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Resumo A possível interferência de populações de pragas resistentes na ação de inimigos naturais ainda não foi esclarecida. Assim, este trabalho teve como objetivo avaliar o desempenho de Trichogramma pretiosum Riley (Hymenoptera: Trichogrammatidae) em ovos de Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae) com frequência de resistência à Metaflumizona ao longo de seis gerações de exposição ao produto. Cartelas (2,0 x 7,0 cm) com ovos de duas populações de S. frugiperda, (resistente à Metaflumizona e outra suscetível), foram expostas às fêmeas de T. pretiosum por 24 horas em condições de livre escolha e sem chance de escolha por três gerações (G1, G4 e G6). O delineamento experimental foi inteiramente casualizado com 25 repetições, sendo cada repetição composta por uma cartela (unidade experimental) contendo 20 ovos. Os parâmetros avaliados foram: parasitismo (%), emergência (%), razão sexual, número de parasitoides emergidos por ovo e longevidade de machos e fêmeas. ANOVA e teste de Tukey (P≤ 0,05) foram aplicados aos dados coletados. Os resultados mostraram redução do parasitismo [41,0% (G1) e 28,4% (G4)], emergência de ovos (17,5%) e parasitoides/ovo [16,2 (G4) e 17,2 (G6)] em ovos oriundos da população com frequência de resistência. As fêmeas emergidas de ovos da população G6 sem exposição à Metaflumizona, tiveram maior longevidade (3,5 dias a mais) do que a população exposta ao inseticida. A razão sexual e a longevidade de machos não foram afetadas. Os resultados indicam uma redução na atividade de T. pretiosum se as populações de S. frugiperda apresentarem alguma frequência de resistência à Metaflumizona.

Abstract The possible interference of resistant pest’s populations to insecticides in natural enemies in the action thas not been clarified yet. Thus, this study aimed to evaluate Trichogramma pretiosum Riley (Hymenoptera: Trichogrammatidae) performance on Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae) eggs with resistance frequency to the Metaflumizone over six generations of product exposure. Egg cards (2.0 x 7.0 cm) containing eggs from two populations of S. frugiperda, (resistant to Metaflumizone and the other susceptible), were exposed to T. pretiosum females for 24 hours in free-choice and no-choice testing in three generations (G1, G4, and G6). A completely randomized experimental design was used with 25 replications, each consisting of an egg card (experimental unit) containing 20 eggs. The parameters evaluated were: parasitism (%), emergence (%), sex ratio, number of emerged parasitoids per egg and males/females longevity. ANOVA and Tukey test (P≤ 0.05) were applied on the results. Results showed a reduction in parasitism [41.0% (G1) and 28.4% (G4)], egg emergence (17.5%) and parasitoids/egg [16.2 (G4) and 17.2 (G6)] in eggs originating from the population with resistance frequency. Females emerging from G6 populations eggs without exposure to Metaflumizone had greater longevity (3.5 days more) than the resistant population. The sex ratio and male longevity were not affected. The results indicate a reduction in T. pretiosum activity if S. frugiperda populations have some frequency of resistance to Metaflumizone.

https://doi.org/10.1590/1519-6984.245273 77 downloads

Evaluation of the acute and sublethal toxicity of Mancozeb in Pacamã (Lophiosilurus alexandri)
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Silva, A. L.

; Albinati, A. C. L.

; Souza, S. A.

; Marques, J. V. S.

; Andrade, I. B. M.

; Souza, Y. R. C.

; Amorim, A. G.

Brazilian Journal of Biology

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2023, Volume 83 elocation e274393

Resumo: En Pt | Texto: En Pt | PDF: En | PDF: Pt

Abstract The toxic potential of dithiocarbamates fungicides widely used in world agriculture is well known, among which Mancozeb is one of the most used. This study aimed to evaluate the toxicity of Mancozeb, determining the LC50% of the product and the behavioral and histological changes observed in fish of the Pacamã species through acute and sublethal toxicity tests. The first experiment was carried out on Pacamã fingerlings exposed to dosages of 0.5, 1, 2, 4, and 8mg/L of Mancozeb under the form ManzateWG®, for a total period of 96 hours in the acute experiment, and in the second experiment, fish were subjected to concentrations of 1/10 of those used in the acute experiment (0.05, 0.1, 0.2, 0.4 and 0.8mg/L, respectively), for 15 days in total. The 50% lethal concentration of ManzateWG® was calculated at the end of the acute experiment, presenting a value of 2.29mg/L at 96h for Pacamã fingerlings. A behavioral assessment was carried out through daily observation of the fish during both experiments, and an increase in mucus production was observed, as well as atypical social behavior in those exposed to the toxic agent. Histopathological evaluation was performed on livers collected after the end of the sublethal experiment, and the main hepatic alterations observed were cytoplasmic vacuolization, inflammatory infiltrate, and necrosis. Mancozeb has toxic potential and is capable of generating behavioral changes, as well as increasing the risk of liver damage in Pacamãs exposed to this compound.

Resumo O potencial tóxico dos fungicidas ditiocarbamatos amplamente usados na agricultura mundial é bem conhecido, e entre estes, o Mancozebe é um dos mais utilizados. Esse estudo teve como objetivo avaliar a toxicidade do Mancozebe, determinando a CL50% do produto e as alterações comportamentais e histológicas, observadas em peixes da espécie pacamã através de testes de toxicidade aguda e subletal. O primeiro experimento foi realizado em alevinos de pacamã expostos a dosagens de 0,5, 1, 2, 4 e 8mg/L de Mancozebe sob a forma ManzateWG®, por um período total de 96 horas no experimento agudo, e no segundo experimento os peixes foram submetidos a concentrações de 1/10 daquelas utilizadas no experimento agudo (0,05, 0,1, 0,2, 0,4 e 0,8mg/L, respectivamente), a exposição no segundo experimento foi de 15 dias. A concentração letal a 50% do ManzateWG® foi calculada ao fim do experimento agudo, apresentando um valor de 2,29mg/L às 96h para alevinos de pacamã. Avaliou-se o comportamento por meio da observação diária dos peixes, notando-se o aumento da produção de muco assim como comportamento social atípico naqueles indivíduos expostos ao agente tóxico. A análise histopatológica foi conduzida nos fígados coletados após a conclusão do experimento subletal, identificando as principais alterações hepáticas como vacuolização citoplasmática, infiltrado inflamatório e necrose. O Mancozebe apresenta potencial tóxico e é capaz de gerar alterações comportamentais, assim como aumentar o risco de lesões hepáticas em pacamãs expostos a este composto.

https://doi.org/10.1590/1519-6984.274393

Fuzzy Modelling to Describe the Pollutant Concentration in Fluids
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ALCINO, M. S.

; SALGADO, S. A. B.

; PIRES, D. M.

; SOUZA, S. M. DE

; ARMINDO, R. A.

; SILVA, N. C. DA

Trends in Computational and Applied Mathematics

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Dez 2022, Volume 23 Nº 4 Páginas 731 - 747

Resumo: En | Texto: En | PDF: En

ABSTRACT The study of the concentration dynamics of a pollutant substance in a fluid is a classic problem of fluid mechanics given by the transport equation u t + cu x = 0, where u = u(x,t) denotes the pollutant concentration along a horizontal pipe of a fixed cross-section in the positive x direction at he time t > 0 and c represents the fluid propagation velocity. In view of that, the velocity of propagation of the fluid is a physical quantity, obtained, generally in an approximate form, which makes such quantity uncertain. In this paper, we propose to obtain the concentration when the constant c represents the fuzzy set. The concentration was obtained by using the Zadeh’s Extension Principle. Through the concentration obtained, we analyze the influence of uncertainty on the fluid propagation velocity in the concentration dynamics and explore possible practial applications in case-studies of engineering, environmental and soil sciences.

https://doi.org/10.5540/tcam.2022.023.04.00731

Health Professionals and the Dynamics of COVID-19 in Manaus during the First Wave
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BASSANEZI, R. C.

; TAKAHASHI, L. T.

; SOARES, A. L. O.

; LUIZ, M. H. R.

; SOUZA, S. D. DE

; GOMES, D. F.

Trends in Computational and Applied Mathematics

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Jul 2022, Volume 23 Nº 3 Páginas 499 - 513

Resumo: En | Texto: En | PDF: En

ABSTRACT A model is made for the dynamics of the transmission of the new SARS-CoV-2 coronavirus, which caused the COVID-19 pandemic. This model is based on the Susceptible-Infectious-Recovered model with heterogeneity in the susceptible population and in the infectious population. The susceptible population is divided into two subpopulations: individuals who are health professionals and individuals who are not. The infectious population is also divided into two subpopulations: individuals who are hospitalized and individuals who are not. A qualitative analysis of the theoretical model is performed, as well as simulations with official data regarding COVID-19 in the city of Manaus, Amazonas, Brazil, which corroborate the profile of the solution curves defined by the model.

https://doi.org/10.5540/tcam.2022.023.03.00499

Inclusion of licuri cake in high-grain diets for steers: Intake, digestibility, carcass characteristics, and meat quality
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de Oliveira, A. B.

; da Silva, F. F.

; da Silva, J. W. D.

; de Carvalho, G. G. P.

; Santos, L. V.

; Paixão, T. R.

; da Silva, A. P. G.

; de Souza, S. O.

; Soares, C.

; de Lima Júnior, D. M.

; Silva, R. R.

South African Journal of Animal Science

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2022, Volume 52 Nº 5 Páginas 603 - 610

Resumo: En | Texto: En | PDF: En

A high-grain diet is essential to maximize growth and yield as well as to provide high-quality meat in beef cattle. This study evaluated the effects of including licuri cake in high-grain diets for steers on performance and carcass and meat quality. Forty-four crossbred (1/2 Bos taurus χ 1/2 Bos indicus) castrated steers at 24 months of age, with an initial weight of 358.19 ± 41.57 kg, were used. The animals were distributed into four treatments that consisted of diets including licuri cake (0, 85, 170, or 255 g/kg, dry matter basis). Dry matter intake and digestibility decreased with the inclusion of licuri cake in the diet. However, the addition of the ingredient did not influence the intakes of total digestible nutrients (6.7 ± 0.5 kg/day) or crude protein. Licuri cake inclusion did not influence weight gain (1.5 ± 0.2 kg/day) or hot carcass weight (255.1 ± 24.9 kg). There was also no effect on carcass fat thickness, whereas the cholesterol content in the meat decreased with the addition of the cake. We recommend the inclusion of up to 255 g/kg licuri cake in the diet of feedlot steers fed high-concentrate diets.

https://doi.org/10.4314/sajas.v52i5.04

Algoritmo GVNS Híbrido Aplicado ao Problema das p-Medianas Capacitado
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VASCONCELOS, A. M.

; SOUZA, M. J. F.

; SOUZA, S. R. DE

Trends in Computational and Applied Mathematics

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Set 2021, Volume 22 Nº 3 Páginas 453 - 473

Resumo: Pt En | Texto: Pt En | PDF: Pt | PDF: En

RESUMO O Problema das p-Medianas Capacitado (PPMC) consiste em localizar p facilidades em uma rede composta por n vértices e decidir qual facilidade atenderá cada vértice, a fim de minimizar a soma de todas as distâncias de cada facilidade para cada vértice e atender às restrições de capacidade máxima de cada facilidade. Neste trabalho, dado que o PPMC é da classe NP-difícil, quatro variantes da metaheurística General Variable Neighborhood Search (GVNS) são implementadas para resolver o PPMC: G-VND, G-RVND, GG-VND e GG-RVND. Elas diferem entre si com relação ao método usado para construir uma solução inicial e o usado para a busca local. Nas duas primeiras variantes, a solução inicial é gerada de forma aleatória e o método de busca local é feita via Variable Neighborhood Descent (VND) ou Random Variable Neighborhood Descent (RVND), respectivamente. Por sua vez, nas duas últimas, a solução inicial é feita via a fase de construção do método Greedy Randomized Adaptive Search Procedure (GRASP). Usando instâncias padrões de teste da literatura, mostramos, inicialmente, que a variante GG-VND teve melhor desempenho quando comparada com as demais. Em seguida, mostramos que, quando comparada com os algoritmos da literatura, esta variante possui desempenho equivalente ou superior.

ABSTRACT The Capacitated p-Median Problem (CPMP) consists of locating p facilities in a network composed of n clients and deciding which facility will serve each client to minimize the sum of all distances from each facility to each client and meet the facility capacity constraints. Since the CPMP belongs to the NP-hard class, in this work, four variants of the General Variable Neighborhood Search (GVNS) metaheuristic, named G-VND, G-RVND, GG-VND, and GG-RVND, are implemented for treating the CPMP. They differ concerning the method used to build an initial solution and the one used for local search. In the first two variants, the initial solution is generated randomly, and the local search method is performed via Variable Neighborhood Descent (VND) or Random Variable Neighborhood Descent (RVND), respectively. In turn, in the last two, the initial solution is executed via the construction phase of the Greedy Randomized Adaptive Search Procedure (GRASP) method. Using benchmark instances from the literature, we initially showed that the GG-VND variant performed better than others. Then, we show that this variant has an equivalent or superior performance when compared with the literature algorithms.

https://doi.org/10.5540/tcam.2021.022.03.00453 673 downloads

A Novel Fully Integrated 4-Bit IFM Subsystem Using Band-Stop Filters
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Souza, S. R. O de

; Souza, M. F. A de

; Pontes, L. P.

; Melo, M. T. de

; Llamas-Garro, Ignacio

Journal of Microwaves, Optoelectronics and Electromagnetic Applications

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Set 2020, Volume 19 Nº 3 Páginas 396 - 406

Resumo: En | Texto: En | PDF: En

Abstract In this paper a 2-4 GHz microstrip IFM (Instantaneous Frequency Measurement) subsystem that uses Wilkinson power dividers, frequency discriminators based on band-stop filters and a DC arduino section is reported. The device uses band-stop filters as an alternative to delay lines, commonly used for IFM. The resonators are responsible for frequency adjustment, according to half guided wavelength resonator length, and the distance between the transmission line and the resonator. A fully micro-controlled 125 MHz resolution IFM subsystem is designed and tested. Results of the IFM subsystem composed by filters, 4-way power dividers and an Arduino board are described.

https://doi.org/10.1590/2179-10742020v19i3843 340 downloads

Sexto reporte de eventos adversos con tratamientos biológicos en Argentina: Informe del registro BIOBADASAR
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Gómez, G.

; Pons-Estel, G.

; Citera, G.

; Soriano, E.

; Saurit, V.

; Benavidez, F.

; Velozo, E.

; Dubinsky, D.

; Exeni, I.

; Gobi, C.

; Gómez, G.

; Díaz, M.

; Granel, A.

; Smichowsky, A.

; Garate, G.

; Quinteros, A.

; Cavillon, E.

; Petkovic, I.

; Larroude, M.S.

; de la Sota, M.

; Cappuccio, A.M.

; Berbotto, G.

; Alvarez, A.

; Papasidero, S.

; Lazaro, A.

; Garcia, M.

; Sacnun, M.

; Soares de Souza, S.

; Bertoli, A.

; Bejarano, V.

; Rillo, O.

; Kerzberg, E.

; Quintana, R.

; Agüero, S.

; Somma, L.

; Cruzat, V.

; Battaglitti, C.

; Perez Dávila, A.

; Gallardo, M.

; Pereira, D.

; Verando, M.

; Paira, S.

; Martinez, L.

; Aste, N.

; Pisoni, C.

; Catay, E.

; Graf, C.

; Casado, G.

; de la Vega, M.

Revista argentina de reumatología

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Mar 2019, Volume 30 Nº 1 Páginas 4 - 9

Resumo: En Es | Texto: En Es | PDF: En | PDF: Es

Objective: Update the results of the BIOBADASAR registry on safety, duration and causes of treatment interruption after 8 years of follow-up. Methods: BIOBADASAR is a safety record of biological therapies established by the Argentine Society of Rheumatology. The description of BIOBADASAR 3.0 is presented, a cohort of 53 centers in Argentina followed prospectively from August 2010 to January 2018. Results: 4656 patients were registered, 6234 treatments [3765 cases (therapy with biologicals) and 2469 controls (non-biological therapy)]. Treatment was interrupted in 44.6% in cases vs. 27.9% in controls. Main cause of discontinuation was due to inefficiency (40% cases vs. 32% controls). There were 3154 adverse events (2230 in cases vs. 924 in controls), of which 13.6% were tombs (9.8% in cases and 3.7% in controls). The most frequent adverse event (AE) in both groups were infections (43.56% in cases vs. 34.31% in controls, RR: 3.42, 95% CI: 3.02-3.88), and the upper airway pathways (14.5%). Neoplasms were published in 78 cases versus 45 controls (RR: 1.98, 95% CI: 1.37-2.86). Conclusions: In this article, there are no different trends regarding safety, duration and causes of interruption of treatment compared to previous reports. Infections were the main causes of treatment discontinuation. The advent of new biological agents and the need for control over long-term security, strengthens the use of this type of registration.

Objetivo: Actualizar los resultados del registro BIOBADASAR sobre seguridad, duración y causas de interrupción del tratamiento luego de 8 años de seguimiento. Métodos: BIOBADASAR es un registro de seguridad de terapias biológicas establecido por la Sociedad Argentina de Reumatología. Se presenta la descripción de BIOBADASAR 3.0, una cohorte compuesta por 53 centros de Argentina seguidos prospectivamente desde agosto de 2010 hasta enero de 2018. Resultados: Se registraron 4656 pacientes, 6234 tratamientos [3765 casos (terapia con biológicos) y 2469 controles (terapia no biológicos)]. Se interrumpió el tratamiento en el 44,6% en los casos vs. 27,9% en los controles. Causa principal de discontinuación fue por ineficacia (40% casos vs. 32% controles). Se presentaron 3154 eventos adversos (2230 en casos vs. 924 en controles), de los cuales el 13,6% fueron graves (9,8% en casos y 3,7% en controles). El evento adverso (EA) más frecuente en ambos grupos fueron las infecciones (43,56% en casos vs. 34,31% en los controles, RR: 3,42; IC 95%: 3,02-3,88), y de ellas las de vías aéreas superiores (14,5%). Las neoplasias se presentaron en 78 casos vs. 45 en controles (RR: 1,98; IC 95%: 1,37-2,86). Conclusiones: En este sexto reporte no se observan tendencias diferentes sobre seguridad, duración y causas de interrupción del tratamiento respecto a informes previos. Las infecciones fueron el principal EA y la ineficacia, seguido por EA y la pérdida de pacientes las principales causas de suspensión del tratamiento. El advenimiento de nuevos agentes biológicos y la necesidad de control en seguridad a largo plazo, fortalece el uso de este tipo de registro.

197 downloads

Removal of reactive blue 21 and reactive red 195 dyes using horseradish peroxidase as catalyst
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Farias, S.

; Oliveira, D. de

; Souza, A. A. Ulson de

; Souza, S. M. A. Guelli U. de

; Morgado, A. F.

Brazilian Journal of Chemical Engineering

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Jul 2017, Volume 34 Nº 3 Páginas 701 - 707

Resumo: En | Texto: En | PDF: En

Abstract-Textile effluent is rich in hydrolyzed dyes that need to be removed. This study presents an evaluation of the potential of the enzyme horseradish peroxidase to remove the hydrolyzed dyes Reactive Blue 21 (RB 21) and Reactive Red 195 (RR 195) from cotton fiber and the effluent of the dyeing process. The parameters pH, dye concentration and temperature were evaluated to determine the optimal conditions to remove the dyes. The studies of removal of the dyeing effluent led to an increase of degradation for all tested colors. The use of the enzyme horseradish peroxidase as a biocatalyst can be a viable technological alternative to remove some hydrolyzed dyes.

https://doi.org/10.1590/0104-6632.20170343s20160091 2428 downloads

10.

LINEAR STABILITY ANALYSIS AND CFD SIMULATION OF DOUBLE-LAYER RAYLEIGH-BÉNARD CONVECTION
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Fontana, É.

; Mancusi, E.

; Souza, A. A. Ulson De

; Souza, S. M. A. Guelli U.

Brazilian Journal of Chemical Engineering

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Set 2016, Volume 33 Nº 3 Páginas 607 - 616

Resumo: En | Texto: En | PDF: En

Abstract Natural convection in superimposed layers of fluids heated from below is commonly observed in many industrial and natural situations, such as crystal growth, co-extrusion processes and atmospheric flow. The stability analysis of this system reveals a complex dynamic behavior, including the potential multiplicity of stationary states and occurrence of periodic regimes. In this study, a linear stability analysis (LSA) was performed to determine the onset of natural convection as a function of imposed boundary conditions, geometrical configuration and specific perturbations. To investigate the effects of the non-linear terms neglected in LSA, a direct simulation of the full nonlinear problem was performed using computational fluid dynamics (CFD) techniques. The numerical simulation results show an excellent agreement with the LSA results near the onset of convection and an increase in the deviation as the Rayleigh number increases above the critical value.

https://doi.org/10.1590/0104-6632.20160333s20150050 2433 downloads

11.

Germinação de sementes de Aspidosperma subincanumMart. ex A. DC em diferentes temperaturas
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OLIVEIRA, A. K. M.

; CARVALHO, J. M. B.

; SOUZA, J. S.

; SOUZA, S. A.

Revista Brasileira de Plantas Medicinais

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Dez 2015, Volume 17 Nº 4 Páginas 642 - 648

Resumo: Pt En | Texto: Pt En | PDF: Pt | PDF: En

RESUMOAspidosperma subincanum é uma espécie arbórea utilizada em projetos de recuperação de áreas degradadas e como planta medicinal. Levando-se em consideração a importância da espécie, o presente trabalho teve como objetivo definir a temperatura ideal para a germinação de suas sementes. O material vegetal foi coletado na região do Pantanal de Miranda, Mato Grosso do Sul. As sementes foram colocadas em caixas plásticas transparentes em câmara de germinação e submetidas às temperaturas constantes de 20, 25, 30 e 35˚C e alternadas de 20-30 e 25-35˚C. O delineamento experimental foi inteiramente casualizado, com quatro repetições por tratamento, sendo as médias comparadas pelo teste de Tukey a 5%. A temperatura ideal para a germinação de Aspidosperma subincanum foi a 25˚C, com o maior índice de velocidade de germinação, 18,8. Temperaturas mais elevadas (30 e 35˚C) causaram a morte dos embriões.

ABSTRACTThe Aspidosperma subincanumem is a tree species used in the recovery of degraded areas projects and as a medicinal plant. Taking into account the importance of the species, the current study aimed to determine which would be the ideal temperature for the germination of their seeds. The plant material was collected in the Pantanal of Miranda, Mato Grosso do Sul. The seeds were placed in transparent boxes in germination chambers and submitted to constant temperatures of, 20, 25, 30 and 35˚C and alternated at 20-30 and 25-35˚C, with four replicates per treatment. The statistical design was a completely randomized one. The averages were compared by Tukey test at 5%. The ideal temperature for germination of Aspidosperma subincanumwas 25˚C. The high temperatures (30 and 35˚C) have caused the death of embryos.

https://doi.org/10.1590/1983-084X/14_082 1933 downloads

12.

Basic life support knowledge of first-year university students from Brazil
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Santos, S. V.

; Margarido, M. R. R. A.

; Caires, I. S.

; Santos, R. A. N.

; Souza, S. G.

; Souza, J. M. A.

; Martimiano, R. R.

; Dutra, C. S. K.

; Palha, P.

; Zanetti, A. C. G.

; Pazin-Filho, A.

Brazilian Journal of Medical and Biological Research

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Dez 2015, Volume 48 Nº 12 Páginas 1151 - 1155

Resumo: En | Texto: En | PDF: En

We aimed to evaluate knowledge of first aid among new undergraduates and whether it is affected by their chosen course. A questionnaire was developed to assess knowledge of how to activate the Mobile Emergency Attendance Service - MEAS (Serviço de Atendimento Móvel de Urgência; SAMU), recognize a pre-hospital emergency situation and the first aid required for cardiac arrest. The students were also asked about enrolling in a first aid course. Responses were received from 1038 of 1365 (76.04%) new undergraduates. The questionnaires were completed in a 2-week period 1 month after the beginning of classes. Of the 1038 respondents (59.5% studying biological sciences, 11.6% physical sciences, and 28.6% humanities), 58.5% knew how to activate the MEAS/SAMU (54.3% non-biological vs 61.4% biological, P=0.02), with an odds ratio (OR)=1.39 (95%CI=1.07-1.81) regardless of age, sex, origin, having a previous degree or having a relative with cardiac disease. The majority could distinguish emergency from non-emergency situations. When faced with a possible cardiac arrest, 17.7% of the students would perform chest compressions (15.5% non-biological vs 19.1% biological first-year university students, P=0.16) and 65.2% would enroll in a first aid course (51.1% non-biological vs 74.7% biological, P<0.01), with an OR=2.61 (95%CI=1.98-3.44) adjusted for the same confounders. Even though a high percentage of the students recognized emergency situations, a significant proportion did not know the MEAS/SAMU number and only a minority had sufficient basic life support skills to help with cardiac arrest. A significant proportion would not enroll in a first aid course. Biological first-year university students were more prone to enroll in a basic life support course.

https://doi.org/10.1590/1414-431x20154667 3059 downloads

13.

Utilização de embalagens Tetra Pak® como isolante térmico no revestimento de escamoteadores para leitões
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Sartor, K.

; Sarubbi, J.

; Lazzari, R.

; Souza, S.

; Paim, R. W.

; Medeiros, B. B. L.

Arquivo Brasileiro de Medicina Veterinária e Zootecnia

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Out 2015, Volume 67 Nº 5 Páginas 1449 - 1456

Resumo: Pt En | Texto: Pt En | PDF: Pt | PDF: En

RESUMOForam conduzidos dois experimentos em laboratório e em condições de campo para avaliação da eficiência térmica da embalagem Tetra Pak(r)como isolante térmico em escamoteadores aquecidos. No experimento em laboratório, foi utilizado o delineamento inteiramente ao acaso, adotando-se dois tratamentos (com e sem revestimento de embalagens Tetra Pak(r)) com 15 repetições (dias). O experimento em condições de campo foi conduzido na sala de maternidade de suínos. O delineamento foi inteiramente ao acaso, adotando-se dois tratamentos com 12 repetições. Os tratamentos foram: escamoteadores aquecidos com e sem revestimento interno com embalagem Tetra Pak(r). Foram medidos os dados de temperatura ambiente, umidade relativa do ar, temperatura superficial do piso, temperatura superficial da pele, comportamento e ganho de peso dos leitões lactentes. O uso da embalagem Tetra Pak(r)como isolante térmico no revestimento de escamoteadores manteve a temperatura ambiente confortável (32°C), proporcionando conforto térmico aos leitões lactentes.

ABSTRACTTwo experiments were conducted in laboratory and field conditions to evaluate the thermal efficiency of the Tetra Pak packaging as insulation in heated creeps. In the laboratory experiment a completely randomized design was used, adopting two treatments (with and without packaging coating with Tetra Pak(r)) with 15 repetitions (days). The experiment under field conditions was conducted in a swine nursery. The design was completely randomized, adopting two treatments with 12 repetitions. The treatments consisted of heated creep with and without Tetra Pak(r) lining. The data measured were ambient temperature, relative humidity, surface temperature of the floor, surface temperature of skin, behavior and weight gain of suckling piglets. The use of Tetra Pak(r) packaging as insulation in creep coating maintained the ambient temperature comfortable (32 °C), providing thermal comfort to suckling piglets.

https://doi.org/10.1590/1678-4162-6732 3107 downloads

14.

MODELING AND SIMULATION OF THE EFFECT OF THE FIRING CURVE ON THE LINEAR SHRINKAGE OF CERAMIC MATERIALS: LABORATORY SCALE AND INDUSTRIAL SCALE
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Cargnin, M.

; Ulson de Souza, S. M. A. G.

; Ulson de Souza, A. A.

; De Noni Jr., A.

Brazilian Journal of Chemical Engineering

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Jun 2015, Volume 32 Nº 2 Páginas 433 - 443

Resumo: En | Texto: En | PDF: En

AbstractSingle-cycle firing is currently the most widespread method used for the production of ceramic tile. The productivity is directly related to the performance of the constituent materials of the ceramic piece during thermal cycling. Numerical tools which allow the prediction of the material behavior may be of great help in the optimization of this stage. This study addressed the mathematical modeling of the temperature profile within a ceramic tile, together with the sintering kinetics, to simulate the effect of the thermal cycle on the final size. On the laboratory scale, 80 mm x 20 mm specimens with thicknesses of 2.3 mm and 7.8 mm were prepared in order to determine the kinetic constants and validate the model. The application was carried out on an industrial scale, with 450 mm x 450 mm pieces that were 8.0 mm thick. These results show that the model was capable of predicting the experimental results satisfactorily.

https://doi.org/10.1590/0104-6632.20150322s00002876 5401 downloads

15.

Influence of bloom number and plastifiers on gelatin matrices produced for enzyme immobilization
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Kempka, A. P.

; Souza, S. M. A. G. Ulson de

; Ulson de Souza, A. A.

; Prestes, R. C.

; Ogliari, D.

Brazilian Journal of Chemical Engineering

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Mar 2014, Volume 31 Nº 1 Páginas 95 - 108

Resumo: En | Texto: En | PDF: En

In this study the immobilization of lipase in matrices produced with gelatin with different Bloom values and with the addition of plastifiers was investigated to evaluate the influence of the Bloom value, as well as the capacity of the plastifiers to maintain the enzyme immobilized and the immobilization yield. The results indicated the need for crosslinking of the matrices with glutaraldehyde due to the high solubility in water, explained by the amino acid profile, which confirms the solubility of gelatin. Mannitol showed greater efficiency in the lipase immobilization, since it led to more porous structures and more uniform pores. These structures were also influenced by the gelatin concentration; greater concentrations associated with intermediate concentrations of plastifier led to matrices with a greater immobilization yield (87.92%). The X-ray diffraction analysis revealed that the structure of the immobilization matrices was partially crystalline.

6476 downloads Citado 1 vez em SciELO

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