Sökning: "thallium"
Visar resultat 16 - 20 av 22 avhandlingar innehållade ordet thallium.
16. Unstable coronary artery disease : non-invasive indicators of severity of coronary lesions and the effects of thrombolysis
Sammanfattning : Non-invasive indicators of severity of coronary lesions and the effects of thrombolysis were evaluated in 205 men, 38 to 70 years of age with unstable coronary aticty disease (CAD)- i.e. unstable angina or non-Q wave myocardial infarction - admitted to the coronary care units in nine hospitals. LÄS MER
17. 201Thallium SPECT; accuracy in astrocytoma diagnosis and treatment evaluation
Sammanfattning : The aims of the studies included in this thesis were:• to investigate the reliability of 201thallium single photon emission computed tomography (201Tl SPECT) for preoperative diagnosis and histological staging of malignant astrocytomas in comparison with CT; • to develop a method for quantification of cerebral thallium uptake, and to evaluate the quantitative measurement in comparison with CT, for astrocytoma treatment follow-up purposes; • to compare quantitative 201Tl SPECT and proton magnetic resonance spectroscopy (1H-MRS) with conventional MR imaging for astrocytoma monitoring, and to evaluate associations between change of morphological tumour characteristics during treatment and changes of cerebral thallium uptake and metabolic ratios. Results and conclusions:• High 201Tl-index, calculated as a ratio comparing tumour uptake to uptake in the contralateral hemisphere, is an indicator of highly malignant astrocytoma. LÄS MER
18. Studies of systems related to high-Tc superconductors by electron microscopy and X-ray powder diffraction
Sammanfattning : New cuprate systems related to high temperature superconductors have been investigated and are reviewed. The synthesized samples have been studied mainly by transmission electron microscopy, energy-dispersive spectrometry and X-ray powder diffraction, in order to determine composition and structure of the formed phases. LÄS MER
19. Solving Mysteries and Outwitting Transitions : Investigating the Incommensurate Crystal Structures of AuIn and Sn3Sb2
Sammanfattning : This thesis introduces two new incommensurate alloys. AuIn shows variable amounts of modulation, depending on the measurement temperature. At 400°C the diffraction pattern shows diffuse scattering and a thallium iodide type Cmcm space group. LÄS MER
20. Regioselective Heck Coupling Reactions : Focus on Green Chemistry
Sammanfattning : Carbon-carbon bond formation reactions are among the most important processes in chemistry, as they represent key steps in the synthesis of more complex molecules from simple precursors. This thesis describes mainly the development of novel regioselective applications of the mild and versatile palladium-catalyzed carbon-carbon coupling method, commonly known as the Heck reaction. LÄS MER