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On the Semiprimitivity and Semiprimality Problems for Partial Smash Products

Algebra Colloquium 2018年第1期25卷 1-30页

作者： rafael cavalheiro Alveri Sant'Ana Instituto de Matemdtica Estatfstica e Fisica Universidade Federal do Rio Grande Brazil Instituto de Matemdtica Universidade Federal do Rio Grande do Sul Brazil

In this paper we discuss about the semiprimitivity and the semiprimality of partial smash products. Let H be a semisimple Hopf algebra over a field k and let A be a left partial H-module algebra. We study the H-prime and the H-Jacobson radicals of A and their relations with the prime and the Jacobson radicals of A#H, respectively. In particular, we prove that if A is H-semiprimitive, then A^fH is semiprimitive provided that all irreducible representations of A are finite-dimensional, or A is an affine PI-algebra over k and k is a perfect field, or A is locally finite. Moreover, we prove that A=#=H is semiprime provided that A is an H-semiprime PI-algebra, generalizing to the setting of partial actions the known results for global actions of Hopf algebras.

关键词： partial Hopf action partial smash product semiprimitivity semiprimality H-radical partial (A H)-module

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Structural Analysis of Magnesium-Aluminium Hydrotalcites Modified with Iron III Obtained by Hydroxide Precipitation Method

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Materials Sciences and Applications 2017年第11期8卷 784-797页

作者： Graciele Vieira Barbosa Maria Aparecida Zaghete rafael Aparecido Ciola Amoresi Margarete Soares da Silva Alberto Adriano cavalheiro Rogério Cesar de Lara da Silva CDTEQ—Centro de Desenvolvimento de Tecnologias Químicas Universidade Estadual de Mato Grosso do Sul Navirai Brazil CDMF—Centro de Desenvolvimento de Materiais Funcionais Universidade Estadual Paulista Araraquara Brazil CEPEMAT—Centro de Pesquisas em Materiais Universidade Estadual de Mato Grosso do Sul Dourados Brazil

Hydrotalcite-type anionic clays are a group of important materials used in adsorption processes, mainly for organic pollutants removal due the layered double hydroxide structure. The layer-interlayer interactions provide a structural memory even after dehydration and dehydroxylation process, since a very stable interlayer anions are part of material composition, like the carbonate one. A limited numbers of trivalent modifier cations can replace the aluminium cation due the ionic radii mismatch or oxidation state restrictions. Transition metal cations can replace the aluminium one in octahedral site of hydroxide lamellas in order to improve the adsorptive behaviors. In this work, we have investigate three compositions of carbonated magnesium-aluminium hydrotalcite with dif-ferent iron (III) contents through the co-precipitation method at pH 11 and aging step at 60°C for 6 hours. Thermal analysis was performed aiming the determination of the hydration water and hydroxyl amounts in dried precipitate samples, taking in account the results obtained for X-ray diffractometry, infrared spectroscopy, and nitrogen adsorption-desorption characterization for several thermally treated samples. All of synthesized samples showed high surface areas, even for high temperature of thermal treatment. The co-substitution with iron (III) reduced the temperature of dehydration and dehydroxylation process, but the co-substitution at 5 mol% provides other desirables characteristics, like a more amount of rhombohedral HDL phase and higher porosity, even after the thermal treatment at 500°C for 4 hours. This result makes that composition very applicable as a reusable adsorbent material in order to removal several types of micro-pollutant compounds in aqueous media.

关键词： Hydrotalcite Layered Double Hydroxide Hydroxide Precipitation Iron (III)

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Changes in aminoacidergic and monoaminergic neurotransmission in the hippocampus and amygdala of rats after ayahuasca ingestion

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World Journal of Biological Chemistry 2013年第4期4卷 141-147页

作者： Eduardo Ferreira de Castro-Neto rafael Henrique da Cunha Dartiu Xavier da Silveira Mauricio Yonamine Telma Luciana Furtado Gouveia Esper Abr o cavalheiro Débora Amado Maria da Gra a Naffah-Mazzacoratti Departamento Neurologia/Neurocirurgia Universidade Federal de S o Paulo Departamento de Psiquiatria Universidade Federal de S o Paulo Faculdade de Ciências Farmacêuticas Universidade de S o Paulo Departamento de Bioquímica Universidade Federal de S o Paulo

AIM: To evaluate changes in neurotransmission induced by a psychoactive beverage ayahuasca in the hippocampus and amygdala of naive rats. METHODS: The level of monoamines, their main metabolites and amino acid neurotransmitters concentrations were quantified using high performance liquid chromatography(HPLC). Four groups of rats were employed: saline-treated and rats receiving 250, 500 and 800 mg/kg of ayahuasca infusion(gavage). Animals were killed 40 min after drug ingestion and the structures stored at-80 ℃ until HPLC assay. The data from all groups were compared using Analysis of variance and Scheffé as post test and P < 0.05 was accepted as significant. RESULTS: The results showed decreased concentrations of glycine(GLY)(0.13 ± 0.03 vs 0.29 ± 0.07, P < 0.001) and γ-aminobutyric acid(GABA)(1.07 ± 0.14 vs 1.73 ± 0.25, P < 0.001) in the amygdala of rats that received 500 of ayahuasca. Animals that ingested 800 mg/kg of ayahuasca also showed a reduction of GLY level(0.11 ± 0.01 vs 0.29 ± 0.07, P < 0.001) and GABA(0.98 ± 0.06 vs 1.73 ± 0.25, P < 0.001). In the hippocampus, increased GABA levels were found in rats that received all ayahuasca doses: 250 mg/kg(1.29 ± 0.19 vs 0.84 ± 0.21, P < 0.05); 500 mg/kg(2.23 ± 038 vs 084 ± 0.21, P < 0.05) and 800 mg/kg(1.98 ± 0.92 vs 0.84 ± 0.21, P < 0.05). In addition, an increased utilization rate of all monoamines was found in the amygdala after ayahuasca administration in doses: 250 mg/kg(noradrenaline: 0.16 ± 0.02 vs 0.36 ± 0.06, P < 0.01; dopamine: 0.39 ± 0.012 vs 2.39 ± 0.84, P < 0.001; serotonin: 1.02 ± 0.22 vs 4.04 ± 0.91, P < 0.001), 500 mg/kg(noradrenaline: 0.08 ± 0.02 vs 0.36 ± 0.06, P < 0.001; dopamine: 0.33 ± 0.19 vs 2.39 ± 0.84, P < 0.001; serotonin: 0.59 ± 0.08 vs 4.04 ± 0.91, P < 0.001) and 800 mg/kg(noradrenaline: 0.16 ± 0.04 vs 0.36 ± 0.06, P < 0.001; dopamine: 0.84 ± 0.65 vs2.39 ± 0.84, P < 0.05; serotonin: 0.36 ± 0.02 vs 4.04 ± 0.91, P < 0.001). CONCLUSION: Our data suggest increased release of inhibitory amin

关键词： Ayahuasca Amino Acids Monoamines Hippocampus Amygdala

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