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SYNTHESIS OF SPECTROSCOPIC REACTION MODELS FOR ELECTRON TRANSFER STUDIES BETWEEN NADH AND FAD
Title
SYNTHESIS OF SPECTROSCOPIC REACTION MODELS FOR ELECTRON TRANSFER STUDIES BETWEEN NADH AND FAD.
Creator
SALINAS, JORGE ENRIQUE., Florida Atlantic University
Abstract/Description
In an effort to gain detailed insight into the mechanism of electron transport in the respiratory chain, the synthesis of a reaction model approximating the first step of the sequence was attempted. The desired molecule should contain the isoalloxazine ring system, the reactive center of flavin adenine dinucleotide, and the nicotinamide ring, the reactive moiety of nicotinamide adenine dinucleotide, joined by a trimethylene bridge. The successful synthesis and characterization of many...
Show moreIn an effort to gain detailed insight into the mechanism of electron transport in the respiratory chain, the synthesis of a reaction model approximating the first step of the sequence was attempted. The desired molecule should contain the isoalloxazine ring system, the reactive center of flavin adenine dinucleotide, and the nicotinamide ring, the reactive moiety of nicotinamide adenine dinucleotide, joined by a trimethylene bridge. The successful synthesis and characterization of many intermediate confirms that the procedure being used is viable. Attainment of the actual reaction model, based on the work described herein, should occur in the near future.
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Date Issued
1975
PURL
http://purl.flvc.org/fcla/dt/13741
Subject Headings
Electron spectroscopy
Format
Document (PDF)
Electronic energy levels of some tetragonal copper ion and chromium ion complexes
Title
Electronic energy levels of some tetragonal copper ion and chromium ion complexes.
Creator
Davari, Mortaza., Florida Atlantic University, Perumareddi, Jayarama R.
Abstract/Description
The electronic spectrum of Cu(II)(L-His)2 has been measured in the visible-near IR and UV regions. By assigning ligand field bands and by fitting the band maxima with calculated energies using angular overlap model, the structure of the complex has been deduced to be five-coordinate C4v1 The observed bands in the UV spectrum have been assigned as due to ligand-to-metal charge transfer transitions. Electronic spectra of Cu(II)(diphenylcarbazide)2 and Cr(II)(diphenylcarbazone)(H2O)4 complexes...
Show moreThe electronic spectrum of Cu(II)(L-His)2 has been measured in the visible-near IR and UV regions. By assigning ligand field bands and by fitting the band maxima with calculated energies using angular overlap model, the structure of the complex has been deduced to be five-coordinate C4v1 The observed bands in the UV spectrum have been assigned as due to ligand-to-metal charge transfer transitions. Electronic spectra of Cu(II)(diphenylcarbazide)2 and Cr(II)(diphenylcarbazone)(H2O)4 complexes have also been measured. By interpretation of the ligand field bands in these spectra, tentative structures of these complexes in solution have been proposed.
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Date Issued
1996
PURL
http://purl.flvc.org/fcla/dt/15318
Subject Headings
Copper compounds, Chromium compounds, Electron spectroscopy
Format
Document (PDF)
Determination of the acid dissociation constant of cytochrome B5 reductase
Title
Determination of the acid dissociation constant of cytochrome B5 reductase.
Creator
Chong, Samantha., Harriet L. Wilkes Honors College
Abstract/Description
Most living organisms transduce electron transport chains in order to obtain energy. Flavin adenine dinucleotide (FAD) is a common electron transfer cofactor found in electron transport proteins referred to as flavoproteins. In this study, the different ionization and oxidation states of this cofactor found in cytochrome b5 reductase were identified spectroscopically and quantified as a function of solution potential and pH. The large data sets obtained from these experiments were analyzed...
Show moreMost living organisms transduce electron transport chains in order to obtain energy. Flavin adenine dinucleotide (FAD) is a common electron transfer cofactor found in electron transport proteins referred to as flavoproteins. In this study, the different ionization and oxidation states of this cofactor found in cytochrome b5 reductase were identified spectroscopically and quantified as a function of solution potential and pH. The large data sets obtained from these experiments were analyzed and the acid dissociation constant for reduced cytochrome b5 reductase was determined.
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Date Issued
2008
PURL
http://purl.flvc.org/FAU/77662
Subject Headings
Cell metabolism, Cellular signal transduction, Chemistry, Statistical methods, Electron spectroscopy
Format
Document (PDF)
Biological electron transfer
Title
Biological electron transfer: an investigation of riboflavin.
Creator
Caplan, Stacee Lee, Harriet L. Wilkes Honors College
Abstract/Description
Most living organisms utilize electron transport chains in order to obtain energy. Riboflavin, commonly known as vitamin B2, is the central component of the redox coenzymes flavin adenine dinucleotide (FAD) and flavin mononucleotide (FMN). These cofactors serve as a prosthetic group to flavoproteins and function as the energy-carrying molecules in electron transfer reactions. In this study, the different ionization and oxidation states of riboflavin were identified and quantified as a...
Show moreMost living organisms utilize electron transport chains in order to obtain energy. Riboflavin, commonly known as vitamin B2, is the central component of the redox coenzymes flavin adenine dinucleotide (FAD) and flavin mononucleotide (FMN). These cofactors serve as a prosthetic group to flavoproteins and function as the energy-carrying molecules in electron transfer reactions. In this study, the different ionization and oxidation states of riboflavin were identified and quantified as a function of solution potential and pH. To accomplish this task, spectroelectrochemical reductions of riboflavin at different pH were performed. Spectroscopic data offer clues concerning the identity of underlying species, such as oxidation/ionization states and the controlling equilibria. The large data sets obtained from these experiments were analyzed and the acid dissociation constant for reduced riboflavin was determined.
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Date Issued
2008
PURL
http://purl.flvc.org/FAU/77660
Subject Headings
Solution (Chemistry), Electron spectroscopy, Chemical reaction, Conditions and laws of, Charge transfer in biology
Format
Document (PDF)
experimental study of LEED and UPS on bombarded and vacuum cleaved zinc(0001) surfaces
Title
An experimental study of LEED and UPS on bombarded and vacuum cleaved zinc(0001) surfaces.
Creator
Liu, Yu, Florida Atlantic University, Jordan, Robin G., Qiu, Shen-Li
Abstract/Description
Several Zn single crystals were grown by the Bridgman method and their orientations were determined by the Laue X-ray back-reflection method. Zn(0001) surfaces were prepared by vacuum cleaving and by Ar+ bombardment with annealing. LEED patterns and UPS spectra were taken on both the cleaved and bombarded Zn(0001) surfaces. The LEED patterns from cleaved surfaces showed 6-fold symmetry whereas those from bombarded surfaces showed a hexagonal array but with some differences: the spots with the...
Show moreSeveral Zn single crystals were grown by the Bridgman method and their orientations were determined by the Laue X-ray back-reflection method. Zn(0001) surfaces were prepared by vacuum cleaving and by Ar+ bombardment with annealing. LEED patterns and UPS spectra were taken on both the cleaved and bombarded Zn(0001) surfaces. The LEED patterns from cleaved surfaces showed 6-fold symmetry whereas those from bombarded surfaces showed a hexagonal array but with some differences: the spots with the same distances from the center of LEED pattern had different intensities and they were dimmer and more blurry compared to those from the cleaved surface. A value of 2.64+-0.07 A for the nearest neighbor spacing was determined from the LEED patterns. The UPS spectra showed that for both types of surfaces the 3d peak is at 9.8 eV with a spin splitting of 0.7 eV, which are in agreement with previous experimental and theoretical results. Differences in spectra between the two types of surfaces were found in the ratios of signal/background and in the ratios of the 3d doublet.
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Date Issued
1996
PURL
http://purl.flvc.org/fcla/dt/15304
Subject Headings
Metal crystals, Engineering, Materials Science, Low energy electron diffraction, Photoelectron spectroscopy
Format
Document (PDF)