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Full-Text Articles in Physical Sciences and Mathematics
Applications Of A Diode-Laser-Based Detector To On-Line Determinations Involving Methylene Blue, Michelle Ann Spaziani
Applications Of A Diode-Laser-Based Detector To On-Line Determinations Involving Methylene Blue, Michelle Ann Spaziani
Honors Theses
The application of an inexpensive diode-laser-based detector for flow injection analysis (FIA), and the on-line determination of sulfide using the "Methylene Blue (MB) Method" is presented. The detector is designed for simultaneous measurements of transmittance and fluorescence. A 670-nm diode laser is the excitation source; photodiodes serve as detector elements. The flow cell is constructed of a piece of square-cross-section quartz capillary tubing. The MB Method employs N, N-dimethyl-p-phenylenediamine (DMPD), iron III, and sodium sulfide reacting to form MB; a triple-line flow-injection manifold is used. Performed previously using conventional UV-Vis instrumentation, optimized conditions included one reagent dissolved in 9 M …
Studies Toward A Chiral, Charge Separated, Water Soluble Cyclophane, Danuta Trzebinska-Yager
Studies Toward A Chiral, Charge Separated, Water Soluble Cyclophane, Danuta Trzebinska-Yager
Honors Theses
It has been suggested that the key issue in the structure-function correlation in enzyme catalysis is electrostatic stabilization of the ionic transition states. In order to mimic receptors in biological systems we designed a novel hydrophilic macrocycle, 10, with an electrostatic dipole across its hydrophobic cavity. The dipole moment would be established between a positively charged Fe(II)-terpyridyl complex on one end of the macrocycle and the two carboxylate substituents at the opposite end of the receptor. An experimental strategy based on a convergent synthesis is presented.
Fluorescence Studies Of Cyclodextrin Polymers: A Study Of The Binding Of Various Fluorescence Probes To Cyclodextrin Polymers, Karen Ann Colwell
Fluorescence Studies Of Cyclodextrin Polymers: A Study Of The Binding Of Various Fluorescence Probes To Cyclodextrin Polymers, Karen Ann Colwell
Honors Theses
Cyclodextrins (CDs) are cyclical oligosaccarides which exist as 6, 7, or 8 glucopyranose units joined by α-1,4 linkages, referred to as α, β, and γ CDs, respectively. Their structure resembles that of a truncated cone in which the interior cavity is hydrophobic while the exterior remains hydrophilic. This allows CDs to form inclusion complexes with nonpolar molecules in an aqueous environment. Polymerization of CDs (CDPs) has been carried out using epichlorohydrin which connects the CD cavities by an average of 12-15 repeating glyceryl linker units. The binding of various fluorescence probes to CD monomers has been studied. In particular, pyrene …
Influence Of Salt Bridge Formation On Helix Stability, Angelo Carmine Nicoletta
Influence Of Salt Bridge Formation On Helix Stability, Angelo Carmine Nicoletta
Honors Theses
One of the most common structural elements in proteins is the a-helix. The main goal of this study was to see If the helical properties of short peptide chains could be increased by the formation of salt bridges between side chains. It has been shown that i,i+4 peptides posses helic; I characier. The research that has been done was to make a hybrid peptide chain, that had partial i,i+4 and partial i,i+3 salt bridge formation. The hybrid peptide was a i+4, i+3, i+4 peptide chain. The overall purpose of making this type of hybrid peptide was to make the approximate …