Current Search: Resonance (x)
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Title
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Nuclear magnetic resonance spectroscopic studies of metallocene (IVB) squarate polymers and other metallocene (IVB)-containing polymers.
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Creator
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Li, Alicia Qing, Florida Atlantic University, Carraher, Charles E., Charles E. Schmidt College of Science, Department of Chemistry and Biochemistry
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Abstract/Description
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Group IVB metallocene polymers and oligomers undergo a pi-sigma rearrangement of the cyclopentadienyl moieties in DMSO based on NMR data. The sigma-Cp rings are stereochemically rigid at room temperature.
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Date Issued
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1991
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PURL
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http://purl.flvc.org/fcla/dt/14681
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Subject Headings
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Organometallic polymers, Metallocenes, Nuclear magnetic resonance
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Format
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Document (PDF)
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Title
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Composition of aluminum phenylphosphonate solutions: Evidence from nuclear magnetic resonance.
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Creator
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Schulz, Hans-Erich., Florida Atlantic University, Haky, Jerome E.
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Abstract/Description
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27Al nuclear magnetic resonance (NMR) has been employed to study the structure of aqueous aluminum nitrate solutions in the presence of phenylphosphonic acid, potassium dihydrogen phosphate and phosphoric acid. Evidence has been obtained which indicates that in aqueous solution, aluminum ions can be complexed with phosphonate or phosphate in either a 1:1 or 2:1 molar ratio, respectively. The relative percentages of these complexes in solution are shown to be dependent on the ratio of aluminum...
Show more27Al nuclear magnetic resonance (NMR) has been employed to study the structure of aqueous aluminum nitrate solutions in the presence of phenylphosphonic acid, potassium dihydrogen phosphate and phosphoric acid. Evidence has been obtained which indicates that in aqueous solution, aluminum ions can be complexed with phosphonate or phosphate in either a 1:1 or 2:1 molar ratio, respectively. The relative percentages of these complexes in solution are shown to be dependent on the ratio of aluminum nitrate to phosphonate or phosphate as well as the degree of ionization of the phosphorus species.
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Date Issued
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1995
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PURL
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http://purl.flvc.org/fcla/dt/15232
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Subject Headings
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Nuclear magnetic resonance, Aluminum alloys--Bonding
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Format
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Document (PDF)
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Title
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THE CORPUS CALLOSUM OF INDIVIDUALS WITH MICROCEPHALY AN MRI STUDY.
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Creator
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Fishbein, Alyson, Ellis, Meredith, Florida Atlantic University, Dorothy F. Schmidt College of Arts and Letters, Department of Anthropology
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Abstract/Description
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Microcephaly is neurological condition within which the brain fails to develop to a normal size resulting in the appearance of a smaller head. Microcephaly often accompanies various neurodevelopmental disorders. The corpus callosum is the largest white matter structure in the brain, comprised primarily of heavily myelinated axons. The corpus callosum connects the left and right hemisphere and allows for communication to occur between hemispheres. Using MRI measurements from a sample of 18...
Show moreMicrocephaly is neurological condition within which the brain fails to develop to a normal size resulting in the appearance of a smaller head. Microcephaly often accompanies various neurodevelopmental disorders. The corpus callosum is the largest white matter structure in the brain, comprised primarily of heavily myelinated axons. The corpus callosum connects the left and right hemisphere and allows for communication to occur between hemispheres. Using MRI measurements from a sample of 18 microcephalic patients, I analyzed whether the corpus callosum was impacted as a result of microcephaly. When compared to normocephalic controls, the corpus callosum was generally smaller in relation to overall cerebral hemispheric volume, suggesting that white matter brain tissues may be affected by microcephaly. A deeper understanding of the brain through research on the underlying mechanisms responsible for brain evolution and development is critical to our ability to detect, treat and prevent neurodevelopmental, neurodegenerative and psychiatric disorders.
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Date Issued
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2019
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PURL
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http://purl.flvc.org/fau/fd/FA00013307
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Subject Headings
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Corpus callosum, Microcephaly, Magnetic resonance imaging
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Format
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Document (PDF)
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Title
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More kapakahines from the marine sponge Cribrochalina olemda.
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Creator
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Nakao, Y., Kuo, J., Yoshida, W. Y., Kelly-Borges, M., Scheuer, P. J., Harbor Branch Oceanographic Institute
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Date Issued
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2003
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PURL
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http://purl.flvc.org/FCLA/DT/3319108
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Subject Headings
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Sponges --Research, Cytotoxin, Nuclear magnetic resonance, Cyclic peptides
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Format
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Document (PDF)
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Title
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Influence of nitrogen availability on agar-polysaccharides from Gracilaria verrucosa strain G-16: structural analysis by NMR spectroscopy.
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Creator
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Chiles, Thomas C., Bird, Kimon T., Koehn, F. E., Harbor Branch Oceanographic Institute
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Date Issued
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1989
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PURL
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http://purl.flvc.org/FCLA/DT/3333140
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Subject Headings
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Gracilaria verrucosa, Agar, Polysaccharides, Nitrogen, Nuclear magnetic resonance spectroscopy
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Format
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Document (PDF)
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Title
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Dihydroxyaerothionin and aerophobin I. Two brominated tyrosine metabolites from the deep water marine sponge Verongula rigida.
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Creator
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Gunasekera, M., Harbor Branch Oceanographic Institute
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Date Issued
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1989
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PURL
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http://purl.flvc.org/FCLA/DT/3332958
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Subject Headings
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Sponges, Tyrosine, Demospongiae, Marine metabolites, Nuclear magnetic resonance spectroscopy
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Format
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Document (PDF)
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Title
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An advanced submersible handling system.
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Creator
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Clark, A. M., McCallum, R., Harbor Branch Oceanographic Institute
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Date Issued
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1985
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PURL
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http://purl.flvc.org/FCLA/DT/3183671
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Subject Headings
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Automatic control, Resonance, Oceanographic submersibles, Remote submersibles, Winches
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Format
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Document (PDF)
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Title
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White matter networks indicative of Alzheimer's disease from diffusion MRI.
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Creator
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Hahn, William E., Fuchs, Armin, Graduate College
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Date Issued
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2013-04-12
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PURL
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http://purl.flvc.org/fcla/dt/3361307
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Subject Headings
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Alzheimer's disease, Diffusion tensor imaging, Diffusion magnetic resonance imaging
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Format
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Document (PDF)
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Title
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Discorhabdins S, T, and U, New Cytotoxic Pyrroloiminoquinones from a Deep‐Water Caribbean Sponge of the Genus Batzella.
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Creator
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Gunasekera, Sarath P., Zuleta, Ignacio A., Longley, Ross E, Wright, Amy E., Pomponi, Shirley A.
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Date Issued
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2003
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PURL
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http://purl.flvc.org/FCLA/DT/3164103
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Subject Headings
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Sponges, Nuclear magnetic resonance spectroscopy, Antineoplastic agents, Mass spectrometry, Pharmacognosy
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Format
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Document (PDF)
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Title
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Acceleration charge sensitivity in AT-quartz resonators.
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Creator
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Anderson, Clifford L. H., Florida Atlantic University, Bagby, Jonathan S.
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Abstract/Description
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The behavior of AT-quartz resonators subject to acceleration is studied. For an AT strip resonator with cantilever mounting, piezoelectric theory predicts that excitation of the pure lowest frequency flexural mode of vibration generates no charge. However, experiments show electromechanical resonance corresponding to this mode for sinusoidal support motion normal to the plane of the crystal with no applied electric field. An amplifier with a voltage follower first stage senses charge output...
Show moreThe behavior of AT-quartz resonators subject to acceleration is studied. For an AT strip resonator with cantilever mounting, piezoelectric theory predicts that excitation of the pure lowest frequency flexural mode of vibration generates no charge. However, experiments show electromechanical resonance corresponding to this mode for sinusoidal support motion normal to the plane of the crystal with no applied electric field. An amplifier with a voltage follower first stage senses charge output from the crystal. Shielding is required to reduce sixty hertz and drive frequency electromagnetic interference. Measurement of resonant frequency and damping factor for the lowest frequency flexural mode is reported for a group of 17.76 MHz oscillator crystals. This mode is responsible for crystal breakage in some portable communications products. Significant variation in sensitivity among crystals was observed. Charge sensitivity of this mode is attributed in part to mechanical coupling to other modes involving torsion and lateral flexure.
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Date Issued
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1995
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PURL
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http://purl.flvc.org/fcla/dt/15126
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Subject Headings
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Quartz crystals, Piezoelectricity, Oscillators, Crystal, Resonators, Acceleration (Mechanics)
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Format
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Document (PDF)
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Title
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PHOSPHORUS SEQUESTRATION AND BIOREMEDIATION: PHOSPHORUS-31 NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY.
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Creator
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Duersch, Bobby G., Louda, J. William, Florida Atlantic University, Department of Chemistry and Biochemistry, Charles E. Schmidt College of Science
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Abstract/Description
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Eutrophication is an increase in primary plant nutrients (Nitrogen [N] and Phosphorus [P]) in oceans, estuaries and lakes. The consequences of eutrophication are harmful algal blooms (HABs), resulting in algal toxin production and the depletion of oxygen as the extensive biomass decays. P is often the limiting nutrient and is viewed as a significant environmental problem. Most of the excess P that enters aquatic ecosystems originates from anthropogenic sources such as fertilizers, sewage,...
Show moreEutrophication is an increase in primary plant nutrients (Nitrogen [N] and Phosphorus [P]) in oceans, estuaries and lakes. The consequences of eutrophication are harmful algal blooms (HABs), resulting in algal toxin production and the depletion of oxygen as the extensive biomass decays. P is often the limiting nutrient and is viewed as a significant environmental problem. Most of the excess P that enters aquatic ecosystems originates from anthropogenic sources such as fertilizers, sewage, animal wastes, compost, crop residues, and wastewater. Over time, one of the main reservoirs of P becomes organic P (Po). We investigated the chemical nature and dynamics of P in cyanobacteria, horse manure, stormwater treatment areas, and rice fields. To better understand the chemical nature of P, the identification of specific P compounds was required, which was achieved through 31P nuclear magnetic resonance (NMR) spectroscopy. We investigated how paramagnetic metals and quadrupolar nuclei cause severe line broadening, peak shifts, and decreased the signal to noise ratio. Results revealed that certain Po forms are readily bioavailable to Microcystis aeruginosa. Additionally, the potential heterotrophic use of the organic portion (e.g., glucose, glycerol) of these P compounds are indicated for the growth and persistence of Microcystis aeruginosa. We showed that the cultivation of rice (Oryza sativa L.) had been found to effectively reduce P from agrarian soil and water through plant uptake and, therefore, minimizing downstream eutrophication. Soil, water, sugarcane, and rice plants at two different stages were analyzed for twelve different elements. Finally, we examined how a “relic” agrarian ditch in Stormwater Treatment Area 1 East (STA-1E) can be used for the retention and sequestration of P and other nutrients. The STAs were established to capture P from agricultural and other sources before reaching the Everglades. Retained P is primarily stored in the wetland soils and sediments, generated through a collection of interrelated physical, chemical, and biological processes.
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Date Issued
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2020
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PURL
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http://purl.flvc.org/fau/fd/FA00013594
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Subject Headings
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Nuclear magnetic resonance spectroscopy, Eutrophication, Phosphorus--Environmental aspects, Bioremediation
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Format
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Document (PDF)
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Title
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Three-dimensional structure of the alpha-conotoxin EI determined by proton NMR spectroscopy.
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Creator
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Franco, Aldo, Florida Atlantic University, Mari, Frank
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Abstract/Description
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The alpha-conotoxin EI is an 18-residue peptide (RDOCCYHPTCNMSNPQIC; 4-10, 5-18) isolated from the venom of Conus ermineus. This peptide targets the nicotinic acetylcholine receptor (nAChR) found in mammalian skeletal muscle and the electric organ of Torpedo. 2D-NMR methods and dynamical simulated annealing protocols have been used to determine the 3D structure of EI. 133 NOE-derived distances were used to produce 13 structures with minimum energy that complied with the NOE restraints. The...
Show moreThe alpha-conotoxin EI is an 18-residue peptide (RDOCCYHPTCNMSNPQIC; 4-10, 5-18) isolated from the venom of Conus ermineus. This peptide targets the nicotinic acetylcholine receptor (nAChR) found in mammalian skeletal muscle and the electric organ of Torpedo. 2D-NMR methods and dynamical simulated annealing protocols have been used to determine the 3D structure of EI. 133 NOE-derived distances were used to produce 13 structures with minimum energy that complied with the NOE restraints. The structure of EI is characterized by a helical loop between T9 and M12 that is stabilized by the C4-C10 disulfide bond and turns involving C4-C5 and N14-P15. The overall fold of EI is similar to that of other alpha4/7 conotoxins (PnIA/B, MII, EpI). However, unlike these other alpha4/7 conotoxins, EI targets the muscular type nAChR. The differences in selectivity can be attributed to the surface charge distribution among these alpha4/7 conotoxins.
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Date Issued
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1998
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PURL
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http://purl.flvc.org/fcla/dt/15609
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Subject Headings
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Conus--Venom, Peptides--Structure, Nuclear magnetic resonance spectroscopy
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Format
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Document (PDF)
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Title
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Antimicrobial constituent of the brown alga Sporochnus pedunculatus.
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Creator
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Gunasekera, L. S., Wright, Amy E., Gunasekera, Sarath P., McCarthy, Peter J., Reed, John K.
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Date Issued
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1995
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PURL
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http://purl.flvc.org/fau/fd/FA00007231
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Subject Headings
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Brown algae, Antimicrobial agents, Nuclear magnetic resonance, Candida albicans, Bacillus subtilis
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Format
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Document (PDF)
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Title
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Leiodermatolide, a potent antimitotic macrolide from the marine sponge Leiodermatium sp.
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Creator
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Paterson, Ian, Dalby, S. M., Roberts, J. C., Naylor, G. J., Guzman, Esther A., Isbrucker, Richard A., Pitts, Tara P., Linley, P. A., Divlianska, D. B., Reed, John K., Wright, Amy E.
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Date Issued
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2011
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PURL
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http://purl.flvc.org/fau/fd/FA00007465
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Subject Headings
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Antimitotic Agents, Macrolides, Sponges, Molecular structure, Nuclear Magnetic Resonance, Biomolecular, Cell lines
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Format
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Document (PDF)
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Title
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Revised stereochemistry for the structures of eudistomins C, K, E, F and L.
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Creator
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Blunt, J. W., Lake, R. J., Munro, M. H. G., Harbor Branch Oceanographic Institute
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Date Issued
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1987
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PURL
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http://purl.flvc.org/FCLA/DT/3353801
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Subject Headings
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Carbolines, Stereochemistry, Ascidians, Nuclear magnetic resonance spectroscopy, Sea urchins--New Zealand
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Format
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Document (PDF)
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Title
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Plakolide A, a New γ‐Lactone from the Marine Sponge Plakortis sp.
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Creator
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Gunasekera, Sarath P., Isbrucker, Richard A., Longley, Ross E., Wright, Amy E., Pomponi, Shirley A., Reed, John K.
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Date Issued
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2004
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PURL
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http://purl.flvc.org/FCLA/DT/3164104
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Subject Headings
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Sponges, Lactones, Acids, Nitric-oxide synthase, Nuclear magnetic resonance spectroscopy
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Format
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Document (PDF)
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Title
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A COMPARISON OF TASK RELEVANT NODE IDENTIFICATION TECHNIQUES AND THEIR IMPACT ON NETWORK INFERENCES: GROUP-AGGREGATED, SUBJECT-SPECIFIC, AND VOXEL WISE APPROACHES.
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Creator
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Falco, Dimitri, Bressler, Steven L., Florida Atlantic University, Center for Complex Systems and Brain Sciences, Charles E. Schmidt College of Science
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Abstract/Description
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The dissertation discusses various node identification techniques as well as their downstream effects on network characteristics using task-activated fMRI data from two working memory paradigms: a verbal n-back task and a visual n-back task. The three node identification techniques examined within this work include: a group-aggregated approach, a subject-specific approach, and a voxel wise approach. The first chapters highlight crucial differences between group-aggregated and subject-specific...
Show moreThe dissertation discusses various node identification techniques as well as their downstream effects on network characteristics using task-activated fMRI data from two working memory paradigms: a verbal n-back task and a visual n-back task. The three node identification techniques examined within this work include: a group-aggregated approach, a subject-specific approach, and a voxel wise approach. The first chapters highlight crucial differences between group-aggregated and subject-specific methods of isolating nodes prior to undirected functional connectivity analysis. Results show that the two techniques yield significantly different network interactions and local network characteristics, despite having their network nodes restricted to the same anatomical regions. Prior to the introduction of the third technique, a chapter is dedicated to explaining the differences between a priori approaches (like the previously introduced group-aggregated and subject-specific techniques) and no a priori approaches (like the voxel wise approach). The chapter also discusses two ways to aggregate signal for node representation within a network: using the signal from a single voxel or aggregating signal across a group of neighboring voxels. Subsequently, a chapter is dedicated to introducing a novel processing pipeline which uses a data driven voxel wise approach to identify network nodes. The novel pipeline defines nodes using spatial temporal features generated by a deep learning algorithm and is validated by an analysis showing that the isolated nodes are condition and subject specific. The dissertation concludes by summarizing the main takeaways from each of the three analyses as well as highlighting the advantages and disadvantages of each of the three node identification techniques.
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Date Issued
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2020
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PURL
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http://purl.flvc.org/fau/fd/FA00013553
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Subject Headings
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Functional magnetic resonance imaging, Brain mapping, Working memory, Neural networks (Neurobiology), Neuroimaging--methods
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Format
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Document (PDF)
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Title
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Diffusion tensor imaging in mild traumatic brain injuries.
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Creator
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Hotiu, Angelica, Charles E. Schmidt College of Science, Department of Physics
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Abstract/Description
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Mild traumatic brain injuries (MTBI) are the leading type of head injuries with appreciable risque of sequelae leading to functional and psychological deficits. Although mild traumatic brain injuries are frequently underdiagnosed by conventional imaging modalities, rapidly evolving techniques such as diffusion tensor imaging (DTI) reveal subtle changes in white matter integrity as a result of head trauma and play an important role in refining diagnosis, therapeutic interventions and...
Show moreMild traumatic brain injuries (MTBI) are the leading type of head injuries with appreciable risque of sequelae leading to functional and psychological deficits. Although mild traumatic brain injuries are frequently underdiagnosed by conventional imaging modalities, rapidly evolving techniques such as diffusion tensor imaging (DTI) reveal subtle changes in white matter integrity as a result of head trauma and play an important role in refining diagnosis, therapeutic interventions and management of MTBI. In this dissertation we use diffusion tensor imaging to detect the microstructural changes induced by axonal injuries and to monitor their evolution during the recovery process. DTI data were previously acquired from 11 subjects, football players of age 19-23 years (median age 20 years). Three players had suffered a mild traumatic brain injury during the season and underwent scanning within 24 hours after the injury with follow-ups after one and two weeks. A set of diffusion indices, such as fractional anisotropy, axial, radial and mean diffusivity were derived from the diffusion tensor. Changes in diffusion indices in concussed subjects were analyzed based on two different approaches: whole brain analysis, using tract-based spatial statistics (TBSS) and region of interest analysis (ROI). In both approaches we use a voxelwise analysis to examine group differences in diffusion indices between five controls and three concussed subjects for all DTI scans. Additional statistical analysis was performed between control groups consisting of five and three non-injured players. Both analyses demonstrated that the MTBI group reveals increase in fractional anisotropy and decreases in transversal and mean diffusivity in cortical and subcortical areas within 24 hours after the injury., No changes were detected in TBSS analysis for the follow-up data sets. Furthermore, our ROI approach revealed multiples regions with significantly different voxels, non-uniformly distributed throughout the brain, for all diffusion indices in all three scans. Three of the diffusion indices fractional anisotropy, mean and transversal diffusivity showed higher vulnerability to head trauma in subcortical and cortical areas than in regions in the lower brain. Recovery of white matter pathways occured at different locations in the brain at one and two weeks after head trauma. Strong recovery was observed in mean and transversal diffusivity in subcortical areas that correspond to the corticospinal tract. No recovery was found for fractional anisotropy and axial diffusivity in the same region. Also, decreases in fractional anisotropy and increases in transversal and axial diffusivity were observed in the spleninum of the corpus callosum. As voxelwise analysis performed on DTI data revealed white matter regions, which exhibit changes in diffusion parameters in the concussed group for all three scans, we conclude that diffusion tensor imaging is a powerful technique for early detection of axonal injuries and may serve as an important tool for monitoring microstructural changes during the recovery process.
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Date Issued
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2010
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PURL
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http://purl.flvc.org/FAU/2100579
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Subject Headings
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Brain, Magnetic resonance imaging, Brain, Concussion, Diagnosis, Neuropsychology, Diffusion tensor imaging
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Format
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Document (PDF)
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Title
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Investigation of human visual spatial attention with fMRI and Granger Causality analysis.
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Creator
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Tang, Wei, Charles E. Schmidt College of Science, Center for Complex Systems and Brain Sciences
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Abstract/Description
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Contemporary understanding of human visual spatial attention rests on the hypothesis of a top-down control sending from cortical regions carrying higher-level functions to sensory regions. Evidence has been gathered through functional Magnetic Resonance Imaging (fMRI) experiments. The Frontal Eye Field (FEF) and IntraParietal Sulcus (IPS) are candidates proposed to form the frontoparietal attention network for top-down control. In this work we examined the influence patterns between...
Show moreContemporary understanding of human visual spatial attention rests on the hypothesis of a top-down control sending from cortical regions carrying higher-level functions to sensory regions. Evidence has been gathered through functional Magnetic Resonance Imaging (fMRI) experiments. The Frontal Eye Field (FEF) and IntraParietal Sulcus (IPS) are candidates proposed to form the frontoparietal attention network for top-down control. In this work we examined the influence patterns between frontoparietal network and Visual Occipital Cortex (VOC) using a statistical measure, Granger Causality (GC), with fMRI data acquired from subjects participated in a covert attention task. We found a directional asymmetry in GC between FEF/IPS and VOC, and further identified retinotopically specific control patterns in top-down GC. This work may lead to deeper understanding of goal-directed attention, as well as the application of GC to analyzing higher-level cognitive functions in healthy functioning human brain.
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Date Issued
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2011
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PURL
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http://purl.flvc.org/FAU/3334101
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Subject Headings
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Attention, Physiological aspects, Cognitive neuroscience, Brain, Magnetic resonance imaging, Sensorimotor integration, Movement sequences, Human information processing, Cognitive psychology, Visual perception, Testing
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Format
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Document (PDF)
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Title
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The effect of age on processing family, famous and novel faces: An fMRI study.
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Creator
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Jones, Lana Casey, Florida Atlantic University, Tuller, Betty, Charles E. Schmidt College of Science, Department of Psychology
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Abstract/Description
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Facial recognition memory is a specialized system in the human brain, with an effect of familiarity playing a role in the brain activations involved. Previous studies examining the familiar face processing system have used college-aged subjects. However, memory disorders, like those associated with Alzheimer's disease, typically affect adults over sixty. In an attempt to reveal possible differences between young and older adults', two different age groups were subjected to fMRI analysis while...
Show moreFacial recognition memory is a specialized system in the human brain, with an effect of familiarity playing a role in the brain activations involved. Previous studies examining the familiar face processing system have used college-aged subjects. However, memory disorders, like those associated with Alzheimer's disease, typically affect adults over sixty. In an attempt to reveal possible differences between young and older adults', two different age groups were subjected to fMRI analysis while viewing face images with varying familiarity (family, famous and novel). The result showed a significant difference in activations for various cortical areas including the precuneus, cingulate cortex, and fusiform gyrus. Among the differences, an overall trend of greater activation in the left hemisphere for younger subjects compared to the older group was revealed. The results have implications for the study of memory disorders afflicting older adults, like Alzheimer's disease.
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Date Issued
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2006
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PURL
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http://purl.flvc.org/fcla/dt/13358
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Subject Headings
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Brain--Magnetic resonance imaging, Evoked potentials (Electrophysiology), Memory, Cognition--Age factors, Aging--Psychological aspects, Memory disorders in old age
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Format
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Document (PDF)