http://hdl.handle.net/10057/397 Search the Channel s http://soar.wichita.edu:8080/dspace/simple-search http://hdl.handle.net/10057/1407 title: Design and studies of a self-assembled cofacial zinc phthalocyanine dimer complexed with fullerene(s) authors: Maligaspe, Eranda; D'Souza, Francis <br>abstract: Biomimetic bacterial photosynthetic reaction center complexes have been constructed using welldefined self-assembled supramolecular approaches. The “special pair” donor, a cofacial phthalocyanine dimer, was formed via potassium ion induced dimerization of tetra-(benzo-[15]crown-5) phthalocyanine. The dimer was subsequently self-assembled with functionalized fullerene(s) via axial coordination. The utilization of such welldefined multiple modes of binding in a controlled fashion results in the formation biomimetic supramolecualr complexes which further allows to probe the photoinduced charge separation. These complexes were fully characterized using 1H NMR, UV-Vis, electrochemical and mass spectrometric methods. The evidence for interaction in the ground state systems was obtained from spectroscopic and computational studies. Electron transfer from the excited zinc phthalocyanine to fullerene was reveled by steady and time-resolved emission studies. <br>description: Paper presented to the 4th Annual Symposium on Graduate Research and Scholarly Projects (GRASP) held at the Hughes Metropolitan Complex, Wichita State University, April 25, 2008. <br> Thu, 24 Apr 2008 22:58:59 GMT http://hdl.handle.net/10057/1403 title: Transport of tryptophan into SH-SY5Y neuronal cells authors: Kollalpitiya, Yamuna; Wimalasena, Kandatage <br>abstract: The human neuroblastoma cell line SH-SY5Y is a commonly used catecholaminergic model in studies related to neurotoxicity of various substances, oxidative stress, and neurodegenerative diseases. Specific transport of monoamine neurotransmitter precursors i.e. corresponding aromatic amino acids, into these cells is essential for cellular metabolism. Serotonin (5-hydroxytryptamine) is a neurotransmitter synthesized in the brain that is implicated in many brain disorders including Schizophrenia and manic depression. Serotonin is synthesized from tryptophan in serotonergic neurons. In the present study we have examined the uptake of L-tryptophan into SH-SY5Y cells by reverse phase high performance liquid chromatography coupled with UV detection. This study shows that SH-SY5Y cells possess significant capacity to take up extracellular tryptophan. The tryptophan uptake was inhibited by a specific inhibitor of system L, a transport system present in mammalian cells serves for neutral amino acids, providing evidence that tryptophan enters the cells via transport system L. Both undifferentiated and 12-O-tetradecanoly-phorbol-12-acetate (TPA) differentiated SH-SY5Y cells show similar tryptophan uptake efficiencies. <br>description: Paper presented to the 4th Annual Symposium on Graduate Research and Scholarly Projects (GRASP) held at the Hughes Metropolitan Complex, Wichita State University, April 25, 2008. <br> Thu, 24 Apr 2008 22:58:59 GMT http://hdl.handle.net/10057/1348 title: Evaluation of the cure state and water content at carn fiber containing composite surfaces authors: Gandikota, Rama; Alcalen, Irish; Hall, Sarah; Stevenson, William T.K. <br>abstract: A technique called ‘Near Infrared diffuse reflectance spectroscopy’ is able to monitor the moisture content in resin rich fiber reinforced composite surfaces and the cure state of resin at the surface of a resin rich fiber reinforced composite. Measurement of water in composites made from 934 resin and T300 fibers was addressed using both normalized absorption spectroscopy and using a “Chemometrics” second derivative partial least squares spectrum analysis. (Chemometrics is the procedure of relating measurements made on a chemical system via application of mathematical or statistical methods). We will show that interpretation of a diffuse reflectance near IR spectrum is more complex than interpretation of a transmission near IR Spectrum, with the result that a partial least squares (Chemometrics) analysis gives better results than a straightforward normalized Beer type plot. Calibration curves have been produced to relate diffuse reflectance near IR spectra to water content for uptake and desorption of water in medium and high performance epoxy resins, high performance adhesives, and carbon fiber reinforced composites. Calibration curves have also been produced to relate the near IR diffuse reflectance spectrum to cure state in high performance adhesives and carbon fiber reinforced composites. <br>description: Paper presented to the 4th Annual Symposium on Graduate Research and Scholarly Projects (GRASP) held at the Hughes Metropolitan Complex, Wichita State University, April 25, 2008. <br> Thu, 24 Apr 2008 22:58:59 GMT http://hdl.handle.net/10057/1340 title: Recent advances in cyanoscorpionate chemistry: complexes with CO(II), MN(II), and NI(II)(cyclam) authors: Bullinger, John C.; Moore, Curtis Eugene; Eichhorn, David M. <br>abstract: In the past, electronic and magnetic materials have been atom based materials made up of metals or metal-oxides. Functionally,these atom based materials are extremely efficient, however, they are very expensive to synthesize, very heavy, and possess limited flexibility. These properties limit the applications of traditional atom based materials where expense, weight, and flexibility are issues. Molecule based materials contain individual molecules which are inexpensively synthesized and made from predominantly light weight carbon, hydrogen, nitrogen, and oxygen. Coordination polymers containing transition metal centers with organic ligands can provide both electronic and magnetic properties as well as allow for light-weight and flexible molecule based materials. We have been investigating the synthesis of cyanoscorpionate ligands as components of coordination polymers. Over the last several years, our group has been investigating trispyrazolylborate (Tp) ligands containing the CN substituent in the 4-position of the pyrazole ring. The cyano group has a strong electronwithdrawing character, as well as the ability to coordinate to the metal. This allows the scorpionate to form various coordination polymers in which two cyanoscorpionate complexes are bound to the metal ion through the cyano group. In this paper we present recent work in this field, including the synthesis and structural characterization of complexes in which the cyano groups are coordinated to a central metal atom. These complexes represent the first step towards the synthesis of two-component coordination polymers involving this ligand class. <br>description: Paper presented to the 4th Annual Symposium on Graduate Research and Scholarly Projects (GRASP) held at the Hughes Metropolitan Complex, Wichita State University, April 25, 2008. <br> Thu, 24 Apr 2008 22:58:59 GMT