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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Neurogenèse de la respiration chez la lamproie

Martel, Bruno January 2005 (has links)
Mémoire numérisé par la Direction des bibliothèques de l'Université de Montréal.
2

Esteatosis de origen dietético: ¿la inflamación y la oxidación actúan de forma coordinada?

Rodríguez Sanabria, Fernando 14 December 2010 (has links)
Esteatosis de origen dietético: ¿La inflamación y la Oxidación actúan de forma coordinada? La respuesta metabólica hepática frente a dietas ricas en grasa y colesterol difiere en los ratones con diferentes trastornos metabólicos y carga genética (ApoE-/- y LDLr-/-). Unos responden desarrollando esteatohepatitis y aumentando la expresión de genes relacionados con la inflamación y la oxidación mientras que en otros disminuye la expresión de genes que protegen el desarrollo de esteatosis y obesidad. En humanos, también se aprecian diferencias respecto al desarrollo de esteatosis o esteatohepatitis lo que sugiere que los datos encontrados pueden resultar útiles. Hemos probado la hipótesis de que las moléculas encargadas de la protección frente a la oxidación (principalmente paraoxonasas) actúan de forma coordinada con las quimiocinas responsables del reclutamiento de los macrófagos (proteínas que atraen los monocitos). Presentamos datos que indican que ambas moléculas se expresan constitutivamente en casi todos los tejidos de ratón C57BL/6J. La sorprendente ubicuidad de ambas moléculas y la expresión aparentemente conjunta en las mismas células sugieren que, al menos en el hígado, las respuestas frente a la oxidación y la inflamación pueden estar coordinadas para determinar el curso futuro de las lesiones producidas por el exceso de nutrientes. / Diet-induced hepatic steatosis: Do inflammation and oxidation act coordinately?The metabolic response to high-fat, high-cholesterol diet may differ in mice with different genetic and metabolic background (ApoE-/- and LDLr-/-). Some develop steatohepatitis and increased expression of genes related to both inflammation and oxidation; in others, the expression of genes protective for the development of obesity and steatosis is decreased. Similar differences have been found in humans and consequently obtained data should be considered in translational research. We tested the hypothesis that molecules preventing oxidation (mainly paraoxonases) may coordinately act with responsible effectors for macrophage recruitment (especially monocyte chemoattractant proteins). We present here data indicating that both molecules are constitutively expressed in most tissues from C57BL/6J mice. Surprisingly this ubiquity and the apparent co-expression suggest, at least in liver, that antioxidand and pro-inflammatory responses may jointly determine the course of lesions induced by nutrient excess.
3

Deux écrivains catalans : Jean Amade 1878-1949, Joseph-Sébastien Pons 1886-1962 /

Camps, Christian, January 1986 (has links)
Extrait: Thèse--Lettres--Montpellier, 1980. / Bibliogr. p. 835-908.
4

BRAINSTEM GABAA RECEPTOR SHAPE THE RESPONSE AND ADAPTATION TO HYPOXIA

Hsieh, Yee-Hsee 13 July 2007 (has links)
No description available.
5

A Novel Remodulation Scheme for WDM PONs Using DPSK for Both Downstream and Upstream

Deb, Nebras 09 May 2012 (has links)
Wavelength Division Multiplexing Passive Optical Networks (WDM PONs) offer a great solution to satisfy the increasing demand of bandwidth. In addition, it offers a higher level of data security through virtual point to point connections. A great challenge in realizing cost-effective WDM PON is the need for a transmitter at each Optical Network Unit (ONU) with a dedicated wavelength, which overloads the total cost of the system, in addition to reducing the number of available wavelengths in the system. Remodulation scheme is an ultimate solution for these problems of WDM PONs as the downstream signal itself is remodulated with upstream data which saves the need for a laser source at the ONU side. In this thesis I propose and experimentally demonstrate a novel wavelength remodulation scheme for WDM PONs that employs Differential Phase Shift Keying (DPSK) for downstream and Return to Zero DPSK (RZ-DPSK) for upstream. The use of DPSK enhanced the system with improved receiver sensitivity and RZ-DPSK improved the tolerance toward chromatic dispersion. In addition, I investigate the Backreflection (BR) penalty resulting from beat noise of BRs with upstream signal in a bidirectional WDM PON system that uses remodulation and phase modulation as a modulation format. I experimentally demonstrate the optimal conditions to operate the system and minimize the BR penalty.
6

Croyance, crédulité et superstitions : étude sur les échanges culturels à travers l'affaire Robert Pons (1757-1758)

Cantin, Caroline January 2009 (has links) (PDF)
Malgré l'attention accordée à la mort par les historiens du culturel, l'histoire des revenants a suscité peu d'intérêt. Notre démarche vise à alimenter la connaissance sur cette dimension en tentant de comprendre la croyance aux revenants à l'époque des Lumières, mais plus particulièrement les mécanismes de la croyance qui sont à l'oeuvre dans une affaire bien particulière. Notre dossier met en scène un prêtre qui est accusé d'avoir profité de la crédulité des gens du peuple: à la condition de dire des messes à leur intention, le prêtre Robert Pons certifiait que des agonisants consentent à revenir sur terre une fois morts pour indiquer l'emplacement de trésors. L'affaire, qui prend place à Paris, a été jugée par trois instances judiciaires, l'Officialité, le Châtelet et le Parlement de Paris. Notre propos se concentrera principalement sur le procès mené au Châtelet. Étant donné la complexité du concept de croyance, nous n'avons pas la prétention de repenser la façon de concevoir ce champ d'étude. Cependant, en s'appuyant sur l'historiographie récente en lien avec le processus d'acculturation, nous serons amenés à mettre de l'avant un concept où la flexibilité est de mise, c'est-à-dire que la croyance serait pensée en terme de rationalité, d'échanges et d'hétérogénéité. Par le fait même, notre démarche se propose de repenser le processus d'acculturation à la lumière des mêmes variables évoquées pour cerner le concept de croyance. Afin de mettre à l'épreuve nos thèses, notre propos s'articule autour de trois groupes: les gens du peuple, le prêtre Robert Pons et les magistrats. Une analyse approfondie des interrogatoires révèle que les croyances constituent un univers très complexe puisqu'une logique en paliers est nécessaire pour comprendre les multiples subtilités qui caractérisent l'univers mental des différents groupes. Lorsque nous esquissons la conception de la mort et de l'au-delà de nos protagonistes en fonction de leur groupe d'appartenance, des points de jonction peuvent être établis non seulement au sein d'un même groupe, mais aussi entre les différents groupes. Pour les magistrats, la croyance aux revenants peut sembler inconcevable. Or, en faisant appel au modèle explicatif de Michel de Certeau, nous sommes en mesure de constater que les croyances des gens du peuple et de Pons sont loin d'être irrationnelles. Notre démarche est complétée par une étude du discours des magistrats; en comprenant pourquoi les magistrats ne croient pas à l'affaire des revenants, nous sommes en mesure de confirmer les mécanismes qui génèrent une croyance. Encore une fois, le modèle explicatif de Certeau s'avère précieux et, par ricochet, permet d'introduire une nuance intéressante, à savoir que ce n'est pas parce que les magistrats ne croient pas aux revenants qu'ils rejettent nécessairement toute forme de surnaturel. En vertu des observations relevées dans notre démarche, il est inconcevable de penser l'acculturation comme un processus qui s'abat uniformément sur les masses. D'ailleurs, la figure de Robert Pons constitue une preuve éloquente selon laquelle ce processus est complexe, car, au lieu de maintenir les gens du peuple à l'écart des superstitions comme l'idéal tridentin l'impose, il alimente plutôt les croyances superstitieuses. ______________________________________________________________________________ MOTS-CLÉS DE L’AUTEUR : Revenants, Croyances, Superstitions, Crédulité, Justice, Paris, XVIIIe siècle.
7

A Novel Remodulation Scheme for WDM PONs Using DPSK for Both Downstream and Upstream

Deb, Nebras 09 May 2012 (has links)
Wavelength Division Multiplexing Passive Optical Networks (WDM PONs) offer a great solution to satisfy the increasing demand of bandwidth. In addition, it offers a higher level of data security through virtual point to point connections. A great challenge in realizing cost-effective WDM PON is the need for a transmitter at each Optical Network Unit (ONU) with a dedicated wavelength, which overloads the total cost of the system, in addition to reducing the number of available wavelengths in the system. Remodulation scheme is an ultimate solution for these problems of WDM PONs as the downstream signal itself is remodulated with upstream data which saves the need for a laser source at the ONU side. In this thesis I propose and experimentally demonstrate a novel wavelength remodulation scheme for WDM PONs that employs Differential Phase Shift Keying (DPSK) for downstream and Return to Zero DPSK (RZ-DPSK) for upstream. The use of DPSK enhanced the system with improved receiver sensitivity and RZ-DPSK improved the tolerance toward chromatic dispersion. In addition, I investigate the Backreflection (BR) penalty resulting from beat noise of BRs with upstream signal in a bidirectional WDM PON system that uses remodulation and phase modulation as a modulation format. I experimentally demonstrate the optimal conditions to operate the system and minimize the BR penalty.
8

Brain stem involvement in immune and aversive challenge /

Paues, Jakob, January 2006 (has links)
Diss. (sammanfattning) Linköping : Linköpings universitet, 2006. / Härtill 4 uppsatser.
9

A Novel Remodulation Scheme for WDM PONs Using DPSK for Both Downstream and Upstream

Deb, Nebras January 2012 (has links)
Wavelength Division Multiplexing Passive Optical Networks (WDM PONs) offer a great solution to satisfy the increasing demand of bandwidth. In addition, it offers a higher level of data security through virtual point to point connections. A great challenge in realizing cost-effective WDM PON is the need for a transmitter at each Optical Network Unit (ONU) with a dedicated wavelength, which overloads the total cost of the system, in addition to reducing the number of available wavelengths in the system. Remodulation scheme is an ultimate solution for these problems of WDM PONs as the downstream signal itself is remodulated with upstream data which saves the need for a laser source at the ONU side. In this thesis I propose and experimentally demonstrate a novel wavelength remodulation scheme for WDM PONs that employs Differential Phase Shift Keying (DPSK) for downstream and Return to Zero DPSK (RZ-DPSK) for upstream. The use of DPSK enhanced the system with improved receiver sensitivity and RZ-DPSK improved the tolerance toward chromatic dispersion. In addition, I investigate the Backreflection (BR) penalty resulting from beat noise of BRs with upstream signal in a bidirectional WDM PON system that uses remodulation and phase modulation as a modulation format. I experimentally demonstrate the optimal conditions to operate the system and minimize the BR penalty.
10

Novel Angiotensin II Binding Sites in the Mesopontine Area of the Rat Brain

Rowe, Brian P., Saylor, David L., Speth, Robert C. 26 November 1990 (has links)
Angiotensin II (AII) immunoreactivity in the mesopontine area of the rat brain is distributed through several areas where co-localization of AII receptors has not been established. The current in vitro receptor autoradiography study re-examined the distribution of AII binding using 125I-Sar1, Ile8-AII ([125I]SIAII). When incubations were conducted without sulfhydryl reducing agents, [125I]SIAII binding was observed in the locus coeruleus, inferior colliculus, superior colliculus and the central gray in agreement with previous reports. Novel [125I]SIAII binding sites were detected in the parabrachial nucleus, pedunculopontine tegmental nucleus and the caudal linear raphe nucleus, corresponding with previously reported localization of AII immunoreactivity in these nuclei. [125I]SIAII binding was also found in the paragenual nucleus where the peptide has not been detected. Thus, the observation of novel AII receptors which are sensitive to sulfhydryl reducing agents, resolves several AII-AII receptor mismatches.

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