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 14 of 14 for “"nickel ions"”.
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Competitive metallation of porphyrins by vanadyl and nickel ions
Includes bibliographical references (pages 55-56).
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Corrosion between orthodontic archwires and bracket couples
Nickel-containing orthodontic wires have been reported to cause allergic reactions in sensitive individuals. An allergic reaction is related to corrosion of the alloys and subsequent leaching of nickel ions into the oral cavity. The purpose of this study was to determine if there is a significant …
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Relating metal binding to DNA binding in the nickel regulatory protein NikR
… cell death. In Escherichia coli, NikR regulates nickel uptake by blocking transcription of the genes encoding the nickel uptake transporter, NikABCDE. NikR is a homotetrameric transcription factor with a central metal binding domain (MBD) that includes the tetrameric interface and two flanking …
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Crystallographic studies of the metal-responsive transcription factor NikR
… toxicity when present at elevated concentrations. Regulation of nickel concentrations in Escherichia coli is achieved via nickel-induced transcriptional repression of the nickel permease complex, NikABCDE, mediated by the NikR metalloregulatory transcription factor. To understand how this …
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Meccanismo catalitico della perossidasi da Euphorbia characias
… and in both the presence and absence of calcium ions showing the presence oh three different pathways. Pathway I: ELP shows catalise-like activity catalyzing decomposition of hydrogen peroxide to water and oxygen; Pathway II involves the return to native enzyme with the concomitant formation of …
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Removal of nickel and lead from natural clay soil through the introduction of EDTA and coupling ion exchange processes with electrokinetic methodology
… of water, produces unfavorable conditions for the transport of heavy metals, namely precipitation. Standard electrokinetic methods have not been employed to a great extent in natural clayey soil. These soils tend to magnify the problems mentioned above and pose several unique problems …
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Investigations into Protein-Surface Interactions via Atomic Force Microscopy and Surface Plasmon Resonance
Protein surface interactions are important in many diverse applications. In this dissertation nonspecific and specific interactions of two proteins (fibrinogen and F1-ATP synthase) with a variety of surfaces have been investigated via atomic force microscopy and surface plasmon resonance. Chapter …
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The use of purified enzymes for the early assessment of toxicity
… and various environmentally significant anions. In addition, several techniques were explored to amplify enzyme response to chemical agents. The results of the study demonstrated that α-chymotrypsin did not significantly respond to cadmium, nickel, or 2,4-D, and consequently, does not …
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Stability of dental alloys in artificial saliva: an electrochemical and XPS investigation
… have been used frequently. Due to allergic reactions of about 10% of the population to nickel ions new nickel-free stainless steels have been developed. In this PhD thesis the Ni-free stainless steel DIN 1.4456 has been studied with electrochemical and XPS surface analytical techniques at 25°C …
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Smart material composites for magnetic field and force sensors
… based sensors are widely used in applications such as automobiles, aircraft, and industrial systems. In past decade, attention has been focused on synthesizing composites that can provide multifunctional properties, i.e., same material exhibits two or more properties. In this group of …
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Kinetic Studies of Sulfide Mineral Oxidation and Xanthate Adsorption
… during mining and processing and SO2 emissions during smelting process. A part of the present study is focused on understanding their behavior, which leads to undesired flotation and difficulties in separation. The major reasons for the undesired flotation are attributed to the …
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Characteristics and Mechanisms of Heavy Metal and MTBE Adsorption on Zeolites and Applications in Permeable Reactive Barriers
… which need to be balanced by exchangeable cations in the lattice of zeolites, leading to a high CEC. Generally, as the Si/Al ratio of zeolites increases, the thermal stability, acid strength and hydrophobicity increase, whereas the ion-exchange capacity decreases. ZSM-5, a typical hydrophobic …