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Bruno Dorneles de Castro,Kláudia Maria Machado Neves Silva,Rômulo Maziero,Paulo Eustáquio de Faria,Priscila Pereira Silva-Caldeira,Juan Carlos Campos Rubio 한국섬유공학회 2020 Fibers and polymers Vol.21 No.8
The use of treatments in natural fibers is largely used, because it can improve the interfacial adhesion of polymercomposites. However, the choice of the most appropriate treatment should take into account environmental factors, due to theneed of new materials to meet requirements related to the concept of sustainability. This article investigated the influence ofthe mercerization, acetylation and gamma radiation treatments on the mechanical properties of sisal fibers, to use incomposite materials. Experimental conditions were defined with different concentrations of reagents and radiation doses inorder to understand the impact of these reactions on the tensile properties of sisal fibers. Thermal gravimetric analysis (TGA)and Fourier Transform Infrared (FTIR) spectroscopy were used to investigate the fiber degradation process and the chemicalmodifications after the treatments. The use of mercerization (0.1 M and 1.0 M NaOH concentrations) combined withacetylation increased the hydrophobic character of the sisal fiber, which may improve its interaction with polymeric matrices. In addition, mercerized sisal fiber at 0.5 M NaOH concentration, exposed to 25 kGy gamma radiation dose, showed physicaland chemical structural changes that positively influence the fiber-matrix adhesion in polymer composite materials. Alltreatments made can reduce the natural tensile properties of the sisal fibers, because they can remove fundamentalcomponents to the structure and the stiffening of these fibers. Considering changes in the mechanical behavior, the use ofgamma radiation presented similar results of the traditional chemical treatments, being less aggressive to the fibers and notcausing the same negative impact on the environment.
Bruno Salomão Hirsch,Igor Braga Ribeiro,Mateus Pereira Funari,Diogo Turiani Hourneaux de Moura,Sergio Eiji Matuguma,Sergio A. Sánchez-Luna,Fabio Catache Mancini,Guilherme Henrique Peixoto de Oliveira 대한소화기내시경학회 2021 Clinical Endoscopy Vol.54 No.5
Background/Aims: Argon plasma coagulation (APC) is the most commonly used endoscopic treatment for gastric antral vascularectasia (GAVE). Endoscopic band ligation (EBL) has emerged as an alternative therapy. Our goal was to evaluate the feasibility,efficacy, and safety of APC and EBL for the treatment of GAVE. This is the first systematic review that included only randomizedcontrolled trials (RCTs) on this topic. Methods: A comprehensive search was performed using electronic databases to identify RCTs comparing APC and EBL for thetreatment of GAVE following the Preferred Reporting Items for Systematic Reviews and Meta-analyses guidelines. Results: Four RCTs were included, with a total of 204 patients. EBL was related to higher endoscopic eradication rates risk difference[RD], 0.29; 95% confidence interval [CI] [0.14, 0.44]; I2=0%) and less bleeding recurrence than APC (RD, 0.29; 95% CI [0.15, 0.44];I2=0%). Patients treated with EBL required fewer blood transfusions (mean difference [MD], 1.49; 95% CI [0.28, 2.71]; I2=96%) andhospitalizations (MD, 0.29; 95% CI [0.19, 0.39]; I2=0%). The number of sessions required for the obliteration of lesions was higherwith APC. There was no difference in the incidence of adverse events. Conclusions: EBL is superior to APC in the treatment of GAVE in terms of endoscopic eradication rates, recurrence of bleeding, andtransfusion requirements.
Catiane S. Souza,Bruno M. Oliveira,Gustavo G. L. Costa,Albert Schriefer,Alessandra Selbach-Schnadelbach,Ana Paula T. Uetanabaro,Carlos P. Pirovani,Gonçalo A. G. Pereira,Alex G. Taranto,Júlio Cézar de 한국미생물학회 2009 The journal of microbiology Vol.47 No.4
Chitin synthase (CHS) is a glucosyltransferase that converts UDP-N-acetylglucosamine into chitin, one of the main components of fungal cell wall. Class III chitin synthases act directly in the formation of the cell wall. They catalyze the conversion of the immediate precursor of chitin and are responsible for the majority of chitin synthesis in fungi. As such, they are highly specific molecular targets for drugs that can inhibit the growth and development of fungal pathogens. In this work, we have identified and characterized a chitin synthase gene of Moniliophthora perniciosa (Mopchs) by primer walking. The complete gene sequence is 3,443 bp, interrupted by 13 small introns, and comprises a cDNA with an ORF with 2,739 bp, whose terminal region was experimentally determined, encoding a protein with 913 aa that harbors all the motifs and domains typically found in class III chitin synthases. This is the first report on the characterization of a chitin synthase gene, its mature transcription product, and its putative protein in basidioma and secondary mycelium stages of M. perniciosa, a basidiomycotan fungus that causes witches’ broom disease of cacao.
Ahlem Boussenna,Juliette Joubert-Zakeyh,Didier Fraisse,Bruno Pereira,Marie-Paule Vasson,Odile Texier,Catherine Felgines 한국식품영양과학회 2016 Journal of medicinal food Vol.19 No.8
Evidence from several epidemiological and experimental studies points to a beneficial role of dietary polyphenols in inflammatory bowel disease. In this study, we investigate the protective effect of dietary supplementation with various amounts of a polyphenol-rich grape pomace extract (GPE) on the development of dextran sulfate sodium (DSS)-induced colitis in rats. Rats were fed 21 days on a semisynthetic diet enriched with GPE (0.1%, 0.5%, and 1%), and acute colitis was induced by DSS (40 g/L in the drinking water) administration during the last 7 days. The low GPE content in the diet (0.1%) attenuated clinical signs and colon shortening and limited DSS-induced histological lesions. GPE 0.1% also attenuated the DSS-induced increase in myeloperoxidase activity and improved superoxide dismutase activity. Higher amounts of GPE in the diet induced only weak and nonsignificant protective effects. These results suggest that consumption of a low amount of polyphenol-rich GPE helps protect against colitis development.
Rahul Davis,Abhishek Singh,Robson Bruno Dutra Pereira,Roberta Maia Sabino,Ketul Popat,Paulo Soares,Lincoln Cardoso Brandão 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.10 No.6
Shape memory alloys are mainly used in medical devices and surgical implants due to their biocompatibility. Machining these alloys into intricate patterns can be challenging due to their poor thermal conductivity which could lead to a poor surface finish. The poor surface finish causes a release of toxic elements such as Nickel, leading to contact allergies and thus deteriorating its biocompatibility. Using the right cooling technology can help improve their machinability and overcome issues related to surface integrity. The current study investigates the effect of milling parameters (cutting-speed, feed rate, and depth of cut) and different cooling strategies (flood coolant, cryogenic liquid nitrogen, and a hybrid approach) on the surface integrity of F2063 Ni55.6Ti44.4 shape memory alloy. In addition, the effect of cryogenically treating the cutting tool for further enhancement of surface finish was investigated. A considerable modification on the milled surfaces was observed when using the hybrid cooling/milling approach and cryo-treated tools in terms of morphological, chemical compositional, crystallographic, and microhardness. In addition, this modified surface had a noticeably improved bioactivity due to enhanced hydrophobicity (with contact angle 92°) and surface topography (Ra: 341.69 nm), which favoured cell adhesion and proliferation. The results indicate that the modified Ni55.6Ti44.4 alloy surface might be adequate for use in medical applications.
Numerical model of a planar jet wiping system for continuous strip lines
Celia Miguel-González,Manuel García-Díaz,Bruno Pereiras,Miguel Vigil,Alejandro Rodríguez de Castro 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.7
The present study focuses on the numerical modelling of gas-jet wiping process. Many processes involving liquids are necessary during steel manufacturing, such as cooling, lubrication or cleaning. Satisfactory processes for removing the liquid are critical for the quality of the product obtained as well as for avoiding a product rejection in strip lines such as tandem mills and tinning lines. One the most widespread drying technology used is based on planar air-knives or nozzle rows which wipe the liquid out from the steel strip by creating an aerodynamic barrier. The objective of this paper is to analyze the performance of a simple air knife based on an inclined planar jet that is commonly used in many commercial or in-house built devices. A CFD model developed by using commercial software ANSYS FLUENT® was built in order to evaluate the wiping system depending on the type of feeding: central and lateral.
Jaqueline Correia Villac¸a,Luiz Cla´udio R. Pereira da Silva,Luisa Helena Falca˜o Barbosa,Carlos Rangel Rodrigues,Luiz Marcelo Lira,Fla´ via Almada do Carmo,Valeria Pereira de Sousa,Maria Ineˆs Bruno 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.6
The purpose of this study was to prepare and characterize lamellar silicate nanocomposites usingexfoliation processes, high clay load and polyvinylpyrrolidone (PVP), ethylcellulose (EC) andpolyquaternium-H (PQH). The clays (sodium montmorillonite, Viscogel S4TM, S7TM and B8TM) werepre-treated with ultrasonic energy in order to increase clay exfoliation yields. Polymeric nanocompositeswere characterized by XRPD, DSC, TGA, DLS and NMR. The results revealed a new exfoliationmethod and new intercalated nanocomposites. High clay load was used to obtain the nanocomposites,which enables its application at an industrial scale. These nanocomposites could be broadly appliedacross the pharmaceutical, medical and food industries.
Marwa Khammassi,Maud Miguet,Valérie Julian,Charlotte Cardenoux,Yves Boirie,Martine Duclos,Bruno Pereira,David Thivel 대한비만학회 2020 The Korean journal of obesity Vol.29 No.4
Background: To evaluate the impact of 4 months of a high-intensity interval training (HIIT)-centered weight-management intervention on health-related quality of life (HR-QOL), health perception (HP) and physical self-perception (PSP) in adolescents with obesity. Methods: Fifty-six adolescents with obesity (28 girls; mean body mass index [BMI], 35±4.89 kg/m2; z-BMI, 2.3±0.3; 11–17 years) followed a multidisciplinary weight-management intervention composed of nutritional counseling, HIIT program, and health-related therapeutic education. Anthropometric parameters, body composition (dual X-ray absorptiometry), and maximal aerobic capacities (maximal oxygen consumption [VO2peak]) were assessed, and self-reported questionnaires were used to assess HR-QOL (36-item short form survey), HP and PSP at baseline (T0) and post-intervention (T1). Results: Body weight (92.6±18.9 to 85.9±16.2 kg), BMI (35.0±4.8 to 32.1±4.5 kg/m²), z-BMI (2.3±0.3 to 2.1±0.3) and fat mass percentage (36.0%±9.1% to 30.4%±7.8%) were significantly decreased (P<0.001) between T0 and T1. There was a tendency for VO2peak to increase from 26.35±5.81 mL/kg/min at T0 to 28.79±6.59 mL/kg/min at T1 (P=0.06). Physical functioning (P=0.002), physical limitation (P=0.048), general health (P<0.001) and bodily pain (P=0.030) were improved at T1. A significant improvement occurred in dimensions of HP such as physical condition (P=0.001), adiposity (P<0.001), alimentation (P<0.001), general health (P=0.038), and perceived general health (P=0.001). In addition, there was an improvement in items of PSP such as self-perceived coordination (P=0.022), endurance (P=0.001) and activity (P=0.001), global self-concept (P=0.015), and appearance (P=0.016). Physical but not mental HR-QOL domains, HP and PSP were associated with weight reduction. Conclusion: While HIIT favors improved HR-QOL, HP status and PSP in adolescents with obesity, physical but not mental HR-QOL, HP and PSP were associated with weight reduction.
( Colussi Francieli ),( Viviane Serpa ),( Priscila Da Silva Delabona ),( Livia Regina Manzine ),( Maria Luiza Voltatodio ),( Renata Alves ),( Bruno Luan Mello ),( Nei Pereira Jr. ),( Cristiane Sanches 한국미생물 · 생명공학회 2011 Journal of microbiology and biotechnology Vol.21 No.8
Because of its elevated cellulolytic activity, the filamentous fungus Trichoderma harzianum has a considerable potential in biomass hydrolysis applications. Trichoderma harzianum cellobiohydrolase I (ThCBHI), an exoglucanase, is an important enzyme in the process of cellulose degradation. Here, we report an easy single-step ion-exchange chromatographic method for purification of ThCBHI and its initial biophysical and biochemical characterization. The ThCBHI produced by induction with microcrystalline cellulose under submerged fermentation was purified on DEAE-Sephadex A-50 media and its identity was confirmed by mass spectrometry. The ThCBHI biochemical characterization showed that the protein has a molecular mass of 66 kDa and pI of 5.23. As confirmed by smallangle X-ray scattering (SAXS), both full-length ThCBHI and its catalytic core domain (CCD) obtained by digestion with papain are monomeric in solution. Secondary structure analysis of ThCBHI by circular dichroism revealed α- helices and β-strands contents in the 28% and 38% range, respectively. The intrinsic fluorescence emission maximum of 337 nm was accounted for as different degrees of exposure of ThCBHI tryptophan residues to water. Moreover, ThCBHI displayed maximum activity at pH 5.0 and temperature of 50℃ with specific activities against Avicel and p-nitrophenyl-β-D-cellobioside of 1.25 U/mg and 1.53 U/mg, respectively.
Thaynã Ramos Flores,Ana Paula dos Santos Rodrigues,Rosália Garcia Neves,Sandro Rodrigues Batista,Doralice Severo da Cruz Teixeira,Erika Aparecida da Silveira,Deborah Carvalho Malta,Bruno Pereira Nunes 대한비만학회 2021 The Korean journal of obesity Vol.30 No.2
Background: An increase in body mass index (BMI) is strongly associated with the occurrence of multimorbidity, and overweight and obesity are contributing factors for the increase in morbidities. Thus, the present study aimed to evaluate the occurrence of multimorbidity and associated factors in Brazilian adults with and without overweight or obesity. Methods: This was a cross-sectional population-based study with data from the National Health Survey (2013) including individuals aged 18 years or older. Multimorbidity was defined as having ≥2 diseases from the list of 15 morbidities on the self-reported questionnaire (self-reported medical diagnosis in life). BMI was categorized as: ≤24.9 kg/m2 (low weight and eutrophy), 25.0–29.9 kg/m2 (overweight), and ≥30.0 kg/m2 (obesity). Sex, age, and schooling were the covariates. Poisson regression was used for crude and adjusted analyses for the variables representing access to health services estimating the prevalence ratio (PR) and 95% confidence interval (CI). Results: The total sample consisted of 59,402 individuals. The prevalence of multimorbidity was 25% overall and was higher among overweight (25.8%) and obese (32.5%) individuals. Obese women 60 years or older had a higher occurrence of multimorbidity (80%). In the adjusted analysis, a lower prevalence of multimorbidity was observed among those with higher educational levels in all BMI classifications: low weight/eutrophy, PR=0.66 (95% CI, 0.58–0.75); overweight, PR=0.62 (95% CI, 0.56–0.70); and obesity, PR=0.75 (95% CI, 0.67–0.85). Conclusion: A higher prevalence of multimorbidity was found among obese women who were 60 years of age or older. Schooling was an associated factor regardless of BMI.