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Phosphinimines as potential technetium environmental sensors
(University of Missouri--Columbia, 2007)
Phosphinimines, R₃P=NSiMe₃, undergo hydrolysis to form the phosphiniminiumcation, R₃P=NH₂+, which forms the ion pair [R₃P=NH₂+][X-] in the presence of an anion.Preliminary studies show that in the presence of TcO₄-, ...
Purification and characterization of A[beta] and probing the interactions between myricetin and A[beta] using various spectroscopic methods
(University of Missouri--Columbia, 2009)
[beta] fragments, A[beta](1-16) and A[beta](25-40), together with A[beta](1-42) were investigated. HPLC purification was conducted on crude A[beta](1-16) and A[beta](25-40) using a Beckman System Gold HPLC system, a Vydac C18 column and a combination...
Determination of total selenium and seleno-amino acids in yeast and aquatic organisms by liquid chromatography and inductively coupled plasma mass spectrometry
(University of Missouri--Columbia, 2007)
The primary goal of this dissertation research was to develop methods for routine speciation analysis of selenium in tissues. A method for total selenium using on-line stable isotope dilution analysis with conventional ...
Inactivation of protein tyrosine phosphatases by endogenous and dietary agents
(University of Missouri--Columbia, 2009)
Protein tyrosine phosphatases are a class of enzymes that control a number of critical signaling pathways inside cells. We have discovered a number of dietary and endogenous agents that are capable of modifying these ...
Synthesis of silyloxyacrolein for [4+3] cycloaddition and preparation of carbonate closomer
(University of Missouri--Columbia, 2008)
[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT AUTHOR'S REQUEST.] Followed by Funk's method, I synthesized silyloxyacroleins and used them as dienophiles to react with different dienes in [4+3] cycloaddition reaction. ...
The effects of structural modifications on sigma receptor binding
(University of Missouri--Columbia, 2007)
The sigma receptor is a unique receptor family that has two subtypes: sigma1 and sigma2. Sigma1 receptors are involved in several physiological functions such as psychosis and depression. Sigma2 receptors are expressed in ...
Structural supramolecular constructs of spheres and tubes
(University of Missouri--Columbia, 2006)
This thesis examines four different molecular systems that are in part or substrates for larger structural motifs that resemble spheres or tubes. The first project used donut shaped cucurbituril and through functionalization ...
Anisotropic organic materials : ferroelectric crystals and spin-polarized radicals
(University of Missouri--Columbia, 2007)
[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT REQUEST OF AUTHOR.] Anisotropic organic materials are attracting increasing interesting for their highly electro-optic characteristics. We are especially interested in ...
Aza-analogues of distyrylbenzene (DSB) synthesis, structures, and properties of 1,4-phenylenediamine bisimines (PDABI)
(University of Missouri--Columbia, 2006)
[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT AUTHOR'S REQUEST.] The drive for electo-optically active materials was officially initiated in 1966 with the publishing, by NASA, of a 137 page report. The "Electro-optic ...
Investigations into the chemistry of protein tyrosine phosphatase redox regulation
(University of Missouri--Columbia, 2009)
Transmission of complex intracellular signals, such as those for glucose uptake or proliferation, is often accomplished through the reversible phosphorylation of specific protein tyrosine residues. This reversible ...
Organo nickel and platinum chemistry at the edge of corannulene
(University of Missouri--Columbia, 2007)
of �ML[subscript 2]� (M = Ni, Pt) with tetrabromocorannulene (C[subscript 20]H[subscript 6]Br[subscript 4]) and well- isolated by the column chromatography. The corresponding bowl-to-bowl inversion barriers are evaluated by NMR experiments in the range...
Deantiaromatization as a driving force in an electrocyclization of cyclopentadienone and the total synthesis of 1-epi-esco-pseudopteroxazole
(University of Missouri--Columbia, 2007)
Deantiaromatization has been successfully demonstrated as a driving force in an electrocyclization of cyclopentadienones. The reaction was found to be general for a number of substrates and provides a unique way to access ...
Spectroscopic investigations of the beta-amyloid peptide
(University of Missouri--Columbia, 2008)
The focus of this project is two-fold: examining the native structures of three different fragments of the beta-amyloid (A[beta]) peptide, and attempting to overcome some of the difficulties encountered in such an examination. ...
Investigation of the replacement of cysteine residues in DOTA-(Tyr³)-octreotate: synthesis, characterization and evaluation of biological activities
(University of Missouri--Columbia, 2006)
Modification of the peptide sequence of DOTA-Tyr³-octreotate is carried out by substituting the cysteine moieties with D-Cysteine, L-Penicillamine and D-Penicillamine in one or both positions to study the effect of this ...
Studies of the chemistry of Tröger's base, cyclopentadienones, and 2,1-benzothiazines
(University of Missouri--Columbia, 2006)
[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT AUTHOR'S REQUEST.] The sequential alkylation of Tröger's base was developed for the synthesis of symmetric dialkylation analogs. The products from this reaction were ...
Study of the chemistry of 2,1-benzothiazines and toward the total synthesis of elisapterosin B
(University of Missouri--Columbia, 2009)
[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT REQUEST OF AUTHOR.] Using enantiomerically pure benzothiazines as templates, enantiomerically pure cyclobutanes were prepared. Such compounds are potentially interesting ...
Metabolically activated heterocyclic N-oxide compounds for killing and visualizing hypoxic cancer cells
(University of Missouri--Columbia, 2009)
Tirapazamine (TPZ) is currently undergoing a variety of phase I, II, and III clinical trials for the treatment of various human cancers. TPZ derives its medicinal activity by inducing DNA damage in poorly oxygenated tumor ...
Synthesis and evaluation of 105Rhodium(III) complexes derived from diaminodithioether (DADTE) ligands
(University of Missouri--Columbia, 2006)
Seven analogoues of tetradentate acyclic diaminodithioether (DADTE)ligands were synthesized and characterized. R₂SC(R₁)₂)CHnN(CH₂)mNCHn((R₁)₂C)SR₂ 222-gdm (L3): m = 1, n = 1, R₁ = -CH₃ and R₂ = -H; 222-gdm-pmBz (L4): m = ...
Structure and synthesis of four supramolecular structures involving Cu(I) and 4,7-phenanthroline
(University of Missouri--Columbia, 2007)
The design and synthesis of supramolecular species with discrete geometric shapes has been an area of much interest and research in recent years. Three isolated species of square shaped molecules and one infinite network ...
Novel chemical mechanisms of DNA damage by natural products
(University of Missouri--Columbia, 2007)
[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT REQUEST OF AUTHOR.] Leinamycin is a structurally novel natural product isolated from the Streptomyces with potent antitumor and antibiotic activity. In a thiol rich ...