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Aguiar, Pedro Nazareth Junior,Ribas, Christian,Forones, Nora Manoukian Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.13
Background: Despite the decreased incidence, gastric cancer is still a frequent cause of cancer related death. The 1st line 2 or 3 drugs regimen is still a debatable issue. HER2 targeted therapy has emerged as the standard of care, but it is unavailable in the Brazilian Public Health System. The end-point of this trial was overall survival (OS) in patients with metastatic gastric cancer treated in a public university hospital in Brazil. The secondary end-points were efficacy and safety of regimens with 2 (F+P) or 3 (EOX) drugs to develop an institutional guideline to facilitate optimal treatments. Materials and Methods: In this retrospective study, 1st line regimens were evaluated for OS and PFS stratified by age and ECOG using Cox regression. Results: 47 patients were treated over the last 3 years. In 1st line, 29 were treated with F+P (mean 59.3 years, 34.5% ECOG 2 and a mean of 5.69 cycles) and 16 with EOX (mean 47 years, 18.8% ECOG 2 and a mean of 5.44 cycles). The median OS was 13.8 months (95%CI 10.7-16.9). Response was evaluated in 40 cases and was 64.3% for EOX and 37.5% for F+P (p=0.25). The median PFS was 9.5 months for EOX and 5.6 months for F+P (HR 0.85, 95%CI 0.41-1.74). However, among patients with ECOG 2 mPFS was 3.70 vs 5.40 months, respectively (p=0.86). Regimens showed similar manageable adverse events. A total of 34 patients suffered progression and 14 received $2^{nd}$ line therapy. Diffuse histology (HR 1.89, 95%CI 1.22-2.88), achieving 2nd line (HR: 0.25, 95%CI 0.11-0.58) and treatment response (HR 0.23, 95%CI 0.12-0.47) were OS prognostic factors. Conclusions: Patients treated in our hospital had outcomes compatible with the literature. The regimen choice should be related to patient features. Second line treatment should be considered.
Performance of Concrete in Aggressive Environment
Aguiar, Jose B.,Camoes, Aires,Moreira, Pedro M. Korea Concrete Institute 2008 International Journal of Concrete Structures and M Vol.2 No.1
Surface treatments act as a barrier between the environment and the concrete, preventing or retarding the entry of harmful substances and cutting off the transportation path into concrete. The effectiveness of a surface protection preventing the permeation depends on how close and strongly connected are the resin molecules. This work intends to contribute to a better understanding of the performance of protected concrete in chemically aggressive environments, by presenting results of ion diffusion and resistance to aggressive solutions of several hydrophobic agents and coatings used to protect concrete. Three different types of surface protections were tested: silicone hydrophobic agent, acrylic and epoxy coatings. The obtained results indicate that the overall performance of epoxy resin was better than the other selected types of protections.
Spectroscopic Evidence for Aggregation of Stilbene Derivatives in Solution
Aguiar, M.,Akcelrud, L.,Pinto, M.R.,Atvars, T.D.Z.,Karasz, F.E.,Saltiel, Jack Korean Society of Photoscience 2003 Journal of Photosciences Vol.10 No.1
The absorption, fluorescence and fluorescence-excitation spectra of concentrated toluene solutions of selected para substituted trans-stilbene derivatives provide strong evidence for aggregation. A red-shifted fluorescence spectrum peaking at 420 nm gains in intensity as the stilbene concentration is increased. The excitation spectrum of this new emission is well to the red of the normal stilbene absorption spectrum, consistent with the appearance of a red shifted shoulder in the UV spectrum. Formation of a fluorescent ground state dimer (or higher aggregate) is proposed to account for these observations. The presence of polar substituents is crucial to the formation of this ground state complex.
Effect of ultrasonic tip designs on intraradicular post removal
Aguiar, Anny Carine Barros,de Meireles, Daniely Amorim,Marques, Andre Augusto Franco,Sponchiado, Emilio Carlos Junior,Garrido, Angela Delfina Bitencourt,Garcia, Lucas Da Fonseca Roberti The Korean Academy of Conservative Dentistry 2014 Restorative Dentistry & Endodontics Vol.39 No.4
Objectives: To evaluate the effect of different ultrasonic tip designs on intraradicular post removal. Materials and Methods: The crowns of forty human canine teeth were removed, and after biomechanical preparation and filling, the roots were embedded in acrylic resin blocks. The post spaces were made, and root canal molding was performed with self-cured acrylic resin. After casting (Cu-Al), the posts were cemented with zinc phosphate cement. The specimens were randomly separated into 4 groups (n = 10), as follows: G1 - no ultrasonic vibration (control); G2 - ultrasonic vibration using an elongated cylindrical-shaped and active rounded tip; G3 - ultrasonic vibration with a flattened convex and linear active tip; G4 - ultrasonic vibration with active semicircular tapered tip. Ultrasonic vibration was applied for 15 seconds on each post surface and tensile test was performed in a Universal Testing Machine (Instron 4444 - 1 mm/min). Results: G4 presented the highest mean values, however, with no statistically significant difference in comparison to G3 (p > 0.05). G2 presented the lowest mean values with statistically significant difference to G3 and G4 (p < 0.05). Conclusions: Ultrasonic vibration with elongated cylindrical-shaped and active rounded tip was most effective in reducing force required for intraradicular post removal.
Cristiane Aguiar da Costa,Dayane Teixeira Ognibene,Viviane Silva Cristino Cordeiro,Graziele Freitas de Bem,Izabelle Barcellos Santos,Ricardo Andrade Soares,Letı´cia L. de Melo Cunha,Lenize C. R.M. Car 한국식품영양과학회 2017 Journal of medicinal food Vol.20 No.10
Previously, we have demonstrated that the seeds of Euterpe oleracia Mart. (açaí) are rich in polyphenols with antihypertensive and antioxidant properties. This study evaluated the renal protective effects of the hydroalcoholic extract obtained from the seeds of açaí (ASE) fruits in two-kidney, one-clip (2K1C) renovascular hypertension. Young male Wistar rats were used to obtain 2K1C and sham groups. Animals received ASE (200 mg/(kg·day) in drinking water) or vehicle for 40 days. We evaluated serum and urinary parameters, renal structural changes, and oxidative status. The increase in systolic blood pressure of the 2K1C group was accompanied by a decrease in left kidney volume and number of glomeruli, as well as an increase in glomerular volume and collagen deposition. ASE prevented the alterations of these parameters, except the reduced kidney volume. Serum levels of urea and creatinine and urinary protein excretion were increased in the 2K1C group and treatment with ASE improved all these functional parameters. The increased oxidative damage in the 2K1C group, assessed by lipid and protein oxidation, was prevented by ASE. The nitrite content and both expression and activity of antioxidant enzymes (superoxide dismutase-1, catalase, and glutathione peroxidase) were lower in the 2K1C group and restored by ASE. ASE substantially reduced renal injury and prevented renal dysfunction in 2K1C rats probably through its antihypertensive and antioxidant effects, providing a natural resource for treatment and prevention of renovascular hypertension-related abnormalities.
Effects of a Critical Thinking College English Writing Class
Bryan Aguiar,Myeong-Hee Seong 한국영어어문교육학회 2014 영어어문교육 Vol.20 No.3
English writing instructions in the Korean EFL context rarely perform research with a focus on critical thinking. This paper investigates the effects of a critical thinking college writing class on the writing of a class of 15 beginning writers with an intermediate level of English. A translation test consisting of 15 questions, as well as a free writing self-introduction assignment were conducted as a pre-test and a post-test at the beginning and end of the semester, respectively. The accuracy of the translation text was examined, as well as the fluency, complexity and accuracy of the free writing were analyzed qualitatively. Though the grammar didn’t improve much compared with a class with a Korean instructor, according to the analysis of accuracy, fluency and complexity of the free writing, the students exhibited increased confidence, creativity and a greater focus on abstract topics in the content and self-expression of their free writing.
de Aguiar Guilherme Carletti,Batalha Daniel Carreira,Fajardo Humberto Vieira,Filho José Balena Gabriel,Bruziquesi Carlos Giovanni Oliveira,de Oliveira Luiz Carlos Alves,Gonçalves Mateus Aquino,Ramalho 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.10
In this work, the application of a new, synthesized niobium-based catalyst, called S4 (niobium oxyhydroxide), in the liquid-phase oxidation of methyl-phenyl sulfide (thioanisole) using hydrogen peroxide as oxidant was proposed. The synthetic method employed provided a material with low crystallinity and high specific surface area and acidity. A commercial material, called HY-340 (hydrated niobium oxide), was also employed as heterogeneous catalyst for comparative purposes. The results showed that the synthesized S4 material is an outstanding catalyst, being able to completely convert the substrate (thioanisole) that achieves almost 90% of selectivity for methyl phenyl sulfone formation, under mild reaction conditions. According to the theoretical and experimental combined results, the superior performance of S4 catalyst is related to the better interaction of H2O2 and thioanisole molecules with S4 surface, compared to HY-340, pointing to the greater ability of this catalyst to form reactive oxygen species in contact with hydrogen peroxide, due to its higher content of free hydroxyl groups present on its surface.