Letteratura scientifica selezionata sul tema "Séparation moléculaire"
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Articoli di riviste sul tema "Séparation moléculaire":
RIQUET, J., e F. PITEL. "Les techniques de base de la génétique moléculaire". INRAE Productions Animales 13, HS (23 dicembre 2000): 29–35. http://dx.doi.org/10.20870/productions-animales.2000.13.hs.3808.
Ledoux, Virginie, Laurent Dulau e Denis Dubourdieu. "Interprétation de l'amélioration de la stabilité protéique des vins au cours de l'élevage sur lies". OENO One 26, n. 4 (31 dicembre 1992): 239. http://dx.doi.org/10.20870/oeno-one.1992.26.4.1188.
Le Coupannec, F., e J. J. Peron. "Fractionnement et caractérisation des lixiviats de centres d'enfouissement technique de déchets ménagers: intérêt de la chromatographie liquide haute performance sur le gel d'exclusion stérique". Revue des sciences de l'eau 12, n. 3 (12 aprile 2005): 529–43. http://dx.doi.org/10.7202/705364ar.
Rotimi, E. A., A. M. Aliyu e A. Aruwayo. "Morphological characteristics of goat breeds in Nigeria using discriminant analysis approach". Nigerian Journal of Animal Production 48, n. 5 (10 novembre 2021): 30–40. http://dx.doi.org/10.51791/njap.v48i5.3185.
NYS, Y. "Préface". INRAE Productions Animales 23, n. 2 (10 aprile 2011): 107–10. http://dx.doi.org/10.20870/productions-animales.2010.23.2.3292.
CASSAM-CHENAÏ, Patrick. "Séparation et contraction de variables en spectroscopie moléculaire - La méthode ICCE". Mathématiques, aprile 2014. http://dx.doi.org/10.51257/a-v1-af110.
Tesi sul tema "Séparation moléculaire":
Moreno, Martinez Diego. "Etude par dynamique moléculaire de la séparation de l'uranium (VI) sur support solide". Electronic Thesis or Diss., Montpellier, Ecole nationale supérieure de chimie, 2022. http://www.theses.fr/2022ENCM0018.
The uranium extraction plays an essential role in the nuclear fuel cycle. The extraction using mesoporous silica solid supports represents a promising alternative to the liquid-liquid extraction processes. In fact, the compactness of these solid supports, the facility of implementation associated to the reduction of organic effluents give to this system great competitive advantage. This kind of systems has already been studied experimentally within the framework of two PhD students in the CEA (Atomic Energy Commission). Thus, the objective of this research, centered on theoretical chemistry studies (especially by molecular dynamics), is to rationalize the behaviors that have been experimentally observed and to provide comprehension elements about the involved mechanisms. In order to do this, the uranium (VI) coordination at the interface within the solid phase and the aqueous phase, the influence of diverse structural parameters of the solid support, and the chemical conditions of the uranium speciation will be studied
Piras, Patrick. "Développement et exploitation d'une base de données moléculaire pour la séparation d'énantiomères par chromatographie liquide". Aix-Marseille 3, 1994. http://www.theses.fr/1994AIX30097.
Boudard, Sébastien. "Séparation de phases contrôlée dans des couches phospholipidiques supportées : vers des empreintes moléculaires". Strasbourg 1, 2007. http://www.theses.fr/2007STR13137.
The aim of this work was to investigate if supported lipid bilayers can be used as two-dimensional matrices for large templates (proteins, DNA, etc. ). This idea requires a liquid bilayer composed of at least two compounds to allow a phase separation in contact with a suitable template. The composition and the physicochemical properties permit to control the combinatorial recognition of the template and the freezing of the imprints by temperature. The features of the lipid supports assure the reversibility of the imprinting process based on the transition of a lipid mixture from the fluid state to the gel state and vice versa. We have carried out detailed physicochemical characterisations of several such systems with a phase transition temperature close to the ambient. This has led to new conclusions concerning the mechanism of bilayer formation. In addition we have demonstrated that the mobility of the lipids strongly depends on the lateral pressure of the upper leaflet of the bilayer, confirming existing hypothesis. We have also been able to demonstrate by various techniques (QCM-D, fluorescence microscopy and AFM) that the adsorbing template leads to a 2D-phase separation (patterning). However this remains a difficulty to prove that this structuration leads to reversible recognition events. The present work has been successful in narrowing down considerably the parameter space for future experiments. Thus, the validation of our approach will require the optimization of the lipid system and the use of new investigation techniques
Bahhitti, Meryem. "Extraction, séparation et identification des principes tinctoriaux du pastel (Isatis Tinctoria L. )". Toulouse, INPT, 1997. http://www.theses.fr/1997INPT009G.
Morel, Lydie. "Vulnérabilité à la dépendance : étude comportementale, biochimique et moléculaire du modèle de séparation maternelle chez le rat". Paris 5, 2009. http://www.theses.fr/2009PA05P629.
Neurobiological characteristics of an individual depend, on one hand on its genes and on the other one on his environment. Consequently, environmental factors (chronic stress, psychoactives substances) can produce long term effects on the neurophysiology and hence on neuropathologies such as depression or addiction. In order to analyze molecular mechanisms leading to vulnerability to drug dependence we have used a maternal deprivation model. In this model, maternal deprivation results into i) an increased sensitivity to morphine reward and ii) a decreased expression of preproenkephaline (PPE) mRNA and the peptid Met-enkephalin in striatum. In this model we investigated the consequences of cannabis exposure during adolescence on the vulnerability to opiates dependence in adults rats. THC treatment of young rats suppressed the hypersensitivity of mother deprived (D) rats whereas it sensitized non deprived animals (AFR). These behavioral modifications are paralleled respectively by an increase or a decrease of PPE mRNA levels in he striatum of D rats. Then, a lentiviral vector was designed for exogenous modulation of PPE expression in the rat striatum. This tool, will be used to enhance PPE expression and Met-enkephalin in D rats and observe the behavioral consequences on opiate dependence. Then, we tried to identify the mechanisms involved in long term regulation of PPE expression after maternal deprivation. We focused on epigenetic modifications of its promotor. We observed an hypermethylation and MeCP2 binding on the promotor region of PPE. These results suggest that epigenetic regulation occur after maternal deprivation. Thus providing possible therapeutic target for vulnerability to drug dependence
Palaprat, Guillaume. "Polysiloxanes mésomorphes à empreinte moléculaire chirale : synthèse des squelettes et des substituants : application à la séparation d'énantiomères". Paris 6, 2006. http://www.theses.fr/2006PA066074.
Dong, Chen. "Modification de systèmes époxy avec des élastomères solubles et réactifs : Étude de la séparation de phase induite par la réaction chimique". Lyon, INSA, 1992. http://www.theses.fr/1992ISAL0051.
The reaction induced phase separation in an epoxy s ystem modified by a soluble and reactive rubber was observed i n-situ with several methods. By light scattering and light transmission, the formation of microsize particulate morphology keeps unchanged there after. By SAXS, the beginning of phase separation was detected much earlier than the cloud point After the particulate morphology formation, further phase separation takes place only inside the formed particules resulting in a heterooeneous sturcture. Development of such a strcture can be followed by SAKX and observed by TEM in the final materials. A theoretical model based on Flory-Huggings equation was used to scheme the phase separation process. Influences of the molecular weight and en groups of rubber on the miscibility, the phase separation, the particulate morphology and the sub-particle structure were examined
Nedez, Christophe. "Chimie organométallique de surface de l'étain, du germanium et du zirconium : application à la séparation moléculaire sur zéolithes". Lyon 1, 1992. http://www.theses.fr/1992LYO10197.
Pandiyan, Sudharsan. "Modélisation moléculaire de la perméabilité du CO2 dans les membranes polymères". Chambéry, 2009. http://www.theses.fr/2009CHAMS045.
Carbon dioxide (CO2) separation studies have become a major interest for researchers in the 21st century. In the case of polymer matrices, it is important to examine the relationships between the permeation properties of CO2 and the structural and dynamical features of the polymers. We have selected three fluorinated polyimides (6FDA-6FpDA, 6FDA-6FmDA and 6FDA-DAM) and used molecular dynamics (MD) simulations to provide a detailed picture of their CO2 permeation properties at the molecular level. Atomistic models of the three fluorinated polyimides were generated using the well-established hybrid Pivot Monte Carlo (PMC)-MD single-chain sampling technique, and were subsequently simulated using MD on its own. All the models were found to compare well with experimentally-derived properties such as densities, fractional free volumes, d-spacing parameters, solubility parameters, energies and X-ray data. Structures and void-space distributions in the pure matrices were also analysed. A realistic stepwise addition of CO2 was carried out in the pure polymer matrices and an iterative procedure was used to calculate the CO2 model sorption isotherms. In addition, the volume swelling induced by CO2 sorption and the immediate effect of exposure to high concentrations of CO2 on the desorption isotherms were also studied. The void spaces, potential energies and the formation of CO2 clusters were characterized and compared with experimental characterizations. The diffusivity of CO2 as a function of CO2 concentration within the polymer matrices was analysed, and the factors affecting mobility were reported in detail
Vigneau, Olivier. "Synthèse et évaluation de polymères imprimés pour la séparation d'éléments f : application en chromatographie liquide". Lyon 1, 2002. http://www.theses.fr/2002LYO10012.