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Artykuły w czasopismach na temat "Tritium – Environnement"
Dusabenyagasani, M., R. C. Hamelin, J. Collin i D. Dostaler. "Importance de l’intéraction entre les cultivars de blé et les souches du Fusarium graminearum dans l’évaluation de la résistance à la fusariose de l’épi". Phytoprotection 78, nr 2 (12.04.2005): 53–60. http://dx.doi.org/10.7202/706119ar.
Pełny tekst źródłaRozprawy doktorskie na temat "Tritium – Environnement"
Le, Goff Pierre. "Le tritium de l'écosystème à l'homme : Etude des mécanismes et des constantes qui régissent les équilibres et les différentes voies de transfert". Thesis, Besançon, 2013. http://www.theses.fr/2013BESA2026/document.
Pełny tekst źródłaTritium is the radioactive isotope of hydrogen. It can be integrated in most of the biological molecules.Even if its radiotoxicity is weak, effects of tritium could be increased if it can concentrate in somecritical compartments of beings. In order to better understand the tritium circulation in the environment and highlight constants of transfer between compartments, we have studied the tritiationof different agricultural matrices chronically exposed to tritium. The first step of our study is thevalidation of the different techniques used to prepare our sample. We have also demonstrated that itwas possible to store environmental samples in the Valduc centre and have underlined some biasesdue to the extraction of free water. Some ways of improvements are proposed. A hypothesis has alsobeen formulated on the origin of an original isotopic fractionation effect during the extraction of the free water of milk. In the environmental study, the specific activities measured on plants confirm the importance of the atmospheric exposure on their tritiation. No difference in the tritiation has beenmeasured between wheat, barley and colza. Some differences have been measured in the tritiation ofsome organic components of vegetal matrices. These results underline the interest of continuing thiskind of study. We have also compared the tritiation of the main hydrogenated components of milk,first, component to component, then, sample to sample. Some origins of the measured differences havebeen shown. We have demonstrated the correlation between the specific activities of drinking waterand the free water of milk as between the tritiations of dry matter of cattle’s food and of the mainorganic components of milk. Our results show also the importance of the metabolism on thedistribution of tritium in the different compartments. The overall synthesis of our results show the importance of the dilution of hydrogen in the considered environmental compartments, above theisotopic effects, even in a food chain chronically exposed to tritium
Le, Goff Pierre. "Le tritium de l'Ecosystème à l'Homme - Etude des mécanismes et des constantes qui régissent les équilibres et différentes voies de transfert". Phd thesis, Université de Franche-Comté, 2013. http://tel.archives-ouvertes.fr/tel-01061845.
Pełny tekst źródłaBacchetta, Audrey. "Analyse et spéciation du tritium dans des matrices environnementales". Electronic Thesis or Diss., Paris 6, 2014. http://www.theses.fr/2014PA066026.
Pełny tekst źródłaThis study deals with environmental monitoring. The main aims are (i) the optimisation of the analytical procedure for the tritium in organic form determination, and (ii) the identification of the tritium bearing molecules which are responsible for its transfer from the environment to man. The study was divided into three stages. First an analytical method was developed to determine hydrogen content of several samples, which is a key element to calculate accurate organically bound tritium activities. Secondly, the impact of the organically bound tritium fractions separation (labile exchange) for the determination of the representative fraction of the level of environmental tritium activity was then evaluated. For that, the amount of solubilised sample was estimated. Finally, the speciation of tritium in environmental samples was investigated. Several molecules classes and organic compounds dissolved in the labile exchanges solvent were identified. The results show that the distribution of tritium in organisms depends on both properties of the chemical bond in which it is involved and chemical properties of tritium bearing molecules. The identified compounds belong to the molecules classes such as carbohydrates or amino acids, constitutive of living organisms. It would now be of interest to study the tritium distribution in an environmental sample to target molecules of interest and study the impact of tritium from the environment to man
Ly, Delphine. "Prédictions génomiques des interactions Génotype x Environnement à l'aide d'indicateurs agro-climatiques chez le blé tendre (Triticum aestivum L.)". Thesis, Clermont-Ferrand 2, 2016. http://www.theses.fr/2016CLF22669/document.
Pełny tekst źródłaIn a climate change context, assuring high and stable yield in more sustainable agricultural systems is a major challenge for plant breeding. We are aiming for future wheat varieties which will be heat and drought tolerant, and also productive in limited fertilization input environments. New prediction methods of the response to these stresses are needed to move forward. In this study, we first identified stresses that generated interactions between genotypes and environments (GxE) in our experimental trials and then developed a genomic model for adaptation to a particular environmental stress (Factorial Regression genomic Best Linear Unbiased Prediction ou FR-gBLUP), in our case drought. This model hypothesizes that the more individuals are genetically close, the more their response to a stress will resemble. We used cross-validations to measure prediction accuracy gains compared to an additive model and observed gains between 3.5% and 15.4%. Besides, simulation studies showed that the more the variance explained by the responses to the stress is important, the more the FR-gBLUP model will improve the additive model. Furthermore, fine characterization of the stresses limiting the plants’ growth is required to predict varietal responses to a particular stress. We focused on the particular case of nitrogen stress in France. By establishing crop model based stress indicators and comparing them to classical indicators, such as the management system or the available nitrogen, we pointed out the interest of crop model to characterize GxE interactions and to predict the genomic response to nitrogen stress, as long as the GxE interaction signal is strong enough. Beyond the potential applications of these methods for breeding or recommendation for varieties more adapted or tolerant to environmental stresses, this study also raises the interest of coupling eco-physiological and genetics approaches
Casagrande, Marion. "Evaluation précoce des performances du blé biologique (rendement et teneur en protéines) : une approche combinée de diagnostic agronomique, de modélisation à l'aide d'indicateurs de nuisibilité et d'études des pratiques dans les exploitations agricoles". Phd thesis, AgroParisTech, 2008. http://pastel.archives-ouvertes.fr/pastel-00004736.
Pełny tekst źródłaLacaze, Xavier. "Interprétation des interactions génotype x environnement et étude des Déterminants génétiques de l'adaptation : exemple de la teneur en protéines du grain de blé dur (Triticum turgidum)". École nationale supérieure agronomique (Montpellier), 2005. http://www.theses.fr/2005ENSA0019.
Pełny tekst źródłaRety, Céline. "Toxicité et mode d’action du tritium seul et en mélange avec du cuivre sur l’algue verte Chlamydomonas reinhardtii". Thesis, Montpellier 1, 2010. http://www.theses.fr/2010MON13504.
Pełny tekst źródłaLiquid releases by Nuclear Power Plants (NPP) are composed of a mixture of radioactive and non-radioactive substances. When organisms are exposed to mixtures of contaminants the resultant toxicity can be enhanced, or reduced, due to interactions. In order to identify potential interactions between substances released by NPP, two substances representative of such effluents (in term of toxicity and of quantity) were selected for studies: Tritiated water (HTO) and copper (Cu). Effects of this binary mixture were studied on the unicellular green algae Chlamydomonas reinhardtii. HTO, when examined along, was not very toxic to C. reinhardtii. The most sensitive and early effect of HTO was an increase in oxidative stress at concentrations of 40 kBq mL-1 (0.13 µGy h-1). Algae exposure to the binary mixture HTO/Cu induced interactive effects on oxidative stress. Reactive Oxygen Species production was higher from exposure to the mixture of contaminants than the addition of the effect from each substance individually. This interaction was explained by an enhanced copper uptake by the alge when in the presence of HTO. The observed supra-additive effect could also be due to direct toxic interactions, especially on the antioxidant system. To conclude, this study showed that the effects of a mixture of radioactive and non-radioactive substances can be greater than what would be predicted based on mere addition of individual effects. Even thought this binary mixture is just a small part of NPP effluents, the study showed that potential interactions should be considered when determining ecological risks too aquatic ecosystems from NPP effluents
Guérin, Dachkevitch Nathalie. "Emissions de N2 O par les sols cultivés : effets de la teneur en nitrate et de la température". Dijon, 1999. http://www.theses.fr/1999DIJOS081.
Pełny tekst źródłaBouffier, Bruno. "Genetic and ecophysiological dissection of tolerance to drought and heat stress in bread wheat : from environmental characterization to QTL detection". Thesis, Clermont-Ferrand 2, 2014. http://www.theses.fr/2014CLF22532/document.
Pełny tekst źródłaA stagnation of wheat yield was reported in France and other countries worldwide since the 1990’s, which incriminated mainly drought and heat stress. Improving the European wheat tolerance to them is of first importance. This study aimed to investigate the genetic determinism of the tolerance to such stresses. Three CIMMYT bread wheat populations combining complementary heat and drought adaptive habits were grown in Northern Mexico under irrigated, drought and heat-irrigated treatments from 2011 to 2013. The trial network comprised 15 trials and both physiological and agronomic traits were scored. First, an environmental characterization methodology was developed and resulted in the identification of six main environmental scenarios in the network. A representative environmental covariate was extracted from each of them. Then, a factorial regression model leaded to the dissection of the genotype-by-environment interaction and highlighted differential stress sensitivity of the germplasm. Finally, a multi-environmental QTL detection resulted in the discovery of genomic regions involved in the control of both physiological and agronomic traits and the study of their sensitivity to the environment. From the environmental characterization to the QTL detection, this study resulted in the development of a tool for breeders which may enable the evaluation of the potential of any genotypes in front of a range of environment, but also the identification of genomic regions involved in the control of the tolerance to drought and heat stress in bread wheat. This may help in improving the tolerance of the European bread wheat germplasm to drought and heat stress
Gigot, Christophe. "Potentialités des associations de variétés pour limiter la progression épidémique de la septoriose du blé : rôle des mécanismes de dispersion des spores par la pluie dans un couvert végétal hétérogène". Phd thesis, AgroParisTech, 2013. http://pastel.archives-ouvertes.fr/pastel-00961537.
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