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Showing 1 to 20 of 368 for “"Active Sites"”.
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Structural studies on enzyme active sites
… into the heart of biological catalysis, the active site, aiming to structurally characterise catalytic residues and their geometric disposition, which facilitates catalysis. A curated dataset of mechanisms and catalytic residue annotations for ∼ 1000 enzyme families (the *Mechanism and …
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Rational design of hydrogen-free catalytic active sites
… inspired reactivity are based on enzymatic active sites, which are reengineered into robust metal-organic fluoroalkylated scaffolds that, for the first time, exhibit structural asymmetry and tunable [pi]-[pi] interactions both in solution and solid state. In these complexes, labile C-H bonds …
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Oxidation Chemistries Over Catalysts Containing M-N4 Active Sites
… porous catalysts, the development of active site structure-function relationships are convoluted by heterogeneities in metal binding site structures. One strategy to overcome these limitations is to encapsulate a metal-containing molecular complex within a porous host. Metal …
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A study of active sites on fibrillar alumina catalysts
… both the concentration and chemical nature of active sites on two kinds of fibrous alumina catalysts. The results of this investigation are comparable to results reported in the literature describing similar reactions studied over more conventional forms of gamma alumina. However, there were a …
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Population of Active Sites in Nucleate Boiling Heat Transfer
Made available in DSpace on 2014-12-05T17:15:29Z (GMT). No. of bitstreams: 1 6000183.pdf: 4820994 bytes, checksum: 80116481a960348eac3fab35ac59798d (MD5) Previous issue date: 1959
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Small Phosphomonoesters as Probes of Protein-Tyrosine Phosphatase Active Sites
… N-(cyclohexane carboxyl)-O-phospho-L-serine. The active site of VHR was mapped and amino acid residues potentially involved in binding N-(cyclohexane carboxyl)-O-phospho-L-serine were identified. The amino acid sequence of VHR was aligned with the amino acid sequences of IphP and Cdc14 to identify …
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Modeling the Active Sites of [nickel-Iron]- and [iron-Iron]-Hydrogenases
… before the elucidation of the structure of the active site. Two-electron oxidation of Fe2(S2C2H4)(CO)4(PMe 3)2 in the presence of excess PMe3 in MeCN resulted in the formation of the diferrous [Fe2(S2C2H 4)(mu-CO)(NCMe)(CO)(PMe3)4](PF 6)2. This complex, when treated with hydride sources such as …
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An investigation into the active sites in co-reactants for carbonless copying paper
The work presented in this thesis is a study of certain aspects of the surface chemistry of materials used as co-reactants in carbonless copying paper and of some materials which show promise for such a use. The areas investigated include the ion exchange characteristics of acid activated clays, …
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The Nature of Active Sites in Catalytic Zeolites and Metal Dichalcogenide Inclusion Complexes
Made available in DSpace on 2014-12-13T20:10:50Z (GMT). No. of bitstreams: 1 8009187.pdf: 3477349 bytes, checksum: 890e0d717cec6a9569e3ac1d3407276c (MD5) Previous issue date: 1979
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Effects of HCDR transplantation on the biochemical properties of diverse antibody active sites
The diverse active site structures of Map 4-4-20 (pocket; anti-fluorescein) and 04-01(cleft; anti-ssDNA) have been studied extensively (Herron et al., 1989; Denzin et al., 1991; Herron et al., 1991; Denzin et al., 1993; Rumbley et al., 1993), and have led to the hypothesis that the unique …
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Hydrogen production from model complexes of the [FeFe]- and [NiFe]-hydrogenase active sites
… function to oxidize hydrogen. The active sites of both enzymes contain first-row transition metals and biologically exotic ligands. When assayed for their rates and efficiencies of hydrogen processing, the hydrogenase enzymes are directly comparable to platinum. Unfortunately, …
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Understanding the active sites and reaction mechanism of water oxidation on metal oxides
Solar energy irradiating the Earth's surface exceeds human energy consumption by four orders of magnitude and the key to alleviating the global energy crisis lies in efficiently harnessing it. An ideal means of storing surplus energy from solar is to convert it to hydrogen using proton exchange …
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Detailed chemical and spectroscopic probes of the multicopper active sites in Rhus laccase
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Chemistry, 1985
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Model complexes for active sites of diiron metalloproteins, dioxygen reactivity and water effects
… iron(II) complexes with the vacant coordination sites for O₂ binding. Reactions of such complexes with O₂ resulted in rare asymmetric complexes having an [Fe₂...CR)]³⁺ or [Fe₂...CR)]³⁺ unit. These diiron(III) complexes with carboxylate-rich metal coordination environments reproduce the …
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Anodic alcohol fuel cell reactions at platinum active sites on doped metal oxide supports
… supported platinum catalyst (Pt/C). As attractive as these devices may seem, their practicality is often limited by the functionality of the carbon support, which can be prone to corrosion. To limit the corrosion associated with a carbon-based catalyst, metal oxide supports are an area of …
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Challenging Theories in Surface Science: Models of Active Sites and Carbon Monoxide Surface Binding
The reactions of 1,1,1,5,5,5-hexafluoro-2,4-pentanedione on O/Pt(110) have been studied with temperature-programmed desorption. Unlike hexafluoropentanedione on oxygen-precovered nickel and copper, hexafluoropentanedione does not etch oxygen-precovered platinum. Hexafluoropentanedione decomposes …
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Hydrogen Production From Model Complexes of the [iron-Iron]- and [nickel-Iron]-Hydrogenase Active Sites
… efforts focused on structural models for the active site, and neglected the catalytically imperative 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 …
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Expanding the chemistry of a cupredoxin by designing nonnative active sites and using abiological metals
… characterized and there is still debate over reactive intermediate responsible for the oxidative transformation. As a supplementary method to studying these native proteins, designing artificial metalloproteins can serve two important functions: 1) allowing characterization and study of …
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Oxidation of substrates tethered to N-donor ligands for modeling non-heme diiron enzyme active sites
Chapter 1. Modeling Carboxylate-Rich Diiron Sites of Dioxygen-Dependent Non-Heme Enzymes Carboxylate-bridged diiron centers are employed in a variety of biological systems to activate dioxygen for substrate oxidation, and small molecule models have been synthesized to mimic this chemistry outside …
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