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Academic literature on the topic 'Microscopie optique et électronique corrélative'
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Journal articles on the topic "Microscopie optique et électronique corrélative"
Manus, Jean-Marie. "Carl Zeiss: union microscopie optique et électronique." Revue Francophone des Laboratoires 2012, no. 442 (May 2012): 20. http://dx.doi.org/10.1016/s1773-035x(12)71443-0.
Full textVerger, Louisiane, Olivier Dargaud, and Laurent Cormier. "Couleurs et émaux. Des décors de la Manufacture de Sèvres à la réactivité des pigments." Reflets de la physique, no. 63 (October 2019): 26–29. http://dx.doi.org/10.1051/refdp/201963026.
Full textZhioua, A., H. Elloumi, S. Fourati, G. Merdassi, A. Ben Ammar, B. S. Sajia, A. Chaker, F. Zhioua, and M. H. Jaafoura. "Analyse morphométrique de l’endomètre humain en période d’implantation. Étude en microscopie optique et en microscopie électronique à transmission." Journal de Gynécologie Obstétrique et Biologie de la Reproduction 41, no. 3 (May 2012): 235–42. http://dx.doi.org/10.1016/j.jgyn.2011.11.009.
Full textNicoli, Cécile, Jean-François Carton, Alexis Vaucheret, and Philippe Jacquet. "Caractérisation de la propreté inclusionnaire d’aciers de fonderie par analyse d’images en microscopie électronique à balayage." Metallurgical Research & Technology 116, no. 5 (2019): 511. http://dx.doi.org/10.1051/metal/2018133.
Full textBoström, Sven, Andrij Susulovsky, and Oleksandr Holovachov. "Description of two species of Chiloplectus Andrássy, 1984 (Nematoda: Plectidae) from Ukraine and a revised taxonomy of the genus." Nematology 2, no. 4 (2000): 381–94. http://dx.doi.org/10.1163/156854100509240.
Full textAnas Boussaa, Sabiha, Abdelkrim Kheloufi, and Naïma Zaourar Boutarek. "Caractérisation et valorisation du Quartz d’Edough pour application photovoltaïque." Journal of Renewable Energies 21, no. 3 (September 30, 2018): 391–96. http://dx.doi.org/10.54966/jreen.v21i3.698.
Full textAlizadeh, Azizollah, Etienne Geraert, and Ebrahim Pourjam. "Some pratylenchids from Iran (Nematoda: Tylenchina)." Nematology 2, no. 8 (2000): 855–69. http://dx.doi.org/10.1163/156854100750112806.
Full textAdnane, Mohamed, Toufik Sahraoui, Abdelkader Abderrahmane, Saad Hamzaoui, and Denis Chaumont. "Elaboration et caractérisation des matériaux binaires CuxS et Ag2S élaborés par la technique SILAR pour couche tampon de cellule solaire à base de couche absorbante CIS." Journal of Renewable Energies 13, no. 4 (October 25, 2023). http://dx.doi.org/10.54966/jreen.v13i4.228.
Full textDissertations / Theses on the topic "Microscopie optique et électronique corrélative"
Gemin, Olivier. "Analyse morphométrique et modélisation d'épines des dendrites basales de neurones pyramidaux des couches 2-3 du cortex somato-sensoriel : une étude en microscopie corrélative optique-électronique." Thesis, Paris Sciences et Lettres (ComUE), 2019. http://www.theses.fr/2019PSLEE039.
Full textDendritic spines receive most excitatory synaptic contacts in the cortex, and spine morphology shapes the compartmentalization of synaptic signals. The aim of my thesis has been to develop a correlative light-electron microscopy (CLEM) approach in order to quantify the morphological parameters of identified dendritic spines in intact cortical circuits. I used CLEM to characterize spine ultrastructure along basal dendrites of identified neurons. These measurements were used to constrain a model of dendritic integration. Our model enabled quantifying which proportion of reconstructed spines effectively compartmentalized electrical signals, and we used it to approach the function of a subset of spines that harbour a supernumerary inhibitory contact, the role of which is yet unknown. Our modeling effort unveils a signaling mechanism, prominent in dually-innervated spines, by which an inhibitory signal can attenuate the calcium influx generated in the spine head by an excitatory signal, while depolarization amplitude is unabated, which potentially impacts synaptic plasticity
Benkhaled, Leïla. "Corrélation entre morphologie et comportement électro-optique des matériaux composites cristaux liquides/polymères." Lille 1, 2004. http://www.theses.fr/2004LIL10126.
Full textAmichi, Lynda. "Etude du dopage de type p dans des nanostructures de GaN par corrélation entre sonde atomique tomographique et holographie électronique hors axe optique." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAY088/document.
Full textThe aim of the thesis is to develop a methodology for the investigation of Mg which acts as p-type doping in GaN. We relate the spatial distribution of the dopants with their electrical activity which is achieved by coupling two complementary approaches, Atom Probe Tomography (APT) and Off-axis electron holography. These measurements have also been combined with high-resolution electron microscopy (HR-(S)TEM) for the structural characterization. APT is a unique characterization technique, based on the field effect evaporation of individual atoms of a needle shape sample, allowing the analysis of nano-devices both in terms of morphology and composition in three dimensions at the atomic scale. Off-axis electron holography uses an electron biprism to form an interference pattern from which the electrostatic potential arising from the active dopants can be determined. In this work the experimental procedure has been optimized for both techniques including specimen preparation, the microscope parameters and data treatment to recover accurate information about the position and activity of the dopants. For the holography measurements, a careful analysis of the artifacts that are present in these specimen has been performed to understand the effects of specimen preparation and charging under electron irradiation. We have performed these experiments at high temperature in-situ in the TEM (400 °C) as this increases the ionized dopant concentrations and reduces the artifacts that are present in our measurements. Having developed the methodology, these two techniques are then used to study the effect of temperature and dopant concentrations on the growth of Mg-doped GaN by MOCVD. We have been able to show by APT the existence of precipitates of Mg which are present from a concentration of 3E19 cm-3 whose size and density depends on the growth temperature and the total nominal dopant concentration. Their presence reduces the concentration of dopants that are potentially active in the specimens. However, the measurements of active dopants by holography combined with simulations suggest that the presence of these precipitates do not dominate the electrical properties of the material and that even in very highly doped specimens up to 2E20cm-3 the total active dopant concentrations are still higher than expected from previously published studies. The correlation between these techniques will provide valuable information to improve the Mg activation GaN which is currently a big issue for device manufacture
Fatmaoui, Fadwa. "Determination of pericentric heterochromatin structure by in situ cryo-electron tomography." Electronic Thesis or Diss., Strasbourg, 2024. http://www.theses.fr/2024STRAJ018.
Full textConstitutive heterochromatin is a condensed form of chromatin, essential for the maintenance of genome stability and the defense against retrotransposons and endogenous retroviruses. At the molecular scale, it is characterized by regular nucleosome arrays, DNA and histone methylation and binding of specific heterochromatin-associated proteins (HP1 family). However, it remains unclear how these molecular features lead to the condensed state and define the functional properties of constitutive heterochromatin. The project will address this question by determining the structure of pericentric constitutive heterochromatin directly within its cellular content by using state-of-the-art in situ cryo-electron tomography. Drosophila embryos are used as the experimental model, because in their nuclei, the pericentric heterochromatin regions coalesce into round micron-scale chromocenters. We use cryo-sectioning with diamond knives for sample thinning, and then tomograms of chromocenters, as well as other chromatin domains will be recorded and reconstructed. This will enable us to define the characteristic nucleosome fiber arrangement for the constitutive pericentric heterochromatin by comparison with the chromatin packing in other chromatin compartments
Cerre, Nathalie. "Microscopie en réflexion par fibres optiques : théorie et réalisation." Dijon, 1992. http://www.theses.fr/1992DIJOS010.
Full textToledo, Acosta Bertha Mayela. "Multimodal image registration in 2D and 3D correlative microscopy." Thesis, Rennes 1, 2018. http://www.theses.fr/2018REN1S054/document.
Full textThis thesis is concerned with the definition of an automated registration framework for 2D and 3D correlative microscopy images, in particular for correlative light and electron microscopy (CLEM) images. In recent years, CLEM has become an important and powerful tool in the bioimaging field. By using CLEM, complementary information can be collected from a biological sample. An overlay of the different microscopy images is commonly achieved using techniques involving manual assistance at several steps, which is demanding and time consuming for biologists. To facilitate and disseminate the CLEM process for biologists, the thesis work is focused on creating automatic registration methods that are reliable, easy to use and do not require parameter tuning or complex knowledge. CLEM registration has to deal with many issues due to the differences between electron microscopy and light microscopy images and their acquisition, both in terms of pixel resolution, image size, content, field of view and appearance. We have designed intensity-based methods to align CLEM images in 2D and 3D. They involved a common representation of the LM and EM images using the LoG transform, a pre-alignment step exploiting histogram-based similarities within an exhaustive search, and a fine mutual information-based registration. In addition, we have defined a robust motion model selection method, and a multiscale spot detection method which were exploited in the 2D CLEM registration. Our automated CLEM registration framework was successfully tested on several real 2D and 3D CLEM datasets and the results were validated by biologists, offering an excellent perspective in the usefulness of our methods
Popoff, Michka. "Étude à l’échelle du nanomètre des propriétés mécaniques et électriques de systèmes biologiques." Thesis, Lille 1, 2014. http://www.theses.fr/2014LIL10220/document.
Full textThe atomic force microscope (AFM) is a powerful tool for the study of biological systems. In this work, I was interested in the correlation of four types of microscopies: the atomic force microscopy, the high resolution fluorescence microscopy, the electron microscopy and the kelvin force microscopy (KFM). The correlation of the three first types of microscopies gave birth to the CLAFEM approach (Correlative Light Atomic Force Electron Microscopies). This technique allowed me to detect intracellular organelles, like the Golgi apparatus and mitochondria. Actin tails due to the infection of cells by the Shigella flexneri bacterium, and the entry site of Yersinia pseudotuberculosis bacteria were imaged with this approach. In parallel to this experimental part, I developed a software, called pyAF, for the analysis of force curves and the correlation of the different types of microscopies. In a second part, I measured electrical properties by KFM and explored the possibility to use KFM in liquid. Electrical properties of tobacco mosaic viruses were studied in air, using conventional cantilevers. I also used a new type of probe, called Kolibri, which is a quartz resonator oscillating at 1 MHz, in air and in liquid
Mazelet-Parize, Gabrielle. "Observations de défauts et de structures en microscopie optique et électronique dans des polymères cristaux liquides." Paris 11, 1987. http://www.theses.fr/1987PA112451.
Full textRousselot, Philippe. "Les afférences sensorielles mamelonnaires chez la rate allaitante : étude hodologique et immunohistochimique en microscopie optique et électronique." Bordeaux 2, 1992. http://www.theses.fr/1992BOR28185.
Full textRamade, Julien. "Spectroscopie optique et microscopie électronique environnementale de nanoparticules Ag-In et Ag-Fe en présence de gaz réactifs." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSE1221/document.
Full textBimetallic nanoparticles (NPs) are known to present interesting catalytic properties justifying their use in several industrial processes in the domain of heterogeneous catalysis. However, their (chemical, geometrical, electronical) structure may evolve under realistic reactive atmosphere, involving a modification of their properties. In this multidisciplinary work, the aim is focused on the surface reactivity monitoring of these NPs under controlled gaseous environment. For this purpose, we developed an in situ spectrophotometer based on spatial modulation to monitor the structure evolution of a large assembly of NPs through the study of their localized surface plasmon resonance (LSPR). This global approach has been coupled with a more local approach by environmental transmission electronic microscopy (E-TEM). E-TEM observations have shown both composition and environmental effects on the chemical structure of Ag-In NPs. This structure evolves from a stable low-enriched indium alloy to a core@shell configuration with a shell composed of indium oxide as the indium atomic concentration increases. Furthermore, stable structure (core@shell, Janus, reduced system) domains were evidenced under reducing atmosphere, depending on the temperature and hydrogen pressure. Lastly, Ag-Fe NP oxido-reduction was monitored on the new setup through LSPR modifications. MET observations, environmental plasmonics and simulations (optical response, Monte-Carlo simulations) suggest that these metals are initially segregated, with an enriched-silver surface. The exposure to an oxidative atmosphere seems to induce the diffusion of iron onto the surface, followed by the formation of magnetite (Fe3O4)