Magnetic Structure Determination
Mostrando 1-12 de 50 artigos, teses e dissertações.
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1. Synthesis, Three-Dimensional Structure, Conformation and Correct Chemical Shift Assignment Determination of Pharmaceutical Molecules by NMR and Molecular Modeling
This work includes the synthesis of phenanthrenequinone guanylhydrazone and phenanthro[9,10-e][1,2,4]triazin-3-amine to be tested as intercalate with DNA for treatment of cancer. The other synthesized product, 2-[(4-chlorophenylamino)methylene]malononitrile, was designed for future determination of its activity against leishmaniasis. A common problem about s
J. Braz. Chem. Soc.. Publicado em: 2017-06
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2. Ixorine, a New Cyclopeptide Alkaloid from the Branches of Ixora brevifolia
The isolation and structure determination of new cyclic peptide alkaloid ixorine, along with five known constituents frangulanine, syringaresinol, cinnamtannin B-1, daucosterol and mannitol from the branches of Ixora brevifolia are described. The cyclic peptide frangulanine is being described for the first time in the Rubiaceae family. The structures were el
J. Braz. Chem. Soc.. Publicado em: 2016-04
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3. Kinetic Investigation of Thermal Formation Processes of SiOC Glasses Derived from C-Containing Hybrid Polymeric Networks
In this study, hybrid polymeric networks were prepared by hydrosilylation reaction as precursors to silicon oxycarbide (SiOC) glass. The polymeric networks were prepared from poly(methylsiloxane) (PMS) and divinylbenzene (DVB) in the 80:20 and 20:80 (PMS/DVB) compositions, with or without activated charcoal (AC), which was used as additional carbon source. F
J. Braz. Chem. Soc.. Publicado em: 2015-05
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4. Selective Determination of 2,4,6-Trinitrotoluene in Water Samples Based on Magnetic Imprinted Nanoparticles via Grafting Polymerization
The magnetic surface imprinted polymer was effectively synthesized based on grafting polymerization for selective determination of 2,4,6-trinitrotoluene (TNT) as template molecule. The "grafting to" procedure was performed by copolymerizing of vinyl modified magnetic substrate with methacrylic acid (MAA) and ethylene glycol dimethacrylate (EGDMA) as function
J. Braz. Chem. Soc.. Publicado em: 2015-04
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5. Estudo de propriedades petrofísicas de rochas sedimentares por Ressonância Magnética Nuclear / Petrophysical properties study of sedimentary rocks by Nuclear Magnetic Resonance
The Nuclear Magnetic Resonance (NMR) technique is one of the most versatile techniques for scientific research, specially for the study of dynamics, structure and conformational of materials. In particular, its application in oil science is one of its first routine applications. Methodologies developed specifically to match this scientific community proved t
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/05/2012
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6. Enhance the Van der Waals energy efficiency calculi in genetic algorithms for protein structure prediction / Aumento da eficiência do cálculo da energia de van der Waals em algoritmos genéticos para predição de estruturas de proteínas
Proteins are molecules present in the living organism and essential for their life. To understand the function of a protein, its threedimensional structure (the correct positions of all its atoms in the space) should be known. From the structure of a vital protein of an organism that causes a human disease, it is possible to develop medicines for treatment o
Publicado em: 2010
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7. Doping phase diagrams of the heavy fermions Ce2MIn8 (M = Rh, IR) / Efeitos da substituição quimica nos diagramas de fases dos fermions pesados Ce2MIn8 (M = Rh e Ir)
This thesis describes the investigation of the physical properties of the (Cd, Sn, Ga)-doped Ce2MIn8 (M = Rh, Ir) intermetallic compounds. Temperature dependent magnetic susceptibility, heat capacity and electrical resistivity measurements were performed to characterize the macroscopic properties of the synthesized compounds. X-ray powder diffraction were us
Publicado em: 2009
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8. Efeitos de tamanho finito e interface em nanopartículas e nanocolóides magnéticos
In this work, we investigated magnetic nanoparticles based on copper ferrite, with mean sizes ranging between 3,5 nm e 10,7 nm. Such nanomaterials are chemically synthesized by hydrothermal coprecipitation and allow elaborating magnetic nanocolloids in aqueous and acidic medium thanks to a core-shell strategy that prevent the nanoparticles from dissolution.
Publicado em: 2008
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9. Analise estrutural e funcional da lipoproteina de membrana externa omla de Xanthomonas citri / NMR resolution structure of the outer membrane lipoprotein omla from Xanthomonas citri
The XAC1516 gene from the citrus canker pathogen, Xanthomonas axonopodis pv. citri (Xac), was selected for structural and functional studies in the context of the Fapesp Smolbnet program. XAC1516 codes for an outer membrane lipoprotein similar to members of the OmlA/SmpA (Outer membrane lipoprotein A/Small membrane protein A) family of small lipoproteins wid
Publicado em: 2008
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10. Redes de coordenaÃÃo com Ãons lantanÃdeos: sÃntese, caracterizaÃÃo e estudo espectroscÃpio
This work shows the synthesis of new metalorganic frameworks containing Eu3+ and Gd3+ ions, using 1,3,5,-benzenetrisbenzoic acid (H3BTB) as ligand. The H3BTB was synthesized in two steps and characterized by elemental analysis, infrared spectroscopy and nuclear magnetic resonance 1H and 13C; the obtained results confirm all literature dataâs. Networks of co
Publicado em: 2008
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11. Atribuição Inequívoca dos Sinais de RMN de 1H e de 13C do Glaucolídeo B, Síntese de seus Derivados e Síntese de 2-Fenil-6,7-exo-Isopropilidenodioxi- 8-Oxabiciclo-[3.2.1]-Oct-2-eno, Visando a Obtenção de Novos Herbicidas
Considering the increasing need of new chemical products for the rational and efficient weeds control, it was conducted a research of new compounds provided with herbicide activity, as well as the study for unequivocal determination of Glaucolide B [1], structure a sesquiterpene lactone containing a cycle of ten members. For this, the Glaucolide B was isolat
Publicado em: 2008
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12. "Spin and magnetic properties of the III-V group semiconductors" / "Propriedades magnéticas e de spin em semicondutores do grupo III-V"
We present the results of our investigations concerning MBE grown AlGaAs/GaAs parabolic quantum well (PQW) samples. We focused on the variation of the Landé g factor along the structure of the PQWs, which occur as a consquence of its dependence on the Al content on the alloy AlGaAs. The implications are studied by Hall and Shubnikov-de Haas measurements. Sh
Publicado em: 2006