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Статті в журналах з теми "Calcium – Composés – Teneur en phosphates"
Ben Abdallah, Ferjani, Nada Elloumi, Imed Mezghani, Makki Boukhris, and Jean Pierre Garrec. "Réponses d’une vigne locale à une pollution fluorée." Canadian Journal of Botany 84, no. 3 (March 2006): 393–99. http://dx.doi.org/10.1139/b06-010.
Повний текст джерелаBLEUKX, W. "Production et qualité nutritionnelle des phosphates alimentaires." INRAE Productions Animales 18, no. 3 (July 15, 2005): 169–73. http://dx.doi.org/10.20870/productions-animales.2005.18.3.3521.
Повний текст джерелаHecini, Linda, and Samia Achour. "Coagulation-floculation au sulfate d’aluminium de composés organiques phénoliques et effet de sels de calcium et de magnésium." Revue des sciences de l’eau 27, no. 3 (December 15, 2014): 271–80. http://dx.doi.org/10.7202/1027810ar.
Повний текст джерелаGUEGUEN MINERBE, M., I. NOUR, and T. CHAUSSADENT. "Devenir des structures en béton en présence d’H2S – Vers une évolution des classes d’exposition." Techniques Sciences Méthodes, no. 10 (October 20, 2020): 45–50. http://dx.doi.org/10.36904/tsm/202010045.
Повний текст джерелаRosset, R., S. Douville, M. Ben Amor, and K. Walha. "L'inhibition de l'entartrage par les eaux géothermales du sud tunisien. Étude sur site." Revue des sciences de l'eau 12, no. 4 (April 12, 2005): 753–64. http://dx.doi.org/10.7202/705376ar.
Повний текст джерелаBournonville, Blandine, Ange Nzihou, Patrick Sharrock, and Guy Depelsenaire. "Phosphatation de résidus minéraux." Environnement, Ingénierie & Développement N°31 - 3ème Trimestre 2003 (January 1, 2003). http://dx.doi.org/10.46298/eid.2003.8051.
Повний текст джерелаДисертації з теми "Calcium – Composés – Teneur en phosphates"
Debroise, Théau. "Calcium Oxalate and Calcium Phosphate Biominerals : Formation and Stability studied by Molecular Dynamics." Electronic Thesis or Diss., Sorbonne université, 2019. https://theses.hal.science/tel-04059925.
Повний текст джерелаThis thesis is about biomineralisation, the process by which living beings manage to direct the precipitation of minerals present in their environment to make materials useful for the survival of the species in question. Biomineralization is an extremely complex phenomenon involving genetic regulation and the involvement of proteins to trigger mineralization at specific locations. It happens however that it escapes the control of the living organism, then leading to various pathologies. This is the case, for example, when calcifications called kidney stones are formed inside the kidneys. From a certain size, a renal calculus becomes pathological and requires hospital care. The pathology is commonly called urolithiasis. It is established that calcium oxalates, and more particularly the monohydrate (Calcium Oxalate Monohydrate, COM or whewellite) and dihydrate (Calcium Oxalate Dihydrate, COD or Weddellite) phases, make up the majority of kidney stones. The environment, and especially food, is a key factor influencing the formation and composition of kidney stones. Currently, the treatments consist mainly of an injection of analgesics and the ejection of the calculation by the natural channels. If necessary, surgery is performed. Doctors are looking for drugs / treatments that can potentially prevent the formation of kidney stones
Julien, Marion. "Phosphate et différenciation des cellules squelettiques." Nantes, 2007. http://www.theses.fr/2007NANT12VS.
Повний текст джерелаThis study was divided into two parts. The objectives of the main part were to better understand the role of inorganic phosphate (Pi) in the differentiation of cells responsible for endochondral and membranous ossification, respectively the growth plate chondrocytes and the osteoblasts. The regulation of these ossification processes is related to phosphate metabolism. Deregulation of the phosphatemia can lead to rickets or vascular calcification respectively associated with hypo- or hyperphosphatemia. The role of inorganic phosphate (Pi) in chondrocyte and osteoblast differentiation remains largely unexplored. Using in vitro and ex vivo models (cell lines and primary cultures) we showed in a first part that Pi stimulates the matrix Gla protein (MGP) expression via ERK1/2 in skeletal cells. In addition, we showed that the Fra-1 transcription factor is involved in the intracellular mechanisms involved in the Pi-stimulated MGP expression in osteoblasts. Considering the role of MGP in the control of normal and ectopic mineralization, these data contribute to a better knowledge of the role of Pi in bone formation and homeostasis, which are disturbed in the case of phosphatemia deregulation. In the second part, we contributed to the characterization of two calcium phosphate biomaterials, a bioceramic and an ionic cement. Through these studies we explored two paths of research allowing a modulation of the mechanical and biological properties of calcium phosphate biomaterials. This work provided new insights in the management of calcium phosphate biomaterials (improvement of mechanical properties and bioactivity) as well as the design of innovative bone substitutes
Moris, Marc-Antoine. "Synthèse d'analogues de phosphates d'inositol mimes de l'adénophostine." Strasbourg 1, 2006. https://publication-theses.unistra.fr/public/theses_doctorat/2006/MORIS_Marc-Antoine_2006.pdf.
Повний текст джерелаThe aim of this work was the synthesis and the study of the pharmacological properties of adenophostin mimes Ins(1,4,5)P3 analogues. The biological function and targets of Ins(1,4,5)P3 and adenophostin as well as their structure/activity relationships are reported. The therapeutic potential linked to the inositol phosphates cycle is mentioned. The use of a myo-inositol orthoester, inverting the inositol chair conformation, permitted the activation of the position 2 and the introduction of the lateral chains. This work describes an innovative synthetic pathway of adenophostin mimes Ins(1,4,5)P3 analogues possessing a purinylated butylic arm. The pharmacological properties of our analogues are matching those of the Ins(1,4,5)P3. This is more noticeable if we consider the fact that our compounds are racemic. These results support those of previous studies indicating that the position 2 tolerates some substitution, as indicated by the commonly admitted pharmacophore model
Alfaro, Elena. "L'importance des mouvements calciques intra-cellulaires dans la physiologie de l'interaction plaquettes-composés synthétiques." Lyon 1, 1991. http://www.theses.fr/1991LYO1T068.
Повний текст джерелаRoyer, Pascale. "Étude du recouvrement à basse température de matériaux orthopédiques par des phosphates de calcium." Toulouse, INPT, 1993. https://hal.archives-ouvertes.fr/tel-01918832.
Повний текст джерелаNuss, Hermann. "Development of polymeric vesicles as bio-inspired mineralization microreactors." Versailles-St Quentin en Yvelines, 2012. http://www.theses.fr/2012VERS0023.
Повний текст джерелаVesicles are self-assembled structures made of amphiphilic molecules that enclose a small aqueous volume, which is separated from the external aqueous phase, similar to biological cells. In this thesis, we dealt with polymersomes, which are vesicles that are made of polymers. These synthetic objects can be used as chemical microreactors by performing chemical reactions in their interior. Inspired by the biologically controlled mineralization that leads to hard tissues, such as nacre or bones, we aimed at mimicking this natural phenomenon by considering the precipitation of calcium carbonate or calcium phosphate inside such polymer compartments. We developed a microfluidic platform that allows one to trap and manipulate hundreds of vesicles simultaneously. After investigations the vesicle permeability towards water and calcium ions, we managed to make the vesicles selectively permeable to calcium. Finally, we successfully made use of polymer vesicles as microreactors and carried out intravesicular mineralization reactions
Gomez, Hernandez Maria Elena. "Rôle des sédiments dans l'eutrophisation d'une lagune littorale Méditerranéenne (étang du Méjean-Hérault) : échanges du phosphate entre le sédiment et l'eau en fonction des conditions environnementales." Montpellier 1, 1996. http://www.theses.fr/1996MON13520.
Повний текст джерелаMesnage, Valérie. "Contribution à l'étude de la mobilité des formes de phosphate à l'interface eau-sédiment dans les écosystèmes lagunaires." Montpellier 1, 1994. http://www.theses.fr/1994MON13508.
Повний текст джерелаLe, Van Quang. "Caractérisation et biocompatibilité de dépôts de phosphates de calcium sur Ti-6Al-4V obtenus par chimie douce." Thesis, Strasbourg, 2014. http://www.theses.fr/2014STRAE017/document.
Повний текст джерелаTitanium and its alloys based biomaterials are more and more used for medical implants in reconstructing of failed tissue. However to respond to the demand of orthopaedic and dental application, their surfaces have to be modified to increase the osteointegration rate. ln this study, the Ti-6Al-4V alloy surface was firstly mirror polished and treated by an acid solution. Then, a thin film of sodium titanate was formed on its surface via an alkaline-heat treatment. Finally, a calcium phosphate was coated on the sodium titanate layer by using the sol-gel technique or the autocatalytic route. By this process, a bi-phase bioactive sodium titanate/calcium phosphate layer was created on the titanium substrate.After coating, the morphology and the structure of calcium phosphate layer were analyzed by various methods such as FTIR, Raman, XRD, SEM, TEM, EDS-X and SAED. Additionally, a cross-section view of sodium titanate/ calcium phosphate layer was also realized by SEM/ EDS-X.And the adhesion of calcium phosphate layer onto the substrate was verified qualitatively by nano-indenter. The in vitro bioactivity of calcium phosphate coated samples was tested by Kokubo's method using the simulated body fluid (SBF). The in vitro cytotoxicity of calciumphosphate coated samples was estimated by cell viability assay using the osteoblasts MG63.The results showed that the calcium phosphate coating is cytocompatible and strongly bonds to the substrate. ln addition, the calcium phosphate coating was stable in SBF for different soaking periods from 2 to 28 days. And the growth of apatite on the calcium phosphate coated sample surface was identified after 2 days of immersion in SBF
Rakotozandriny, Karol. "Investigation of Calcium Oxalate Crystallization under Microfluidic Conditions for the Understanding of Urolithiasis." Electronic Thesis or Diss., Sorbonne université, 2019. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2019SORUS347.pdf.
Повний текст джерелаOver the past decades, the increase in kidney stone formers has raised the importance to understand the biomineralization process responsible for urolithiasis. Calcium oxalate (CaOx) crystallization – kidney stone main inorganic compound – has largely been characterized under batch synthesis conditions that cannot be regarded as biomimetic with respect to the microscale environment in the kidney and to the urinary flow. In this work, we used a reversible microchannel to mimic the collecting duct in the nephron where CaOx stones can form due to supersaturated levels in calcium and oxalate ions. Within the channel, CaOx crystallization was induced under co-laminar mixing of Ca2+(aq) and Ox2-(aq) ions matching pathological concentrations – i.e. hypercalciuria and moderate hyperoxaluria. Scanning electron microscopy and Raman spectroscopy were used to support our investigations. They showed that CaOx crystals precipitate in a mixture of monohydrated whewellite (CaC2O4.H2O, COM) and dihydrated weddellite (CaC2O4.2H2O, COD) in the microchannel, similar to what is observed by the physicians. In situ information on the kinetics of CaOx crystal growth could be acquired in our microfluidic system. They confirmed the effect of the hydrodynamic and chemical conditions on the growth kinetics and the final chemistry (phase, shape) of the formed CaOx crystals. In a trial to achieve a more complex biomimetic model (formation of kidney stones on a Randall’s plaque), hydroxyapatite was grown also in the microchannel and the CaOx crystal formation was investigated
Книги з теми "Calcium – Composés – Teneur en phosphates"
Organization, World Health, ed. Calcium and magnesium in drinking-water: Public health significance. Geneva, Switzerland: World Health Organization, 2009.
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