Includes bibliographical references (leaves 205-227) A study of phase conjugation by stimulated Brillouin scattering is presented with emphasis on the limiting factors, such as aperture and polarization losses, spatial coherence and saturation of the incident wave on the quality of phase conjugation, as well as the application of stimulated Brillouin scattering to loop phase-cojugated mirror and intracavity-SBS-cell-phase-conjugated oscillator.

Thesis (Ph. D.)--University of Texas at Austin, 2002. / Vita. Includes bibliographical references. Available also from UMI Company.

R1162 is efficiently mobilized during conjugation by IncP-1 plasmids such as RK2 and R751. Transfer is terminated when the transferred strand, linearized at the 38 base-pair origin of transfer (oriT), is recircularized by the plasmid encoded protein MobA. For strand rejoining, MobA covalently linked to the 5' end of the strand rejoins the ends by a reversible transesterification reaction. The minimal oriT fragment of R1162 contains a highly conserved 12 base region (core) including the cleavage site and a ten base imperfect inverted repeat (IR) that is not highly conserved. From those oligonucleotides with a partially degenerate oriT core base sequence, the subpopulations that are bound by MobA, cleaved and rejoined by this protein and support termination of transfer were identified. Both the IR and the adjacent core bases TAA, are needed for tight binding to MobA, whereas the location of the dinucleotide YG determines the site of strand cleavage. At the IR MobA stabilizes duplex DNA during gel electrophoresis and binds weakly to oligonucleotides lacking the outer arm of the inverted repeat, supporting a model where secondary structure at IR provides a duplex region needed for binding during termination (Zhang and Meyer 1995). Significantly altered IR sequences did allow strong binding to MobA yet completely different IR sequences did not, indicating the IR serves a structural role for binding with low base specificity. A 184 residue aminoterminal MobA fragment capable of binding and cleaving oriT was identified by using phage display and partial enzymatic digestion of the protein. No smaller fragments that could bind or cleave oriT were identified. An active nucleoprotein intermediate consisting of MobA covalently linked to the 5' end of the cleaved oriT was used to show that a single molecule of MobA is sufficient to carry out all the DNA processing steps during transfer. / text

Thesis (MAppSc) -- University of South Australia, 1992

Thesis (Ph.D.) -- University of Adelaide, Dept. of Microbiology, 1974. / Reprints to two articles published by the author held in pocket in back of publication.

Thesis (Ph.D.)--University of Adelaide, Dept. of Physics and Mathematical Physics, 2001. / Includes bibliographical references (leaves 205-227).

Aziridines, three membered heterocycles containing a nitrogen in the ring, are extremely valuable to synthetic organic chemistry, as subjecting these compounds to ring opening processes initiates further capabilities for the molecule. Additionally, aziridines themselves possess the capacity and characteristics suitable for pharmaceutical applications, increasing the interest and appeal for their synthesis. One of the approaches to the formation of these products is the aza-Darzens reaction between imines and brominated nucleophiles. The research presented here aims to analyze this technique, specifically between tert-butanesulfinimines and methyl (E)-4-bromo-3-methylbut-2-enoate. Within the context of the reaction mechanism, the pivotal step involves nitrogen on a sulfinimine enolate bonding to the gamma carbon of the nucleophile, effectively cleaving bromine and producing an aziridine. Investigation into the development of the aforementioned imines and nucleophile is also accomplished in this undertaking.

No description available.

The syntheses of new classes of conjugated polymers are presented. The synthesis of novel alkyne bridged trispyrazolylmethane ligands, their coordination behavior and their crystallographic properties are studied. A series of functionalized poly(paraphenyleneethynylene)s, PPEs, are produced by click chemistry with post and pre-polymerization. Unpredictable solid-state polymerizations of defect free conjugated polythiophenes are investigated. Finally, by click chemistry aromatic diazides and aromatic diynes are coupled to produce a library of 1,2,3-triazoles and new conjugated polymers, poly(arylenetriazoline)s.

Thesis (Ph. D.)--University of California, San Diego, and San Diego State University, 2004. / Vita. Includes bibliographical references.