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Mostrando 1-12 de 355 artigos, teses e dissertações.
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1. Synthetic Studies toward (−)-Cleistenolide: Highly Stereoselective Synthesis of New γ-Lactone Subunits
This study describes the stereoselective synthesis of two new γ-lactones in 6 and 3 steps and 19 and 32% yield, respectively, directed toward the total synthesis of the natural product (−)-cleistenolide. The starting material was an enantiomerically pure diacetonide diol, derived from d-mannitol with the required stereocenters for (−)-cleistenolide synt
J. Braz. Chem. Soc.. Publicado em: 2021-04
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2. Yellow Mombin (Spondias mombin L.) Seeds from Agro-Industrial Waste as a Novel Adsorbent for Removal of Hexavalent Chromium from Aqueous Solutions
The objective of this study was to develop a low-cost and eco-friendly adsorbent from agro-industrial waste for the removal of hexavalent chromium in the aqueous medium. The adsorbent (BMC) produced from yellow mombin (Spondias mombin L.) seeds was characterized by the determination of the chemical composition, thermal analysis (thermogravimetric (TG) analys
J. Braz. Chem. Soc.. Publicado em: 2021-02
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3. The old-style public health measures and the novel coronavirus outbreak
ABSTRACT Introduction: Transverse preputial island flap urethroplasty (TPIFU) is one of the most frequently performed technique for single-stage repair in proximal hypospadias. It was reported that the subepithelial urethroplasty would obviously decrease urethrocutaneous fistula (UF) complication after proximal TIP. But in the process of TPIFU, it had not b
Int. braz j urol.. Publicado em: 2020-10
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4. A Choline Chloride-Ethylene Glycol Deep Eutectic Solvent Based on Magnetic Polydopamine with Preconcentration and Determination for Sulfonylurea Herbicides in Water Samples
In this study, a novel deep eutectic solvent (DES) containing choline chloride and ethylene glycol was synthesized, and the magnetic polydopamine (PDA) was modified with this deep eutectic solvent to form Fe3O4@PDA-DES. Fourier transformed infrared spectroscopy, scanning electron microscopy, and vibrating sample magnetometer were used to characterize the pro
J. Braz. Chem. Soc.. Publicado em: 2020-07
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5. THEORETICAL STUDIES ON DIACETONEDIPEROXIDE DERIVATIVES AND COMPARISONS WITH OTHER MULTI-PEROXIDIC COMPOUNDS
Diacetonediperoxide (DADP) derivatives were investigated with density functional theory (DFT) methods at the DFT-B3LYP and M06-2X/6-311++G (d, p) levels and were also compared with other multi-peroxidic compounds. The investigated derivatives were 3,6-dimethyl-3,6-diamine-1,2,4,5-tetraoxane (DADPNH2), 3,6-dimethyl-3,6-dinitro-1,2,4,5-tetraoxane (DADPNO2), an
Quím. Nova. Publicado em: 2020-06
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6. Prevalence and Molecular Analysis of Novel Newly Identified Periodontal Pathogens in Subgingival Plaque Samples of Saudi Patients with Chronic Periodontitis
Abstract Objective: To evaluate the prevalence of novel newly identified periodontal pathogenic strains in subgingival plaque samples and relate it with bleeding on probing, probing pocket depth and age. Material and Methods: 268 chronic periodontitis patients with a mean age of 46.0 ± 6.0 years were included. The following microorganisms were evaluated:
Pesqui. Bras. Odontopediatria Clín. Integr.. Publicado em: 31/10/2019
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7. Apical Debris Extrusion by Novel Endostar E5 Compared to Other Commercial Rotary Files: An in Vitro Study
Abstract Objective: To compare the amount of apical debris extrusion in samples instrumented by EndoStar E5, ProTaper Universal, and M-two rotary files. Material and Methods: Forty-five freshly extracted non-carious mandibular premolar teeth with single roots and single canals were acquired, and randomly divided into 3 groups (n=15). Samples in Groups 1, 2
Pesqui. Bras. Odontopediatria Clín. Integr.. Publicado em: 10/10/2019
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8. Fragmentation model for the tensile response of unidirectional composites based on the critical number of fiber breaks and the correction of the fiber-matrix interfacial strength.
Abstract A fragmentation model based on global load sharing (GLS) theory is developed to obtain stress-strain curves that describe the mechanical behavior of unidirectional composites. The model is named C N B + τ * because it is based on the Critical Number of Breaks model (CNB) and on the correction of the fiber matrix interfacial strength, τ *
Lat. Am. j. solids struct.. Publicado em: 15/08/2019
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9. BRÁS CUBAS, MARCELA E CRÔNICAS: DESEJO E INTERESSE
Resumo Análise da sequência de capítulos da obra Memórias póstumas de Brás Cubas, de Machado de Assis, acerca do relacionamento de Brás Cubas e Marcela. O encantamento do protagonista contrasta com o interesse apenas de proveito material por parte de Marcela. Ilusão, pragmatismo, decepção, interesse. O narrador defunto machadiano oscila entre o dis
Machado Assis Linha. Publicado em: 29/07/2019
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10. Rastros de cinema na teia literária urbana de Caio Fernando Abreu
RESUMO A meta é verificar de que forma os rastros de cinema são tecidos nos fios literários de “Pela noite”, de Caio Fernando Abreu, e por que seus personagens olham o mundo como se fosse cinema. Seriam reflexos da própria conversão do mundo contemporâneo em rastros de cinema e/ou de simulacros, que incluem também outros elos da indústria cultura
Rev. Inst. Estud. Bras.. Publicado em: 10/06/2019
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11. Velocidade limite c
Resumo Neste artigo, é proposta uma nova maneira de ensinar estudantes de graduação que a velocidade de luz c é um limite físico para corpos materiais. Dois diferentes 'gedankenexperimente', conceitualmente equivalentes, baseados em princípios de eletrodinâmica básica são propostos e discutidos, chegando à mesma conclusão de que se um corpo materi
Rev. Bras. Ensino Fís.. Publicado em: 14/03/2019
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12. BjussuLAAO-II induces cytotoxicity and alters DNA methylation of cell-cycle genes in monocultured/co-cultured HepG2 cells
Abstract Background: The use of animal venoms and their toxins as material sources for biotechnological applications has received much attention from the pharmaceutical industry. L-amino acid oxidases from snake venoms (SV-LAAOs) have demonstrated innumerous biological effects and pharmacological potential against different cancer types. Hepatocellular carc
J. Venom. Anim. Toxins incl. Trop. Dis. Publicado em: 11/03/2019