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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 20 of 4334 for “"Iron"”.
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Modeling the Active Sites of [nickel-Iron]- and [iron-Iron]-Hydrogenases
While previous hydride-containing [FeFe]-hydrogenase models featured only bridging hydrides, we sought to prepare complexes of terminal hydrides that would be more relevant to mimicking this hydrogenase. Di-subferrous precursors, such as Fe2(S2C2H4)(CO)4 (PMe3)2, have been known for decades---well …
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Aqueous hydrogen sulphide corrosion of iron, iron/chromium and iron/nickle alloys.
… metal/liquid interphase. In anaerobic acidic environments the rate of corrosion is frequently controlled by a charge-transfer reaction rather than by the rate of diffusion of reactant to (or from) the interphase. These environmental conditions are common to the production and processing of sour …
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IRON NUTRITION DURING EARLY CHILDHOOD. Factors influencing iron status and iron intake.
… of this thesis was to describe the prevalence of iron deficiency (ID) and factors influencing iron status and iron intake among otherwise healthy children. The specific aim in paper I+II was to describe the prevalence of ID among 2 ½-year-old children in relation to intake of cow's milk and …
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The marine geochemistry of iron and iron isotopes
… Atlantic at 10°N, 45°W. Fractionation of iron isotopes could be an effective tool to investigate the geochemistr of iron. Trace metal clean plankton tows, river samples, aerosol leachates, and porewater samples were measured for their iron isotopic composition using a GV Instruments …
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The marine geochemistry of iron and iron isotopes
… Atlantic at 100N, 45 degrees W. Fractionation of iron isotopes could be an effective tool to investigate the geochemistry of iron. Trace metal clean plankton tows, river samples, aerosol leachates, and porewater samples were measured for their iron isotopic composition using a GV Instruments …
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Hydrogen Production From Model Complexes of the [iron-Iron]- and [nickel-Iron]-Hydrogenase Active Sites
… hydride ligand. Thus, we sought a nickel-iron hydride complex to explore the relevant reactivity of the first (mu-H)Ni(mu-SR) 2Fe complex. We found that the previously reported (dppe)Ni(mu-pdt)Fe(CO) 3, a Ni(I)Fe(I) complex, reacted with acid to provide [(dppe)Ni(mu-H)(mu-pdt)Fe(CO) 3]+, …
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Oxidation and morphology of iron and iron alloy droplets.
The oxidation characteristics of iron droplets and a range of binary iron alloy droplets have been investigated at 1600°C. The droplets were generated by a novel technique of melting the iron or iron-alloy, in the form of wire, in a levitation coil. The droplets were held for several minutes in …
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Biogenesis of iron-sulfur clusters and intracellular iron metabolism
Iron-sulfur ([Fe-S]) clusters represent one of natures most diverse and ubiquitous protein prosthetic groups. [Fe-S] proteins are integral for diverse biological processes. Reconstitution of apo-proteins can occur by exogenously adding excess iron and sulfide. However, due to the toxicity of iron …
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Prevention of Iron-Polyphenol Complex Formation in Iron Fortified Tea
The fortification of black tea with iron has the potential to reduce the prevalence of iron deficiency in the developing world. Tea is an ideal vehicle for food fortification because it is centrally processed, is the most consumed beverage globally, aside from water, and is consumed in regular …
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Selective Oxidations by Iron(III) Porphyrins and Iron(III) Corroles
… macrocyclic ligands and the corresponding iron(III) complexes which are fully characterized by UV-vis, GC/MS, and NMR spectroscopies. In this work, the potential of catalytic oxidation reactions towards organic sulfides by these metal complexes were studied. The iron(III) porphyrin and …
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Structural and Spectroscopic Models of the [iron-Iron]-Hydrogenase Enzyme
… the unpaired spin becomes delocalized over both iron centers resulting in two Fe(1.5) metal centers.
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The iron-binding proteins of iron-absorbing rat intestinal mucosa
Iron deficiency anaemia is perhaps the most widespread nutritional deficiency disease; as result, the topic of iron absorption has received intensive investigation over a relatively long period of time. Most of the investigative thrust has come from clinical medicine and allied fields, with some …
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A study of the iron ores at Iron Mountain, Missouri
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Geology, 1931.
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Investigations of Iron–Nitrogen Bonding at Synthetic Iron–Sulfur Clusters
… chemistry of nitrogenous ligands at high-spin iron is investigated through the synthesis and characterization of a terminal imido complex of a cuboidal tetra(μ3-sulfido)tetrairon (Fe4S4) cluster. Structural, spectroscopic, and computational studies establish a dynamic interplay between Fe–N, …
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Iron and Prochlorococcus
Iron availability and primary productivity in the oceans are intricately linked through photosynthesis. At the global scale we understand how iron addition induces phytoplankton blooms through meso-scale iron-addition experiments. At the atomic scale, we can describe the length and type of bonds …
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Iron Isotope Cosmochemistry
<p>Iron is the most abundant element in the Earth and the 4th most abundant in the crust and mantle; Fe is involved in every stage of planetary formation and differentiation. Iron isotope ratios are robust process tracers used to understand the origin of the Solar System, planetary formation, and …
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Iron macrocycle complexes
Thesis. 1975. Ph.D.--Massachusetts Institute of Technology. Dept. of Chemistry.
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Iron and Prochlorococcus/
Iron availability and primary productivity in the oceans are intricately linked through photosynthesis. At the global scale we understand how iron addition induces phytoplankton blooms through meso-scale iron-addition experiments. At the atomic scale, we can describe the length and type of bonds …
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