Two Dimensional Correlation Spectroscopy
Mostrando 1-12 de 32 artigos, teses e dissertações.
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1. A Complete and Unambiguous 1H and 13C NMR Signals Assignment of para-Naphthoquinones, ortho- and para-Furanonaphthoquinones
A complete and unambiguous assignment of 1H and 13C nuclear magnetic resonance (NMR) signals of 29 naphthoquinones is reported on the basis of one- and two-dimensional NMR techniques (1H, 13C, 1H-1H correlated spectroscopy (COSY) and 1H-13C heteronuclear multiple-bond correlation (HMBC)). This is the first report distinguishing data between para-naphthoquino
J. Braz. Chem. Soc.. Publicado em: 23/05/2019
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2. Comparison of ICP OES and LIBS Analysis of Medicinal Herbs Rich in Flavonoids from Eastern Europe
Essential and toxic metals were determined in eighteen samples of medicinal herbs from Poland, Lithuania and Serbia by means of laser-induced breakdown spectroscopy (LIBS) and inductively coupled plasma optical emission spectrometry (ICP OES). Calcium, K and Mg concentrations were obtained in % (m/m) and other metals (Na, Co, Cu, Fe, Mn, Ni, Zn, Cd, Cr and P
J. Braz. Chem. Soc.. Publicado em: 2017-05
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3. Espectroscopia de correlação bidimensional: fundamentos, aplicações e perspectivas
This paper presents the basic theory of generalized two-dimensional correlation spectroscopy. This method is applicable to various types of spectroscopy, including Infrared, Near Infrared and Raman Spectroscopy and it emphasizes spectral features not readily observable in conventional one-dimensional spectra. Some applications are cited, including work devel
Química Nova. Publicado em: 2006-02
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4. Use of two-dimensional correlation spectroscopy and construction and evaluation of a near-infrared spectropolarimeter / Uso da espectroscopia de correlação bidimensional (2D) e construção e avaliação de um espectropolarímetro para a região do infravermelho próximo (NIR)
The two-dimensional correlation spectroscopy was used in this work as a tool for spectral variable selection in the near-infrared (NIR) region aiming the determination of the following quality parameters of gasoline: ethanol content, MON (Motor Octane Number) and RON (Research Octane Number). To achieve this objective, it was developed a flow system to autom
Publicado em: 2006
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5. Study of amazon floodplain water composition using hyperion/EO-1 and field reflectance data for the comprehension of temporal variability of optically active constituents / Estudo da composição das águas da planície amazônica por meio de dados de reflectância do sensor hyperion/EO-1 e de espectrômetro de campo visando a compreensão da variação temporal dos seus constituintes opticamente ativos
Two methodological approaches were evaluated to study the reflectance of optically active constituents using hyperspectral imagery of EO-1 Hyperion orbital sensor: a) Linear Spectral Mixture Model; and b) derivative analysis. Two Hyperion images acquired over an area located upstream of the confluence between the Amazon and the Tapajós rivers were analysed,
Publicado em: 2006
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6. The use of Generalized Two-Dimensional FT-Raman Correlation Spectroscopy method to monitor the quality of automotive gasoline. / Qualidade de gasolinas automotivas através de Espectroscopia Vibracional FT-Raman, combinada com correlação 2D generalizada.
Relata a utilização da espectroscopia FT-Raman combinada com Correlação 2D Generalizada como método alternativo para a realização do controle de qualidade de Gasolinas automotivas diretamente nos postos de combustível. Apresenta os procedimentos para identificar a adulteração da Gasolina automotiva pela adição irregular de Etanol, Metanol e compo
Publicado em: 2005
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7. DifusÃo e transporte na presenÃa de macromolÃculas. Imagens e espectroscopia por RMN
The electronic Overhauser effect was employed to enhance nuclear magnetic resonance images obtained in a magnetic eld of only 16 mT. Despite the weak magnetic eld, the technique can reveal, in some systems, various aspects of ionic transport and kinetics apparently not observed in conventional high-eld magnetic resonance imaging. We employed Overhauser imagi
Publicado em: 2004
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8. Saponins from Swartzia langsdorffii: biological activities
The presence of saponins and the molluscicidal activity of the roots, leaves, seeds and fruits of Swartzia langsdorffii Raddi (Leguminosae) against Biomphalaria glabrata adults and eggs were investigated. The roots, seeds and fruits were macerated in 95% ethanol. These extracts exerted a significant molluscicidal activity against B. glabrata, up to a dilutio
Memórias do Instituto Oswaldo Cruz. Publicado em: 2003-07
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9. Multiple quantum two-dimensional 1H--15N nuclear magnetic resonance spectroscopy: chemical shift correlation maps for exchangeable imino protons of Escherichia coli tRNAMetf in water.
A procedure based on multiple quantum two-dimensional nuclear magnetic resonance spectroscopy is described for generation of 1H--15N chemical shift correlation maps. The method is used to obtain 15N chemical shifts for the exchangeable imino protons in 1H--15N units of site-specifically labeled Escherichia coli tRNAMetf in water. The high sensitivity and exc
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10. Multiple-step relayed correlation spectroscopy: sequential resonance assignments in oligosaccharides.
A general property of the high-resolution proton NMR spectra of oligosaccharides is the appearance of low-field well-resolved resonances corresponding to the anomeric (H1) and H2 protons. The remaining skeletal protons resonate in the region 3-4 ppm, giving rise to an envelope of poorly resolved resonances. Assignments can be made from the H1 and H2 protons
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11. Automated projection spectroscopy (APSY)
This work presents the automated projection spectroscopy (APSY) method for the recording of discrete sets of j projections from N-dimensional (N ≥ 3) NMR experiments at operator-selected projection angles and automatic identification of the correlation cross peaks. The result from APSY is the fully automated generation of the complete or nearly complete pe
National Academy of Sciences.
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12. Two-dimensional IR correlation spectroscopy: Sequential events in the unfolding process of the λ Cro-V55C repressor protein
A question often posed in protein folding/unfolding studies is whether the process is fully cooperative or whether it contains sequential elements. To address this question, one needs tools capable of resolving different events. It seems that, at least in certain cases, two-dimensional (2D) IR correlation spectroscopy can provide answers to this question. To
The National Academy of Sciences.