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Registros recuperados: 38
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A few structural and growth parameters describing corn root system Inra
Jordan, M.O.; Picard, D.; Girardin, P..
Tipo: Journal Article Palavras-chave: SYSTEME RACINAIRE; CROISSANCE RACINAIRE; RAMIFICATION ROOT SYSTEM; ROOT GROWTH; CORN; ROOT ARCHITECTURE; MODEL.
Ano: 1985 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD201128613173&uri=/notices/prodinra1/2011/06/
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A steady-state model of PCB accumulation in dab food web ArchiMer
Loizeau, Veronique; Menesguen, Alain.
A five-compartment steady-state food web model is proposed for the benthic food web leading to the dab. Three exposure pathways are considered in the description of accumulation by benthic animals: ingestion of particulate contaminants associated with either sediment or phytoplankton, and respiratory uptake of free dissolved contaminant in overlaying water. Application of the model to a simple food web in the Bay of Seine (Eastern Channel) indicates that : a) feeding is the principal route of contamination, especially for PCB which have more than four chlorine atoms in the molecule ; b) excretion and growth rates, phytoplankton lipid fraction and organic carbon content of sediment are the parameters which mostly determine the chemical bioaccumulation in...
Tipo: Text Palavras-chave: MODEL; PCB; FOOD WEB; BENTHIC INVERTEBRATES; DAB.
Ano: 1993 URL: http://archimer.ifremer.fr/doc/00100/21127/18747.pdf
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Agricultural landscape connectivity for the meadow brown butterfly (Maniola jurtina) Inra
Ouin, A.; Martin, M.; Burel, F..
The relationships between movements of the meadow brown butterfly (Maniola jurtina) and landscape features were examined at differentscales in three hedgerow network landscapes of western France. Of the 4174 and 1474 individuals marked in the three landscapes in 1998 and 1999 respectively, a total of 1057 and 285 were recaptured at least once. Partial least squares (PLS) regression was used to model the number of butterflies moving between herbaceous patches within the landscape. The model predictors were related to (i) the distance separating the patches, (ii) the characteristics of the landscape between the patches and (iii) the characteristics of the departure and arrival patches, including the number of individuals marked in each patch. Site effects...
Tipo: Journal Article Palavras-chave: CONNECTIVITY; MOVEMENT; MODEL; MANIOLA JURTINA; PARTIAL LEAST SQUARE REGRESSION; SITE EFFECT.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2009b9100cf0&uri=/notices/prodinra1/2010/09/
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An atlas of long-term currents in the channel ArchiMer
Salomon, Jean-claude; Breton, Marguerite.
The last diagram shows the magnitude of the dispersion coefficient. This enables a dilution computation to be added to the advective part of dissolved substances and microorganism movements.
Tipo: Text Palavras-chave: CHANNEL; CURRENT; MODEL; TIDE; LAGRANGE.
Ano: 1993 URL: http://archimer.ifremer.fr/doc/00099/21068/18693.pdf
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Biofilm model calibration and microbial diversity study using Monte Carlo simulations Inra
Brockmann, D.; Caylet, A.; Escudie, R.; Bernet, N.; Steyer, J.P..
A single specie biofilm model was used to describe aerobic glucose degradation at 45°C in a biofilm reactor operated at three different hydraulic retention times (HRT). The model was calibrated to experimental data using the Monte Carlo filtering method. Eleven parameter sets out of 500 properly described the biofilm reactor performance for the three HRTs studied. After calibration, the single specie biofilm model was extended to a model with 10 differentheterotrophic bacteria for studying microbial diversity in bulk phase and biofilm, as well as the competition between suspended and attached biomass. Independent of the HRT, the dominating and only remaining bacterial group in steady state was the same for bulk phase and biofilm. Thedominating bacterial...
Tipo: Conference Paper Palavras-chave: DIVERSITE MICROBIENNE BIOFILM; CALIBRATION; MICROBIAL DIVERSITY; MODEL; MONTE CARLO SIMULATION.
Ano: 2011 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2011518d16c3&uri=/notices/prodinra1/2011/07/
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Combining ecophysiological modelling and quantitative trait locus analysis to identify key elementary processes underlying tomato fruit sugar concentration Inra
Prudent, M.; Lecomte, A.; Bouchet, J.P.; Bertin, N.; Causse, M.; Génard, M..
A mechanistic model predicting the accumulation of tomato fruit sugars was developed in order (i) to dissect the relative influence of three underlying processes: assimilate supply (S), metabolic transformation of sugars into other compounds (M), and dilution by water uptake (D); and (ii) to estimate the genetic variability of S, M, and D. The latter was estimated in a population of 20 introgression lines derived from the introgression of a wild tomato species (Solanum chmielewskii) into S. lycopersicum, grown under two contrasted fruit load conditions. Low load systematically decreased D in the whole population, while S and M were targets of genotype×fruit load interactions. The sugar concentration positively correlated to S and D when the variation was...
Tipo: Journal Article Palavras-chave: CHARGE EN FRUITS; SUGAR ACCUMULATION; INTROGRESSION LINES; ASSIMILATE SUPPLY; DILUTION; FRUIT LOAD; FRUIT QUALITY; GENETIC VARIATION; METABOLISM; MODEL; STARCH ACCUMULATION SOLANUM CHMIELEWSKII.
Ano: 2011 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2011f98e9db2&uri=/notices/prodinra1/2011/05/
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Combining organic and mineral fertilizers for integrated soil fertility management in smallholder farming systems of Kenya: explorations using the crop-soil model FIELD Inra
Tittonell, P.; Corbeels, M.; van Wijk, M.T.; Vanlauwe, B.; Giller, K.E..
Integrated soil fertility management (ISFM) technologies for African smallholders should consider (i) within-farm soil heterogeneity; (ii) long-term dynamics and variability; (iii) manure quality and availability; (iv) access to fertilizers; and (v) competing uses for crop residues. We used the model FIELD (Field-scale resource Interactions, use Effi ciencies and Long term soil fertility Development) to explore allocation strategies of manure and fertilizers. Maize response to N fertilizer from 0 to 180 kg N ha–1 (±30 kg P ha–1) distinguished poorly responsive fertile (e.g., grain yields of 4.1–5.3 t ha–1 without P and of 7.5–7.5 t ha–1 with P) from responsive (1.0–4.3 t ha–1 and 2.2–6.6 t ha–1) and poorly responsive infertile fi elds (0.2–1.0 t ha–1 and...
Tipo: Journal Article Palavras-chave: FUMIER; FERTILISATION INTEGREE; REHABILITATION DES SOLS AFRICA; AGRICULTURAL LAND; CROP RESIDUES; MODEL; FERTILIZER; MANURE.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010798dcd89&uri=/notices/prodinra1/2010/03/
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Combining scientific and lay knowledge in model to accompany actors in a changing agriculture Inra
Navarrete, M.; Tchamitchian, M.; Etienne, M.; Lécrivain, E.; Lasseur, J.; Napoleone, M..
Tipo: Conference Paper Palavras-chave: SYSTEME MULTI-AGENTS FARMING SYSTEM; BIOTECHNICAL PROCESS; AGRONOMICAL APPROACH; MODEL; GRAZING MANAGEMENT; VEGETABLE CULTIVATION.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2007998a5090&uri=/notices/prodinra1/2011/01/
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Comment articuler modes d'évaluation des variétés, conduite des cultures et processus d'amélioration génétique? Inra
Jeuffroy, M.H.; Messean, A..
Le développement conjoint et cohérent, au cours des dernières décennies, d’une sélection variétale axée sur l’amélioration de la productivité et d’innovations techniques permettant de lever les facteurs limitants de la production a permis une amélioration significative et régulière de la production agricole. Face aux changements globaux, aux enjeux liés au développement durable et à la diversification des attentes des marchés et de la société, une évolution des systèmes de production est nécessaire. Compte-tenu de la cohérence des systèmes de production, et du lien entre sélection variétale et conduite de cultures, non seulement l’évaluation des variétés doit prendre en compte la diversité accrue des environnements de production et des critères...
Tipo: Journal Article Palavras-chave: CONDUITE CULTURALE; INTERACTION GENOTYPE-ENVIRONNEMENT CULTIVAR; CROP MANAGEMENT; MODEL; GENOTYPE BY ENVIRONMENT INTERACTION; CROPPING SYSTEMS.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2011bf8af484&uri=/notices/prodinra1/2011/04/
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De Carlos Menem a Fernando De La Rúa : del liderazgo a la crisis institucional (Tema Central) Buscador Latinoamericano
Leiras, Santiago C..
La crisis institucional que vive la democracia argentina tiene su expresión bajo dos esferas de análisis de los procesos democráticos: la dimensión horizontal, dada por el déficit en el control institucional y la división y funcionamiento independiente de los poderes; y la dimensión vertical, fundamentalmente vinculada a la crisis de legitimidad política, traducible en crecientes grados de apatía electoral - a través de la abstención política o la anulación del sufragio - y en el rechazo explícito de la ciudadanía hacia sus representantes institucionales.
Tipo: Artículo Palavras-chave: CRISIS; DEMOCRACIA; POLÍTICA; ELECCIONES; MODELO; ESTADO; LIDERAZGO; INSTITUCIONALIDAD; REFORMA; CRISIS; DEMOCRACY; POLITIC; ELECTIONS; MODEL; STATE; LEADERSHIP; INSTITUTIONAL; REFORM; ARGENTINA.
Ano: 2002 URL: http://hdl.handle.net/10469/4537
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De Carlos Menem a Fernando De La Rúa : del liderazgo a la crisis institucional (Tema Central) Buscador Latinoamericano
Leiras, Santiago C..
La crisis institucional que vive la democracia argentina tiene su expresión bajo dos esferas de análisis de los procesos democráticos: la dimensión horizontal, dada por el déficit en el control institucional y la división y funcionamiento independiente de los poderes; y la dimensión vertical, fundamentalmente vinculada a la crisis de legitimidad política, traducible en crecientes grados de apatía electoral - a través de la abstención política o la anulación del sufragio - y en el rechazo explícito de la ciudadanía hacia sus representantes institucionales.
Tipo: Artículo Palavras-chave: CRISIS; DEMOCRACIA; POLÍTICA; ELECCIONES; MODELO; ESTADO; LIDERAZGO; INSTITUCIONALIDAD; REFORMA; CRISIS; DEMOCRACY; POLITIC; ELECTIONS; MODEL; STATE; LEADERSHIP; INSTITUTIONAL; REFORM; ARGENTINA.
Ano: 2002 URL: http://hdl.handle.net/10469/4537
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Denitrification potential and rates of complex carbon source from dairy effluents in activated sludge system Inra
Sage, M.; Daufin, G.; Gesan-Guiziou, G..
A predictive model for the denitrification performance of complex carbon sources was proposed based on compositional data. Potential and rates of denitrification of single dairy components (lactose, lactate, proteins, fat), as well as binary and complex (modelled ‘‘process water’’) mixtures were assessed using test for nitrogen uptake rate (NUR). In all experiments, denitrification potential of mixtures was found to be significantly higher than the sum of individual potentials and denitrification rate with the readily biodegradable moiety of the mixtures was similar to the highest rate obtained with individual components (lactose or lactate). This work shows that activated sludge acclimated to dairy components can be modelled as a single biomass where the...
Tipo: Journal Article Palavras-chave: BOUE ACTIVEE; EPURATION BIOLOGIQUE DENITRIFICATION; DAIRY EFFLUENT; ACTIVATED SLUDGE; CARBON SOURCE; MODEL.
Ano: 2006 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20072d63bce4&uri=/notices/prodinra1/2008/02/
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Design of intercrop management plans to fulfil production and environmental objectives in vineyards Inra
Ripoche, A.; Celette, F.; Cinna, J.P.; Gary, C..
Designing intercrop management plans (IMP) to meet objectives related to both crop production and environmental impacts is a challenge for farmers. A multiple criteria decision analysis is thus needed to evaluate and rate various cropping systems in different soil and climate conditions. Different intercrop management plans in vineyards were analysed in this study so as to classify them in relation to their ability to fulfil a particular set of objectives and to deal with climatic variability.The method included five steps. A set of intercrop management plans was defined by combining the type of grass, the covered soil surface ratio, and the intercropping duration. Four evaluation criteria were chosen: grapevine vegetative development, yield, product...
Tipo: Journal Article Palavras-chave: CULTURE INTERCALAIRE; CULTURE PERENNE; SERIE CLIMATIQUE; ROBUSTESSE DU MODELE WATER BALANCE; MODEL; MULTIPLE CRITERIA DECISION ANALYSIS; INTERCROPPING; PERENNIAL CROP.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010e0b33e7d&uri=/notices/prodinra1/2010/08/
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Dispersal strategies of phytophagous insects at a local scale: adaptive potential of aphids in an agricultural environment Inra
Lombaert, E.; Boll, R.; Lapchin, L..
Background: The spread of agriculture greatly modified the selective pressures exerted by plants on phytophagous insects, by providing these insects with a high-level resource, structured in time and space. The life history, behavioural and physiological traits of some insect species may have evolved in response to these changes, allowing them to crowd on crops and to become agricultural pests. Dispersal, which is one of these traits, is a key concept in evolutionary biology but has been over-simplified in most theoretical studies. We evaluated the impact of the local-scale dispersal strategy of phytophagous insects on their fitness, using an individual-based model to simulate population dynamics and dispersal between leaves and plants, by walking and...
Tipo: Journal Article Palavras-chave: APHIDS; PHYTOPHAGOUS; POPULATION DYNAMICS; DISPERSAL STRATEGY; MODEL; PLANT CHARACTERISTICS; EVOLUTION.
Ano: 2006 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2007b56bf41e&uri=/notices/prodinra1/2009/10/
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Does reaction-diffusion support the duality of fragmentation effect? Inra
Roques, L.; Chekroun, M.D..
There is a gap between single-species model predictions, and empirical studies, regarding the effect of habitat fragmentation per se, i.e., a process involving the breaking apart of habitat without loss of habitat. Empirical works indicate that fragmentation can have positive as well as negative effects, whereas, traditionally, single-species models predict a negative effect of fragmentation. Within the class of reaction-diffusion models, studies almost unanimously predict such a detrimental effect. In this paper, considering a single-species reaction-diffusion model with a removal -- or similarly harvesting -- term, in two dimensions, we find both positive and negative effects of fragmentation of the reserves, i.e. the protected regions where no removal...
Tipo: Journal Article Palavras-chave: MODELISATION; MODELE MATHEMATIQUE; HABITAT; RECOLTE; MODELE SPATIAL; REACTION-DIFFUSION; BIOLOGIE DE LA CONSERVATION; DENSITE DE POPULATION FRAGMENTATION; SINGLE-SPECIES MODEL; HARVESTING; SPATIAL PATTERNS; CONSERVATION BIOLOGY; MODEL.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20096947ae43&uri=/notices/prodinra1/2010/02/
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Effect of cropping systems on species dynamics and gene flow at the landscape level. A modelling approach Inra
Colbach, N..
Tipo: Conference Paper Palavras-chave: CROPPING SYSTEM; GENE FLOW; GMO; LANDSCAPE; MODEL; POPULATION DYNAMICS.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200868dc4e79&uri=/notices/prodinra1/2011/06/
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Expansion of pine processionary moth in Europe: patterns and predictive model Inra
Robinet, C.; Roques, A.; Rousselet, J.; Battisti, A..
Tipo: Meeting Paper Palavras-chave: THAUMETOPOEA PITYOCAMPA; PROCESSIONNAIRE DU PIN; EXPANSION; DISPERSION; DEVELOPPEMENT LARVAIRE; RECHAUFFEMENT CLIMATIQUE PINE PROCESSIONARY ; PEST INSECT; MODEL; CLIMATE CHANGE; WARMING CLIMATE; LARVAL DEVELOPMENT; DISPERSAL; SPATIAL DISTRIBUTION.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2009f9b4a78c&uri=/notices/prodinra1/2010/07/
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Integrated analysis of the extension of organic agriculture in the Camargue: a participatory approach for model-based indicators at different scales Inra
Delmotte, S.; Lopez Ridaura, S.; Barbier, J.M.; Wery, J..
The development of organic farming is nowadays seen as a possible solution to meet the different objectives of sustainable development. In the Camargue, South of France, environmental issues are strongly linked with agriculture, and stakeholders are in need of integrated approaches to analyse the plausible impacts of alternative farming systems at multiple scales, particularly at regional scale. Evaluating alternative farming systems at multiple scales requires the quantification of different indicators meaningful for different actors in support of the negotiation and decision making process. With this challenge in mind, we developed a framework for Prospective, Integrated, Multiscale and Participative Assessment of Agricultural Systems (PIMPAAS),...
Tipo: Conference Paper Palavras-chave: ANALYSE PROSPECTIVE; EVALUATION PARTICIPATIVE; EVALUATION MULTIECHELLE; EVALUATION INTEGREE PROSPECTIVE EVALUATION; INTEGRATED EVALUATION; MULTISCALE EVALUATION; PARTICPATORY EVALUATION; SCENARIO EVALUATION; AGRO-ECOSYSTEM EVALUATION; MODEL.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20101d3faca8&uri=/notices/prodinra1/2011/02/
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Model-assisted analysis of tomato fruit growth in relation to carbon and water fluxes Inra
Liu, H.F.; Génard, M.; Guichard, S.; Bertin, N..
This work proposed a model of tomato growth adapted from the Fishman and Genard model developed to predict carbon and water accumulation in peach fruit. The main adaptations relied on the literature on tomato and mainly concerned: (i) the decrease in cell wall extensibility coefficient during fruit development; (ii) the increase in the membrane reflection coefficient to solute from 0 to 1, which accounted for the switch from symplasmic to apoplasmic phloem unloading, and (iii) the negative influence of the initial fruit weight on the maximum rate of active carbon uptake based on the assumption of higher competition for carbon among cells in large fruits containing more cells. A sensitivity analysis was performed and the model was calibrated and evaluated...
Tipo: Journal Article Palavras-chave: FLUX DE CARBONE; FLUX D'EAU; CROISSANCE DU FRUIT; CROISSANCE CELLULAIRE CARBON FLUX; CELL EXPANSION; FRUIT GROWTH; HUMIDITY; TOMATO; MODEL; WATER FLUX.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20084abe2ae1&uri=/notices/prodinra1/2009/11/
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Modeling of heat transfer in tanks during wine-making fermentation Inra
Colombie, S.; Malherbe, S.; Sablayrolles, J.M..
Temperature is one of the main factors that affect the fermentation kinetics during wine-making. We developed a thermal model to evaluate the power required to control this temperature. The model includes the changes in physio-chemical properties of the must during fermentation and the refrigeration losses to ambient from the other surface of the tank. The results were discussed considering the impact of variables such as the air speed and the air temperature. We finally validated the thermal model at the pilot scale
Tipo: Journal Article Palavras-chave: HEAT-TRANSFER; MODEL; WINE-MAKING FERMENTATION.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2008f277f068&uri=/notices/prodinra1/2009/02/
Registros recuperados: 38
Primeira ... 12 ... Última
 

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