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Registros recuperados: 18
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A new hypothesis to explain the coexistence of n species in the presence of a single resource Inra
Lobry, C.; Harmand, J..
Cet article présente une hypothèse permettant d’expliquer la coexistence de plusieurs espèces (ici des micro-organismes) en compétition sur une seule ressource (substrat) dans un chémostat. Nous introduisons une nouvelle classe de cinétiques qui ne dependent pas seulement de la concentration en substrat du milieu, mais également des concentrations en microorganismes. À partir de considérations relatives aux interactions élémentaires (i) entre microorganismes, (ii) entre microorganismes et le milieu dans lequel ils croissent, et en utilisant des simulations, nous montrons que cette modélisation peut être interprétée comme une limitation diffusionnelle. L’étude rigoureuse de cette nouvelle classe de modèles nous permet d’avancer l’hypothèse selon laquelle...
Tipo: Journal Article Palavras-chave: COEXISTENCE D’ESPÈCES; RATIO-DÉPENDANCE; DENSITÉ-DÉPENDANCE; LIMITATION DIFFUSIONNELLE COMPETITION; BIOLOGY; MICROBIAL ECOLOGY; SPECIES COEXISTENCE; RATIO-DEPENDENCE; DENSITY-DEPENDENCE; LIMITATION BY DIFFUSION.
Ano: 2006 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD201049ac0e09&uri=/notices/prodinra1/2011/01/
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Association between competition and obligate mutualism in a chemostat Inra
El Hajji, M.; Harmand, J.; Chaker, H.; Lobry, C..
In this paper, we consider a simple chemostat model involving two obligate mutualistic species feeding on a limiting substrate. Systems of differential equations are proposed as models of this association. A detailed qualitative analysis is carried out. We show the existence of a domain of coexistence, which is a set of initial conditions in which both species survive. We demonstrate, under certain supplementary assumptions, the uniqueness of the stable equilibrium point which corresponds to the coexistence of the two species.
Tipo: Journal Article Palavras-chave: SURVIE DES ESPECES; COMPORTEMENT ASYMPTOTIQUE; EQUATION DIFFERENTIELLE; INTERACTION MICROBIOLOGIQUE MICROBIAL INTERACTIONS; MICROBIAL ECOLOGY; YEAST; SACCHAROMYCES CEREVISIAE; CHEMOSTAT; COMPETITION; MUTUALISM; ASYMPTOTIC BEHAVIOUR; COEXISTENCE; DULAC CRITERION; THIEME’S RESULT; ;  .
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD201035ecf34a&uri=/notices/prodinra1/2010/12/
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Biological control of the chemostat with nonmonotonic response and different removal rates Inra
Rapaport, A.; Harmand, J..
We show the global stabilization of the chemostat with nonmonotonic growth, adding a new species as a "biological" control, in presence of different removal rates for each species. This result is obtained by an extension of the Competitive Exclusion Principle in the chemostat, for the case of two species with different removal rates and at least one nonmonotonic response.
Tipo: Journal Article Palavras-chave: STABILISATION GLOBALE; CONTROLE MICROBIOLOGIQUE CHEMOSTAT; COMPETITION EXCLUSION; GLOBAL STABILIZATION.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20083b5844db&uri=/notices/prodinra1/2010/12/
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Coexistence in the design of a series of two chemostats Inra
Rapaport, A.; Harmand, J.; Mazenc, F..
We revisit the design problem of series of two chemostats, when more than one species are present for a single resource. We give precise conditions under which coexistence of two species is possible for such configurations. Furthermore, we show that for a broad class of growth functions, the optimal design cannot sustain coexistence of more than one species (either a new species is rejected or it invades the whole system)
Tipo: Journal Article Palavras-chave: COEXISTENCE DES ESPECES; PRINCIPE D’EXCLUSION CHEMOSTAT MODEL; EXCLUSION PRINCIPLE; COEXISTENCE.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2008105d1982&uri=/notices/prodinra1/2010/12/
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Denaturing gradient electrophoresis (DGE) and single-strand conformation polymorphism (SSCP) molecular fingerprintings revisited by simulation and used as a tool to measure microbial diversity Inra
Loisel, P.; Harmand, J.; Zemb, O.; Latrille, E.; Lobry, C.; Delgenes, J.P.; Godon, J.J..
The exact extent of microbial diversity remains unknowable. Nevertheless, fingerprinting patterns [denaturing gradient electrophoresis (DGE), single-strand conformation polymorphism (SSCP)] provide an image of a microbial ecosystem and contain diversity data. We generated numerical simulation fingerprinting patterns based on three types of distribution (uniform, geometric and lognormal) with a range of units from 10 to 500 000. First, simulated patterns containing a diversity of around 1000 units or more gave patterns similar to those obtained in experiments. Second, the number of bands or peaks saturated quickly to about 35 and were unrelated to the degree of diversity. Finally, assuming lognormal distribution, we used an estimator of diversity on in...
Tipo: Journal Article Palavras-chave: DENATURING GRADIENT ELECTROPHORESIS; SINGLE STRAND CONFORMATION POLYMORPHISM.
Ano: 2006 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2007ca36bcb3&uri=/notices/prodinra1/2008/02/
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Design of continuous bioprocesses and biodiversity Inra
Rapaport, A.; Harmand, J.; Mazenc, F..
We revisit the design problem of series of bioreactors, when more than one species is in competition for a single resource. We give precise conditions under which coexistence of two species is possible for such configurations. Furthermore, we show that for a broad class of growth functions, the optimal design cannot sustain coexistence of more than one species (either a new species is rejected or it invades the whole system).
Tipo: Conference Paper Palavras-chave: AUTOMATIQUE; BIOPROCEDE; ROBOTIQUE BIOPROCESS; BIOREACTOR; OPTIMAL DESIGN.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200858398fc7&uri=/notices/prodinra1/2008/08/
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Further results on stabilization of periodic trajectories for a chemostat with two species Inra
Mazenc, F.; Malisoff, M.; Harmand, J..
We discuss an important class of problems involving the tracking of prescribed trajectories in the chemostat model. We provide new tracking results for chemostats with two species and one limiting substrate, based on Lyapunov function methods. In particular, we use a linear feedback control of the dilution rate and an appropriate time-varying substrate input concentration to produce a locally exponentially stable oscillatory behavior. This means that all trajectories for the nutrient and corresponding species concentrations in the closed loop chemostat that stay near the oscillatory reference trajectory are attracted to the reference trajectory exponentially fast. We also obtain a globally stable oscillatory reference trajectory for the species...
Tipo: Journal Article Palavras-chave: FONCTION LYAPUNOV; STABILISATION; REPERAGE; RETROACTION DIVERGENTE; COEXISTENCE DES ESPECES FEEDBACK; CHEMOSTATS; LYAPUNOV FUNCTIONS; STABILIZATION; SYSTEMS BIOLOGY; TRACKING.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20093492d25e&uri=/notices/prodinra1/2010/12/
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Long run coexistence in the chemostat with multiple species Inra
Rapaport, A.; Dochain, D.; Harmand, J..
In this work we analyze the transient behavior of the dynamics of multiple species competing in a chemostat for a single resource, presenting slow/fast characteristics.We prove that coexistence among a subset of species, with growth functions close to each other, can last for a substantially long time. For these cases, we also show that the proportion of non-dominant species can be increasing before decreasing, under certain conditions on the initial distribution.
Tipo: Journal Article Palavras-chave: DYNAMIQUE DES POPULATIONS; COEXISTENCE DES ESPECES; SURVIE DES ESPECES; PROBABILITE SPECIES COEXISTENCE; SPECIES SURVIVAL; CHEMOSTAT; COMPETITION; PERSISTENCE; SLOW–FAST DYNAMICS.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200924e18936&uri=/notices/prodinra1/2010/12/
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Multiple stable equilibrium profiles in tubular bioreactors Inra
Dramé, A.K.; Lobry, C.; Harmand, J.; Rapaport, A.; Mazenc, F..
This paper deals with the existence and stability of multiple equilibrium profiles in tubular bioreactors. We prove here that a tubular biological reactor can posses one or several equilibrium profiles according to the dispersion and convection terms as long as the kinetic function belongs to a general class of non-monotonic functions. Such systems allow the characterization of the hydrodynamic behavior of most real systems in classifying them between completely mixed systems and perfect Plug Flow systems. The stability analysis of equilibrium profiles is also carried out and it is shown that they are alternatively stable, unstable, stable, etc.
Tipo: Journal Article Palavras-chave: BIOREACTEUR TUBULAIRE; STABILITE; PROFIL D’EQUILIBRE MULTIPLE; HYDRODYNAMIQUE; CALCUL DES VARIATIONS HYDRODYNAMIC; CALCULUS OF VARIATION; TUBULAR BIOREACTOR; CONVECTION-DISPERSION; MULTIPLE EQUILIBRIUM PROFILES; STABILITY.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2008ca7db242&uri=/notices/prodinra1/2010/12/
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Output tracking of bioprocesses through recirculation with unknown input concentration Inra
Rapaport, A.; Mazenc, F.; Harmand, J..
In a recent work, a new regulator of the output of a continuous autocatalytic bioprocess, by means of recirculation loop, has been presented. It wasshown that controlling the recirculation flow rate allows the stabilization of theoutput in presence of an uncontrolled input flow rate. In the present paper, weextend this result when the input substrate concentration is unknown. For thispurpose, we propose the design of an observer of the input concentration which,coupled with a slightly different control law reminiscent of the one used in the casewhere the input concentration is known, guarantees the regulation of the output.
Tipo: Conference Paper Palavras-chave: CONCENTRATION; DEBIT; BOUCLE DE RECIRCULATION; COMMANDE NON LINEAIRE; REGULATION DE SORTIE BIOPROCESS; RECIRCULATION LOOP; OUTPUT REGULATION; NONLINEAR CONTROL; UNKNOWN INPUT OBSERVER.
Ano: 2006 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2008a2c5ed50&uri=/notices/prodinra1/2008/02/
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Output tracking of continuous bioreactors through recirculation and by-pass Inra
Harmand, J.; Rapaport, A.; Mazenc, F..
Tipo: Journal Article Palavras-chave: PROCEDE BIOLOGIQUE; NON LINEARITE; CONTROLE CONTINU CONTINUOUS BIOREACTOR; RECIRCULATION LOOP; OUTPUT REGULATION; NONLINEAR CONTROL DESIGN.
Ano: 2006 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20075f76241b&uri=/notices/prodinra1/2008/02/
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Practical coexistence in the chemostat with arbitrarily close growth functions Inra
Rapaport, A.; Dochain, D.; Harmand, J..
Nous montrons que la coexistence entre différentes espèces en compétition sur une même ressource peut durer sensiblement, lorsque leurs courbes de croissance sont arbitrairement proches. Le comportement transitoire est analysé en termes de dynamiques lente-rapide. Nous prouvons que des espèces non dominantes peuvent d’abord croître avant de décrroître, en fonction de leurs proportions initiales.
Tipo: Journal Article Palavras-chave: COEXISTENCE DES ESPECES; SURVIE DES ESPECES; CHEMOSTAT; COMPETITION; PERSISTANCE; DYNAMIQUES LENTE-RAPIDE SPECIES COEXISTENCE; POPULATION DYNAMICS; SURVIVAL OF SPECIES; PERSISTENCE; SLOW-FAST DYNAMICS.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2009a443254d&uri=/notices/prodinra1/2010/12/
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Stabilization and Robustness Analysis for a Chemostat Model with Two Species and Monod Growth Rates via a Lyapunov Approach Inra
Mazenc, F.; Malisoff, M.; Harmand, J..
We study a two species chemostat model with one limiting substrate. We design feedback controllers so that an equilibrium with arbitrary prescribed species concentrations becomes globally asymptotically stable. The novelty of our work is that we assume that only a linear combination of the species concentrations is available for measurement, combined with our use of Lyapunov function methods to generate stable coexistence and quantify the effects of disturbances. Our closed-loop error dynamics are integral input-to-state stable with respect to small perturbations of the controllers. Hence, no matter what initial positive levels for the species concentrations and substrate are selected, the long term species and substrate levels remain close to the...
Tipo: Conference Paper Palavras-chave: COEXISTENCE DES ESPECES; RETROACTION; STABIBLITE; ETAT INCERTAIN; BIOREACTEUR; STABILISATION GLOBALE BIOREACTORS; CHEMOSTATS; GLOBAL STABILIZATION; UNCERTAIN STATES; INTEGRAL INPUT-TO-STATE STABILITY;  ; LYAPUNOV FUNCTION; FEEDBACK; SPECIES COEXISTENCE.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010f65031fd&uri=/notices/prodinra1/2011/01/
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Stabilization in a two-species chemostat with monod growth functions Inra
Mazenc, F.; Malisoff, M.; Harmand, J..
We design feedback controllers for two species chemostats so that an equilibrium with arbitrary prescribed positive species concentrations becomes globally asymptotically stable. We use a new global explicit strict Lyapunov function construction, which allows us to quantify the effects of disturbances using the input-to-state stability paradigm. We assume that only a linear combination of the species concentrations is known. We illustrate our approach using a numerical example.
Tipo: Journal Article Palavras-chave: BIOREACTEUR; ETAT INCERTAIN; CHEMOSTAT; COEXISTANCE DES ESPÈCES; FONCTION LYAPUNOV; COMPETITION  ARTIFICIAL INTELLIGENCE; LYAPUNOV FONCTION; SPECIES COEXISTENCE;  ; BIOREACTORS; INTEGRAL INPUT-TO-STATE STABILITY; UNCERTAIN STATES.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2009eb514005&uri=/notices/prodinra1/2010/12/
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Stabilization of a periodic trajectory for a chemostat with Two species Inra
Mazenc, F.; Malisoff, M.; Harmand, J..
We study a chemostat model with two organisms using Lyapunov function methods. Using a linear feedback control of the dilution rate and an appropriate time-varying substrate input concentration, we produce a locally exponentially stable oscillatory behavior for the species concentrations, meaning all trajectories of the chemostat that stay near the oscillatory reference trajectory are actually attracted to the reference trajectory exponentially fast. We also obtain a globally stable oscillatory reference trajectory for the species concentrations, using a nonlinear feedback control depending on the dilution rate and the substrate input concentration. This guarantees that all trajectories for the closed loop chemostat dynamics are attracted to the reference...
Tipo: Conference Paper Palavras-chave: MODELE CHEMOSTAT; FONCTION LYAPUNOV; CONTROLE DE RETRAOCTION NON LINEAIRE; COEXISTENCE DES ESPECES CHEMOSTAT MODEL; LYAPUNOV FUNCTION; NONLINEAR FEEDBACK CONTROL; SPECIES COEXISTENCE.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD201045177e65&uri=/notices/prodinra1/2011/01/
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The microbial signature of drinking waters: myth or reality ? Inra
Harmand, J.; Paulou, L.; Desmoutiers, J.; Garrelly, L.; Dabert, P.; Godon, J.J..
This paper presents a new software developed for analyzing single strand conformation polymorphism (SSCP) electrophoresis patterns delivered by the genetic analyzer ABI310 (Applied Biosystems). SSCP is a molecular typing technique based on the PCR amplification of microbial 16S rDNA and used for the monitoring of complex microbial ecosystems dynamics. The software – a home-made MATLAB toolbox called MODIMECO – developed for the analysis of SSCP patterns is presented. MODIMECO includes a number of basic signal processing abilities as well as largely used statistical tools such as the well known principal component analysis. The use of the SSCP for assessing the hypothesis of the existence of a microbial signature of drinking waters illustrates the typical...
Tipo: Journal Article Palavras-chave: COMMUNAUTE MICROBIENNE; EMPREINTE MOLECULAIRE MATLAB TOOLBOX; SOFTWARE; 16S rDNA SINGLE STRAND CONFORMATION POLYMORPHISM; PATTERN ANALYSIS; MICROBIAL SIGNATURE; CLASSIFICATION; PCA.
Ano: 2006 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2007537dadad&uri=/notices/prodinra1/2008/07/
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The optimal design of two interconnected (bio)chemical reactors revisited Inra
Harmand, J.; Dochain, D..
Tipo: Journal Article Palavras-chave: CONCEPTION OPTIMALE; SYSTEME BIOLOGIQUE EQUIVALENT; REACTEURS EN SERIE; REACTION CHIMIQUE OPTIMAL DESIGN; STEADY-STATE EQUIVALENT BIOLOGICAL SYSTEMS; REACTORS IN SERIES; (BIO)CHEMICAL REACTIONS; INTERCONNECTED SYSTEMS; OPTIMIZATION.
Ano: 2005 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20078ec5a1b6&uri=/notices/prodinra1/2008/01/
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Unknown input observers for biological processes Inra
Rapaport, A.; Dochain, D.; Harmand, J.; Acuna, G..
This paper addresses the question of estimating unknown inputs in biological processes. The unknown inputs are either constant or periodic (as e.g. in municipal wastewater treatment plants where the loading rate is unknown yet of a period equal to one day). In particular the designed observer is able to recover the unknown periodic inputs over a few periods.
Tipo: Conference Paper Palavras-chave: ENTREE INCONNUE; ENTREE PERIODIQUE; PROCEDE BIOLOGIQUE; TRAITEMENT DES EAUX USEES PARAMETER AND STATE ESTIMATION; WASTEWATER TREATMENT PROCESSES; UNKNOWN INPUT; PERIODIC INPUT; STATE OBSERVER; BIOLOGICAL PROCESS.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20085394192c&uri=/notices/prodinra1/2010/12/
Registros recuperados: 18
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