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Showing 1 to 20 of 29 for “"isomorphous"”.
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Low Resolution ab initio Phasing Method by Modification of Density and Phase in Real and Reciprocal Space
… can be challenging. Several methods, such as Isomorphous Replacement and Molecule Replacement, are frequently used. But their success relies on the availability of either an isomorphous heavy-atom derivative or a high identity homologous model. In this thesis, a low resolution ab initio …
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Structures of lanthanide-edta complexes
… and Holmium were elucidated and found to be isomorphous crystallizing in the orthorhombic space group Fdd1 with Z = 16. In each case , the central metal ion has a coordination mnnber of nine, being bonded to the hexadentate edta ligand and three water molecules. For each structure, anomalous …
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Molecular Recognition of Nucleic Acids
… to the ribose backbone was designed to be isomorphous with the T$\cdot$AT and C$\sp+\cdot$GC base triplets of the Pyr$\cdot$Pur-Pyr triplex motif. The goal of this work was to improve the sequence generality of triple helix formation. In some cases the heterocycles could not be made, while …
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Vibrational studies of tetrahalogenocuprates (II)
… series, the mixed bromochlorocuprates(II) are isomorphous with each other and with the corresponding compounds where n = 0, 4. There is also evidence of discrete CuBrₙCℓ₄₋ₙ²⁻ anions with flattened tetrahedral configurations. The assignment problems associated with the vibrational spectrum of …
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Production of silver-loaded zeolites and investigation of their antimicrobial activity
… zeolites either by ion exchange method or by isomorphous substitution of silver ions into zeolites frameworks and their antimicrobial activity is presented. Silver-loaded zeolites produced by ion-exchange in this work include silver-exchanged zeolite X, silver-exchanged zeolite A and …
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The crystal and molecular structure of thiamine hydroiodide /|nWilliam Edward Lee. -- 260 St. Catharines [Ont.] : Dept. of Chemistry, Brock University,
… molecular and crystal structure was j~dged to be isomorphous to thiaminium tetrachlorocadmate.
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The modification of Laponite® with silver or copper and investigation of their antibacterial activity
… RD were synthesised either by ion exchange or isomorphous substitution into Laponite® RD sheet. Six different concentrations of silver-exchanged Laponite® RD (AGLAP1-6) or copper exchanged Laponite® RD (CULAP1-6) were produced in this work via ion exchange and three different concentrations of …
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Chemical modification of smectite clays
… examined. For Wyoming bentonite the extent of isomorphous substitution increases with decreasing particle size, causing the CEC to similarly increase, although the isomorphous substitution site: edge site ratio remains invarient throughout the particle size range studied.
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STRUCTURE REFINEMENT OF CYTOCHROME C555 (CHLOROBIUM, THIOSULFATOPHILUM).
… was determined by using a single isomorphous derivative, K₂HgI₄, in combination with its anomalous signal. The initial 2.25 angstrom map was modified by the technique of Fourier inversion. The smoothing function for the electron density map addressed three different features in the …
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A study of secondary bonding effects in Werner clathrates
… at -40°C. The dichloromethane clathrate is isomorphous with the chloroform clathrate of the same host, and both these clathrates have a similar packing to the carbon tetrachloride clathrate. There is significant secondary bonding between the sulphur (donor) of the isothiocyanate ligand of …
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Structural studies of the YedU stress protein
… was determined at 2.2 Å resolution in a multiple isomorphous replacement (MIR) experiment. \r\nYedU monomer has an alpha/beta/alpha sandwich domain and a second smaller domain. Between the sandwich domain and the second smaller domain, there is a putative catalytic triad composed of Cys184, …
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The Solid State Simulation of the Structure and Vibrational Modes of Organic, Hybrid Organometallic and Inorganic Species Using the CRYSTAL09 Code.
… and lastly, (c) comparing three isomorphous transition metal complexes with 5-(4-pyridyl)tetrazole as a ligand.</p> <p>In the majority of these systems, with the exception of the polymorphs of vanadium phosphate, terahertz (THz) spectroscopy was used to probe the intermolecular …
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Near-congruent solidification of castings
… became more dendritic, characteristic of an isomorphous system. Even though these alloys did not solidify in a completely cellular manner, they were free of any microshrinkage porosity. The alloys in this study (Cu-Mn and Cu-Mn-Ni) show promise for use in structural applications due to the …
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Suitability of commercial certification assessments for film and video editing courses
… became more dendritic, characteristic of an isomorphous system. Even though these alloys did not solidify in a completely cellular manner, they were free of any microshrinkage porosity. The alloys in this study (Cu-Mn and Cu-Mn-Ni) show promise for use in structural applications due to the …
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Caesium and strontium exchange at specific clay mineral sites
… minerals with a net negative charge arising from isomorphous substitution within the crystal lattice, caesium and strontium sorption is predominantly a cation exchange process. Strontium exchange with charge compensating sodium ions on clay minerals, in the absence of competing cations, results in …
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Synthesis and characterisation of novel ferrocenyl compounds
… The crystal structure of 18 was found to be isomorphous with that of 25. The stability of phosphines 15-20 toward air oxidation was investigated using ³¹P nmr. The phosphines 18, 19 and 20 were found to be remarkably stable in air. The stability of 25 toward oxidation in air was investigated …
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Mechanically Interlocked Linkers for Dynamic Metal-Organic Frameworks
… rings, 22C6, 24C6, and B24C6. Ultimately, an isomorphous series of MIM in MOF materials was able to be created (UWDM-1(22), UWDM-1(24), and UWDM-1(B24)) in which the macrocyclic rings within each material exhibited different degrees of motion. In Chapter 4, a new MIM linker was developed and …
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Nmr Solution Structures Of Two Hairpins Of E. Coli 16s Rrna: The Effects Of Mutations And Chemical Modifications On Structure And Function Of Rrna
… are able to fold into structures that are isomorphous with the wild-type 690 hairpin sequence. The structural comparisons among the functional mutants and the wild-type provides structural validation for previously identified specific functional groups that are crucial for maintaining …
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Exploitation of synergy in oxidation catalysis with bimetallic aluminophosphate catalysts
… catalysts were prepared with the simultaneous isomorphous substitution of cobalt (III) and manganese (III) for aluminium (III) and titanium (IV) replacing phosphorus (V). By substituting simultaneously for both Al (III) and P (V) in the ordered microporous aluminophosphate AlPO-5, the potential …
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Synthesis and investigation of hexacarboxamide cryptands as anionic binucleating ligands by Glen E. Alliger.
… structurally characterized, and were found to be isomorphous with the dicobalt(II) complex. A comparison of the structures is drawn. These compounds have also been characterized by a variety of methods, including SQuID magnetometry, cyclic voltammetry, EPR, and, in the case of the diiron complex, …
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