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13 resultados
Radioprotective effects of 2-(allylthio)pyrazine an experimental chemopreventive agent: effects on detoxifying enzyme induction.
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2-(Allylthio)pyrazine (2-AP), which is effective in suppressing constitutive and inducible cytochrome P450 2E1 expression, exhibits hepatoprotective and chemopreventive effects. The radioprotective effects of 2-AP were examined in animals in association with the expression of microsomal epoxide
Pyrazine excited states revisited using the extended multi-state complete active space second-order perturbation method.
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We demonstrate that the recently developed extended multi-state complete active space second-order perturbation theory (XMS-CASPT2) [Shiozaki et al., J. Chem. Phys., 2011, 135, 081106] provides qualitatively correct potential energy surfaces for low-lying excited singlet states of pyrazine, while
Characteristics and properties of metal-to-ligand charge-transfer excited states in 2,3-bis(2-pyridyl)pyrazine and 2,2'-bypyridine ruthenium complexes. Perturbation-theory-based correlations of optical absorption and emission parameters with electrochemistry and thermal kinetics and related Ab initio calculations.
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The absorption, emission, and infrared spectra, metal (Ru) and ligand (PP) half-wave potentials, and ab initio calculations on the ligands (PP) are compared for several [L(n)()Ru(PP)](2+) and [[L(n)Ru]dpp[RuL'(n)]](4+) complexes, where L(n) and L'(n) = (bpy)(2) or (NH(3))(4) and PP = 2,2'-bipyridine
Antioxidative Metabolites Synthesized by Marine Pigmented Vibrio sp. and Its Protection on Oxidative Deterioration of Membrane Lipids.
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Bacterial strain Vibrio sp. (PIGB 184) isolated from water samples of the Arabian Sea and identified through 16S rRNA demonstrated the production of pigmentary antioxidants with higher ABTS activities 90.9 ± 0.42 % in comparison with the standard commercial pigmented antioxidant, quercetin 88.8 ±
Synthesis and evaluation of 2-(3-arylureido)pyridines and 2-(3-arylureido)pyrazines as potential modulators of Aβ-induced mitochondrial dysfunction in Alzheimer's disease.
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A series of 2-(3-arylureido)pyridines and 2-(3-benzylureido)pyridines were synthesized and evaluated as potential modulators for amyloid beta (Aβ)-induced mitochondrial dysfunction in Alzheimer's disease (AD). The blocking activities of forty one small molecules against Aβ-induced mitochondrial
Chemical screening identifies an extract from marine Pseudomonas sp.-PTR-08 as an anti-aging agent that promotes fission yeast longevity by modulating the Pap1-ctt1+ pathway and the cell cycle.
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Aging is a degenerative process characterized by progressive deterioration of cellular components, ultimately resulting in mortality, in which massive accumulation of reactive oxygen species (ROS) and advanced glycation end products (AGEs) are implicated as crucial factors. At the same time, natural
Four [Tp*W(μ3-S)3Cu3(μ3-Br)]-based clusters: synthesis, structural characterization and third-order NLO properties.
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Treatment of [Et(4)N][Tp*W(μ(3)-S)(3)(CuBr)(3)] (Tp* = hydridotris(3,5-dimethylpyrazol-1-yl)borate) (1) with an excess of α-methylpyridine (α-MePy) and NH(4)PF(6) in CH(2)Cl(2) afforded a cationic cluster [Tp*W(μ(3)-S)(3)Cu(3)(α-MePy)(3)(μ(3)-Br)](PF(6)) (2) while the reaction of 1 with an excess of
Anisotropy in Time-Resolved Photoelectron Spectroscopy in the Gas Phase.
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Transient absorption anisotropy is a well-established technique in time-resolved liquid phase spectroscopy. Here, we show how the technique is applied in the gas phase for time-resolved photoelectron spectroscopy and what type of additional information can be obtained as compared to other
Toxicity of morphazinamide compared with pyrazinamide.
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In a toxicological study on rats two derivatives of pyrazine: morphazinamide (MZA) and pyrazinamide (PZA) were compared with the objective to verify the possibility of using MZA as a substitute for the hepatotoxic PZA. The daily recorded weight and food intake of the rats were statistically
Design and Assembly of Covalently Functionalised Polyoxofluorovanadate Molecular Hybrids.
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Mixed-valent polyoxometalate (POM) clusters are one of the most interesting host species, showing a wide range of structural features and properties. The facile preparation and functionalisation of a mixed-valent polyoxofluorovanadates is reported, where two electrons are trapped to antipodal sites
An accurate benchmark description of the interactions between carbon dioxide and polyheterocyclic aromatic compounds containing nitrogen.
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We assessed the performance of a large variety of modern density functional theory approaches for the adsorption of carbon dioxide on molecular models of pyridinic N-doped graphene. Specifically, we selected eight polyheterocyclic aromatic compounds ranging from pyridine and pyrazine to
Effects of Chinese herbal products on mammalian retinal functions.
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Ocular ischemia and inflammation are two major factors which induce retinal degeneration. Treatment of these diseases has been difficult, though numerous agents have been tried. Natural products could be a good field to venture into because various medicinal plants have been used for centuries to
Functionalized Pt(II) and Ir(III) NIR emitters and their covalent conjugates with polymer-based nanocarriers.
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Two NIR emitting platinum [Pt(N^N^C)(phosphine)] and iridium [Ir(N^C)2(N^N)]+, complexes containing reactive succinimide groups were synthesized and characterized with spectroscopic methods (N^N^C - 1-phenyl-3-(pyridin-2-yl)benzo[4,5]imidazo[1,2-a]pyrazine, N^C - 6-(2-benzothienyl)phenanthridine,
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