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A Structure and Antioxidant Activity Study of Paracetamol and Salicylic Acid

Pharmacology & Pharmacy 2014年第13期5卷 1185-1191页

作者： rosivaldo sborges Taina G.Barros Glaecia A.N.Pereira Joao Batista Jr Raimundo F.G.P.Beleza Filho Andrex A.S.Veiga Moises Hamoy Vanessa J.Mello Alberico B.Fda Silva Carlos A.L.Barros Nucleo de Estudos e Selecao de Moleculas Bioativas Instituto de Ciencias da SaudeUniversidade Federal do ParaBelemBrazil Laboratorio de Farmacologia e Toxicologia de Produtos Naturais Instituto de Ciencias da SaudeUniversidade Federal do ParaBelemBrazil Instituto de Quimica de Sao Carlos Universidade de Sao PauloSao CarlosBrazil

The paracetamol has more antioxidant properties than the salicylic acid on the several oxidative stress-forced models and one possible mechanism is due to electron or hydrogen transfer by the evaluated hydroxyl radicals. The antioxidant mechanism for the compounds studied here was performed by molecular modeling using quantum chemical calculations at the B3LYP level of theory. Our results show that the paracetamol has more antioxidant properties than the salicylic acid in experimental and theoretical studies. The theoretical mechanism show that the hydrogen transfer is more favorable than the electron transfer. From the study it was concluded that the electron abstraction for paracetamol is more favored than salicylic acid.

关键词： Paracetamol Salicylic Acid Phenol Derivatives NSAIDs Antioxidant

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Metrological Analysis of Sunflower Prototype

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Smart Grid and Renewable Energy 2015年第3期6卷 41-47页

作者： Hermes Jose Loschi Yuzo Iano rosivaldo Ferrarezi Neusa Rocha Ferrarezi Fabrizzio Daibert Conte Department of Communications Faculty of Electrical and Computer Engineering State University of Campinas (UNICAMP) Campinas Brazil

It is well known that the solar tracking systems can increase the efficiency of the photovoltaic (PV) panel by about 30 percent. However, these systems require precise control of their components, mainly of the equipment’s used for the measurement of energy. In this paper, a metrology analysis is conducted, through of the results obtained by Sunflower prototype. The Sunflower is a solar tracking system developed by H. J. Loschi. A tracking system through a microcontrolled timing logic, sending commands to a linear actuator that moves the system. The deductions, based on in research trials, confirms that the Sunflower prototype is more efficient in relation to fixed PV panels, it is possible to observe the difference in the efficiency of 31%, with a variation of ±0.8% (that depends the solar irradiation). The main purpose of this paper is to attest to the quality of the measurements carried out during the performance tests of the Sunflower prototype, evaluating the uncertainty of measurements collected through the measurements equipment, and, introducing methods to minimize uncertainties of measurement equipment in the PV systems.

关键词： Photovoltaic-PV Tracking Metrological Sunflower Prototype

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Surface Modification of Commercial Activated Carbon (CAG) for the Adsorption of Benzene and Toluene

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American Journal of Analytical Chemistry 2015年第6期6卷 528-538页

作者： Anna Sylmara da Costa Lopes Samira Maria Leao de Carvalho Davi do Socorro Barros Brasil rosivaldo de Alcantara Mendes Marcelo Oliveira Lima Universidade Federal do Para BelemBrasil Instituto Evandro Chagas AnanindeuaBrasil

In this work, we determined the surface characteristics of natural (CA-1) and HNO3 treated (CA-2) CAG. Equilibrium, kinetics and breakthrough for adsorption of benzene and toluene by CA-1 and CA-2 were studied. Concentrations of benzene and toluene (mg/L) were determined by gas chromatography with headspace extraction. The data of adsorption kinetic and equilibrium were best fitted by pseudo-second order model and Langmuir isotherm, respectively. The best results of benzene and toluene adsorption from fixed bed were obtained at volumetric flow rate (Q1 = 70 mL/min) using adsorbent CA-2. The study of inferential statistics revealed that CA-1 and CA-2 adsorbents are statistically different at a 5% significance level.

关键词： Adsorption Activated Carbon Surface Modification Benzene Toluene

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A Structure and Antioxidant Activity Study of Paracetamol and Salicylic Acid

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Pharmacology & Pharmacy（药理与制药） 2014年第13期

作者： rosivaldo S. Borges Tainá G. Barros Glaécia A. N. Pereira Jo？o Batista Jr. Raimundo F. G. P. Beleza Filho Andrex A. S. Veiga Moisés Hamoy Vanessa J. Mello Albérico B. F. da Silva Carlos A. L. Barros

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