Isomer Shift
Mostrando 1-12 de 20 artigos, teses e dissertações.
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1. Blue Glow Sticks: Cinnamic Acids and Arylacrylonitriles with Liquid-Crystalline Properties and Highly Fluorescent
Five new π-conjugated chromophores derived from acrylic acid and acrylonitrile were synthesized and their thermal and photophysical behaviors were analyzed. They were designed and synthesized through Knoevenagel condensations between arylacetylenebenzaldehydes and a methylene group activated from cyanoacetic and malonic acids. The characterization of the ta
J. Braz. Chem. Soc.. Publicado em: 2021-01
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2. Electronic Effect of V, Ti, and Sc Impurities on the Hyperfine Interactions of Fe Atoms in α-Fe: A First Principles Study
The Linearized Augmented Plane Wave method, as implemented in the Wien2k computational code, was used to investigate the effects of the 3d transition metals (TM) Sc, Ti, and V impurities on the hyperfine interaction of iron atoms in α-Fe. The calculation results of this study suggest that the introduction of a TM (TM = Sc, Ti, and V) impurity into α-Fe inc
Mat. Res.. Publicado em: 02/03/2017
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3. Other compounds isolated from Simira glaziovii and the ¹H and 13C NMR chemical shift assignments of new 1-epi-castanopsol
A new triterpene, 1-epi-castanopsol, besides eleven known compounds: sitosterol, stigmasterol, campesterol, lupeol, lupenone, simirane B, syringaresinol, scopoletin, isofraxidin, 6,7,8-trimethoxycoumarin and harman, were isolated from the wood of Simira glaziovii. The structures of the known compounds were defined by 1D, 2D ¹H, 13C NMR spectra data analyses
Quím. Nova. Publicado em: 2012
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4. Complexos carbonílicos de rutênio. De um gás tóxico a uma droga com potencial agente citotóxico
In this work ruthenium carbonyl complexes were synthesized and characterized which allowed an interesting spectroscopic and structural study as well as preliminary in vitro antitumor activity assays. Thus, the interests in the transition metal carbonyls, which carry and liberate CO, are also emerging as a pharmacological tool to mimic the bioactivity of endo
Publicado em: 2007
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5. Estudo de propriedades locais em impureza intersticiais em hospedeiros metálicos. / Study of Local Properties in Interstitial Impurities in Metalic Hosts.
Neste trabalho realizamos um estudo do comportamento do momento magnético e do deslocamento isomérico de uma impureza intersticial de Fe em hospedeiros metálicos de valências 4 (Ti, Zr), 3 (Sc, Y). Investigamos também impurezas intersticiais e substitucionais de Mo e Fe em hospedeiros divalentes. Para realizar este estudo fizemos cálculos de estrutura
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/08/1996
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6. Dark-adapted bacteriorhodopsin contains 13-cis, 15-syn and all-trans, 15-anti retinal Schiff bases.
13C NMR spectra of lyophilized dark-adapted [14-13C]retinyl-labeled bacteriorhodopsin show a large anomalous upfield shift for the 13C-14 resonance assigned to the 13-cis isomer, relative to both the all-trans isomer and model compounds. We attribute this to the so-called gamma effect, which results from a steric interaction between the C-14 retinal proton a
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7. Met-145 is a key residue in the dark adaptation of bacteriorhodopsin homologs.
Composition of retinal isomers in three proton pumps (bacteriorhodopsin, archaerhodopsin-1, and archaerhodopsin-2) was determined by high performance liquid chromatography in their light-adapted and dark-adapted states. In the light-adapted state, more than 95% of the retinal in all three proton pumps were in the all-trans configuration. In the dark-adapted
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8. Degradation of a Nonylphenol Single Isomer by Sphingomonas sp. Strain TTNP3 Leads to a Hydroxylation-Induced Migration Product
Sphingomonas sp. strain TTNP3 degrades 4(3′,5′-dimethyl-3′-heptyl)-phenol and unidentified metabolites that were described previously. The chromatographic analyses of the synthesized reference compound and the metabolites led to their identification as 2(3′,5′-dimethyl-3′-heptyl)-1,4-benzenediol. This finding indicates that the nonylphenol metabo
American Society for Microbiology.
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9. Evidence for Chlorine Migration during Oxidation of 2-Chlorobiphenyl by a Type II Methanotroph
Axenic methanotrophic culture strain CSC1, which was derived from a mixed-culture aquifer sample, oxidized 2-chlorobiphenyl to a hydroxylated chlorobiphenyl intermediate identified as 2-hydroxy-3-chlorobiphenyl. Minor amounts of another hydroxylated chlorobiphenyl isomer, assumed to be the nonmigrated product 3-hydroxy-2-chlorobiphenyl, were found in axenic
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10. The effect of the phenylalkylamine D888 (devapamil) on force and Ca2+ current in isolated frog skeletal muscle fibres.
1. The effects of the (+)- and the (-)-isomer of the phenylalkylamine derivative D888 (desmethoxyverapamil or devapamil) on isometric force and slow Ca2+ inward current were investigated in short toe muscle fibres of the frog (Rana temporaria). The experiments were performed under voltage-clamp conditions with two flexible internal glass microelectrodes at 1
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11. Rapid Induction of Distinct Stress Responses after the Release of Singlet Oxygen in ArabidopsisW⃞
The conditional fluorescent (flu) mutant of Arabidopsis accumulates the photosensitizer protochlorophyllide in the dark. After a dark-to-light shift, the generation of singlet oxygen, a nonradical reactive oxygen species, starts within the first minute of illumination and was shown to be confined to plastids. Immediately after the shift, plants stopped growi
American Society of Plant Biologists.
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12. APPLICATION OF 129I MOSSBAUER EFFECT TO BIOLOGICAL SYSTEMS: STUDIES WITH HEME MODELS*
The Mossbauer effect associated with 129I, 125Te, and 57Fe has been applied to investigate structural properties of the axial ligands in ferric-high spin hematoheme-I, hematoheme-Te, and hematoheme-histidine-iodide. The magnitude and sign of the 129I quadrupole coupling constant (e2qQ) and the isomer shift, as deduced from the Mossbauer effect spectra, are c