Preparação dos catalisadores MoO3/MCM-41 e MoO3/SBA-15 com fontes alternativas de sílica destinados à reação de transesterificação do óleo de soja.

Este trabalho teve como objetivo sintetizar as peneiras moleculares MCM-41 e SBA-15, utilizando fontes alternativas de sílica, e preparar os catalisadores MoO3/MCM-41 e MoO3/SBA-15 e avaliar seu potencial catalítico na reação de transesterificação de óleo de soja para produção de biodiesel. As peneiras moleculares MCM-41 e SBA-15 foram sintetizadas empregando TEOS, argila chocolate B, cinzas de casca de arroz e pó de vidro como fontes de sílica. As fontes alternativas de sílica foram previamente dissolvidas em solução de NaOH (1 mol.L-1) a 100ºC por 6 horas. Em seguida, as misturas foram filtradas, e os filtrados contendo sílica dissolvida foram armazenados para posterior utilização nas sínteses das peneiras moleculares. As sínteses da MCM-41 ocorreram em duas etapas, o envelhecimento térmico ocorreu a 28 ºC por 2 horas e as sínteses hidrotérmicas ocorreram a 150 ºC por 96 horas. As sínteses da SBA-15 foram realizadas em duas etapas, o envelhecimento térmico ocorreu a 35 ºC por 24 horas e as sínteses hidrotérmicas ocorreram a 100 ºC por 48 horas. Os produtos das sínteses foram, lavados com água destilada e secos a 60 ºC por 24 horas. A deposição do MoO3 sobre os suportes MCM-41 e SBA-15 foi realizada por meio de impregnação úmida utilizando-se solução aquosa de Heptamolibdato de Amónio (0,1 mol.L-1), seguida de calcinação. As matérias-primas, assim como as peneiras moleculares e os catalisadores foram caracterizadas por Difração de raios X (DRX), Espectroscopia de Fluorescência de Raios X por Energia Dispersiva (FRX-ED), Microscopia eletrônica de Varredura (MEV) e Espectroscopia na Região de Infravermelho por Transformada de Fourier (FTIR). Os catalisadores foram avaliados na reação de transesterificação do óleo de soja com etanol em reator batelada sem agitação, com temperatura de 100 ºC durante 3 horas. Os resultados de DRX e FRX-ED das fontes de sílica mostram que todas são compostas por sílica amorfa e cristalina, evidenciando o potencial dos materiais. Os resultados de DRX, MEV e FTIR das peneiras moleculares mostraram a eficácia dos processos de síntese da MCM-41 e SBA-15 e dos catalisadores MoO3/MCM-41 e MoO3/SBA-15 com todas as fontes de sílica. Os biodieseis obtidos foram caracterizados utilizando técnicas de determinação de massa específica, viscosidade cinemática e índice de acidez. Os produtos gerados evidenciaram o poder catalítico dos catalisadores, porém revelaram que as condições reacionais empregadas são insuficientes para produção de biodiesel B100.The study aimed to synthesize the MCM-41 and SBA-15 molecular sieves, using alternative silica sources, and to prepare the MoO3/MCM-41 and MoO3/SBA-15 catalysts and to evaluate their catalytic potential in the transesterification reaction of soybean for biodiesel production. The MCM-41 and SBA-15 molecular sieves were synthesized using TEOS, chocolate B clay, rice husk ash and glass powder as silica sources. The molecular sieves were synthesized using a hydrothermal method. Alternative silica sources were previously dissolved in NaOH solution (1 mol.L-1), filtered and the filtrates containing silica in the liquid phase were stored for further use in the molecular sieve synthesis. The MCM-41 synthesis occurred in two steps, the thermal ageing occurred at 28 °C for 2 hours and the hydrothermal synthesis occurred at 150 °C for 96 hours. The SBA-15 synthesis occurred in two steps, the thermal ageing occurred at 35 °C for 24 hours and the hydrothermal synthesis occurred at 100 °C for 48 hours. The synthesis products were washed with distilled water, filtered, dried at 60 °C for 24 hours and calcined at 550 °C for 7 hours.The MoO3 deposition on MCM-41 and SBA-15 support was performed by means of wetness impregnation using an aqueous solution of 0,1 mol.L-1 Ammonium Heptamolybdate. After the impregnation process, the material was subjected to calcination. The samples were characterized by X-ray diffraction (XRD), Energy Dispersive X-Ray Fluorescence Spectroscopy (ED-XRF), Scanning Electron Microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FTIR). The catalysts were evaluated in the transesterification reaction of soybean oil with ethanol in a batch reactor without stirring at 100 ° C for 3 hours. The results of XRD and ED-XRF of the silica sources show that all are composed of amorphous and crystalline silica, evidencing the potential of the materials. The results of XRD, SEM and FTIR of the molecular sieves showed the efficiency of the synthesis of MCM-41 and SBA-15 and MoO3/MCM-41 and MoO3/SBA-15 catalysts with all silica sources. The biodiesel were characterized using techniques for determining specific mass, kinematic viscosity and acid index. The products generated evidenced the catalytic power of the catalysts, but revealed that the reaction conditions employed are insufficient for the production of B100 biodiesel.Cape

A case of envenomation by neotropical Opisthoglyphous snake Thamnodynastes pallidus (Linnaeus, 1758) (Colubridae: Dipsadinae: Tachymenini) in Brazil

This is a case report of a bite by an Opisthoglyphous snake Thamnodynastes pallidus (Linnaeus, 1758) in an undergraduate herpetologist observed at the Universidade Federal da Paraiba (Rio Tinto, PB, Brazil). The female victim was bitten in her left hand between the index finger and the middle finger and presented symptoms of local envenomation such as bleeding, itching, pain in the wound and swelling. The patient was first seen at the University and afterwards at home during the 36 hours following the incident, when the symptoms disappeared. This is the first case report of an accident by T. pallidus in a human being in Brazil

Using dynamic capabilities to cope with digital transformation and boost innovation in traditional banks

Financial institutions operate in a competitive, complex, and uncertain environment. A series of changes—many accelerated by the COVID-19 pandemic—demand innovative movements from the organizations that operate in the sector. The emergence of new business models (e.g., fintecs) requires a realignment of the capabilities of traditional organizations, such as banks. Indeed, internal adaptations and the formulation of market strategies focused on a digital user are part of the current narrative. But how can it be executed? This article explores the relationship between dynamic capabilities and digital transformation. In summary, we present insights about how dynamic capabilities can drive innovation in traditional financial institutions based on the challenges brought by digital transformation. Starting from a Brazilian case study, we identified that external and internal contextual factors—especially the political-legal environment and cultural and governance issues—are necessary for stimulating the dynamic capabilities that should be addressed for digital transformation. Finally, we propose a framework that summarizes how dynamic capabilities enable the guidance of traditional banks amid challenges caused by digital transformation

Drosophila melanogaster - an embryonic model for studying behavioral and biochemical effects of manganese exposure

Embryonic animals are especially susceptible to metal exposure. Manganese (Mn) is an es-sential element, but in excess it can induce toxicity. In this study we used Drosophila mela-nogaster as an embryonic model to investigate biochemical and behavioral alterations due to Mn exposure. Flies were treated with standard medium supplemented with MnCl2 at 0.1 mM, 0.5 mM or 1 mM from the egg to the adult stage. At 0.5 mM and 1 mM Mn, newly ecloded flies showed significantly enhanced locomotor activity when assessed by negative geotaxis behavior. In addition, a significant increase in Mn levels (p < 0.0001) was observed, while Ca, Fe, Cu, Zn and S levels were significantly decreased. A significant drop in cell viability occurred in flies exposed to 1 mM Mn. There was also an induction of reactive oxygen species at 0.5 mM and 1 mM Mn (p < 0.05). At 1 mM, Mn increased Catalase (p < 0.005), Superoxide Dismutase (p < 0.005) and Hsp83 (p < 0.0001) mRNA expression, without altering Catalase or Superoxide Dismutase activity; the activity of Thioredoxin reductase and Glutatione-S-transferase enzymes was increased. Mn treatment did not alter ERK or JNK1/2 phosphorylation, but at 1 mM caused an inhibition of p38MAPK phosphorylation. Together these data suggest mechanisms of adaptation in the fly response to Mn exposure in embryonic life

Fecal eukaryotic community of wild young South American (Arctocephalus australis) and Subantarctic fur seals (Arctocephalus tropicalis)

Eukaryotic microbes that reside in the mammalian gut have an important role in maintaining metabolism, digesting nutrients, and regulating the immune system. Therefore, changes in the microbial composition of the gut may generate adverse impacts on animal health. Using high-throughput sequencing, the present study examined the fecal eukaryotic community of wild young South American (Arctocephalus australis) (n = 2) and Subantarctic fur seals (Arctocephalus tropicalis) (n = 3). The results indicated there was a distinct and diverse eukaryotic community in the fecal samples of young wild fur seals. Perhaps based on the migratory habits of certain species and the difficulty in obtaining samples, the microbiota of wild animals is poorly understood. This work reports a number of phyla and classes of microorganisms never noticed in the fecal samples of wild fur seals before and provide insight into the fecal eukaryotic community of wild young South American and Subantarctic fur seals

Obturação protética palatina implantossuportada na reabilitação de sequela de carcinoma adenóide cístico: relato de caso

Introduction: Adenoid cystic carcinoma (CAC) is a rare tumor and has a high potential for metastasis. In situations where the tumor has a critical location, such as in the case of the palate, surgical removal can be extremely invasive and mutilating, generating sequelae that result in functional and aesthetic damage to the patient.Objective: Report the clinical case of making an implant-supported palatal prosthetic obturation for the treatment of a patient with buccal-nasal communication resulting from CAC removal surgery.Case Report:A 33-year-old female patient sought dental care 6 months after the removal of a CAC in the nasopalatal region, for the rehabilitation of oral-nasal communication. To correct this communication, an immediate obturator prosthesis, retained by implants, was made using the Barra-Clip system. For that, there was the installation of osseointegrated implants, conventional and zygomatic, in addition to the manufacture of a metal bar for fixation of the prosthesis. With the made palatal prosthesis, two Clips were captured with self-curing acrylic resin. After making and installing the prosthesis, the patient was followed-up monthly for six months.Conclusion:Maxillofacial prostheses are effective in the rehabilitation of sequelae resulting from surgical treatment in cancer patients. The use of osseointegrated implants and the Barra-Clip system are good alternatives for the construction of pillars supporting these devices, providing stability and retention.Introdução: O carcinoma adenoide cístico (CAC) é um tumor raro e apresenta alto potencial de metástase. Em situações na qual o tumor possui localização crítica, como no caso do palato, a remoção cirúrgica pode ser extremamente invasiva e mutilante, gerando sequelas que resultam em prejuízos funcionais e estéticos ao paciente. Objetivo: Relatar o caso clínico de confecção de prótese obturadora de palato implantossuportada para o tratamento de um paciente com comunicação buco-nasal decorrente da cirurgia de remoção de CAC. Relato de Caso: Paciente de 33 anos, sexo feminino, procurou atendimento odontológico 6 meses após a remoção cirúrgica de um CAC em região nasopalatal, para reabilitação de comunicação buco-nasal. Para correção desta comunicação, foi realizada a confecção de uma prótese obturadora imediata, implantossuportada, com o sistema Barra-Clip. Para isso, houve a instalação de implantes osseointegrados, convencional e zigomático, além de confecção de uma barra de metal para fixação da prótese. Com a prótese palatina confeccionada, realizou-se a captura de dois Clips com resina acrílica autopolimerizável. Após a confecção e instalação da prótese, a paciente foi acompanhada mensalmente durante seis meses. Conclusão: As próteses bucomaxilofaciais são eficazes na reabilitação das sequelas advindas do tratamento cirúrgico em pacientes oncológicos. A utilização de implantes osseointegrados e sistema Barra-Clip se mostram como boas alternativas para a confecção de pilares de sustentação desses dispositivos, conferindo estabilidade e retenção

Valorization of solid waste (sugarcane bagasse ash) with applications in synthesis of zeolite NaA / Valorização de resíduos sólidos (cinza de bagaço de cana) com aplicações em síntese de zeólita NaA

Os resíduos gerados pelas indústrias são freqüentemente negligenciados e descartados em aterros sanitários. Porém, a reciclagem desses resíduos, além de ser ecologicamente interessante, pode gerar é interessante por ser uma rota ambientalmente correta e de valor agregado para a conservação e reciclagem de recursos. Neste trabalho, resíduos ricos em sílica, cinza do bagaço de cana-de-açúcar foram investigados como potenciais reagentes verdes para a síntese da zeólita NaA. A cinza do bagaço da cana-de-açúcar (CBCA) como resíduo da usina de cana-de-açúcar foi extraída para o pó de sílica. Antes de ser usada, a CBCA foi ativada com solução de H2SO4. A extração da sílica foi conduzida usando concentração de NaOH (1 mol/L), bem como tempo de extração (6 h). A solução foi filtrada através de papel de filtro e o filtrado foi usado como fonte de sílica. A zeólita NaA foi sintetizada usando cinza do bagaço de cana-de-açúcar tratada como fonte de sílica sob condição hidrotérmica a 90 oC por 7 h. A CBCA e a zeólita NaA sintetizada foram analisadas por Fluorescência de Raios-X por Energia Dispersiva (FRX), Difração de Raios X (DRX) e espectroscopia na região do infravermelho (IV). O resultado indicou que a quantidade de SiO2 presente na cinza do bagaço da cana-de-açúcar foi de 49,16 %, enquanto a composição da sílica na amostra ativada com ácido foi de 90,91 % e na amostra após ativação básica foi de 71,08 %. A análise de DRX evidenciou que a NaA apresentou uma estrutura LTA bem definida. O espectro de IV confirmou a formação da zeólita NaA. As bandas de vibração em 557 cm-1 sugerem a presença de estrutura de zeólita A de quatro anéis duplos (D4R)

Sensory profile evaluation of light peach tea

In this work, three different brands of light peach iced tea (A, B and C), purchased in a local market and packed in PET bottles were sensory analyzed. At first, Quantitative Descriptive Analysis (QDA) was conducted in order to obtain the sensorial profile, with eleven tasters, previously selected and trained. The product acceptance was evaluated by 33 consumers, representing the target public. The QDA results were submitted to ANOVA, Tukey's test and Principal Component Analysis (PCA). The sample A was mainly characterized by banana aroma and flavor; the sample B by artificial peach aroma and refreshment; while the sample C by sweetness and natural peach aroma. The acceptance test, analyzed by ANOVA and Tukey's test, showed a greater acceptance for the sample C. The colour of the samples was evaluated by the Cielab L*a*b* method and the sample C stood out by the red colour.No presente estudo foi determinado o perfil sensorial e a aceitação de três marcas comerciais de chá light sabor pêssego, denominadas A, B e C, acondicionadas em embalagem PET e adquiridas no comércio local. O perfil sensorial foi determinado por Análise Descritiva Quantitativa (ADQ) utilizando-se uma equipe de 11 provadores rigorosamente selecionados e treinados. A aceitação dos produtos foi avaliada por 33 consumidores representativos do público alvo. Os resultados da ADQ foram submetidos à Análise de Variância (ANOVA), Teste de Média de Tukey e Análise de Componentes Principais. As amostras comerciais apresentaram perfis semelhantes em alguns termos descritores e diferenças significativas em outros. A amostra A caracterizou-se principalmente pelos atributos aroma e sabor de banana passa; a amostra B por aroma artificial de pêssego e refrescância; e a amostra C por aroma natural de pêssego e doçura. O Teste Afetivo, analisado por ANOVA e Teste de Média de Tukey, indicou maior aceitação para a amostra C. A cor das amostras foi avaliada pelo método Cielab L*a*b*, sendo que a amostra C se destacou das demais pela cor vermelha.10210

Panorama das Intervenções Coronárias Percutâneas em Oclusões Totais Crônicas em Centros Participantes do LATAM CTO Registry no Brasil

Background: Major advances have been seen in techniques and devices for performing percutaneous coronary interventions (PCIs) for chronic total occlusions (CTOs), but there are limited real-world practice data from developing countries. Objectives: To report clinical and angiographic characteristics, procedural aspects, and clinical outcomes of CTO PCI performed at dedicated centers in Brazil. Methods: Included patients underwent CTO PCI at centers participating in the LATAM CTO Registry, a Latin American multicenter registry dedicated to prospective collection of these data. Inclusion criteria were procedures performed in Brazil, age 18 years or over, and presence of CTO with PCI attempt. CTO was defined as a 100% lesion in an epicardial coronary artery, known or estimated to have lasted at least 3 months. Results: Data on 1196 CTO PCIs were included. Procedures were performed primarily for angina control (85%) and/or treatment of moderate/severe ischemia (24%). Technical success rate was 84%, being achieved with antegrade wire approaches in 81% of procedures, antegrade dissection and re-entry in 9%, and retrograde approaches in 10%. In-hospital adverse cardiovascular events occurred in 2.3% of cases, with a mortality rate of 0.75%. Conclusions: CTOs can be treated effectively in Brazil by using PCI, with low complication rates. The scientific and technological development observed in this area in the past decade is reflected in the clinical practice of dedicated Brazilian centersinfo:eu-repo/semantics/publishedVersio

Métodos diagnósticos de Toxoplasmose Congênita: revisão de literatura

&nbsp;This article aims to evaluate the diagnostic methods for congenital toxoplasmosis. This is an integrative review using the VHL, SciELO, LILACS and PubMed as databases over the last 5 years. 272 articles on the topic were evaluated with an emphasis on a synthesis of the most recent knowledge and greater scientific consistency. We found that, despite the performance of real-time PCR, it is relevant to consider less invasive methods, as it depends on amniocentesis.Este artigo tem por objetivo avaliar os métodos diagnósticos de toxoplasmose congênita. Trata-se de uma revisão integrativa utilizando como base de dados a BVS, a SciELO, o LILACS e o PubMed, nos últimos 5 anos. Foram avaliados 272 artigos sobre o tema com ênfase em uma síntese dos conhecimentos mais recentes e de maior consistência científica. Verificamos que, apesar do desempenho da PCR em tempo real, é relevante considerar métodos menos invasivos, visto que depende de amniocentese