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Mostrando 25-36 de 780 artigos, teses e dissertações.
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25. VOTOS, PARTIDOS E ELEIÇÕES NA PRIMEIRA REPÚBLICA: A DINÂMICA POLÍTICA A PARTIR DAS CHARGES DE O MALHO
Resumo Este artigo avalia, através de charges publicadas na revista O Malho entre 1902 e 1910, a percepção dos caricaturistas e/ou editores desse periódico acerca dos processos políticos republicanos - a prática eleitoral, a classe política e suas instituições - e de como tal interpretação era divulgada. As publicações revelam a dinâmica eleito
Rev. Hist. (São Paulo). Publicado em: 04/02/2019
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26. Multivariate Analysis and Machine Learning in Properties of Ultisols (Argissolos) of Brazilian Amazon
ABSTRACT: Ultisols are the most common soil order in the Brazilian Amazon. The Legal Amazon (LA) has an area of 5 × 106 km2, with few accessible areas, which restricts studies of soils at a detailed level. The pedological properties can be estimated more efficiently using statistical procedures and machine learning techniques, tools which are capable of rec
Rev. Bras. Ciênc. Solo. Publicado em: 06/12/2018
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27. Stability and rheological behavior of coconut oil-in-water emulsions formed by biopolymers
Abstract Proteins are frequently used as emulsifiers and stabilizers. In this work, two proteins with different isoelectric points were used: lactoferrin and ovalbumin. Solutions containing different proteins ratios, with different pH values, were stored for 7 days at 25 °C to analyze the system stability. Systems containing 3% w/v lactoferrin remained sta
Polímeros. Publicado em: 29/11/2018
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28. Synthesis, Characterization, and Photocatalytic Properties of Flower-like Mn-doped Ceria
Mn-doped CeO2 flower-like microstructures have been synthesized by a facile one-step composite-hydroxide-mediated method. The structure, morphology, optical and the surface properties of Mn doped CeO2 have been investigated by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), UV-Vis absorption spectroscopy and X-ray photoelectron
Mat. Res.. Publicado em: 16/07/2018
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29. Evaluation of the influence of fluoroquinolone chemical structure on stability: forced degradation and in silico studies
ABSTRACT Fluoroquinolones are a known antibacterial class commonly used around the world. These compounds present relative stability and they may show some adverse effects according their distinct chemical structures. The chemical hydrolysis of five fluoroquinolones was studied using alkaline and photolytic degradation aiming to observe the differences in mo
Braz. J. Pharm. Sci.. Publicado em: 14/05/2018
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30. Control of mycotoxigenic fungi with microcapsules of essential oils encapsulated in chitosan
Abstract Aspergillus and Fusarium are the fungi genera most frequently isolated from cereal grains and other commodities. They are capable of producing mycotoxins, which can affect the human and animal health. Synthetic fungicides have been used to control these fungi, nevertheless, they have acquired resistance and other alternatives are necessary since the
Food Sci. Technol. Publicado em: 21/12/2017
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31. Antifungal Properties of High Efficient W/WO3 Electrodes Acting under UV-Vis and Visible Light and Chloride Medium
The present work investigates the use of W/WO3 electrodes prepared by electrochemical anodization applied in the photoelectrocatalytic disinfection of Candida parapsilosis using ultraviolet-visible (UV-Vis) and visible irradiation. The core objective of this work lies in describing a novel approach involving the use of chloride as supporting electrolyte, aim
J. Braz. Chem. Soc.. Publicado em: 2017-11
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32. HIGH PRESSURE BEHAVIOR OF CRYSTALLINE DIHYDROXYLAMMONIUM 5,5'-BISTETRAZOLE-1,1'-DIOLATE: FIRST-PRINCIPLES STUDY
Density functional theory (DFT) periodic calculations were performed to study the geometrical and electronic structures of energetic compound dihydroxylammonium 5,5'-bistetrazole-1,1'-diolate (TKX-50) under the pressure ranging from 0 to 400 GPa. The optimized crystal structure by the local density approximation (LDA) with CA-PZ functional matches well with
Quím. Nova. Publicado em: 2017-10
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33. FACILE SYNTHESIS, CHARACTERIZATION AND DFT CALCULATIONS OF 2-ACETYL PYRIDINE DERIVATIVES
Deprotonation of 2-acetylpyridine was carried out in the presence of NaH as a phase transfer catalyst instead of NaOH to minimize side products formation. The products were then treated with two equivalents of alkyl/aryl halide to synthesize a variety of acetyl pyridine derivatives. The compounds were structurally characterized by 1H- and 13C-NMR spectroscop
Quím. Nova. Publicado em: 2017-09
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34. Sodium Chloride Crystallization by Electric Discharge in Brine
Electrical discharges in liquids are currently used to synthesize nanoparticles. The plasma-liquid interaction is complex, where parameters such as electric field, ion charges and other species present are important. In order to understand the mechanism of crystallization, mother liquor (saturated solution of NaCl, MgCl2 and KCl) was used to study the effect
Mat. Res.. Publicado em: 06/07/2017
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35. Studies of the Colloidal Properties of Superparamagnetic Iron Oxide Nanoparticles Functionalized with Platinum Complexes in Aqueous and PBS Buffer Media
This work has focused on the synthesis of three nanosystems composed of superparamagnetic iron oxide nanoparticles (SPIONs) coated either with a carboxylate platinum(IV) complex (PD = cis,cis,trans-[Pt(NH3)2Cl2(HOOCCH2CH2COO)(OH)]) or with platinum(II) complex functionalized dextrans (DexPt1 = [Pt(Dex-NH2)Cl3] and DexPt2 = [Pt(Dex-NH2)(NH3)2(H2O)]). All nano
J. Braz. Chem. Soc.. Publicado em: 2017-05
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36. Estudio teorico de las interacciones de dos modelos de ácidos húmicos con los cationes Al3+, Ca2+, Mg2+, Zn2+, K+ y NH4+ a un nivel de calculo DFT y un modelo de solvatación PCM
In this paper, two models of humic acids, the Temple-Northeastern-Birmingham (TNB) and Kolla models, were studied. Also, the complexation reaction of the structures formed by the interaction of the TNB and Kolla models with Al3+, Ca2+, Mg2+, Zn2+, K+ and NH4+ cations, common in agricultural soils, was studied. These calculations were made for the complexes,
Quím. Nova. Publicado em: 2017-04