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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.
51

Origin of rutile-bearing ilmenite Fe-Ti deposits in Proterozoic anorthosite massifs of the Grenville Province

Morisset, Caroline-Emmanuelle 11 1900 (has links)
The Saint-Urbain and Big Island rutile-bearing ilmenite Fe-Ti oxide deposits are located in the composite 450 km² Saint-Urbain anorthosite (1055-1046 Ma, U-Pb zircon) and in the Lac Allard intrusion (1057-1062 Ma, U-Pb zircon) of the 11,000 km² Havre-Saint Pierre anorthosite suite, respectively, in the Grenville Province of Eastern Canada. Slow cooling rates of 3-4°C/m.y. are estimated for both anorthosites, based on combined U-Pb zircon/rutile/apatite and ⁴⁰Ar/³⁹ Ar biotite/plagioclase geochronology, and resulted from emplacement during the active Ottawan Orogeny. Slow cooling facilitated (1) diffusion of Zr from ilmenite and rutile, producing thin (10-100 microns) zircon rims on these minerals, and (2) formation of sapphirine via sub-so lidus reactions of the type: spinel + orthopyroxene + rutile ± corundum → sapphirine + ilmenite. New chemical and analytical methods were developed to determine the trace element concentrations and Hf isotopic compositions of Ti-based oxides. Rutile is a magmatic phase in the deposits with minimum crystallization temperatures of 781°C to 1016°C, calculated by Zr-in rutile thermometry. Ilmenite present in rutile-free samples has higher Xhem (hematite proportion in ilmenite), higher high field strength element concentrations (Xhem = 30-17; Nb = 16.1-30.5 ppm; Ta 1.28-1.70 ppm), and crystallized at higher temperatures than ilmenite with more fractionated compositions (Xhem = 21-11; Nb = 1.36-3.11 ppm; Ta = <0.18 ppm) from rutile-bearing rocks. The oxide deposits formed by density segregation and accumulation at the bottom of magma reservoirs, in conditions closed to oxygen, from magmas enriched in Fe and Ti. The initial ¹⁷⁶Hf/¹⁷⁷ Hf of rutile and ilmenite (Saint Urbain [SU] = 0.28219-0.28227, Big Island [BI] = 0.28218-0.28222), and the initial Pb isotopic ratios (e.g.²⁰⁶Pb/²⁰⁴ Pb: SU = 17.134-17.164, BI = 17.012-17.036) and ⁸⁷Sr/⁸⁶ Sr (SU = 0.70399-0.70532, BI = 0.70412-0.70427) of plagioclase from the deposits overlap with the initial isotopic ratios of ilmenite and plagioclase from each host anorthosite, which indicates that they have common parent magmas and sources. The parent magmas were derived from a relatively depleted mantle reservoir that appears to be the primary source of all Grenvillian anorthosite massifs and existed for --600 m.y. along the margin of Laurentia during the Proterozoic. / Science, Faculty of / Earth, Ocean and Atmospheric Sciences, Department of / Graduate
52

Caractérisation du rôle de SR-BI dans les macrophages dans le développement de l'athérosclérose / Characterization of the role of SR-BI in macrophages in atherosclerosis development

Galle, Lauriane 17 September 2015 (has links)
L’athérosclérose est une pathologie chronique inflammatoire qui résulte du dérèglement d’une réaction inflammatoire non résolue ayant pour but initial d’éliminer l’accumulation excessive de lipides au niveau de l’intima. Cette élimination est exercée par les monocytes/macrophages, dont l’infiltration et l’accumulation au niveau des lésions contribue à l’inflammation chronique locale.SR-BI est un récepteur scavenger multi-fonction capable de reconnaître un large spectre de ligands allant des lipoprotéines natives et modifiées jusqu’aux endotoxines. Outre de jouer un rôle crucial dans l’homéostasie du cholestérol dans le foie, est considéré comme un PRR capable d’être impliqué dans l’immunité inné. Un nombre croissant de données suggère un rôle athéro-protecteur de SR-BI dans les cellules dérivées de la moelle osseuse et notamment dans les macrophages. La contribution de SR-BI dans les macrophages au cours de l’athérosclérose et l’identification des mécanismes sous-jacents ne sont pas élucidées. Nous avons démontré que la délétion de SR-BI dans les macrophages entraîne une accélération du développement de l’athérosclérose et une augmentation de la cellularité au sein des lésions en absence d’effet sur la cholestérolémie. Ces effets athéro-protecteurs peuvent être attribués à une diminution de l’apoptose et à une augmentation de la prolifération cellulaire au sein des plaques.Nos données suggèrent également que la diminution de la susceptibilité à l’apoptose des macrophages déficients en SR-BI pourrait impliquer la voie d’activation P38. En parallèle de cette étude, le rôle de SR-BI dans la réponse inflammatoire a été exploré dans des conditions d’endotoxémie. / Atherosclerosis is a chronic inflammatory pathology which results from an uncontrolled inflammatory reaction secondary to an abnormal accumulation of lipids in the intima. The lipid clearance is performed by monocytes/macrophages. Their infiltration and accumulation in lesions contribute/ enhance the chronic local inflammation. SR-BI is a multifunction scavenger receptor capable of recognizing and binding a large spectrum of ligands from native and modified lipoproteins to endotoxins. Besides its crucial role in cholesterol homeostasis in the liver, SR-BI is also described as a PRR. An increasing number of data suggests that SR-BI exerts an atheroprotective role in bone marrow-derived cells and in particular macrophages.The specific contribution of SR-BI in macrophages in atherosclerosis development and the identification of the underlying mechanisms have yet to be elucidated.We have demonstrated that SR-BI deletion in macrophages increases atherosclerosis development and lesion cellularity without affecting cholesterolemia. These atheroprotective effects could be explained by decreased apoptosis and increased cell proliferation in plaques.Our data also suggest that the decrease in apoptosis sensitivity in SR-BI deficient macrophages could involve the P38 MAPK and STAT1 signaling pathways.In parallel to this study, the role of SR-BI in the inflammatory response has also been explored in endotoxemia and sepsis.
53

Význam malých a stredných podnikov pre rozvoj zahraničného obchodu Slovenskej republiky / The importance of SMEs for the development of foreign trade of Slovak Republic

Blažeková, Zuzana January 2013 (has links)
The main aim of my thesis is to characterize and quantify the importance of SMEs to the economy and foreign trade of Slovak Republic. The thesis is divided into four chapters. The first chapter describes SMEs sector and its main features.The second chapter focuses on the analysis of the position of SMEs in the economy of Slovakia.The third chapter analyzes the significance of SMEs for Slovakia's foreign trade. The aim of the last chapter is to characterize the various support options available for Slovak SMEs.
54

Dynamika zahraničního obchodu Slovenské republiky se státy EU

Havlíčková, Martina January 2017 (has links)
HAVLÍČKOVÁ, M., Dynamics of the comparative advantages in Slovak exports com-pared to the European Union. Diploma thesis. Brno: Mendel University in Brno. 2017. The thesis deals with the evaluation of the development of Slovak exports in rela-tion to the changes that occurred after theaccession of the Slovac Republic to the EU or as a result of the crisis in 2008 and 2009 The data analysed in this thesis come from the website of the Statistical Office of the Slovak Republic and Eurostat. The aim of the thesis is to evaluate the dynamics of comparative advantages of the Slovak economy in terms of export some groups of products according to the classification SITC1 compared to the countries of the European Union using gravity model and regression analysis.
55

小胞体膜タンパク質TRICチャネルの分子機能解析

飯田, 綱規 23 March 2017 (has links)
京都大学 / 0048 / 新制・課程博士 / 博士(薬科学) / 甲第20304号 / 薬科博第73号 / 新制||薬科||8(附属図書館) / 京都大学大学院薬学研究科薬科学専攻 / (主査)教授 竹島 浩, 教授 中山 和久, 教授 金子 周司 / 学位規則第4条第1項該当 / Doctor of Pharmaceutical Sciences / Kyoto University / DFAM
56

Analysis of the microvascular morphology and hemodynamics of breast cancer in mice using SPring-8 synchrotron radiation microangiography / SPring-8放射光微小血管造影法を利用したマウス腫瘍微小血管形態および血流動態の検討

Nishi(Torii), Masae 26 March 2018 (has links)
京都大学 / 0048 / 新制・課程博士 / 博士(医学) / 甲第20980号 / 医博第4326号 / 新制||医||1026(附属図書館) / 京都大学大学院医学研究科医学専攻 / (主査)教授 原田 浩, 教授 松田 道行, 教授 横出 正之 / 学位規則第4条第1項該当 / Doctor of Medical Science / Kyoto University / DFAM
57

From Volcanoes To Vineyards: Applications Of Radiogenic Isotopes To Problems In Oceanic Island Volcanism And Wine Forensics

Daly, George Edward 13 April 2023 (has links)
No description available.
58

Timescales of Oceanic Lithosphere Hydration: Constraints from Rodingites, Apennines, Italy

Lorthioir, Charlotte January 2023 (has links)
Thesis advisor: Ethan Baxter / Serpentinites assume a critical role in geochemical and geophysical cycles, from recycling fluid into the sub-arc mantle to facilitating exhumation within subduction zones. Rodingite dikes can be used as a lens to investigate the hydration of the oceanic lithosphere as their development is synchronous with serpentinization, and while serpentinites lack sufficient mineral phases for geochronology, rodingite dikes are rich in andradite and grossular garnet which are potentially amenable for geochronology. This research seeks to constrain the timescales and duration of hydration of the oceanic lithosphere within the Alpine Tethys ocean basin, and associated serpentinization, by examining Apennines rodingites from the Internal Ligurides (Italy). These rodingites experienced seafloor hydrothermal alteration and were obducted onto the continental margin during Alpine orogenesis. As a result, they are ideal for studying seafloor metasomatism as they were not affected by prograde subduction zone metamorphism and dehydration. Sr isotopic and trace element profiles were constructed across two rodingite-serpentinite transects, revealing a complex, multi-stage hydration history consisting of 1) Widespread serpentinization, 2) Gabbroic intrusions, 3) Rodingitization, and 4) Localized, late-stage advective fluid flow. Serpentinizing fluids locally display strong continental crustal isotopic signatures, while rodingitization fluids are characterized by seawater-like values. U-Pb geochronology on rodingite garnets produced an age of 96.1 ± 8.9 Ma, which could represent either the main rodingitization phase or the late-stage advective alteration. / Thesis (MS) — Boston College, 2023. / Submitted to: Boston College. Graduate School of Arts and Sciences. / Discipline: Earth and Environmental Sciences.
59

Elucidating a Role of Btf and TRAP150 in pre-mRNA Processing and Cell Cycle Progression

Varia, Sapna N. 06 June 2013 (has links)
No description available.
60

Construction of a 408 nm Laser System for Use in Ion Interferometry

Archibald, Lawrence 01 December 2015 (has links) (PDF)
This work reports on the construction of a 408 nm laser system designed to drive stimulated Raman transitions between the F = 4 and F = 5 2 S 1/2 states of 87 Sr + using the 2 P 3/2 state as the intermediate state. This laser system will be used as part of a 87 Sr + ion interferometer. This work also includes a discussion of relevant theory describing the interaction of the ions and laser, along with a calculation of the transition rates as a function of laser power and detuning.

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