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au:ANTUNES, M. C.

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Heat transfer in Oxisol in heat storage process
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Sanches, Édipo S.

; Sanches, Ítalo S.

; Jordan, Rodrigo A.

; Omido, Agleison R.

; Motomiya, Anamari V. de A.

; Barboza, Christian S.

; Santos, Rodrigo C.

; Antunes, Bruno M.

Revista Brasileira de Engenharia Agrícola e Ambiental

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jul 2023, Volume 27 N. 7 Pages 512 - 520

Abstract: En Pt | Text: En Pt | PDF: En | PDF: Pt

ABSTRACT Geothermal energy is a renewable source that can assist in the thermal conditioning of constructed environments. The objective of this study was to analyze the heat transfer in a Red Latosol (Oxisol), in heat storage process, using two linear heat exchangers. The treatments were arranged in a 3 × 2 × 3 factorial scheme, corresponding to three temperature differentials between soil and water (5, 10 and 15 °C), two types of materials (PVC and copper) and three radial distances (10, 20 and 25 cm), with three replicates. Soil temperature variations were obtained continuously for a period of 12 hours using DS18B20 sensors. These variations were logarithmic as a function of heat transfer time and radial distance and linear as a function of the temperature differential between soil and water (θ). The temperature differential between soil and water was the main factor that influenced soil temperature variation, and the material employed was insignificant in this variation. The minimum distance between heat exchangers should be greater than 50 cm, and PVC pipes proved to be more attractive for use involving thermal exchange with the ground as they are more viable than copper and easier to implement.

RESUMO A energia geotérmica é uma fonte renovável que pode auxiliar no condicionamento térmico de ambientes construídos. O objetivo deste estudo foi analisar a transferência de calor em um Latossolo Vermelho (Oxisol), em processo de armazenamento de calor, utilizando dois trocadores de calor lineares. Os tratamentos foram dispostos em esquema fatorial 3 × 2 × 3, correspondendo a três diferenciais de temperatura entre solo e água (5, 10 e 15 °C), dois tipos de materiais (PVC e cobre) e três distâncias radiais (10, 20 e 25 cm), com três repetições. As variações de temperatura do solo foram obtidas continuamente por um período de 12 horas usando sensores DS18B20. Essas variações foram logarítmicas em função do tempo de transferência de calor e da distância radial, e lineares em função do diferencial de temperatura entre o solo e a água (θ). O diferencial de temperatura entre o solo e a água foi o principal fator que influenciou na variação da temperatura do solo, sendo que o material empregado foi insignificante nessa variação. A distância mínima entre os trocadores de calor deve ser maior que 50 cm, e os tubos de PVC se mostraram mais atrativos para uso envolvendo troca térmica com o solo por serem mais viáveis que os de cobre e mais fáceis de serem executados.

https://doi.org/10.1590/1807-1929/agriambi.v27n7p512-520

Diversity of eukaryotic and prokaryotic microbiota revealed by metabarcoding in Neotropical floodplain lakes
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TARGUETA, CÍNTIA P.

; ANTUNES, ADRIANA M.

; MACHADO, KARINE B.

; FERNANDES, JORDANA G.

; TELLES, MARIANA P. DE C.

; VIEIRA, LUDGERO C. GALLI

; LOGARES, RAMIRO

; NABOUT, JOÃO C.

; SOARES, THANNYA N.

Anais da Academia Brasileira de Ciências

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2023, Volume 95 Suppl. 1 elocation e20201578

Abstract: En | Text: En | PDF: En

Abstract The diversity of eukaryotic and prokaryotic communities has been assessed by morphological and genetic approaches, which are used to characterize the microbiota in different environments. Here, planktonic prokaryotic and eukaryotic communities of the Araguaia River, located in the Central region of Brazil, were analyzed based on metabarcoding analysis of rRNA genes to evaluate the diversity of these groups in tropical floodplain lakes. Also, we tested their spatial concordance throughout the Araguaia river. Water samples were collected from 8 floodplain lakes in Araguaia River. The 16S and 18S rRNA genes were amplified and sequenced using Illumina MiSeq. For eukaryotes, 34,242 merged reads were obtained and 225 distinct OTUs were delineated, of which 106 OTUs were taxonomically classified. For prokaryotes, 26,426 sequences were obtained and 351 OTUs were detected. Of them, 231 were classified in at least one taxonomic category. The most representative eukaryotes belonged to Ciliophora, Chlorophyta and Charophyta. The prokaryotic phylum with the most OTUs classified were Proteobacteria, Actinobacteria and Bacteroidetes. The lakes did not show spatial concordance when comparing the similarity between their microbiota. The knowledge of freshwater biodiversity using DNA sequencing for important rivers, such as Araguaia River, can improve microbiota inventories of tropical biodiversity hotspots.

https://doi.org/10.1590/0001-3765202320201578

Cais-do-Sodré Té Salamansa: Existências à margem nos contos de Orlanda Amarilis
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Antunes, Susana L. M.

; Guimarães, Maria C. O.

Faces de Eva. Estudos sobre a Mulher

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dec 2022, N. 48 Pages 98 - 112

Abstract: En Pt | Text: En Pt | PDF: En | PDF: Pt

Abstract This paper aims to reread and rethink the short story collection Cais-do-Sodré Té Salamansa (1974) by the Cape Verdean writer Orlanda Amarilis (1942-2014). The revisitation is motivated by the actuality of the issues that, after forty-eight years, remain to arouse interest in issues that are still being discussed. On this journey, emphasis is placed on the permanence of a continuum of marginalized existences, intensified by the images of Cape Verdean women located/besieged inside, or outside the ten islands. In this context, is the present study intends to highlight the charisma of resistance being shaped by patchwork lives and disenchantment revitalized by memory.

Resumo O presente trabalho propõe uma revisitação ao livro de contos Cais-do-Sodré Té Salamansa (1974), da escritora cabo-verdiana Orlanda Amarilis (1942-2014), provocada pela atualidade das questões que, passados quarenta e oito anos à data da escrita do presente estudo, continuam a despertar interesse. Neste percurso, enfatiza-se a permanência in continuum de existências à margem, intensificadas pelas imagens da mulher cabo-verdiana situada/sitiada dentro ou fora das dez ilhas. Neste contexto, pretende-se realçar o carisma destes seres de resistência, enformado por vidas em retalhos e pelo desencanto revitalizado pela memória.

https://doi.org/10.34619/n15y-imnj

Antibacterial Profile in vitro and in vivo of New 1,4-Naphthoquinones Tethered to 1,2,3-1H-Triazoles Against the Planktonic Growth of Streptococcus mutans
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Gomes, Mônica P.

; Correia, Eduardo M.

; Gomes, Max W. L.

; Santos, Claudio C. C. dos

; Barros, Caroline S.

; Abreu, Fernanda V. de

; Antunes, Leonardo S.

; Ferreira, Vitor F.

; Gonçalves, Mariana C.

; Resende, Gabriel O. de

; Gonzaga, Daniel T. G.

; Pinto, Carla E. C.

; Paixão, Izabel C. N. P.

; Silva, Fernando C. da

Journal of the Brazilian Chemical Society

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sep 2022, Volume 33 N. 9 Pages 1028 - 1040

Abstract: En | Text: En | PDF: En

The cariogenic processes are mainly caused by the bacterium Streptococcus mutans (S. mutans) and consist of the demineralization of the tooth that occurs when the acid production overcomes the natural repair or if a problem occurs in the last one. In this work, we performed the synthesis of twenty-one 1,4-naphthoquinones tethered to 1,2,3-1H-triazoles (8a-8k and 9a-9j), antibacterial evaluation against the S. mutans in vitro and the acute toxicity of the better ones in vivo. We observed strong inhibition results in the disc diffusion test ranging, the halos of inhibitions, from 18.66 (± 0.57) to 29 (± 2.64) mm, and good values in the minimum inhibitory concentration (5 to 50 μg), for the compounds 9e, 9h, 9i and 9j: Furthermore, they do not have a cytotoxic effect at the concentrations tested. Besides that, in the in vivo test, they show some slight alteration in the histopathological analyses and the biochemistry. Thus, we found four potential candidates to become instruments for the treatment of cavities.

https://doi.org/10.21577/0103-5053.20220014

ELECTRICAL PERFORMANCE OF A WATER-COOLED PVT SYSTEM WITH FORCED AND NATURAL CIRCULATION
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Antunes, Bruno M.

; Jordan, Rodrigo A.

; Motomiya, Anamari V. de A.

; Santos, Rodrigo C.

; Moreira Júnior, Orlando

Engenharia Agrícola

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2022, Volume 42 N. spe elocation e20220108

Abstract: En | Text: En | PDF: En

ABSTRACT This study evaluated the electrical performance of a photovoltaic-thermal (PVT) system using water as a cooling fluid (PVT/w), with adaptation, in a photovoltaic module of a device for heating water without direct contact with the cell and with air as the secondary working fluid. The PVT/w system with forced and natural circulation was compared in a regime of thermal accumulation of hot water and supply by a boiler reservoir relative to the same PV panel with the original factory characteristics. The average system temperature, open circuit voltage, current and voltage with load, and generated electric power were analyzed during seven non-consecutive days, with ten repetitions every thirty minutes between 9:30 am and 2:00 pm in the city of Dourados-MS, Brazil, between June and July 2021. The PVT system with forced circulation (PVT/w_CB) presented the best electrical performance compared to the PVT system with natural circulation (PVT/w_SB), in the order of 3.7%.

https://doi.org/10.1590/1809-4430-eng.agric.v42nepe20220108/2022

Enfermedad arterial coronaria y sus características clínico-angiográficas: Realidad de un centro de atención terciaria privado en Angola
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Antunes Vicente, Miguel B.

; Méndez Peralta, Tomás C.

; de Lima Domingos, Luis M.

; Ravelo Dopico, Roger

; de las Mercedes Pradez, Guillermo

; Saraiva Martins, Telmo

; Bunda Ricardo, José R.

; Cordeiro, Lemuel

; Filipe Júnior, António P.

CorSalud

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sep 2021, Volume 13 N. 3 Pages 299 - 310

Abstract: En Es | Text: En Es | PDF: En | PDF: Es

ABSTRACT Introduction: Coronary artery disease has progressively increased among Angolans due to the epidemiological transition resulting from new lifestyles unfavorable to cardiovascular health. Objective: To perform a clinical-angiographic characterization of patients suspected of coronary artery disease undergoing coronary angiography. Method: Retrospective observational study, conducted at Clínica Girassol, with 450 patients who underwent coronary angiography from January 2012 to December 2018. Clinical variables such as sex, age, type of procedure, risk factors, clinical indication, and angiographic features (access route, vessels involved, coronary dominance, treatment strategy and complications) were included. Results: Male sex predominated (71.6%) with a mean age of 59.7±11.2 years. Hypertension was the predominant risk factor (76.0%). Emergency procedures accounted for 56.2% of the interventions; ST-segment elevation acute coronary syndrome (37.3%) was the most frequent. Most of the procedures (81.1%) were performed via the femoral artery. The left anterior descending artery was involved in 37.6% of the cases and right dominance was the most prevalent (94.0%). Femoral hematoma was the most frequent complication (0.9%). Conclusions: The patients who underwent surgery were predominantly male, older, hypertensive, and required urgent procedures, mostly for ST-segment elevation acute coronary syndromes, with very low rates of complications.

RESUMEN Introducción: La enfermedad arterial coronaria ha experimentado un aumento entre los angolanos debido a la transición epidemiológica resultante de los nuevos estilos de vidas desfavorables para la salud cardiovascular. Objetivo: Realizar una caracterización clínico-angiográfica de los pacientes con sospecha de enfermedad arterial coronaria llevados a coronariografía. Método: Estudio observacional retrospectivo, realizado en la Clínica Girassol, con 450 pacientes llevados a coronariografía durante enero del 2012 a diciembre del 2018. Se incluyeron variables clínicas (sexo, edad, tipo de procedimiento, factores de riesgo, indicación clínica) y angiográficas (vía de acceso, vasos afectados, dominancia coronaria, estrategia de tratamiento y complicaciones). Resultados: Predominó el sexo masculino (71,6%) con edad media de 59,7(11,2 años. La hipertensión arterial fue el factor de riesgo predominante (76,0%). El 56,2% de los procedimientos fueron realizados de urgencia siendo el síndrome coronario agudo con elevación del ST (37,3%) el más frecuente. La mayoría de los procedimientos (81,1%) fueron por vía femoral. La descendente anterior estuvo afectada en el 37,6% de los casos y la dominancia derecha fue la más prevalente (94,0%). El hematoma femoral constituyó la complicación más frecuente (0,9%). Conclusiones: En los pacientes intervenidos predominó el sexo masculino, las edades avanzadas, la hipertensión arterial y la realización urgente del procedimiento, mayoritariamente por síndromes coronarios agudos con elevación del segmento ST, con muy baja incidencia de complicaciones.

REHYDRATION KINETICS OF DEHYDRATED BERRIES
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Ciolin, Ígor H. de M. R.

; Antunes, Camila W.

; Lenhard, Daiane C.

; Garcia, Carolina C.

Engenharia Agrícola

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may 2021, Volume 41 N. 3 Pages 389 - 395

Abstract: En | Text: En | PDF: En

ABSTRACT Cranberries and blueberries are small fruits known for their antioxidant properties. However, due to their high water content and short shelf life, they are generally marketed as dehydrated berries. The present work aimed to model the rehydration of dehydrated berries. Rehydration tests were conducted at 7 and 29°C using milk as a solvent and at 7, 29, and 45°C when the solvent was water. The mass gain was assessed at different intervals, and the experimental data were fitted to the Fick model considering the berries as spheres. Six empirical/semi-empirical models describing the diffusion of water during drying were used to predict the rehydration process. Fick’s law satisfactorily represented the data, and the highest diffusion coefficients were found when the berries were rehydrated in water at 45°C. Rehydration of berries in milk resulted in nutrient gain as different diffusive flows occurred during the process. The use of empirical models to predict the operating time of the rehydration processes allows flexibility as such models are mathematically simpler than the Fick model. Diffusivity is essential for the design/construction of equipment, and/or process optimization and implementation.

https://doi.org/10.1590/1809-4430-eng.agric.v41n3p389-395/2021 136 downloads

Use and misuse of biomarkers and the role of D-dimer and C-reactive protein in the management of COVID-19: A post-hoc analysis of a prospective cohort study
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Gonçalves, Fabio Augusto Rodrigues

; Besen, Bruno Adler Maccagnan Pinheiro

; Lima, Clarice Antunes de

; Corá, Aline Pivetta

; Pereira, Antônio José Rodrigues

; Perazzio, Sandro Félix

; Gouvea, Christiane Pereira

; Fonseca, Luiz Augusto Marcondes

; Trindade, Evelinda Marramon

; Sumita, Nairo Massakazu

; Duarte, Alberto José da Silva

; Lichtenstein, Arnaldo

; Bonfa, Eloisa

; Utiyama, Edivaldo M.

; Segurado, Aluisio C.

; Perondi, Beatriz

; Miethke-Morais, Anna

; Montal, Amanda C.

; Harima, Leila

; Fusco, Solange R. G.

; Silva, Marjorie F.

; Rocha, Marcelo C.

; Marcilio, Izabel

; Rios, Izabel Cristina

; Kawano, Fabiane Yumi Ogihara

; Jesus, Maria Amélia de

; Kallas, Ésper George

; Carmo, Carolina

; Tanaka, Clarice

; Souza, Heraldo Possolo de

; Marchini, Julio F. M.

; Carvalho, Carlos

; Ferreira, Juliana C.

; Levin, Anna Sara Shafferman

; Oliveira, Maura Salaroli

; Guimarães, Thaís

; Lázari, Carolina dos Santos

; Sabino, Ester

; Magri, Marcello M. C.

; Barros-Filho, Tarcisio E. P.

; Francisco, Maria Cristina Peres Braido

; Costa, Silvia F.

Clinics

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2021, Volume 76 elocation e3547

Abstract: En | Text: En | PDF: En

OBJECTIVE: Coronavirus disease 2019 (COVID-19) is associated with high mortality among hospitalized patients and incurs high costs. Severe acute respiratory syndrome coronavirus 2 infection can trigger both inflammatory and thrombotic processes, and these complications can lead to a poorer prognosis. This study aimed to evaluate the association and temporal trends of D-dimer and C-reactive protein (CRP) levels with the incidence of venous thromboembolism (VTE), hospital mortality, and costs among inpatients with COVID-19. METHODS: Data were extracted from electronic patient records and laboratory databases. Crude and adjusted associations for age, sex, number of comorbidities, Sequential Organ Failure Assessment score at admission, and D-dimer or CRP logistic regression models were used to evaluate associations. RESULTS: Between March and June 2020, COVID-19 was documented in 3,254 inpatients. The D-dimer level ≥4,000 ng/mL fibrinogen equivalent unit (FEU) mortality odds ratio (OR) was 4.48 (adjusted OR: 1.97). The CRP level ≥220 mg/dL OR for death was 7.73 (adjusted OR: 3.93). The D-dimer level ≥4,000 ng/mL FEU VTE OR was 3.96 (adjusted OR: 3.26). The CRP level ≥220 mg/dL OR for VTE was 2.71 (adjusted OR: 1.92). All these analyses were statistically significant (p<0.001). Stratified hospital costs demonstrated a dose-response pattern. Adjusted D-dimer and CRP levels were associated with higher mortality and doubled hospital costs. In the first week, elevated D-dimer levels predicted VTE occurrence and systemic inflammatory harm, while CRP was a hospital mortality predictor. CONCLUSION: D-dimer and CRP levels were associated with higher hospital mortality and a higher incidence of VTE. D-dimer was more strongly associated with VTE, although its discriminative ability was poor, while CRP was a stronger predictor of hospital mortality. Their use outside the usual indications should not be modified and should be discouraged.

https://doi.org/10.6061/clinics/2021/e3547

A sobredotação na Região Autónoma da Madeira: Desenvolvimento de políticas e práticas educativas
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Antunes, Ana P.

; Almeida, Leandro S.

; Miranda, Lúcia C.

; Xavier, Joana O.

; Ramos, Conceição

; Raffan, Johanna M.

Revista Portuguesa de Educação

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jun 2020, Volume 33 N. 1 Pages 121 - 136

Abstract: Es Pt En | Text: Es Pt En | PDF: Es | PDF: Pt | PDF: En

La atención a los estudiantes superdotados y con altas capacidades en la Región Autónoma de Madeira (RAM) se ha mencionado como pionera en el contexto portugués. En este estudio se pretende trazar la evolución de los mecanismos de atención de los niños y adolescentes con altas capacidades en la RAM, con su respectivo marco legal, de lo que viene sucediendo desde los años 90. Los datos fueron recogidos a partir de entrevistas a algunos de los participantes en este proceso y a través de la consulta de documentos disponibles. Así, fue posible organizar el recorrido histórico de la superdotación en Madeira, presentando un breve encuadre del surgimiento del apoyo a la sobredotación y describiendo tres fases secuenciales del mismo: (a) implementación de servicios de atención; (b) consolidación de la prestación de servicios; y (c) servicios prestados en la actualidad. En general, a pesar de la evolución y la modificación de los servicios, la inversión se ha centrado en el proceso de identificación y de intervención, en la formación y en la práctica basada en evidencia, buscando hacer converger las actuaciones con las orientaciones internacionales en el área. Se apuntan algunas reflexiones sobre las políticas públicas en el área de la superdotación, teniendo como premisa la escuela inclusiva y una posible mejora de servicios que pueda facilitar la igualdad de oportunidades y la diferenciación de las prácticas educativas en función de las características y necesidades de cada alumno.

A atenção à sobredotação e a alunos com altas capacidades, na Região Autónoma da Madeira (RAM), tem sido referenciada pelo seu pioneirismo no contexto português. Neste artigo descreve-se a evolução, desde os anos 90, dos mecanismos de atendimento das crianças e adolescentes com elevadas capacidades, e respetivo enquadramento legal. Os dados foram recolhidos a partir de entrevistas a alguns dos intervenientes neste processo e através da consulta de documentos disponíveis. Assim, foi possível organizar o percurso histórico da sobredotação na Madeira, apresentando um breve enquadramento da emergência do apoio à sobredotação e descrevendo três fases sequenciais do mesmo: (a) implementação de serviços de atendimento; (b) consolidação da prestação de serviços; e (c) serviços prestados na atualidade. De uma forma geral, apesar da evolução e modificação dos serviços, o investimento tem-se centrado no processo de identificação e de intervenção, na formação e na prática baseada em evidência, procurando fazer convergir as atuações com as orientações internacionais na área. Apontam-se algumas reflexões sobre as políticas públicas na área da sobredotação, tendo como premissa a escola inclusiva e uma melhoria de serviços que promovam a igualdade de oportunidades e a diferenciação das práticas educativas, em função das características e necessidades de cada aluno.

Attention to giftedness and high ability students, in the Autonomous Region of Madeira (RAM), has been acknowledged for being pioneer in Portugal. The main purpose of this paper is to outline the evolution of practices for high abilities students, and their legal framework, since the 90s, in RAM. Data were collected from interviews with some of the actors in this process and through analysis of available documents. Thus, it was possible to organise the historical path of giftedness in Madeira. So, it is presented a brief framework of the emergence of giftedness educational support and three sequential phases are also described: (a) implementation of support services; (b) consolidation of the provision of services; and (c) current services provided. In general, despite the evolution and modification of the organisation of the services, the investment has been centered on the identification and intervention process, on training and on evidence-based practice, seeking convergence of intervention with international guidelines. Some reflections on public policies about giftedness are pointed out, based on the premise of an inclusive school and a possible improvement of practices that might facilitate equal opportunities and differentiation of educational practices, according to the characteristics and needs of each student.

https://doi.org/10.21814/rpe.18654 86 downloads

10.

Ecotoxicological risk assessment due to the presence of bisphenol A and caffeine in surface waters in the Sinos River Basin - Rio Grande do Sul - Brazil
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Peteffi, G. P.

; Fleck, J. D.

; Kael, I. M.

; Rosa, D. C.

; Antunes, M. V.

; Linden, R.

Brazilian Journal of Biology

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nov 2019, Volume 79 N. 4 Pages 712 - 712

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Resumo Bisfenol A (BPA) é um contaminante emergente regularmente detectado em ecossistemas aquáticos, é considerado um agente modificador endócrino (EDC). Além disso, outro produto químico relacionado com atividade humana, encontrado com frequência nas águas superficiais, é a cafeína. O objetivo deste estudo foi avaliar a ocorrência de risco ecotoxicológico devido a BPA e cafeína em amostras de água da Bacia Hidrográfica do Rio Sinos, Rio Grande do Sul, Brasil. Foram coletadas amostras de água em três locais mensalmente no período de 9 de maio de 2016 a 11 de abril de 2017 (n = 36). As concentrações de BPA em amostras de água coletadas estavam na faixa de não detectada a 517 ng L-1 e concentrações de cafeína na faixa de 41,7 a 28,439,6 ng L-1. A concentração de BPA nas amostras analisadas apresentou correlação moderada com a cafeína (rs = 0,402). Alto risco ecotoxicológico para BPA foi caracterizado em 77,77% das amostras, com 11,11% apresentando médio e 11,1% apresentando baixo risco. Para cafeína 13,9%, 50% e 36,11% das amostras apresentaram risco alto, médio e baixo, respectivamente. Concentrações de cafeína em água podem ser utilizadas como preditoras de concentrações de BPA acima de 10 ng L-1, menor concentração de risco ecotoxicológico, com especificidade de 66,7% e sensibilidade de 70,4%. A avaliação dos riscos aquáticos revelou que ambos os compostos investigados representam risco para os organismos nas águas superficiais estudadas, foz do arroio Pampa, foz do arroio Luiz Rau e ponto de captação para abastecimento público em Lomba Grande.

Abstract Bisphenol A (BPA) is an emerging contaminant, regularly detected in aquatic ecosystems, considered as an endocrine disrupting compound (EDC). Caffeine is another chemical related to human activity, often found in surface waters. The objective of this study was to evaluate the ecotoxicological risk due to BPA and caffeine in water samples from the Sinos River basin, Rio Grande do Sul, Brazil. Water samples were collected at three sites monthly from May 9 th, 2016 to April 11th, 2017 (n = 36). BPA concentrations in water samples collected were in the range of not detected to 517 ng L-1 and caffeine concentrations in the range of 41.7 to 28,439.6 ng L-1. The concentration of BPA in the analyzed samples had a moderate correlation with caffeine (rs = 0.402). High ecotoxicological risk for BPA was characterized in 77.77% of samples, with 11.11% presenting medium and 11.1% presenting low risk. For caffeine 13.9%, 50% and 36.11% of the samples presented high, medium and low risk, respectively. Caffeine concentrations in water can be used as predictors of BPA concentrations above 10 ng L-1, the lower concentration of ecotoxicological risk, with specificity of 66.7% and sensitivity of 70.4%. The assessment of aquatic risks has shown that both investigated compounds pose risks to organisms in the studied surface waters, mouth of the Pampa stream, mouth of the Luiz Rau stream and catchment point for public supply in Lomba Grande.

https://doi.org/10.1590/1519-6984.189752 2228 downloads

11.

Raleio mecânico como alternativa no cultivo de pessegueiros
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Barreto, Caroline F.

; Ferreira, Letícia V.

; Navroski, Renan

; Pereira, José F. M.

; Antunes, Luis E. C.

Revista de Ciências Agrárias

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jun 2019, Volume 42 N. 2 Pages 221 - 230

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Nas principais regiões produtoras de pêssego, o raleio é executado de forma manual, exigindo elevada disponibilidade mão de obra e custo dessa prática. O raleio mecânico pode ser uma alternativa ao raleio manual de frutos. Deste modo, o objetivo deste trabalho foi avaliar a eficiência do raleio mecânico com distintos equipamentos em pessegueiros. O experimento consistiu dos seguintes tratamentos: raleio manual de frutos, raleio mecânico de flores com o equipamento Carpa Electro®, raleio mecânico de flores com o equipamento derriçadeira e raleio mecânico nos frutos com o equipamento derriçadeira. As variáveis avaliadas, a campo foram percentagem de queda de flores e frutos, frutificação efetiva, tempo de raleio, número de frutos por planta, massa média dos frutos e produção por planta. O raleio manual e o raleio mecânico de flores com o equipamento derriçadeira foram eficazes para aumentar a produção e o diâmetro dos frutos. O raleio mecânico de flores e frutos constituem-se como uma alternativa ao raleio manual de pessegueiros, devido à capacidade de remoção e a redução de tempo para a realização da pratica do raleio.

In the major peach producing regions, thinning is performed manually, this practice requires high labor availability and cost. Mechanical thinning may be an alternative to manual fruit thinning. In this way, the objective of this work was to evaluate the efficiency of mechanical thinning with different equipment hand conducted in peach trees. The experiment consisted of the following treatments: hand thinning, mechanical flower thinning with the Carpa Electro® equipment, mechanical flower thinning with the trimming equipment and mechanical thinning of the fruits with the trimming equipment. The variables evaluated in the field were percentage of flower and fruit removed, effective fruiting, thinning time, number of fruits per plant, average fruit mass and yield per plant. The hand thinning and mechanical thinning of the flowers with the trimming equipment are effective to increase the yield and fruit size =. Mechanical thinning of flowers and fruits is an alternative to the manual peach tree thinning, due to the capacity of flower and fruit fall and the reduction of the time to thinning perform practice.

https://doi.org/10.19084/rca.17178 520 downloads

12.

Utilization of gypsum from construction and demolition waste in Portland cement mortar
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Antunes, M. L. P.

; Sá, A. Botignon de

; Oliveira, P. S.

; Rangel, E. C.

Cerâmica

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jan 2019, Volume 65 Suppl. 1 Pages 1 - 6

Abstract: En | Text: En | PDF: En

Abstract Civil construction generates the largest amount of construction and demolition waste (CDW), most of which is not reused and is discarded as inert waste in landfills. The purpose of this study was to evaluate the feasibility of reusing gypsum recovered from CDW in the preparation of mortar. This material was examined to determine its specific mass, morphology, elemental composition and particle size distribution. Test specimens were prepared with a mix design of 1:3 (cement:sand), with the gypsum waste substituting part of sand in proportions of 0, 10, 20 and 30% (in volume). The consistency of the fresh mortar was evaluated: the specimens were tested to determine their flexural and compressive strength, apparent density, water absorption, voids index, and specific mass. After 28 days, the mechanical strength of the specimens exceeded the limits specified by NBR 13281 standard, indicating that up to 30% of ground gypsum waste can be included in a mortar.

https://doi.org/10.1590/0366-6913201965s12588 1340 downloads

13.

Serum biochemical profile of Pêga breed donkeys in the state of Minas Gerais
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Santos, João B.F.

; Franco, Maurício M.

; Antunes, Robson C.

; Guimarães, Ednaldo C.

; Mundim, Antonio V.

Pesquisa Veterinária Brasileira

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jun 2018, Volume 38 N. 6 Pages 1225 - 1231

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

RESUMO: Para a avaliação dos parâmetros bioquímicos séricos de jumentos (Equus asinus) da raça Pêga, quanto às diferentes faixas etárias e sexo, foram analisadas amostras sanguíneas de 123 animais, sendo 29 machos com idades de 8 dias a 10 anos e 94 fêmeas (15 lactantes) de 2 dias a 12 anos, de dois criatórios na região centro-sul do estado de Minas Gerais. Os animais foram divididos em 5 grupos de acordo com as idades: Grupo 1 (≤6 meses); Grupo 2 (7-12 meses); Grupo 3 (13-48 meses); Grupo 4 (49-72 meses) e Grupo 5 (≥73 meses). De acordo com o sexo, foram divididos em dois grupos, machos e fêmeas. Para todos os animais foram realizadas as análises de proteínas totais, albumina, globulinas, relação A:G, colesterol, triglicérides, ácido úrico, creatinina, ureia, fósforo, cálcio, relação Ca:P, magnésio, alanina aminotransferase (ALT), aspartato aminotransferase (AST), fosfatase alcalina (FAL), gama glutamiltransferase (GGT) e creatina quinase (CK). Não foram encontradas diferenças significativas para os elementos globulinas, ácido úrico, ureia e relação A:G entre as faixas etárias. O Grupo 4 apresentou os maiores valores para proteínas totais quando comparados aos animais dos grupos 1 e 2. Os animais do Grupo 2 mostraram valores de albumina inferiores aos Grupos 3 e 4. Os animais do Grupo 1 apresentaram valores de colesterol superiores aos do Grupo 2 e 4, e semelhante aos demais grupos. Maior concentração sérica de fósforo foi observada nos animais do grupo 1. O cálcio apresentou valor significativamente menor no Grupo 2. A relação Ca:P foi maior para o grupo 5. Os valores do magnésio foram estatisticamente superiores nos animais com idade superior a 49 meses (Grupos 4 e 5). O valor da AST foi menor para o Grupo 1.As enzimas FAL apresentaram valor significativamente maior nos animais mais jovens até 12 meses, seguida de redução gradual com o avançar da idade. Os valores da GGT foi maior nos jumentos com até seis meses de idade, seguido de valores decrescentes para os grupos subsequentes. Não foram encontradas diferenças entre os sexos para albumina, colesterol, creatinina, ureia, ácido úrico, relação Ca:P, magnésio, ALT, AST e fosfatase alcalina. As fêmeas tiveram valores maiores para proteínas totais, globulinas e triglicérides. Os machos mostraram maiores valores para relação A:G, fósforo, cálcio e CK. Pelos resultados nota-se que a idade e o sexo podem influenciar nos valores bioquímicos séricos dos jumentos da raça Pêga.

ABSTRACT: For the evaluation of serum biochemical parameters of Pêga breed donkeys (Equus asinus), for the different age groups and sex, blood samples of 123 animals were analyzed, of 29 males aged from 8 days to 10 years and of 94 females (15 lactating) aged from 2 days to 12 years, from two farms in the central-southern Minas Gerais, Brazil. The donkeys were divided by age into 5 groups: Group 1 (≤6 months), Group 2 (7-12 months), Group 3 (13-48 months), Group 4 (49-72 months), and Group 5 (≥73 months). According to the sex, they were divided into two groups, males and females. Serum biochemical elements: total protein, albumin, globulin, the A:G ratio, cholesterol, triglycerides, uric acid, creatinine, urea, phosphorus, calcium, Ca:P ratio, magnesium, alanine aminotransferase (ALT), aspartate aminotransferase (AST), alkaline phosphatase (ALP), gamma glutamyl transferase (GGT) and creatine kinase (CK), were evaluated in all animals. No significant differences were found for globulins, uric acid, urea and A:G ratio between age groups. Group 4 showed the highest values for total protein when compared with animals in Group 1 and 2. In Goup 2, the donkeys showed albumin levels lower than Group 3 and 4. Group 1 they had cholesterol levels higher than those in Group 2 and 4, and similar of the other groups. Higher phosphorus serum concentration was observed in Group 1. Calcium was significantly lower in Group 2. The Ca:P ratio was higher for Group 5. The magnesium values were significantly higher in donkeys older than 49 months (Group 4 and 5). The value of AST was lower for group 1. The ALP enzyme was significantly higher in younger animals up to 12 months, followed by gradual decrease with advancing age. The values of GGT were higher in donkeys up to 6 months, followed by decreasing values for subsequent groups. No differences were found between genders for albumin, cholesterol, creatinine, urea, uric acid, Ca:P ratio, magnesium, ALT, AST, and alkaline phosphatase. Females had higher values for total protein, globulin and triglycerides. Males showed higher values for A:G ratio, phosphorus, calcium and CK. The results showed that age and sex can influence serum biochemical values of Pêga breed donkeys.

https://doi.org/10.1590/1678-5150-pvb-5121 694 downloads

14.

Do infants with cow's milk protein allergy have inadequate levels of vitamin D?
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Silva, Cristiane M.

; Silva, Silvia A. da

; Antunes, Margarida M. de C.

; Silva, Gisélia Alves Pontes da

; Sarinho, Emanuel Sávio Cavalcanti

; Brandt, Katia G.

Jornal de Pediatria

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dec 2017, Volume 93 N. 6 Pages 632 - 638

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Resumo Objetivo: Verificar se lactentes com alergia à proteína do leite de vaca (APLV) apresentam níveis inadequados de vitamina D. Métodos: Estudo transversal, envolveu 120 crianças de até dois anos, um grupo com APLV e outro de comparação, captadas dos ambulatórios de Gastroenterologia Pediátrica, Alergologia Pediátrica e Puericultura de um hospital universitário, no Nordeste brasileiro. Foi aplicado um formulário e foram coletadas amostras sanguíneas para a análise da vitamina D, foram considerados inadequados os níveis < 30 ng/mL. Níveis de vitamina D foram expressos em média e desvio padrão e a frequência dos graus de suficiência e demais variáveis, em proporções. Resultados: Lactentes com APLV, quando comparados com os saudáveis, apresentaram uma menor média do nível da vitamina D (30,93 vs. 35,29 ng/mL) (p = 0,041) e maior frequência de deficiência (20,3% vs. 8,2) (p = 0,049). Maior frequência de níveis inadequados de vitamina D foi observada nas crianças com APLV que estavam em aleitamento materno exclusivo/predominante (p = 0,002). Independentemente do período de exposição solar, a frequência de um status inadequado de vitamina D foi semelhante entre os grupos (p = 0,972). Conclusões: Menores níveis de vitamina D foram observados em lactentes com APLV, especialmente naqueles em aleitamento materno exclusivo/predominante, que configura esse como um possível grupo de risco para essa deficiência.

Abstract Objective: To verify whether infants with cow's milk protein allergy have inadequate vitamin D levels. Methods: This cross-sectional study included 120 children aged 2 years or younger, one group with cow's milk protein allergy and a control group. The children were recruited at the pediatric gastroenterology, allergology, and pediatric outpatient clinics of a university hospital in the Northeast of Brazil. A questionnaire was administered to the caregiver and blood samples were collected for vitamin D quantification. Vitamin D levels <30 ng/mL were considered inadequate. Vitamin D level was expressed as mean and standard deviation, and the frequency of the degrees of sufficiency and other variables, as proportions. Results: Infants with cow's milk protein allergy had lower mean vitamin D levels (30.93 vs.35.29 ng/mL; p = 0.041) and higher deficiency frequency (20.3% vs.8.2; p = 0.049) than the healthy controls. Exclusively or predominantly breastfed infants with cow's milk protein allergy had higher frequency of inadequate vitamin D levels (p = 0.002). Regardless of sun exposure time, the groups had similar frequencies of inadequate vitamin D levels (p = 0.972). Conclusions: Lower vitamin D levels were found in infants with CMPA, especially those who were exclusively or predominantly breastfed, making these infants a possible risk group for vitamin D deficiency.

https://doi.org/10.1016/j.jped.2017.01.006 9840 downloads

15.

Dispersão e consolidação de zircônia dopada com WOx a partir do tungstato de zircônio e trietanolamina em meio aquoso
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Antunes, M.

; Zorzi, J. E.

; Machado, G.

; Perottoni, C. A.

Cerâmica

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mar 2017, Volume 63 N. 365 Pages 11 - 21

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Resumo Em estudos recentes, verificou-se ser possível produzir, em meio aquoso, nanopartículas de zircônia hidratada (cristalitos inferiores a 2 nm) a partir de um precursor não usual, o tungstato de zircônio (ZrW2O8), óxido bimetálico de tamanho micrométrico (1,7 µm) e insolúvel em água. Essas nanopartículas de zircônia são capazes de formar aglomerados policristalinos transparentes à luz visível. No entanto, a produção controlada de sólidos de zircônia transparentes a partir da consolidação por centrifugação de suspensões estáveis dessas nanopartículas, desaglomeradas no momento da síntese, ainda não havia sido explorada. Dentro deste contexto, este trabalho teve por objetivo avaliar a dispersão e a consolidação de nanopartículas de zircônia hidratada produzidas a partir do ZrW2O8 em meio aquoso e utilizando-se a trietanolamina (TEOA) como surfactante, e compreender o efeito dos parâmetros experimentais empregados na dispersão sobre o teor de tungstênio remanescente nos sólidos consolidados. A síntese e dispersão foram realizadas em meio aquoso, a 80 °C, com o uso de NaOH e TEOA; em seguida, as soluções coloidais foram dialisadas, seus valores de pH foram ajustados para 6, e foram ultracentrifugadas a 28000 rpm por 24 h. Verificou-se que a utilização da TEOA na síntese permitiu a obtenção de soluções coloidais estáveis de nanopartículas de zircônia que, após centrifugação, originaram sólidos transparentes e amarelados que foram caracterizados por meio de diversas técnicas (microscopia eletrônica de varredura, espectroscopia de energia dispersiva, difração de raios X, espectroscopia Raman e de infravermelho com transformada de Fourier, além de análise térmica simultânea). Apesar de a TEOA auxiliar na dispersão das nanopartículas, ao mesmo tempo interferiu no mecanismo de síntese, levando à obtenção de zircônia dopada com WOx com quantidades de tungstênio que variaram dependendo das condições experimentais empregadas.

Abstract In recent studies, it was possible to produce hydrous zirconia nanoparticles with crystallite sizes as small as 2 nm from ZrW2O8 powder with initial particle size of 1.7 µm in an aqueous medium. The zirconia nanoparticles formed transparent polycrystalline aggregates. However, the controlled production of transparent zirconia solids by centrifugation of stable suspensions, deagglomerated in the moment of the synthesis, has not been explored yet. In this context, this study aimed to evaluate the dispersion and consolidation of hydrous zirconia nanoparticles produced from ZrW2O8, in aqueous medium and using triethanolamine (TEOA) as surfactant, and to understand the effect of experimental conditions on the tungsten content in the consolidated solids. The synthesis and dispersion were carried out in aqueous medium at 80 °C with the use of NaOH and TEOA; the colloidal solutions were dialyzed, their pH values were adjusted to 6, and then ultracentrifuged at 28000 rpm for 24 h. It has been found that the use of TEOA in the synthesis allowed obtaining stable sols of zirconia nanoparticles which, after centrifugation, originated transparent and yellowish solids that were characterized using various techniques (scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction, Raman spectroscopy, Fourier transform infrared spectroscopy, and simultaneous thermal analysis). Although TEOA assists in the dispersion of nanoparticles, it interfered in the synthesis mechanism, leading to the production of zirconia doped with WOx, with tungsten concentrations that varied depending on the experimental conditions employed.

https://doi.org/10.1590/0366-69132017633652051 972 downloads

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