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.
Results
Showing 1 to 20 of 94 for “"electrostatic interaction"”.
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Graphitic Surface Attachment by Single-Stranded DNA and Metal Nanoparticles
… intrinsic properties have been discovered, their interactions with other materials are only beginning to be explored. The noncovalent binding of single-stranded DNA oligonucleotides to carbon nanotubes and graphene has been seen to give rise to effective gas sensors. We examine similar systems to …
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Mapping Interactions Between Micropatterned Hydrophobic and Hydrophilic Surfaces by Atomic Force Microscopy
Hydrophobic and hydrophilic interactions are not additive and the net interactions between heterogeneous surfaces depend on the relative size of hydrophobic and hydrophilic sites on the surface. Independent on whether the hydrophobic sphere is positioned on top of a hydrophobic or hydrophilic area, …
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Controlling Site-Selectivity in Palladium-Catalysed Cross-Coupling Reactions using Non-Covalent Interactions Between Ligand and Substrate
… cross-coupling reactions by using a non-covalent interaction between a ligand and substrate. A library of phosphine ligands were synthesised that incorporate an anionic or hydrogen bond acceptor group. They were first evaluated in the Mizoroki-Heck reaction with alkenes that bear a complementary …
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Bridging Mesoscale Phenomena and Macroscopic Properties in Block Copolymers Containing Ionic Interactions and Hydrogen Bonding
… of novel block copolymers with non-covalent interactions (electrostatic interaction and/or hydrogen bonding) to examine the relationships between mesoscale phenomenon and macroscopic physical properties. Non-covalent interactions offer extra intra- and inter-molecular interactions to achieve …
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The heat capacity of ammonium chloride near the order-disorder transition
… In particular, the volume dependence of the interaction responsible for the transition is in qualitative agreement with a prediction based upon an octopo1e-octopo1e, electrostatic interaction. The critical exponents a+ and a are found to be in the neighborhood of .7, which is quite different …
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Molecular dynamics studies of membranes and membrane proteins
… free energy perturbation theory and continuum electrostatics calculations. Three systems were investigated: (1) The proton pump cycle of the integral membrane protein bacteriorhodopsin: The photoisomerization and subsequent thermal reactions of the protein were studied by molecular dynamics …
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Investigation of the interactions in RNA recognition motif-RNA complexes: small molecule inhibitors and kinetics of dissociation
… This dissertation aims to help understand the interactions of the RNA recognition motif and RNA by developing a small molecule modulator of the interaction and analyzing the kinetics of dissociation. The first chapter gives an introduction to the function and structural characteristics of RNA …
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Cooperative Electrostatic Polymer-Antibiotic Nanoplexes
… with the cationic aminoglycoside gentamicin. The electrostatic interaction between the anionic polyacrylates and the cationic aminoglycosides form the cores of the nanoplexes, while the amphiphilic nature of the polyethers stabilize their dispersion in physiological media. The amphiphilic nature …
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Elucidation of Design Criteria for Non-Viral Gene Delivery Vector Development
… Chapter 2 examines dissociation by reducing the electrostatic interaction between DNA and the polymeric gene delivery agent polyethylenimine (PEI). The results indicate that weakened polymer/DNA interactions increase gene delivery efficiency and, more generally, that the strength of polymer/DNA …
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A Thermostable Cytochrome P450 From Sulfolobus Solfataricus
… which could potentially affect the normal electrostatic interaction with redox partners involved in electron transfer to the P450 cytochromes. The crystal structures of CYP119 indicate that increased stability may be due to a combination of increased factors involved in stabilizing …
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Defect Engineering for Controlling Semiconductor Diffusion
… can couple to the semiconductor bulk through electrostatic interaction with charged defects. Such coupling manifests itself in the form of a near-surface electric field that halts the motion of charged defects toward the surface and results in increased diffusion. The second mechanism involves …
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Synthesis, Characterization, and Mixed-Valence Studies of Conformationally Constrained Bisferrocenyl Complexes for the Study of Through-Space S***π; Interactions
… showing highly constrained m-terphenyl systems. Interaction of the ferrocene moieties through space mediated by the sulfur were studied by ultra-violet photoelectron spectroscopy (UPS), cyclic voltammetry, differential pulse voltammetry, UV-Vis-NIR spectroscopy and DFT computations. …
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Nuclear charge distribution of ¹⁸¹Ta
… in the following way. The monopole part of the electrostatic interaction, corrected for vacuum polarization, is used in the Dirac equation. Then the electric quadrupole interaction term is diagonalized in the basis formed by the Dirac solutions and the nuclear wave functions. This prescription …
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Unimolecular decomposition kinetics at resolved internal energies.
… reactions involving clusters formed by the electrostatic interaction between transition metal cations and simple organic molecules has been measured at multiple internal energies. The presence of the metal lowers the energy necessary for the reactions to take place. Thus, these reactions …
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Chemistry directed assembly of multilayered polymer thin films and colloidal particles
… to different regions of a surface based on both electrostatic and secondary interactions between the polymer and the surface. This concept of adsorption directed by surface chemistry is universal, in that the same sets of rules derived for polymeric systems can also be applied to molecule and …
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Development of Computational to ols to Target Microrna
… challenging in accurately predicting their interactions with small molecules. To address this issue, my thesis is to develop integrated approaches to screening for novel inhibitors by targeting specific structure motifs in miRNAs. The project starts with implementing a tool to find potential …
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Adsorption and conformation change of short helical peptides on silica and aluminosilicate surfaces
… important features of protein adsorption, the interactions between (-helical peptides and a carefully selected set of model surfaces were studied. The peptide sequences contained three blocks of two to five residues each, with the side chains of the N-terminal and C-terminal blocks having …
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Controlling the assembly of proteins and cells on SiO₂ surfaces
… system, PEG-containing films were formed by an electrostatic interaction between the PAA backbone and the underlying amine-modified surface. In the second system, the formation of
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Fault tolerance issues in nanoelectronics
… and single electron devices, in which the electrostatic interaction between electrons is used to create Boolean circuits, are estimated. On the bases of such results, various fault tolerant solutions are proposed, for both logic and memory nanochips. As for logic chips, traditional …
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Structural Determinants in the folding of epidermal growth factor (EGF)-Like domains
… EGF-like domain. This suggests that side chain interactions are crucial for achieving the canonical EGF-like domain fold but not for the non-canonical fold. Folding under high salt content did not disrupt the folding tendencies of both domains and result in slight increase of the C₁-C₃, C₂-C₄ …
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