Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 17 of 17 for “"I/Ca"”.
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Studying Redox Conditions of Devonian and Neoproterozoic Oceans Using I/ca Proxy From Bulk Carbonate Rocks
… is an important trace element in biogeochemical and redox reactions. It has a nearly consistent concentration of ~0.46 μmol/L in the seawater and the inorganic speciation (IO3− and I−) of iodine is primarily controlled by redox conditions in water columns. Iodate (IO3−), not iodide (I−), is …
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Earth’s oceanic oxygen history from Phanerozoic to Pleistocene glacial cycles: insights from the carbonate iodine-to-calcium proxy
… in the oceans is an important part of the significant and complex evolution of Earth’s climate, with great significance for the evolution of life in the oceans. My PhD research has been primarily driven by three major questions: (1) How can we reliably reconstruct oxygen levels in ancient oceans? …
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Modeling and Ion Mapping of Intracellular Calcium Distribution in Molluscan Neural Somata
… constants of 1-3 sec) buffering of intracellular calcium in molluscan cell bodies, a diffusion-reaction model was developed. The model took into account the binding reactions of Ca('2+) with a calcium-indicating dye (arsenazo III) and an endogenous Ca('2+) buffer. The results from this model show …
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Developing iodine proxies for oceanic oxygenation conditions during greenhouse episodes
… ocean oxygenation is a growing concern. Forecasting the geographical and bathymetric extent, rate, and intensity of future deoxygenation and its ecological effects, however, remains highly challenging because of the complex feedbacks in the climate-ocean-biota system. Global warming lowers …
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Crystallographic studies of carbonic anhydrase isoforms and their complexes with inhibitors /
Crystallographic studies of carbonic anhydrase isoforms and their complexes with inhibitors The goal of this study was 1) to solve the crystal structures of the complexes of several CA isoforms with a series of sulfonamide inhibitors using X-ray crystallography technique, 2) to analyze the …
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The content and stable isotopic composition of carbon in spherical micrometeorites
… of extraterrestrial material to the Earth <i>ca</i>.99% is supplied by the micrometeorites. The lifetime of the micrometeroids in the interplanetary medium in extremely ephemeral, but their population is maintained largely by ejection of particles from cometary nuclei and from collisional …
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Quaternary glaciation in the Pindus Mountains, Northwest Greece
Geomorphological and geological evidence for former Quaternary glaciation has been mapped n the Pindus Mountains of Northwest Greece. the dynamics and chronology of glaciation in this area has been established through sedimentological analysis, soil analysis and Uranium-series dating. Four glacial …
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Physiology and pharmacology of flatworm muscle
<p>Pharmacological characterization of voltage-operated Ca2+ channels (VOCCs), in both free-living and parasitic flatworms, has been difficult since the currents carried by these channels are small in amplitude and run down quickly. While the presence of VOCCs in the parasite Schistosoma mansoni …
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Metal complexes of non-heme ligands: biological applications
<p>Oxidative inactivation of proteins (carbonic anhydrase–I, trypsin, chymotrypsin and 20S proteasome) by non–heme iron complexes, and glutathionylation of non–heme cobalt complexes mimicking the N5 coordination environment like that of biologically important cofactor cobalamin or B<sub>12</sub> …
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Staphylococcus aureus Panton-Valentine leukocidin (PVL) alters human neutrophil viability and function
… methicillin-resistant <i>S. aureus</i> (CA-MRSA) infections are the leading cause of community bacterial infections in the United States. Genes encoding Panton-Valentine leukocidin (PVL) are present in most <i>Staphylococcus aureus</i> strains that cause CA-MRSA infections. Despite an …
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Staphylococcus aureus Panton-Valentine leukocidin (PVL) alters human neutrophil viability and function
… methicillin-resistant <i>S. aureus</i> (CA-MRSA) infections are the leading cause of community bacterial infections in the United States. Genes encoding Panton-Valentine leukocidin (PVL) are present in most <i>Staphylococcus aureus</i> strains that cause CA-MRSA infections. Despite an …
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Copper Metallurgy in Cilicia and the Amuq in the Second Millennium BC: Insights into Aspects of Bronze Age Technology and Trade
… investigates the position and significance of the southern Anatolian coast within the exchange networks of the eastern Mediterranean and the Near East during the second millennium BC (Middle and Late Bronze Ages). To investigate this, the project employed chemical and lead isotope …
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Geochemical Insights into Earth Materials from Quantum Mechanical Computation
The application of predictive and illustrative geochemistry, via ab initio structure cal- culation, is explored. These examples span from applications relevant to understanding geochemical proxies in biogenic carbonates, relevant to environments in past and present oceans at the Earth’s surface, …
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Natural and anthropogenic influences on recent sediment characteristics in the Knysna Estuary, South Africa and Yangtze River Estuary, China
… development, thus making them valuable ecological entities. In this study, the Chongming Island tidal flats of the Yangtze River Estuary in China and the Knysna Estuary in South Africa are selected as case studies. The objective of this study is to investigate the recent distribution and …
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Progettazione e sintesi di piccoli peptidi coniugati con macrocicli per la diagnosi e la terapia nelle malattie neurodegenerative.
L'identificazione di bersagli biologici idonei per lo sviluppo di nuove strategie terapeutiche e/o la costruzione di nuove molecole con capacità sensoristiche può rappresentare un approccio promettente per la diagnosi e il trattamento della malattia di Alzheimer (AD). L'AD è la malattia …
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The Hellenistic and Roman Periods at Tell Hesban, Jordan
… Tell Hesban, 9 km north of Madaba, Jordan, was excavated by Andrews University, in cooperation with the American Schools of Oriental Research and the Department of Antiquities of Jordan (five seasons, 1968 to 1976).</p> <p>Evidence from the site suggests it was first occupied in Iron Age I (ca. …
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The influence of acute, chronic and lifelong hypoxia on the functional and structural integrity of the neurovascular unit
… single-blind cross-over design, 12 healthy, physically active male participants (age, 23 ± 2 yrs; BMI, 25 ± 4 kg/m<sup>2</sup>) were exposed to 6 hours of normoxia (F<sub>I</sub>O<sub>2</sub> = 0.21) and 6 hours of acute normobaric hypoxia (F<sub>I</sub>O<sub>2</sub>= 0.12) on separate visits. …