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Дисертації з теми "Cristallisation membranaire"
Michaud, Maïté. "Contacteur membranaire innovant pour la cristallisation : application aux systèmes de type diffusion / réaction." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSE1322.
Повний текст джерелаMembrane processes are considered as one of the most promising breakthrough technology for crystallization/precipitation operations. Porous materials have been extensively investigated but they have shown some serious limitations due to pore blocking and wetting phenomenon. The use of a dense membrane is expected to circumvent the pore blocking issue while keeping the advantages of membrane processes. In a first part, the model compound, BaCO3, is precipitated within a gas-liquid or liquid-liquid membrane contactor working under static conditions for both systems. In this configuration, hydrodynamic influences are avoided. The membrane-crystals interactions are studied using several dense membrane polymers. Permeability of both reactant species and surface tension are the key parameters to be considered. Indeed, these parameters greatly affect the deposit location of the crystals and their adherence on the membrane surface. Fouling within the membrane and on the surface are prevented with PDMS and Teflon AF 2400 which are thereby the two most promising materials for the given application. In a second part, the same model compound is precipitated in gas-liquid system under dynamic conditions. Self-supporting (PDMS) and composite hollow fibers (PP-Teflon AF 2400) are studied. Investigations on the operating condition influences show similar results to those obtained with membrane contactor used for CO2 capture: resistance to mass transfer is mainly located in the liquid phase. Proof of concept is supported by the stable performances obtained with the PP-Teflon AF 2400 module of 10 % packing ratio. The module geometry, and more specifically its packing ratio, is an important criterion to take into account to avoid module blocking. Finally, 2D computational fluid dynamics simulations, using the finite element method are performed. One single kinetic parameter is used to fit the experimental data. The simulated concentration profiles are not satisfactory. Nonetheless, predictability of the model seems to be promising: crystal productivities are rather well estimated
Triger, Aurelien. "Procédé hybride cristallisation et séparation membranaire pour le traitement d'un fluide complexe (urine)." Thesis, Toulouse, INSA, 2012. http://www.theses.fr/2012ISAT0045/document.
Повний текст джерелаThe development of decentralized and specific sanitation system is an issue that concerns both the improvement of sanitary conditions in the poorest area of the world and the development of renewable sources of nutrients for agriculture. This study aims to provide some elements about a treatment line including crystallization and membrane separation for the treatment and valorization of urine. Crystallization allows to recover phosphorus and part of nitrogen contained in urine. Membrane separation is used in order to remove bacteria and viruses from urine. To check the potentialities of these processes some tests were performed at labscale with synthetic and real human urines.It was shown that the struvite crystallization by magnesium addition with a ratio Mg:P=1,3:1 allows recovering most of the phosphorus from urine with a very rapid kinetics (about 20s). Influence of mixing conditions, urine storage, organic matter and initial crystals in urine was studied in batch and continuous reactor. Ultrafiltrations of different pretreated urines (no pretreatment, stored urine, stored and crystallized urine) were performed with PES, PAN and PVDF membranes. Mechanisms responsible for an important flux decline during urine flitration were studied. Specific influence of particular, colloidal and soluble fraction on the flux decline was also evidenced. On these basis different possible treatment lines of urines are proposed and discussed
Kalakech, Carla. "Membrane crystallization by pervaporation for paracetamol production and polymorphism control." Electronic Thesis or Diss., Lyon 1, 2024. http://www.theses.fr/2024LYO10300.
Повний текст джерелаCrystallization is a crucial unit operation in process engineering, widely utilized across industries such as chemical, pharmaceutical, and electronics. Despite its importance, current crystallization methods encounter various limitations, impacting the final product quality, production consistency, and the control over the polymorphic form. Recently, membrane processes have emerged as a promising approach to enhance crystallization control, particularly pervaporation, which employs a dense selective membrane. Applied to crystallization, this method allows for the removal of the solvent from a solvent/antisolvent mixture, creating the supersaturation needed for crystallization initiation. The primary goal of this PhD work is to control paracetamol polymorphism through the selective crystallization and stabilization of the metastable form II using membrane crystallization by pervaporation. Paracetamol form II is favored for its high solubility and compressibility compared to the most stable form I, but its instability during crystallization, particularly its rapid solvent-mediated phase transformation (SMPT) to form I, poses significant challenges. To do so, the initial investigation involved producing form II in small quantities through heating and cooling cycles using differential scanning calorimetry (DSC), followed by its characterization using numerous analytical techniques. An offline Fourier transform near infrared spectroscopy (FT-NIR) polymorphism prediction model supported by a chemometric technique like Partial Least Squares Discriminant Analysis (PLS-DA) was developed and validated during seeded batch cooling crystallization. The selective crystallization and stabilization of form II in seeded batch cooling crystallization was optimized by controlling the supersaturation level and the operational temperature. Results demonstrated that maintaining a low temperature (5-10°C) and low supersaturation levels (β = 1.25) extended form II stability for up to 30 min. However, increasing the seed mass did not improve stability, as mechanical stress during seed recuperation generated form I impurities. The application of membrane crystallization by pervaporation for paracetamol polymorphism control revealed that form I crystallized during unseeded operations at different permeation rates and membrane surface to feed volume S/Vc ratios whereas form II stability was around 15 min in supersaturated solution and the SMPT was slowed to at least 49 min during seeded membrane crystallization operations at a supersaturation level of βs=1.1, an operational temperature of 5°C and a seeding temperature of 7.4°C. However, when compared to conventional seeded batch cooling crystallization, form II stability was not improved suggesting a preference form I heterogeneous nucleation which accelerated form II SMPT. The stabilization of form II has been proven to be mainly dependent on the operational and seeding temperatures rather than the permeation rate. On the other hand, membrane crystallization by pervaporation exhibited higher crystallization yields than conventional batch cooling crystallization. The increase of the membrane surface to feed volume (S/Vc) ratio and the permeation rate led to a slight improvement in the antisolvent concentration of almost 5%, which did not affect paracetamol polymorphism but increased the crystallization yield to 43% with no noticeable membrane ageing and irreversible fouling detection for 13 membrane usages
Wehbe, Najah. "Dénitratation de l'eau potable en réacteur catalytique membranaire et photocatalytique." Phd thesis, Université Claude Bernard - Lyon I, 2008. http://tel.archives-ouvertes.fr/tel-00379384.
Повний текст джерелаDauvergne, Julien. "Synthèse et étude physico-chimique de nouveaux tensioactifs utilisables pour la cristallisation 2D sur film lipidique et l’étude des protéines membranaires." Electronic Thesis or Diss., Avignon, 2010. http://www.theses.fr/2010AVIG0233.
Повний текст джерелаThis thesis deals with the synthesis and the physico-chemical study of new surfactants used as tools for holding membrane proteins in aqueous media. A first part presents the existing methods that allow the manipulation of the membrane proteins and describes the current issues encountered which lead to its denaturation. In a second chapter, the synthesis of a hemifluorinated lipid with a specific ligand is presented in order to form a film of Langmuir. The stability and fluidity of the monolayer lipid is monitored and used in experiments of cristallisation 2D following the interfacial concept on the recombinant membrane protein SUR1 « his tag » keep soluble in water with hydrocarbonated detergents. The third part defines the term associated to facial amphiphile and presents a synthesis by « click chemistry » of glucosidic surfactants with an aromatic core persubstitued. The alternated and selective substitution on 1,3,5 and 2,4,6 positions of the aromatic ring by respectively hydrophilic heads and hydrophobic tails induces a facial segregation. The last chapter concerns the study of facial amphiphiles behavior and its physico-chemical properties in aqueous solution by using several methods : tensiometry, dynamic diffusion light scattering, HPLC
Panwar, Pankaj. "Relations structure-fonction des transporteurs nucléotides." Phd thesis, Université de Grenoble, 2012. http://tel.archives-ouvertes.fr/tel-00684264.
Повний текст джерелаDauvergne, Julien. "Synthèse et étude physico-chimique de nouveaux tensioactifs utilisables pour la cristallisation 2D sur film lipidique et l'étude des protéines membranaires." Phd thesis, Université d'Avignon, 2010. http://tel.archives-ouvertes.fr/tel-00496704.
Повний текст джерелаDauvergne, Julien. "Synthèse et étude physico-chimique de nouveaux tensioactifs utilisables pour la cristallisation 2D sur film lipidique et l’étude des protéines membranaires." Thesis, Avignon, 2010. http://www.theses.fr/2010AVIG0233/document.
Повний текст джерелаThis thesis deals with the synthesis and the physico-chemical study of new surfactants used as tools for holding membrane proteins in aqueous media. A first part presents the existing methods that allow the manipulation of the membrane proteins and describes the current issues encountered which lead to its denaturation. In a second chapter, the synthesis of a hemifluorinated lipid with a specific ligand is presented in order to form a film of Langmuir. The stability and fluidity of the monolayer lipid is monitored and used in experiments of cristallisation 2D following the interfacial concept on the recombinant membrane protein SUR1 « his tag » keep soluble in water with hydrocarbonated detergents. The third part defines the term associated to facial amphiphile and presents a synthesis by « click chemistry » of glucosidic surfactants with an aromatic core persubstitued. The alternated and selective substitution on 1,3,5 and 2,4,6 positions of the aromatic ring by respectively hydrophilic heads and hydrophobic tails induces a facial segregation. The last chapter concerns the study of facial amphiphiles behavior and its physico-chemical properties in aqueous solution by using several methods : tensiometry, dynamic diffusion light scattering, HPLC
Crampon, Eric. "Etudes structurales et fonctionnelles des complexes pr-E des virus de la fièvre jaune vaccinale et sauvage." Paris 7, 2010. http://www.theses.fr/2010PA077091.
Повний текст джерелаEnveloped viruses enter cells by membrane fusion, a mechanism that allows the release in the cytoplasm of the infected cell of their genome. Yellow fever virus is the reference virus for Flavivirus, family of enveloped positive single strand RNA viruses. In spite of an efficient vaccine based on an attenuated strain (17D), this virus still causes 200,000 infections per year with 30,000 deaths, mainly in African and South American subtropical areas. Envelope protein E plays a role in two early phenomena of virus cycle, acting during virus entry for receptor recognition and binding, and during membrane fusion. This is the reason why this protein is the main target for the development of new antivirals. We were so interested in determining the crystal structure of this major pathogen antigen. Wild-type Asibi strain and vaccinal 17D-204 strain only differ one of the other by 32 mutations in the whole polyprotein, 12 of them within E protein. To better I understand molecular mechanisms of the vaccine attenuation, we crystallized both proteins from the wild-type and vaccinal strains. With our expression System, we were expecting to produce only the envelope E protein, as it was experienced for other Flaviviruses. But surprisingly, we co-purified and co-crystallized the immature complex of the virus, consisting in pr result of the cleavage of prM as pr + M by the furin) and E, for both Asibi and 17D-204 strains. After dissociation of the complex, we successfully determined affinity I constants, thermodynamical and functionnal characteristics of the complex. Overall, these results can lead to the development of new fusion inhibitors against Flavivirus
Habets, Jidenko Marie. "Etude de l'ATPase Ca2+ du réticulum sarco/endoplasmique : Mise au point d'une nouvelle méthode de purification de SERCA1a de lapin exprimée chez S. cerevisiae permettant sa cristallisation et applications au mutant E309Q-Etude d'une autre isoforme, SERCA3a." Phd thesis, Université Paris Sud - Paris XI, 2005. http://tel.archives-ouvertes.fr/tel-00011204.
Повний текст джерелаCette nouvelle méthode de purification a été appliquée avec succès au mutant SERCA1a-E309Q. De petits cristaux de ce mutant ont pu être isolés. Cette méthode a également permis de purifier SERCA3a, bien que le faible taux d'expression de la protéine de fusion chez S. cerevisiae limite la quantité purifiée. En parallèle, des essais d'immunolocalisation cellulaire de SERCA3a dans différentes lignées cellulaires et dans des coupes de peau ont été réalisés
Книги з теми "Cristallisation membranaire"
Hartmut, Michel, ed. Crystallization of membrane proteins. Boca Raton: CRC Press, 1991.
Знайти повний текст джерелаMichel, Hartmut. Crystallization of Membrane Proteins. Taylor & Francis Group, 2018.
Знайти повний текст джерелаMichel, Hartmut. Crystallization of Membrane Proteins. Taylor & Francis Group, 2018.
Знайти повний текст джерелаMichel, Hartmut. Crystallization of Membrane Proteins. Taylor & Francis Group, 2018.
Знайти повний текст джерела