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Conservative management of newborns with 35 weeks or more of gestational age at risk for early-onset sepsis: a Brazilian cohort study
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Camargo, Juliana F.

; Almeida, Juliana L.

; Fernandes, Lívia F.

; Marba, Sergio Tadeu M.

; Caldas, Jamil Pedro S.

Jornal de Pediatria

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apr 2023, Volume 99 N. 2 Pages 181 - 186

Abstract: En | Text: En | PDF: En

Abstract Objective: To evaluate the conservative management of newborns born at ≥35 weeks of gestational age, at risk for early-onset neonatal sepsis (EOS). Methods: Retrospective, analytic cohort study (2016 to 2019), including newborns ≥35 weeks of gestational at risk of EOS, asymptomatic at birth, managed conservatively in full rooming-in: serial physical examination and clinical observation for at least 48 h. They were classified into three groups, according to the clinical course: asymptomatic (group A), symptomatic for other reasons (group B), and with sepsis (group C). Risk factors, clinical signs and differential diagnoses of sepsis, length of stay, and discharge conditions were evaluated. Results: The authors evaluated 769 asymptomatic newborns at risk of EOS. (mean birth weight 2999 ± 485 g and gestational age 37.6 ± 1.7 weeks, respectively) corresponding to 12.2% of rooming-in admissions. The most prevalent risk factors were colonization by Group B Streptococcus (29%), prolonged rupture membrane duration (21.9%) and preterm labor (21.4%). Most of all of them (53.9%) remained asymptomatic (group A). Group B corresponded for 45.3%, and the most common clinical signs were hypothermia (24.5%), tremors (8.7%) and vomiting (8%). Environmental dysthermia (50.7%), prematurity (20.0%), and feeding intolerance (15.7%) were common in Group B. Laboratory tests were performed in 3.5%. Five patients (one confirmed) comprised group C (0.8/1,000 live births). There were no deaths. The median length of stay was 64 h (IQR 50-93). Conclusion: The rate of clinical/confirmed EOS was low. Most of the symptomatic patients only needed clinical evaluation to rule out sepsis. Management was shown to be safe.

https://doi.org/10.1016/j.jped.2022.08.002

A Mathematical Model for Accessing Dengue Hemorrhagic Fever in Infants
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CAMARGO, F. A.

; OLIVEIRA, T. M.

; RODRIGUES, D. S.

; MANCERA, P. F. A.

; SANTOS, F. L. P.

Trends in Computational and Applied Mathematics

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jan 2022, Volume 23 N. 1 Pages 101 - 115

Abstract: En | Text: En | PDF: En

ABSTRACT A mathematical model was developed to describe the dynamics of the primary infection of dengue virus in infants who were born to a mother immune to some serotype of the dengue virus. The model is given by a system of nonlinear ordinary differential equations with time-dependent variables for the number of dengue virus antibodies of the infant transferred from their immune, uninfected, and infected monocytes and dengue virus. The mathematical analysis was carried out where the conditions for the existence of the disease-free equilibrium and the endemic equilibrium were established. The numerical simulations were performed considering different scenarios for a basic reproductive number, R 0, illustrating the global convergence of the numerical results for the equilibrium points. The results are in agreement with our derived global stability analysis. It can be concluded that dengue hemorrhagic fever in infants could occur in the peaks observed for the infected monocytes and dengue virus.

https://doi.org/10.5540/tcam.2022.023.01.00101

Relationship between vitamin D and physical activity: systematic review and meta-analysis
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Mori, B.

; Barcellos, J. F. M.

; Lima, L. E. R.

; Zaranza, V.

; Autran, R. G.

; Camargo, E. B.

; Souza, C. S. M.

Brazilian Journal of Biology

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2022, Volume 82 elocation e263882

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

Resumo A vitamina D desempenha um papel importante na função imunológica e na inflamação e a atividade física demonstra relação próxima à síntese de vitamina D, sendo necessária a fatores imunológicos, ambientais e físicos. Pesquisamos cinco bancos de dados até 20 de fevereiro de 2021. Dois revisores examinaram os estudos, coletaram dados, avaliaram o risco de viés e classificaram as evidências para cada resultado nos estudos, de forma independente e em duplicata. Os endpoints de interesse pré-especificados foram aptidão cardiorrespiratória; Exposição à luz solar; Índice de Massa Corporal (IMC). Incluímos apenas dados de artigos revisados por pares em nossas análises primárias. Em nossa análise primária, houve uma tendência positiva entre 25(OH)D sérico <20 ng/ml e índice de massa corporal., esse resultado deve ser interpretado com cautela, considerando os intervalos de confiança (RR 1,10 IC 95% 0,37 a 1,83. Identificamos 4 evidências de alta qualidade de que níveis de vitamina D e atividade física alta exigiam uma relação direta considerando (quatro ensaios com 2.253) ; RR 0 . (RR 0,0; IC 95% -0,15 a 0,15) (RR 0,59; IC 95% 0,43 a 0,75. Embora as evidências disponíveis até agora, de estudos observacionais de qualidade média, possam ser vistas como uma tendência de associação entre níveis séricos suficientes de 25(OH)D e atividade física, essa relação foi demonstrada. têm um efeito estimulante na síntese de vitamina D, a relação de baixo índice de massa corporal com níveis suficientes de vitamina D não é baseada em evidências sólidas. Aguardamos resultados de estudos em andamento para determinar essa eficácia.

Abstract Vitamin D plays an important role in immune function and inflammation and the physical activity demonstrate relationship near to syntheses of vitamin D, considering to necessary to factors immunologics, environmental and physical. We searched five databases through February 20, 2021. Two reviewers screened the studies, collected data, assessed the risk of bias, and ranked the evidence for each outcome across the studies, independently and in duplicate. The prespecified endpoints of interest were Cardiorespiratory Fitness; Sunlight Exposure; Body Mass Index (BMI). We only included data from peer-reviewed articles in our primary analyses. In our primary analysis, there was a positive trend between serum 25(OH)D <20 ng/ml and body mass index, this result should be interpreted with caution, considering confidence intervals (RR 1.10 95% CI 0.37 to 1.83. We identified 4 high quality evidence that vitamin D levels and high physical activity required a direct relationship considering (four trials with 2,253) ; RR 0. (RR 0.0; 95% CI -0.15 to 0.15) (RR 0.59; 95% CI 0.43 to 0.75. Although the evidence available so far, from observational studies of medium quality, can be seen as showing a trend towards an association between sufficient serum levels of 25(OH)D and physical activity, this relationship has been shown. have a stimulating effect on vitamin D synthesis, the relationship of low body mass index with sufficient vitamin D levels is not based on solid evidence. We await results from ongoing studies to determine this effectiveness.

https://doi.org/10.1590/1519-6984.263882

Red cabbage (Brassica oleracea L.) extract reverses lipid oxidative stress in rats
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VEBER, BRUNO

; CAMARGO, ANDERSON

; DALMAGRO, ANA PAULA

; BONDE, HENRIQUE LUIS P.

; MAGRO, DÉBORA D. DAL

; LIMA, DANIELA D. DE

; ZENI, ANA LÚCIA B.

Anais da Academia Brasileira de Ciências

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2020, Volume 92 N. 1 elocation e20180596

Abstract: En | Text: En | PDF: En

Abstract Red cabbage (Brassica oleracea L. var. capitata f. rubra DC.) extract has been demonstrated hypolipidemic and antioxidant capacity. Herein, we investigated the effect of red cabbage aqueous extract (RC) or fenofibrate (FF) in oxidative stress induced by Triton WR-1339 in rats. The antioxidant capacity was evaluated through the superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GSH-Px) activities and, thiobarbituric reactive species (TBARS) and protein carbonyl (PC) levels in erythrocytes, liver, kidneys, cerebral cortex and hippocampus of male rats. The alterations promoted by Triton WR-1339 in enzymatic antioxidant defense in the liver, kidneys and hippocampus were reversed by RC or FF treatments. The TBARS and PC levels increased in the liver, cerebral cortex and hippocampus of hyperlipidemic rats were decreased by the treatments with RC or FF. These findings demonstrated that RC is a potential therapy to treat diseases not only involving dyslipidemic condition but also oxidative stress.

https://doi.org/10.1590/0001-3765202020180596 1276 downloads

Thermal comfort monitoring in aviaries by a real-time data acquisition system
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Camargo, Tiago F. B.

; Silva, Robson L.

; Higa, Márcio

; Coutinho, Mônica R.

; Oliveira, Júlio C. D. de

; Conceição, Wagner A. dos S.

Revista Brasileira de Engenharia Agrícola e Ambiental

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sep 2019, Volume 23 N. 9 Pages 694 - 701

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

RESUMO O conforto térmico no interior de instalações de criação de frangos de corte é essencial na obtenção de bons resultados nesta atividade de produção. A avaliação das condições termodinâmicas adequadas requer a medição e controle, geralmente implicando em custos e manutenção especializada. Neste trabalho, objetivou-se monitorar a distribuição de temperatura, umidade relativa e velocidade do ar utilizando sistema desenvolvido, de baixo custo, de código aberto e de fácil uso, com Arduíno (hardware) e Scilab (software) para aquisição de dados em tempo real. Os sensores foram instalados em uma unidade de produção existente (Cianorte, PR), com medições para o ambiente interno (20 sensores de temperatura/umidade e 2 sensores de pressão diferencial, respectivamente, a 0,5 e 1,5 m de altura) e para ambiente externo (pressão e velocidade do vento, a 1,5 m de altura). Sistema de aquisição de dados permitiu a comunicação com sensores, que são facilmente lidos por computador e armazenados em um arquivo de dados. O sistema de aquisição de dados desenvolvido provou-se eficiente quando aplicado em uma instalação de criação comercial de frangos de corte, permitindo o monitoramento em tempo real para os parâmetros de conforto térmico.

ABSTRACT Thermal comfort inside broiler husbandry facilities is essential in obtaining good results in the production activity. Assessment of adequate thermodynamic conditions requires measurement and control, usually implying costs and specialized maintenance. The objective of this research was to monitor the temperature, relative humidity and air speed distributions by a developed low-cost, open-source and easy-to-use measurement system, using Arduino (hardware) and Scilab (software) for real-time data acquisition. Sensors were installed in a real facility (Cianorte, PR), with measurements for internal ambient (20 sensors for temperature/relative humidity, and two sensors for differential pressure, respectively 0.5 and 1.5 m high) and external ambient (pressure and wind speed, 1.5 m high). Data acquisition system has enabled communication with sensors which are easily read by the computer and stored in a data file. The developed data acquisition system proved to be efficient when applied in a commercial broiler husbandry facility, enabling real-time monitoring for thermal comfort parameters.

https://doi.org/10.1590/1807-1929/agriambi.v23n9p694-701 1331 downloads

Análise do Método Multi-Passos com Transformada Diferencial Generalizada na Modelagem Fracionária
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KURODA, L. K. B.

; BRUNO-ALFONSO, A.

; MANCERA, P. F. A.

; CAMARGO, R. F.

TEMA (São Carlos)

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apr 2019, Volume 20 N. 1 Pages 133 - 147

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

RESUMO Apresenta-se uma análise crítica de uma técnica numérica que tem sido usada na resolução de equações diferenciais de ordem fracionária com derivadas de Caputo. Trata-se do método multi-passos com transformada diferencial generalizada. Verifica-se que a versão do método disponível na literatura produz soluções erradas a partir do segundo passo, isto é mostrado em aplicações aos modelos de Malthus e de Riccati. O problema é explicado em termos da não localidade da derivada de Caputo e das propriedades da transformada diferencial generalizada.

ABSTRACT This paper presents a critical analysis of a numerical technique that has been used in the resolution of fractional differential equations with Caputo derivative. It is the multi-step method with generalized differential transform. It is found that the version of the method available in the literature produces erroneous solutions from the second step, this is shown in applications to the Malthus and Riccati models. The procedure error is explained in terms of the nonlocality of the Caputo derivative and the properties of the generalized differential transform.

https://doi.org/10.5540/tema.2019.020.01.0133 476 downloads

Molecular identification and microbiological evaluation of isolates from equipments and food contact surfaces in a hospital Food and Nutrition Unit
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Pieniz, S.

; Rodrigues, D. F.

; Arndt, R. M.

; Mello, J. F.

; Rodrigues, K. L.

; Andreazza, R.

; Camargo, F. A. O.

; Brandelli, A.

Brazilian Journal of Biology

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apr 2019, Volume 79 N. 2 Pages 191 - 200

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

Resumo O controle higiênico e sanitário nas Unidades de Alimentação e Nutrição (UAN) é considerado um procedimento padrão para produzir refeições adequadas e reduzir o risco de doenças transmitidas pelos alimentos e infecções hospitalares. Este estudo teve como objetivo isolar e identificar bactérias de equipamentos e superfícies de contato com alimentos em uma UAN hospitalar, bem como avaliar a condição sanitária. Do mesmo modo, analisou-se a adesão dos micro-organismos em tábuas de corte de polietileno. A presença de micro-organismos aeróbios mesófilos, leveduras, fungos, Sthapylococcus coagulase-positivos, coliformes, coliformes fecais e Escherichia coli foi analisadas na superfície de mesas do refeitório, superfícies de bancada e tábuas de corte usadas para manuseio de carne ou vegetais e, em equipamentos como micro-ondas e refrigeradores. A identificação molecular foi feita pelo sequenciamento do gene 16S rRNA. A adesão dos micro-organismos (formação de biofilmes) em tábuas de corte de carne e de vegetais também foi avaliada por microscopia eletrônica de varredura. Os resultados mostraram elevada contagem para todos os micro-organismos analisados, exceto para E. coli, a qual não foi observada nas amostras. A análise molecular identificou espécies da família Enterobacteriaceae e Pseudomonadaceae. A análise de microscopia eletrônica de varredura revelaram adesão bacteriana nas superfícies das placsa de corte. Os resultados obtidos neste estudo indicaram que as condições higiênicas das superfícies e de equipamentos nesta UAN hospitalar estavam inadequadas. A aplicação de procedimentos operacionais padrão poderia auxiliar positivamente na padronização do controle higiênico-sanitário, reduzindo a contaminação microbiana e fornecendo um alimento seguro para pacientes hospitalizados.

Abstract The hygienic and sanitary control in Food and Nutrition Units (FNU) is considered a standard procedure to produce adequate meals and reduce the risk of foodborne diseases and hospital infections. This study aimed to evaluate the isolation and identification of bacteria from equipment and food contact surfaces in a hospital FNU as well as to evaluate the sanitary condition. Likewise, it was analyzed the adhesion of the microorganisms on polyethylene cutting boards. The presence of aerobic mesophilic microorganisms, yeasts, molds, coagulase-positive staphylococci, coliform and fecal coliform, and Escherichia coli were analyzed on eating tables, countertop surfaces and cutting boards used for meat or vegetable handling, and equipment such as microwaves and refrigerators. The molecular identification it was done by 16S rRNA gene sequencing. The adhesion of the microorganisms (biofilm formation) on meat and vegetable cutting boards was also evaluated by scanning electron microscopy. The results showed high numbers of all microorganisms, except for E. coli , which was not observed in the samples. The molecular analysis identified species of the Enterobacteriaceae family and species of the Pseudomonadaceae family. Scanning electron microscopy analyses revealed bacterial adhesion on the cutting board surfaces. The results obtained in this study indicated that the hygienic conditions of surfaces like plastic cutting boards and equipment in this hospital FNU were inadequate. The achievement and application of standard operating procedures could positively help in the standardization of sanitary control, reducing the microbial contamination and providing a safe food to hospitalized patients.

https://doi.org/10.1590/1519-6984.175350 3105 downloads

Synthesis, Antimicrobial Activity and Structure-Activity Relationship of Some 5-Arylidene-thiazolidine-2,4-dione Derivatives
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Paiva, Raíssa K. C. de

; Silva, Jamerson F. da

; Moreira, Hudieyllen A.

; Pinto, Osvaldo G.

; Camargo, Lilian T. F. M.

; Naves, Plínio L. F.

; Camargo, Ademir J.

; Ribeiro, Luciano

; Ramos, Luciana M.

Journal of the Brazilian Chemical Society

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jan 2019, Volume 30 N. 1 Pages 164 - 172

Abstract: En | Text: En | PDF: En

Derivatives of the thiazolidine-2,4-dione core represent a heterocyclic class with several correlated properties. In this context, the synthesis of structural analogues of these bioactive substances becomes attractive in the field of medicinal chemistry. These analogues act as antimicrobial agents against Gram-positives pathogens. The present work aimed to synthesize 10 different derivatives of 5-arylidene-thiazolidine-2,4-dione, employing urea as the catalyst in a solvent-free reaction medium, with yields that ranged from 45 to 99%. The compounds obtained were submitted to an antimicrobial assay against S. aureus ATCC 29213. Two compounds presented minimum inhibitory concentration of 62.5 and 32.5 µg mL-1 and minimum bactericidal concentration < 500 µg mL-1, demonstrating their antibacterial potential. Principal component analysis was carried out to discriminate the compounds in active and inactive classes. Four geometric and electronic molecular descriptors were required to completely discriminate the compounds. The selected descriptors can guide us in designing new 5-arylidene-thiazolidine-2,4-dione derivatives with enhanced activity.

https://doi.org/10.21577/0103-5053.20180167 1397 downloads

EVALUATION OF THE GROWTH AND SURVIVAL OF MANGROVE SEEDLINGS UNDER DIFFERENT LIGHT INTENSITIES: SIMULATING THE EFFECT OF MANGROVE DEFORESTATION
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Silva, Neilson Rocha da

; Maia, Rafaela Camargo

Revista Árvore

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2019, Volume 43 N. 3 elocation e430308

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

RESUMO Os fatores ambientais, principalmente a luminosidade, temperatura e as condições edáficas são de grande importância para o estabelecimento da comunidade vegetal. Em áreas degradadas por desmatamento, esses fatores podem passar por alterações de grande magnitude, podendo a fetar a recolonização das populações típicas da área alterada. Neste contexto, o objetivo deste estudo foi avaliar o desenvolvimento de plântulas de espécies pioneiras de mangue sob diferentes níveis de sombreamento, em substrato de solo degradado pelo desmatamento, visando o efeito do desmatamento na recolonização das plântulas de mangue e gerar subsídios para a recuperação de áreas desmatadas e produção de mudas. O estudo foi realizado no Instituto Federal do Ceará, localizado no Município de Acaraú no Estado do Ceará, Brasil. Para o experimento foram escolhidas as espécies Avicennia schaueriana Stapf and Leechm. ex Moldenke (1939) e Laguncularia racemosa C. F. Gaertn (1807). O substrato para produção das mudas foi coletado em área impactada por desmatamento, apresentando baixa fertilidade e de textura franco argilosa. As plântulas foram testadas a pleno sol e sob níveis de 30%, 50% e 70% de sombreamento. Os dados obtidos foram altura, diâmetro do coleto, anotações das condições fenológicas das plântulas, matéria fresca, matéria seca da raiz, parte aérea e a temperatura ambiente dos viveiros. Os resultados revelaram que em condições de desmatamento total da área de mangue, gerando alta luminosidade e solos degradados, a regeneração natural é comprometida, sendo essencial a intervenção humana, com sombreamento de 50% para uma boa estabilidade de plântulas.

ABSTRACT Environmental factors, especially light, temperature, and edaphic conditions are of great importance for the establishment of plant communities. In areas degraded by deforestation, these factors can vary greatly, which may affect the recolonization of the typical populations in the altered area. This study evaluated the development of seedlings of pioneer mangrove species under different levels of shading in soil substrate degraded by deforestation, aiming to assess the effect of deforestation on the recolonization of mangrove forests, which may be of help in the production of seedlings and recovery of deforested areas. The study was conducted in the municipality of Acaraú in the state of Ceará, Brazil. The species Avicennia schaueriana Stapf and Leechm. ex Moldenke (1939) and Laguncularia racemosa C. F. Gaertn (1807) were used in the study, and the substrate was collected from an area impacted by deforestation. The propagules and seedlings were exposed to full sun and 30, 50 and 70% shading. The results revealed that the treatment at full sun had the lowest germination rate of 86.66% for L. racemosa. Seedlings of both species showed a significant difference and better quality between shading treatments and full sun. The height of the seedlings showed a correlation above -0.90 with ambient temperature. L. racemosa tested in full sun had a viable seedling reduction of 50% and A. schaueriana was superior. It is concluded that the natural regeneration of a mangrove area can be compromised under the conditions of total deforestation with high sun exposure and degraded soils. Human intervention in providing 50% shading is essential for the development of seedlings and regeneration of the area impacted by deforestation.

https://doi.org/10.1590/1806-90882019000300008 748 downloads

10.

Estructuras Porosas de TiO2-Na0.8Ti4O8-Na2Ti6O13: Propiedades Superficiales y Evaluación Citotóxica
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Triviño-Bolaños, Diego F.

; Camargo-Amado, Rubén J.

; Muñoz-Saldaña, Juan

; Giraldo-Betancur, Astrid L.

Información tecnológica

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dec 2018, Volume 29 N. 6 Pages 95 - 102

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

Abstract Porous structures TiO2-Na0.8Ti4O8-Na2Ti6O13 were obtained by mixing, compacting and sintering TiO2 with sodium bicarbonate as porogenic agent (15 and 30 wt.% of NaHCO3). The samples were compacted and treated at 1100 °C for 4 h and 8 h. The effects of sintering time and the weight percent of NaHCO3 on surface mechanical properties, porosity and cytotoxicity were analyzed. The X-ray diffraction patterns were refined by the Rietveld method. Microstructures were observed by scanning electron microscopy and the effect of material composition on the cellular response in vitro was evaluated using a LDH-cytotoxicity assay. The porosity varied between 3.2% and 11.9%, the surface microhardness between 251.4 HV0.2 and 851.6 HV0.2. The cytotoxicity results on the CHO cell line (Chinese Hamster ovary) show that the porous structures are not cytotoxic and has potential for orthopedic tissue engineering applications.

Resumen Se obtuvieron estructuras porosas de TiO2-Na0.8Ti4O8-Na2Ti6O13 mezclando, compactando y sinterizando TiO2 con bicarbonato de sodio como agente porogénico (15% y 30% en peso de NaHCO3). Las muestras se compactaron y trataron a 1100 °C durante 4 h y 8 h. Se analizaron los efectos del tiempo de sinterización y el porcentaje en peso de NaHCO3 sobre las propiedades mecánicas superficiales, porosidad y citotoxicidad. Los patrones de difracción de rayos X se refinaron por el método Rietveld, usando GSAS. Las microestructuras se observaron mediante microscopía electrónica de barrido y el efecto de composición de los materiales sobre la respuesta celular in vitro se evaluó usando ensayo LDH de citotoxicidad. La porosidad varió entre 3.2% y 11.9%, la microdureza superficial entre 251.4 HV0.2 y 851.6 HV0.2. Los resultados de citotoxicidad en la línea celular CHO (ovario de Hámster chino) muestran que las estructuras porosas no son citotóxicas y tienen potencial para su aplicación en ingeniería de tejidos ortopédicos.

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11.

Secagem e difusividade de sementes de melão
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Silva, Isneider L.

; Silva, Hellismar W. da

; Camargo, Fernando R. T. de

; Farias, Hiago F. L. de

; Freitas, Elaine de F. M.

Revista de Ciências Agrárias

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jun 2018, Volume 41 N. 2 Pages 21 - 30

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

As sementes do melão contêm alto teor de água após a extração, necessitando da secagem para manter as suas qualidades fisiológicas. O objetivo deste trabalho consistiu em modelar curvas de secagem das sementes de melão em diferentes temperaturas, determinar o coeficiente de difusão efetivo e a energia de ativação. A secagem foi realizada em condições controladas, nas temperaturas de 35, 40, 45, e 50 °C, utilizando-se três repetições de 10 g de sementes, as quais foram pesadas periodicamente até atingirem massa constante. Os dados experimentais foram ajustados a diferentes modelos matemáticos frequentemente utilizados na representação da secagem de sementes. O coeficiente de difusão efetivo, calculado a partir do modelo matemático da difusão líquida para esferoide prolato, foi utilizado para obtenção da energia de ativação. Os resultados evidenciaram que o modelo de Page é o que melhor se ajusta aos dados experimentais. A elevação da temperatura de secagem reduz o tempo de secagem e promove aumento do coeficiente de difusão efetivo. A relação do coeficiente de difusão com a temperatura de secagem pode ser descrita pela equação de Arrhenius, apresentando uma energia de ativação de 55,81 kJ mol-1 no processo de secagem das sementes de melão.

The melon seeds contain high water content after extraction, requiring drying to maintain their physiological qualities. The objective of this work was to model drying curves of melon seeds at different temperatures, to determine the effective diffusion coefficient and the activation energy. Drying was carried out under controlled conditions at temperatures of 35, 40, 45, and 50 °C using three replicates of 10 g of seeds, which were weighed periodically until reaching constant mass. The experimental data were adjusted to different mathematical models frequently used in the representation of seed drying. The effective diffusion coefficient, calculated from the mathematical model of net diffusion to spheroid prolat, was used to obtain the activation energy. The results showed that the Page model is the one that best fits the experimental data. The increase of the drying temperature reduces the drying time and promotes an increase of the effective diffusion coefficient. The relation of the diffusion coefficient to the drying temperature can be described by the Arrhenius equation, presenting an activation energy of 55.81 kJ mol-1 in the drying process of the melon seeds.

https://doi.org/10.19084/RCA17278 992 downloads

12.

Commercial and Noncommercial Peroxidases Activity under Ultrasound and Microwave Treatment: a Pretreatment to Improve Wastewater Treatment
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Golunski, Simone M.

; Scapini, Thamarys

; Modkovski, Tatiani Andressa

; Marques, Camila T.

; Camargo, Aline F.

; Preczeski, Karina Paula

; Rosa, Camila Dalla

; Baldissarelli, Daiane P.

; Mulinari, Jéssica

; Venturin, Bruno

; Vargas, Gean D. L. P.

; Buffon, Jaqueline G.

; Mossi, Altemir José

; Treichel, Helen

Journal of the Brazilian Chemical Society

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oct 2017, Volume 28 N. 10 Pages 1890 - 1895

Abstract: En | Text: En | PDF: En

This study aimed at evaluating the activity of peroxidases after ultrasound and microwave radiation exposure as an alternative to the wastewater treatment improvement. The results showed that after treatment with ultrasound using a power of 30% and a temperature of 55 °C was obtained an increase in relative activity, 129.5% in the enzyme from rice bran, 147.9% in the enzyme from soybean meal and 102.4% in the enzyme from horseradish. Using microwave radiation, the highest relative activity (107.4%) was observed for the peroxidase extracted from rice bran with 10 seconds of reaction time and a reaction temperature of about 50 °C. The data obtained in this study suggest that the ultrasonic bath and microwave are adequate for conducting reactions catalyzed by peroxidases because it was possible to increase their activity during the performed tests. Preliminary tests of enzyme application showed that the highest color removal occurred using 3 mL of the enzyme extract from rice bran and H2O2 concentrations of 40 mg L-1. This condition resulted in a color removal of about 40%.

https://doi.org/10.21577/0103-5053.20170023 705 downloads

13.

3rd Guideline for Perioperative Cardiovascular Evaluation of the Brazilian Society of Cardiology
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Gualandro, Danielle Menosi

; Yu, Pai Ching

; Caramelli, Bruno

; Marques, André Coelho

; Calderaro, Daniela

; Fornari, Luciana Savoy

; Pinho, Claudio

; Feitosa, Alina Coutinho Rodrigues

; Polanczyk, Carisi Anne

; Rochitte, Carlos Eduardo

; Jardim, Carlos

; Vieira, Carolina L. Z.

; Nakamura, Debora Y. M.

; Iezzi, Denise

; Schreen, Dirk

; Adam, Eduardo Leal

; D’Amico, Elbio Antonio

; Lima, Emerson Q. de

; Burdmann, Emmanuel de Almeida

; Mateo, Enrique Indalecio Pachón

; Marcondes-Braga, Fabiana Goulart

; Machado, Fabio S.

; Paula, Flavio J. de

; Carmo, Gabriel Assis Lopes do

; Feitosa-Filho, Gilson Soares

; Prado, Gustavo Faibischew

; Lopes, Heno Ferreira

; Fernandes, João R. C.

; Lima, José J. G. de

; Sacilotto, Luciana

; Drager, Luciano Ferreira

; Vacanti, Luciano Janussi

; Rohde, Luis Eduardo Paim

; Prada, Luis F. L.

; Gowdak, Luis Henrique Wolff

; Vieira, Marcelo Luiz Campos

; Monachini, Maristela Camargo

; Macatrão-Costa, Milena Frota

; Paixão, Milena Ribeiro

; Oliveira Junior, Mucio Tavares de

; Cury, Patricia

; Villaça, Paula R.

; Farsky, Pedro Silvio

; Siciliano, Rinaldo F.

; Heinisch, Roberto Henrique

; Souza, Rogerio

; Gualandro, Sandra F.M.

; Accorsi, Tarso Augusto Duenhas

; Mathias Júnior, Wilson

Arquivos Brasileiros de Cardiologia

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sep 2017, Volume 109 N. 3 Pages 1 - 104

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

https://doi.org/10.5935/abc.20170140 100302 downloads

14.

Assessment of the impact of changes in temperature in Biomphalaria glabrata (Say, 1818) melanic and albino variants infected with Schistosoma mansoni (Sambon, 1907)
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Camargo, E. A. F.

; Camargo, J. T. F.

; Neves, M. F.

; Simões, L. F.

; Bastos, L. A. D.

; Magalhães, L. A.

; Zanotti-Magalhães, E. M.

Brazilian Journal of Biology

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jul 2017, Volume 77 N. 3 Pages 490 - 494

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

Resumo Flutuações na densidade populacional de planorbídeos hospedeiros do S. mansoni são influenciadas por fatores climáticos. O conhecimento sobre a interferência de alterações na temperatura da água nestas populações é um aspecto importante da epidemiologia da esquistossomose. Neste experimento avaliou-se a influência de diferentes temperaturas no desenvolvimento de Schistosoma mansoni em Biomphalaria glabrata variantes melânica e albina. Os resultados indicaram uma relação intrínseca entre temperatura e desenvolvimento do parasito na fase intramolusco, independente da pigmentação do manto dos moluscos. Quanto mais elevada a temperatura, menor o período necessário para desenvolvimento do parasito e maior mortalidade dos moluscos infectados. Conclui-se que, na presença de alterações climáticas, o aumento da temperatura em regiões frias e alagadas poderá favorecer o estabelecimento de novos focos de transmissão da esquistossomose alterando a extensão geográfica e ampliando o potencial epidemiológico da transmissão. Em regiões de clima quente, o aumento da temperatura, por sua vez, poderá comprometer a transmissão da doença em virtude do estresse biológico sofrido por parasito e hospedeiro. Nestas condições, poderá ocorrer a morte do parasito ou uma alteração na sua habilidade de infectar novas espécies de moluscos hospedeiros em novas áreas. Padrões de pigmentação do manto nos moluscos não demonstraram interferência significativa no desenvolvimento do parasita.

Abstract Fluctuations in population density of planorbid hosts of S. mansoni are influenced by climatic factors. The knowledge about interference from changes in water temperature in these populations is an important aspect of the epidemiology of schistosomiasis. In this experiment, it is explored the influence of different temperatures on the development of Schistosoma mansoni in Biomphalaria glabrata melanic and albino variants. The results indicated an intrinsic relationship between temperature and development of the parasite in the intramollusc phase, independent of the pigmentation of the mantle of the molluscs. The higher the temperature, the shorter the period necessary for the development of the parasite was while the higher the mortality of infected mollusks. It is concluded that, in the presence of climate change, the increasement of temperature in cold and flooded regions may encourage the establishment of new foci of transmission of schistosomiasis by changing the geographic extent and extending the epidemiological transmission potential. In warm climates, higher temperatures, however, could compromise the transmission of the disease because of biological stress suffered by parasite and host. Under these conditions, it can result in the death of the parasite or a change in their ability to infect new host species of molluscs in new areas. Mantle pigmentation patterns in molluscs have not shown significant interference in the development of the parasite.

https://doi.org/10.1590/1519-6984.16715 1160 downloads

15.

Host-parasite relationship between Biomphalaria amazonica (Paraense, 1966) and Schistosoma mansoni (Sambon, 1907)
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Simões, L. F.

; Bastos, L. D. B.

; Camargo, E. A. F.

; Neves, M. F.

; Linhares, A. X.

; Magalhães, L. A.

; Zanotti-Magalhães, E. M.

Brazilian Journal of Biology

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jun 2017, Volume 77 N. 2 Pages 340 - 346

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

Resumo Biomphalaria amazonica é uma espécie de planorbídeo considerada vetora potencial do Schistosoma mansoni. É amplamente distribuída na zona neotropical, especialmente no Norte e Centro-Oeste do Brasil e Norte da Bolívia. O presente trabalho teve por objetivo estudar a relação parasito-hospedeiro entre B. amazonica e S. mansoni (linhagens BH e SJ). Espécimes de B. amazonica e sua água de condicionamento foram examinados em relação à sua capacidade de atração miraxonal. A infectividade dos moluscos foi testada expondo-os a 20 miracídios de ambas as linhagens. A viabilidade dos esporocistos e o desenvolvimento de reações amebocitárias foram estudados após cada molusco ser exposto a 100 miracídios. Apesar de não eliminarem cercárias, B. amazonica provou ser capaz de atrair 77% dos miracídios a que foram expostos. Esporocistos viáveis sem reação amebócitaria foram encontrados 96 horas após a exposição aos miracídios. Esses resultados indicam a suscetibilidade de B. amazonica às linhagens BH e SJ de S. mansoni e, portanto, demonstram a importância desta espécie de planorbídeo como um vetor potencial do trematodeo na área onde ele ocorre.

Abstract Biomphalaria amazonica is a planorbid species considered a potential host of Schistosoma mansoni. It is widely distributed in the Neotropical zone, particularly in the North and Centre-West of Brazil and in the North of Bolivia. The aim of the present study was to determine the host-parasite relationship between B. amazonica and S. mansoni (BH and SJ strains). Specimens of B. amazonica and their snail-conditioned water were examined in terms of their ability to attract miracidia. The infectivity of the mollusks was determined by exposing them to 20 miracidia of both strains. Sporocyst development and amebocyte reactions were studied after each mollusk specimen was exposed to 100 miracidia. Although no cercariae were eliminated, specimens of B. amazonica proved capable of attracting 77% of the miracidia they were exposed to. Viable sporocysts with no amebocyte reaction were found 96 hours after the exposure to miracidia. These results indicate the susceptibility of B. amazonica to the BH and SJ strains of S. mansoni, and therefore demonstrate the importance of this planorbid species as a potential vector of the trematode in the areas where it occurs.

https://doi.org/10.1590/1519-6984.14415 952 downloads

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