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 20 of 57 for “"Two-metal"”.
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CHARACTERIZATION OF TWO METAL TRANSPORTERS HMA3 AND NRAMP1 IN TWO ECOTYPES OF THE ZN/CD HYPERACCUMULATOR THLASPI CAERULESCENS COMPARED WITH ARABIDOPSIS THALIANA
Accumulation of a given metal in plants depends on a delicate and precise balance of various biological processes. Some plants have developed strategies that allow them to tolerate heavy metals in extreme conditions without suffering toxicity. This research focuses on the characterization of two …
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Synthesis and characterisation of low-cost biopolymeric/mineral composite systems and evaluation of their potential application for heavy metal removal
Heavy metal pollution and waste management are two major environmental problems faced in the world today. Anthropogenic sources of heavy metals, especially effluent from industries, are serious environmental and health concerns by polluting surface and ground waters. Similarly, on a global scale, …
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Mechanistic Investigations of Mandelate Racemase: The Electrophilic Catalysts
… All the family members have highly conserved metal ion ligands. Based on the homology to enolase, which requires two divalent metal ions, MR as well as other members of the enolase superfamily might require two metal ions. The stoichiometries of metal ion requirements for MR, muconate …
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Metal-free C-H functionalisation methods
This thesis describes the development of two metal-free C–H functionalisation methods which encompass oxidations of sp³- and sp²-hybridised C–H bonds.Chapter 1 provides a brief introduction to the rapidly growing area of C–H functionalisation and outlines selected metal-catalysed and metal-free C–H …
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A High Power Microwave Zoom Antenna With Metal Plate Lenses
… was designed and constructed with the use of metal plate lenses. Proof of concept was achieved through experiment as well as simulation. This concept comprises a horn feed antenna and two metal plate lenses. Good agreement was found between experiment and simulation. This antenna provides true …
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Studies towards the total synthesis of labiatin A
… towards the total synthesis of labiatin A using metal carbenoid chemistry. The work described herein shows the most recent contribution to this field from our research group. Chapter I provides an introduction to metal carbenoids and their uses in organic synthesis. In particular, the synthesis …
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Synthesis, characterisation and in vitro studies of metal complexes of some selected antimalarial drugs
… characterization and in vitro studies of metal complexes of antimalarial drugs. The synthetic techniques were based on the modification of antimalarial drugs by the introduction of metal ions into the molecular structure of the drugs. Thirty two metal complexes derived from chloroquine, …
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Pressure Tuning Spectroscopy of Metal Cluster Compounds and Organometallics
The effect of hydrostatic pressure upon various metal cluster compounds and organometallics was studied through the use of electronic absorption and infrared spectroscopies. The systems studied were chosen for their use as potential models for chemisorbed metallic surfaces, and to gain a better …
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X-ray crystallographic studies on the self-condensation products of o-aminobenzaldehyde and anthranilic acid and of the metal complexes of some related tetra-azamacrocycles.
… The crystal structures of the tetramer and of two solvates of the trimer (CHCI3 and CH3CN.H2O) were determined. These two compounds, also, have a fused heptacyclic double saddle-shape overall structure. Their structures are compared with those of the TAAB salts. Related types of hydrogen …
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Dianionic Janus-Type N-Heterocyclic Carbenes and their Zwitterionic Gold and Silver Metal Complexes
… describes the synthesis and characterization of two new dianionic bis(maloNHC). The corresponding thiones were generated by the reaction of the free carbenes with an excess of sulfur. The utility of these extended biscarbenes for the construction of homobimetallic systems has been demonstrated by …
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Multi-Method Investigation of the Mechanism of Surfactant-Induced Chromatotropism of Metal-Chelometric Dye Complexes
… (UV-vis) spectroscopic properties of certain metal-dye complexes has been largely ignored in the chemical literature. In this manuscript a model is developed to describe this mechanism. Intramolecular forces among surfactant molecules and host molecules are described to emphasize the …
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The Photochemical Reactions of Dirhenium Decacarbonyl With Water and of Dinuclear Rhenium Carbonyl Complexes Substituted by Nitrogen Bases
… molecules, oxidative addition of H-OH across two metal centers, and metal carbonyl hydride elimination. Supporting thermal and photochemical reactions of Re(,2)(CO)(,10) and eq-Re(,2)(CO)(,9)(OH(,2)) are also described.
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Novel Devices for Terahertz Wave Imaging, Wave-guiding and Sensing
… imaging. This imaging probe consists of two metal plates with the plate spacing gradually tapered from one end to the other. We proved that the space tapering enables this probe to propagate the broadband THz waves efficiently (with low-loss, no cut-off and nearly no dispersion) from the …
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Thermodynamic Studies of Metal Carboxylates
… the chemistry and physical properties of metal clusters a quantitative study of the chemical reactivity of numerous metal carboxylates was performed. Dimeric metal carboxylates were chosen for such a study because of the extensive structural information available on them. The …
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Ligand Manipulation and Reactivity Studies of Organometallic High Valent Palladium Complexes
… group reported the first mononuclear organometallic Pd(III) complexes stabilized by a flexible tetradentate macrocyclic <super>tBu</super>N4 ligand (N,N'-di-tert-butyl-2,11-diaza[3.3](2,6)pyridinophane). To continue our study in this field, we manipulated the pyridinophane macrocylic ligand …
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Cloning, expression, and characterization of lactic acid bacteria recombinant prolidases
… modelling suggested a 80 kDa homodimer with two metal cations at the catalytic centre of the prolidase. The optimum temperature was 50 ºC and showed more than 50% activities between 40 and 55 ºC. The enzyme was most stable at 30 ºC and withstood 20 min of heat-treatment up to 60 ºC, however, …
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Investigation of anthracycline based topoisomerase II inhibitors in triple negative breast cancer
… mechanism of action of the MTX analogue KP71 and two metal organic frameworks (MOFs), UiO-66 and UiO-66-NH2, loaded with MTX, for TNBC treatment, in comparison to free MTX. KP71 exhibited significant anti-proliferative activity in BCa cell lines (MDA-MB-231, MDA-MB-468, and MCF7) using the 3-[4, …
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Probing the liquid-vapor interface in microstructured heat exchangers
This thesis describes two aspects of a project designed to understand the liquid-vapor interface in microstructured heat exchangers. The two aspects include: design and fabrication of a custom vacuum chamber faceplate and the investigation of the liquid meniscus shape on microstructured devices. …
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Catalytic Studies Of Noble Metal Nanocatalysts Using Single-Molecule Fluorescence Microscopy
Noble metal nanoparticles are an important class of catalysts. However they are inherently heterogeneous, which makes studying them at the single-particle level desirable, as it then becomes possible to quantify these differences. A highthroughput fluorescence microscopy technique was developed in …
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