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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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How to model marine reserves? Inra
Loisel, P.; Cartigny, P..
The safeguarding of resources is one of the principal subjects of halieutics studies. Among the solutions proposed to avert the disappearance of species, the setting in place of preservation (no take) reserves is often mentioned. Most work on this subject, theoretical as well as applied, was undertaken in recent years. In this paper, we seek to compare two different models presented in existing literature by highlighting their underlying assumptions. Both models were derived from what is often referred to as the “model of Schaefer–Clark” (reference to the work of the last author on Mathematical Bioeconomics: Clark [C.W. Clark, Mathematical Bioecomics: The Optimal Management of Renewable Resources, 2nd ed., John Wiley and Sons, New-York, 1990]). We show...
Tipo: Journal Article Palavras-chave: SYSTEME DYNAMIQUE; VARIATION DE CALCUL; HORIZON INFINIE; RESERVE MARINE; MODELE BIOECONOMIQUE; RESSOURCE HALIEUTIQUE; CALCUL DES VARIATIONS; BIODIVERSITE MARINE HALIEUTICS RESOURCES; DYNAMICAL SYSTEM; CALCULUS OF VARIATION; INFINITE HORIZON; MARINE RESERVE; BIOECONOMIC MODEL.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20094013dca2&uri=/notices/prodinra1/2010/12/
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Incitation salariale et groupement d'employeurs Inra
Elyakime, B.; Loisel, P..
Tipo: Meeting Paper Palavras-chave: GROUPEMENT D'EMPLOYEURS ; INCITATION SALARIALE; SCIENCE ECONOMIQUE ; CONTRAT INCITATIF.
Ano: 2006 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200925bd0560&uri=/notices/prodinra1/2011/02/
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Methodes mathematiques pour l'etude des genes controlant des caracteres quantitatifs Inra
Goffinet, B.; Beckmann, J.; Boichard, D.; Causse, M.; Charcosset, A.; Chevalet, C.; Christophe, C.; Colleau, J.J.; Demenais, F.; Durel, C.E.; Elsen, J.M.; Foulley, J.L.; Gallais, A.; Gotz, K.U.; Hospital, H.; Kremer, A.; Lorieux, M.; Lefort-Buson, M.; Le Roy, P.; Loisel, P.; Mangin, B.; Maurice, A.; Perrier, X.; Pons, O.; Rebaï, A.; Rodolphe, F.; San Cristobal, M.; Vu Tien Khang, J..
Nous présentons ici les travaux s’inscrivant dans le cadre du projet «Mathématiques et marqueurs moléculaires», en abrégé «MMM». Ces travaux ont pour objet l’identification et l’utilisation de gènes contrôlant des caractères quantitatifs - ou QTL (quantitative trait loci) - à partir de l’information issue des phénotypes, de la généalogie et de marqueurs moléculaires. Une première partie concerne la mise en évidence de gènes à effet majeur et l’utilisation de ces gènes en sélection, à partir d’informations phénotypiques (mesures sur le caractère dont le contrôle génétique est recherché) et généalogiques (relations de parenté entre individus de la population mesurée). La deuxième partie concerne l’utilisation conjointe de ces informations...
Tipo: Journal Article Palavras-chave: MAXIMUM DE VRAISEMBLANCE; CARACTERE QUANTITATIF; SELECTION DIRIGEE; AMELIORATION DES PLANTES; CARTE GENETIQUE.
Ano: 1994 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB9400023110039598&uri=/notices/prodinra1/2007/11/
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Prédiction du comportement des solutions d’un modèle de type Fagacée Inra
Loisel, P.; Cartigny, P.; Dhote, J.F..
Tipo: Meeting Paper Palavras-chave: FAGACEA.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010dc8ed23e&uri=/notices/prodinra1/2010/12/
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Probability distribution of haplotype frequencies under the two-locus Wright-Fisher model by diffusion approximation Inra
Boitard, S.; Loisel, P..
The probability distribution of haplotype frequencies in a population, and the way it is influenced by genetical forces such as recombination, selection, random drift y is a question of fundamental interest in population genetics. For large populations, the distribution of haplotype frequencies for two linked loci under the classical Wright–Fisher model is almost impossible to compute because of numerical reasons. However the Wright–Fisher process can in such cases be approximated by a diffusion process and the transition density can then be deduced from the Kolmogorov equations. As no exact solution has been found for these equations, we developed a numerical method based on finite differences to solve them. It applies to transient states and models...
Tipo: Journal Article Palavras-chave: POPULATION GENETICS; PROBABILITE; METHODE MONTE CARLO; METHODE DES DIFFERENCES FINIES WRIGHT–FISHER MODEL; DIFFUSION PROCESSES; KOLMOGOROV FORWARD EQUATION; FINITE DIFFERENCE SCHEME.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010e741cfd3&uri=/notices/prodinra1/2011/01/
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Vigilance and its complex synchrony in the red-necked pademelon, Thylogale thetis Inra
Pays, O.; Dubot, A.L.; Jarman, P.J.; Loisel, P.; Goldizen, A.W..
Several adaptive functions, including gaining information from other group members and detecting predators, are generally ascribed to vigilance in groups of animals subject to predation. Most studies of the effects of neighbors on vigilance have focused on individual vigilance. We investigated the effects of neighbors on vigilance in wild red-necked pademelons Thylogale thetis foraging at night in nonpersistent aggregations in a clearing in rain forest. Neither the total number of pademelons in the clearing nor the numbers at various distances around focal individuals affected the individual vigilance of focal animals. However, focal animals’ individual vigilance did change with the distance to their nearest neighbor and also with distance to cover. Pairs...
Tipo: Journal Article Palavras-chave: LUTTE CONTRE LES PREDATEURS; PREDATION; COEXISTENCE DES ESPECES; SURVIE DES ESPECES RED-NECKED PADEMELON; SURVIVAL ESTIMATION; ANIMAL BEHAVIOR; PREDATOR CONTROL; ANTIPREDATOR BEHAVIOR; INDEPENDENT SCANNING; NEIGHBOR EFFECT; SYNCHRONIZATION OF VIGILANCE; VIGILANCE.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2008ff4a450f&uri=/notices/prodinra1/2010/12/
Registros recuperados: 7
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