oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

4 ( 1 )

2019 ( 64 )

2018 ( 137 )

2017 ( 132 )

Custom range...

Search Results: 1 - 10 of 85068 matches for " Ant?nio Carlos Silveira Gon?alves "
All listed articles are free for downloading (OA Articles)
Page 1 /85068
Display every page Item
Perfil lipídico e composi o química de tilápias nilóticas em diferentes condi es de cultivo Lipid profile and chemical composition of Nile tilapia under different raising conditions
Paula Adriane Perez Ribeiro,Priscila Vieira e Rosa,Jodnes Sobreira Vieira,Antnio Carlos Silveira Gonalves
Revista Brasileira de Saúde e Produ??o Animal , 2011,
Abstract: Objetivou-se com este trabalho avaliar o perfil lipídico e a composi o química dos filés de tilápia nilótica (Oreochromis niloticus) mantida em três condi es de cultivo, por um período de 120 dias. Foram utilizados 2075 machos sexados de tilápia, distribuídos em dois tanques de terra e um tanque de alvenaria. Os tratamentos aplicados foram: dieta base em tanque de alvenaria; dieta base em tanque de terra e alimenta o natural por meio de fertiliza o química e organica em tanque de terra. O delineamento experimental foi inteiramente casualizado, com três tratamentos e dez repeti es. Os parametros avaliados foram: identifica o do plancton, perfil de ácidos graxos e teores de umidade, proteína bruta, extrato etéreo e cinzas dos filés. Os dados obtidos foram submetidos à análise de variancia e as médias dos tratamentos foram comparadas pelo teste de Tukey (5% de significancia). Foram encontrados cinco gêneros distintos de zooplancton e quatro gêneros de fitoplancton predominantes. Os resultados demonstraram n o haver diferen a estatística para o teor de umidade e cinzas dos filés. Porém, os animais mantidos no sistema fertilizado apresentaram filés com maior teor de proteína bruta e menor teor lipídico, além de uma melhor rela o mega-3/ mega-6, com maiores quantidades de DHA (ácido graxo docosahexaenóico). This study aimed to evaluate the lipid profile and the chemical composition of the fillets of Nile tilapia (Oreochromis niloticus) maintained under three raising conditions, for a period of 120 days. A total of 2075 sexed males of tilapia were utilized, allotted into two ponds and one alvenaria pond. The applied treatments were: feeding with a basal diet in the alvenaria pond; feeding with the basal diet in the earthen pond and natural feeding through chemical and organic fertilization. The experimental design was in a completely randomized design, with three treatments and ten replicates. The evaluated parameters were: identification of plankton, profile of fatty acids and contents of moisture, crude protein, etereo extract and ashes of the fillets. The data were subjected to analysis of variance and the means of the treatments were evaluated by Tukey′s test (5% of significance). A total of five predominant distinct genera of zooplankton and four genera of phytoplankton were found. The results shown any statistical differences for the moisture and ashes contents of the fillets over all treatments tested. Therefore only the animals raised under the fertilization system shown increased crude protein content and decreased lipid content. The fatty aci
Desempenho produtivo de tambacus alimentados com dietas suplementadas com vitamina E
Gonalves, Antnio Carlos Silveira;Murgas, Luis David Solis;Rosa, Priscila Vieira e;Navarro, Rodrigo Diana;Costa, Diego Vicente da;Teixeira, Edgar de Alencar;
Pesquisa Agropecuária Brasileira , 2010, DOI: 10.1590/S0100-204X2010000900010
Abstract: the objective of this work was to evaluate the effects of tambacu vitamin e dietary supplementation on performance and hematological variables, and determine the relationship of glutathione peroxidase activity with vitamin e and selenium suplementation. two hundred and fifty juvenile tambacus were used, divided into 25 aquaria. the basal diet was pelleted with 32% of crude protein and 3,300 kcal kg-1 of digestible energy, with 0.40 mg kg-1 se. test diets - isoproteic and isocaloric - were composed of the basal diet with increasing vitamin e concentrations (0, 100, 200, 300, 400 mg kg-1), in a completely randomized design, with five treatments and five replications. no significant effect of vitamin e supplementation was observed on total length, mean corpuscular volume, mean corpuscular hemoglobin concentration and total erythrocyte, and on the enzymatic activity of glutathione peroxidase. however, final weight and apparent feed conversion were significantly affected by supplemented treatments. standard length and weight gain improved using diets supplemented with 400 mg kg-1 of vitamin e. dietary vitamin e supplementation results in better tambacu performance.
Pré-eclampsia precoce e tardia: uma classifica??o mais adequada para o prognóstico materno e perinatal?
Reis, Zilma Silveira Nogueira;Lage, Eura Martins;Teixeira, Patrícia Gonalves;Porto, Ludmila Barcelos;Guedes, Ludmila Resende;Oliveira, érica Carla Lage de;Cabral, Antnio Carlos Vieira;
Revista Brasileira de Ginecologia e Obstetrícia , 2010, DOI: 10.1590/S0100-72032010001200004
Abstract: purpose: to evaluate the differences between the maternal and perinatal outcomes of pregnancies complicated by preeclampsia, according to the classification as the severe/mild form, and the early/late onset form. methods: a retrospective study with 211 pregnancies complicated by preeclampsia, assessed at a university reference center from 2000 to 2010. the diagnosis and disease severity were based on the values of blood pressure, proteinuria, and clinical and laboratory findings. the pregnant's age, skin color, parity, blood pressure, urine protein semiquantitative values, presence of bilateral notch in the uterine artery dopplervelocimetry and birth conditions were compared between patients with mild and severe disease, as well as between those of early/late onset. the disease was considered to be of early onset when diagnosed at less than 34 weeks of gestational age. results: most patients had the severe form of preeclampsia (82.8%), and the onset of the condition was early in 50.7%. blood pressure values (133.6±14.8 versus 115.4 mmhg, p=0.0004 and 132.2±16.5 versus 125.7 mmhg, p=0.0004) and semiquantitative proteinuria (p=0.0003 and p=0.0005) were higher in the early and severe forms compared to mild and late forms. infant birth weight (1,435.4±521.6 versus 2,710±605.0 g, 1,923.7±807.9 versus 2,415.0±925.0 g, p<0.0001 for both) and apgar score (p=0.01 for both) were smaller for severe and early preeclampsia compared to mild and late preeclampsia. on the other hand, the presence of a bilateral notch in the uterine arteries was linked to the forms of early onset (69.2 versus 47.9%, p=0.02), whereas fetal growth restriction was more frequent in the severe forms of preeclampsia (30 versus 4.4%, p=0.008). conclusion: the preeclampsia classification based on maternal clinical parameters better reflected the conditions of fetal nutrition, while the early onset of the condition was associated with placental vasculopathy detected by dopplervelocimetry.
Rotational Oscillation Effect on Flow Characteristics of a Circular Cylinder at Low Reynolds Number  [PDF]
Alice Rosa da Silva, Aristeu da Silveira-Neto, Antnio Marcos Gonalves de Lima
World Journal of Mechanics (WJM) , 2015, DOI: 10.4236/wjm.2015.510019
Abstract: Two dimensional numerical simulations of flow around a rotationally oscillating circular cylinder were performed at Re = 1000. A wide range of forcing frequencies, fr, and three values of oscillation amplitudes, A, are considered. Different vortex shedding modes are observed for a fixed A at several values of fr, as well as for a fixed fr at different values of A. The 2C mode of vortex shedding was obtained in the present study. It is important to point out that this mode has not been observed by other investigators for rotationally oscillating case. Also, it is verified that this mechanism has great influence on the drag coefficient for high frequency values. Furthermore, the lift and pressure coefficients and the power spectra density are also analyzed.
Comparative Study of Endothelial Function and Uterine Artery Doppler Velocimetry between Pregnant Women with or without Preeclampsia Development
Augusto Henriques Fulgêncio Brand?o,Ludmila Maria Guimar?es Pereira,Alessandra Cristina de Oliveira Gonalves,Zilma Silveira Nogueira Reis,Henrique Vítor Leite,Antnio Carlos Vieira Cabral
Journal of Pregnancy , 2012, DOI: 10.1155/2012/909315
Abstract: Background. Poor placentation and systemic endothelial dysfunction have been identified as main events in Preeclampsia (PE). The relationship and chronology of these phenomena are important if we are to understand the pathophysiological mechanisms underlying this major clinical problem. Objectives. To compare the evolution of placentation and endothelial function in normotensive and preeclamptic pregnancies. Patients and methods. In a prospective cohort study, 59 pregnant women with a high risk of developing PE were subjected to flow-mediated dilation (FMD) and to Doppler velocimetry of uterine arteries in order to obtain their Pulsatility Index (UtA-PI). The variations in the FMD and UtA-PI values, between 16+0 and 19+6 and 24+0 and 27+6 weeks of gestation, were compared, taking PE development into consideration. Results. Nine patients developed PE and the other 50 women remained normotensive. At 16+0 to 19+6 weeks of pregnancy, patients that developed PE presented higher values of UtA-PI than the normotensive group, but there was no difference in FMD results between them. At 24+0 to 27+6 weeks, the patients that developed PE presented higher values of UtA-PI and lower values of FMD than the women that remained normotensive. Conclusions. These results corroborate the evidence that endothelial injury is secondary to poor placentation. 1. Introduction Preeclampsia (PE) is a multisystemic disorder that accounts for a large number of maternal deaths in developed and developing countries worldwide [1–3]. Although its etiology remains unclear, several events in PE physiopathology are well studied and can be evaluated using biochemical or biophysical methods. In order to prevent PE complications, there are many early detection markers, which include maternal demographics, past medical, obstetric, family history, and some current pregnancy characteristics [4–6]. Maternal factors and history alone can be used as a PE risk stratification method. Elevated body mass index, maternal age extremes and Afro-American ethnicity are associated with a higher risk of PE [7]. Some diseases such as diabetes and chronic hypertension also significantly increase the risk [8]. The patients that present these conditions are the ones who will most benefit from a satisfactory and specific level of care, once the risk of developing PE in this groups rises threefold, reaching a PE prevalence of 45% [3]. Preeclampsia is essentially an endothelial disease [9, 10]. Progressive endothelial dysfunction leads to arterial hypertension, glomerular lesion, hepatic failure, and cerebral edema
Orthogonal cutting forces in juvenile and mature Pinus taeda wood
Gonalves, Raquel;Néri, Antnio Carlos;
Scientia Agricola , 2005, DOI: 10.1590/S0103-90162005000400002
Abstract: the distinct characteristics of juvenile and mature woods, which are observed particularly in softwoods, have an influence on processing due to their different mechanical resistance properties in relation to cutting operations. in the past, when most of the wood used industrially came from adult trees of natural forests, little importance was given to a distinction between different zones of the tree stem. at present, however, as the supply of mature trees with large diameters from native forests is constantly decreasing, the use of short-cycle trees has become a common practice, through the adoption of species that grow relatively fast, such as pines and eucalyptus. in both softwoods and hardwoods, juvenile wood cells are generally smaller and thinner than in mature wood, and this reflects on their density and mechanical resistance, which should have an effect on the cutting forces developed during processing. the main object of this research was to evaluate orthogonal cutting forces in juvenile and mature pinus taeda woods. cutting force magnitude differences were observed for those two regions of the trunk, with parallel cutting forces being 33.4% higher, on average, at the mature wood region for 90-0 cutting, and 12% higher for 90-90 cutting. this result is consistent with the distinct anatomical structures of the material, since the forces developed during machining depend directly upon its properties.
Variabilidade e correla??o espacial de propriedades físicas de solo sob plantio direto e preparo convencional
Schaffrath, Valter Roberto;Tormena, Cássio Antnio;Fidalski, Jonez;Gonalves, Antnio Carlos Andrade;
Revista Brasileira de Ciência do Solo , 2008, DOI: 10.1590/S0100-06832008000400001
Abstract: soil management systems modify the spatial distribution of soil physical properties. the objectives of this study were to verify the spatial dependency and co-relationship of some soil physical properties by data fitting to individual and cross-semivariograms in an oxisol (typic haplorthox) under no-till and conventional tillage, in campo mour?o, state of parana, brazil. in april 2004, 128 undisturbed soil samples were collected in a 3 x 5 m grid, in the middle of the 5-0.15 m layer. the following soil physical properties were measured: soil bulk density, macroporosity, microporosity, total soil porosity and soil water content at a tension of 100 hpa (field capacity). the spatial variability in the single semivariogram of these soil physical properties was higher and the range in no-tillage was smaller than in conventional tillage. on the other hand, the cross-semivariogram of soil bulk density and total porosity or field capacity indicated spatial co-relationships with lower spatial variability and higher ranges in no-tillage than conventionally tilled soils. the cross-semivariogram suggested that soil bulk density showed a spatial co-relationships with the other soil physical properties in both soil management systems studied.
Drop Size Measurements in a Laboratory Scale Venturi Scrubber
Alonso, Diego Fernández;Azzopardi, Barry J.;Gonalves, José Antnio Silveira;Coury, José Renato;
Journal of the Brazilian Society of Mechanical Sciences , 2001, DOI: 10.1590/S0100-73862001000400008
Abstract: venturi scrubbers are high efficiency gas cleaners in which suspended particles are removed from gas streams by droplets formed by liquid atomisation, usually in the venturi throat. the size of the droplets formed is of fundamental importance to the performance of the equipment, both in terms of pressure drop and collection efficiency. in this study, drop sizes in a cylindrical laboratory scale venturi scrubber were measured using a laser diffraction technique. gas velocity and liquid to gas ratios varied from 50 to 90 m/s and 0.5 to 2.0 l/m3, respectively. water was inserted as perpendicular jets at the beginning of the throat. measurements were performed at three positions: two located along the throat, and the last one at the end of the diffuser. the data presented here are a typical example of pneumatic atomisation and can be relevant to other industrial applications such as combustion and engine technology. finally, results are compared to available correlations and the validity of these equations is discussed.
Drop Size Measurements in a Laboratory Scale Venturi Scrubber
Alonso Diego Fernández,Azzopardi Barry J.,Gonalves José Antnio Silveira,Coury José Renato
Journal of the Brazilian Society of Mechanical Sciences , 2001,
Abstract: Venturi scrubbers are high efficiency gas cleaners in which suspended particles are removed from gas streams by droplets formed by liquid atomisation, usually in the venturi throat. The size of the droplets formed is of fundamental importance to the performance of the equipment, both in terms of pressure drop and collection efficiency. In this study, drop sizes in a cylindrical laboratory scale venturi scrubber were measured using a laser diffraction technique. Gas velocity and liquid to gas ratios varied from 50 to 90 m/s and 0.5 to 2.0 l/m3, respectively. Water was inserted as perpendicular jets at the beginning of the throat. Measurements were performed at three positions: two located along the throat, and the last one at the end of the diffuser. The data presented here are a typical example of pneumatic atomisation and can be relevant to other industrial applications such as combustion and engine technology. Finally, results are compared to available correlations and the validity of these equations is discussed.
Controle genético da regenera??o in vitro em progênies de Eucalyptus grandis
Bravo, Carlos David Vera;Gonalves, Antnio Natal;Dias, Carlos Tadeu dos Santos;Vencovsky, Roland;
Ciência Rural , 2008, DOI: 10.1590/S0103-84782008000800014
Abstract: the genetic control of in vitro direct regeneration was tested on seedlings of ten open-pollinated progenies from the base population of atherton origin of eucalyptus grandis at university of s?o paulo (brazil). seeds were germinated in vitro, after twenty days, distal hypocotyls segments from 196 seedlings per progeny were inoculated in culture media at generalized complete randomized block design, with two experimental units per block and seven repetitions, using the interaction blocks by progenies as an estimate of the experimental error. at week 14 from the inoculation bud induction was evaluated. regeneration among progenies were significantly different (p<0.0001). regeneration varied from 11 to 60%. the narrow-sense heritability between means of experimental units for in vitro regeneration was height. (h2m=0.94), indicating a strong genetic control of the trait within the population and also a high maternal effect. high variability within the study sample was found.
Page 1 /85068
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.