelo Accardo christophe Vieu Francesco Gentile Center for Advanced Biomaterials for Healthcare Italian Institute of TechnologyNaplesItaly laboratoire d’Analyse et d’Architecture des Systemes(laAS) Centre National de la Recherche ScientifiqueUniversite de ToulouseCNRSToulouseFrance Institut National des Sciences Appliquees–INSA ToulouseFrance department of Electric Engineering and Information Technology University Federico IINaplesItaly department of Precision and Microsystems Engineering Delft University of TechnologyMekelweg 22628 CD DelftThe Netherlands

Understanding the mechanisms underlying cell-surface interaction is of fundamental importance for the rational design of scaffolds aiming at tissue engineering,tissue repair and neural regeneration ***,we examined patterns of neuroblastoma cells cultured in three-dimensional polymeric scaffolds obtained by two-photon *** of the intrinsic resolution of the technique,the micrometric cylinders composing the scaffold have a lateral step size of^200 nm,a surface roughness of around 20 nm,and large values of fractal dimension approaching *** found that cells in the scaffold assemble into separate groups with many elements per *** cell wiring,we found that resulting networks exhibit high clustering,small path lengths,and small-world *** values of the topological characteristics of the network can potentially enhance the quality,quantity and density of information transported in the network compared to equivalent random graphs of the same *** is one of the first direct observations of cells developing into 3D small-world networks in an artificial matrix.

关键词： 3D networks biomaterials nano-topography network topology neuro-regeneration small-world networks tissue engineering two-photon lithography

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Rule-based scheduling of air conditioning using occupancy forecasting

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Energy and AI 2020年第2期2卷 43-53页

作者： Marina Dorokhova christophe Ballif Nicolas Wyrsch Photovoltaics and Thin-Film Electronics laboratory(PV-lab)Ecole Polytechnique Federale de lausanne(EPFL) Institute of Microengineering(IMT)Rue de la Maladière 71bNeuchatel 2000Switzerland

Heating,ventilation and air conditioning systems represent considerable potential for energy savings,which can be realized through intelligent occupancy-centered control *** this work,both supervised and unsupervised algorithms to forecast occupancy are proposed with the highest accuracies of 98.3%and 97.6%,*** on their output,a rule-based air conditioning scheduling technique is *** an example,a potential of 15.4%of energy savings is calculated using a dataset collected in a mid-size(4000 m 2)building in Portugal.

关键词： Automation Energy savings HVAC control Occupancy forecasting Thermal comfort

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Involvement of chemosensory proteins in host plant searching in the bird cherry-oat aphid

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Insect Science 2021年第5期28卷 1338-1353页

作者： Xiong Peng lang Liu Yi-Xiao Huang Su-Ji Wang de-Xian Li Shu-Ting Chen Jean-christophe Simon Ming-Jing Qu Mao-Hua Chen State Key laboratory of Crop Stress Biology for Arid Areas Key Laboratory of Crop Pest Integrated Pest Management on the Loess Plateau of Ministry of Agriculture and Rural AffairsNorthwest A&F UniversityYang lingShaanxi Province712100China IGEPP UMR 1349 INRAAgrocampus OuestUniv Rennes 1F-35653 Domaine De La MotteLe RheuFrance Shandong Academy of Agricultural Sciences Shandong Peanut Research InstituteQingdaoShandong266100China

Chemosensory systems are considered to play an important role in host plant selection in herbivorous ***,few studies have focused on chemosensory proteins(CSPs)for aphid host-location *** roles of CSPs in searching for different Poaceae species(wheat,barley,triticale,maize and sorghum)were tested in Rhopalosiphum padi,an important cereal *** olfactometer assays showed that *** responds to plant *** *** CSP genes were *** of aphid morph,tissue and starvation state on expression patterns of CSPs was *** levels of CSPI,CSP4,CSP5 and CSP6 in winged aphids were significantly higher than those in wingless *** levels of four genes(CSPI,CSP4,CSP5 and CSP6)were relatively higher in the head with antennae,and the four genes tended to be upregulated follow ing *** of three CSPs(CSP4,CSP5 and CSP6)altered aphid host-location behavior in response to the five different host plants *** volatile compounds of host plants(octanal,[E]-2-hexenol and linalool)have signif-icant attraction to winged *** according to the four-arm olfactometer *** docking predicted hydrogen bonding sites which played key roles in the binding of CSP4,CSP5 and CSP6 with volatile *** of CSP4 or CSP5 significantly decreased the staying time of *** in the arms with ***,knockdown of CSP6 could not affect the response of *** to *** results bring evidence for the involvement of three CSPs in *** host-location behavior.

关键词： host choice experiment olfactometer Rhopalosiphum padi RNAi starvation wing form

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AnAll-Regime lagrange-Projection Like Scheme for the Gas Dynamics Equations on Unstructured Meshes

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Communications in Computational Physics 2016年第6期20卷 188-233页

作者： christophe Chalons Mathieu Girardin Samuel Kokh LMV-UMR 8100 Univ.Versailles Saint-Quentin-en-YvelinesUFR des SciencesBatiment Fermat45 avenue des Etats-Unis78035 Versailles cedexFrance deN/DANS/DM2S/STMF/LMEC CEA Saclay bat.454 PC 4791191 Gif sur Yvette CedexFrance LRC MANON Laboratoire de Recherche Conventionne CEA/DEN/DANS/DM2S and UPMC-CNRS/LJLL Maison de la Simulation USR 3441 Digiteo Labsbat.565PC 190CEA Saclay91191 Gif-sur-YvetteFrance deN/DANS/DM2S/STMF CEA Saclay91191 Gif-sur-YvetteFrance

We propose an all regime lagrange-Projection like numerical scheme for the gas dynamics *** all regime,we mean that the numerical scheme is able to compute accurate approximate solutions with an under-resolved discretization with respect to the Mach number M,*** that the ratio between the Mach number M and the mesh size or the time step is small with respect to *** key idea is to decouple acoustic and transport phenomenon and then alter the numerical flux in the acoustic approximation to obtain a uniform truncation error in term of *** modified scheme is conservative and endowed with good stability properties with respect to the positivity of the density and the internal energy.A discrete entropy inequality under a condition on the modification is obtained thanks to a reinterpretation of the modified scheme in the Harten lax and van Leer formalism.A natural extension to multi-dimensional problems discretized over unstructured mesh is *** a simple and efficient semi implicit scheme is also *** resulting scheme is stable under a CFL condition driven by the(slow)material waves and not by the(fast)acoustic waves and so verifies the all regime *** evidences are proposed and show the ability of the scheme to deal with tests where the flow regime may vary from low to high Mach values.

关键词： Gas dynamics equations low-Mach regime finite volume schemes all-regime schemes lagrange-Projection like schemes large time-steps

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