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Search Results: 1 - 10 of 385978 matches for " Luiz Fernando de Oliveira e Silva;Oliveira "
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Caracteriza??o química e metalográfica dos a?os inoxidáveis de implantes removidos de pacientes
Silva, Elison da Fonseca e;Oliveira, Luiz Fernando Cappa de;
Acta Ortopédica Brasileira , 2011, DOI: 10.1590/S1413-78522011000500003
Abstract: objective: this study examines the chemical and metallographic composition (microstructure, grain size, inclusion content) of austenitic stainless steel developed as biomaterials for used in the manufacture of orthopedic implants. method: an analysis was carried out of twelve implants removed from patients affected by inflammation. chemical analyses were carried out using optical emission spectrometry and energy dispersive microanalysis (eds), and the grain size was determined by optical microscopy and scanning electron microscopy (sem) according to astm standard e 1382 97. results: it was observed that all the implants had a larger grain size than is recommended by the standard. the presence of delta ferrite was also observed in ten of the twelve implants removed, which according to astm standard f138-92, should not be perceived microscopically under magnification of 100x. conclusions: in eight cases, there is a strong indication that the inflammation was triggered by pitting corrosion. level of evidence: level iii, systematic review of studies.
Avalia??o da resistência à corros?o de implantes em a?os inoxidáveis ISO 5832-9 e F138 removidos de pacientes
Silva, Elison da Fonseca e;Oliveira, Luiz Fernando Cappa de;
Química Nova , 2012, DOI: 10.1590/S0100-40422012000100012
Abstract: this work has compared the surfaces of two different steel samples used as orthopedical implants, classified as astm f138 and iso5832-9, through optical emission spectroscopy, by means of sem and eds. the samples (implants) were also submitted to potentiodynamic cyclic polarization in ringer lactate and nacl 0.9 m l-1 solutions; iso5832-9 sample did not show any kind of localized corrosion, but in the case of f138 steel was observed a pit localized corrosion in both solutions. in ringer lactate solution it was observed a loss of about 63% for nickel and 26% for iron for f138 stell, compared to the initial composition.
Comparison of DNA-extraction methods and Selective Enrichment broths on the detection of Salmonella Typhimurium in swine feces by polymerase chain reaction (PCR)
Freschi, Carla Roberta;Carvalho, Luiz Fernando de Oliveira e Silva;Oliveira, Celso José Bruno de;
Brazilian Journal of Microbiology , 2005, DOI: 10.1590/S1517-83822005000400011
Abstract: the aim of this study was to compare different dna-extraction methods and selective enrichment broths for their effectiveness to detect salmonella typhimurium in artificially inoculated swine feces samples (100 cfu/g) by polymerase chain reaction. after enrichment in rappaport-vassiliadis, selenite cystine or müller-kauffmann tetrathionate, aliquots were used for dna extraction by three different methods: boiling-centrifugation, phenol-chloroform and salting-out. aliquots of extracted dna were then used as template in pcr. the selective enrichment broths had no effect on the efficiency of pcr when boiling-centrifugation and salting-out were used. on the other hand, phenol-chloroform was superior (p<0.05) when combined to rappaport-vassiliadis. considering cost and efficiency parameters, we encourage the use of müller-kauffmann tetrathionate broth in combination with boiling-centrifugation dna-extraction procedure.
CARACTERIZA O FíSICO-HíDRICA DE UM LATOSSOLO VERMELHO PERFéRRICO SUBMETIDO A DOIS SISTEMAS DE MANEJO DO SOLO PHYSICAL AND HYDRIC CHARACTERIZATION OF A ‘LATOSSOLO VERMELHO PERFéRRICO’ UNDER THE NO-TILLAGE SYSTEM AND CONVENTIONAL SOIL PREPARATION
Gisele de Macedo e Silva,Wilian Henrique Diniz Buso,Luiz Fernando Coutinho de Oliveira,Jorge Luiz do Nascimento
Pesquisa Agropecuária Tropical , 2007, DOI: 10.5216/pat.v31i2.2479
Abstract: Este trabalho teve como objetivo a caracteriza o física e hídrica de um latossolo vermelho perférrico submetido ao sistema de plantio direto e preparo convencional do solo. As amostras desolo foram coletadas no município de Santo Ant nio de Goiás (GO), em duas áreas irrigadas sob piv -central na área experimental da Embrapa Arroz e Feij o. Foram avaliados a textura, a porosidade total, macro e microporosidades, densidade do solo e de partículas, condutividade hidráulica do solo saturado, curva de reten o e umidade na capacidade de campo. A porosidade total, a macro e a microporosidades foram superiores no preparo convencional do solo, na camada de 0 - 0,15 m, quando comparado ao plantio direto. Apesar de a reten o de água no solo ter sido um pouco maior no plantio direto na camada superficial, a disponibilidade de água n o foi maior em rela o ao manejo convencional. PALAVRAS-CHAVE: Solo; plantio direto; reten o de umidade. This work had as objective the physical and hydric characterization of a ‘latossolo vermelho perférrico’ submitted to the system no-tillage and conventional preparation of the soil. The soil samples were collected in the municipal district of Santo Ant nio de Goiás (GO), in two areas irrigated under pivot-central. They were appraised the texture, the total porosity, macro and personal computer porosities, density of the soil and of particles, hydraulic conductivity of the saturated soil, curves of retention and humidity in the field capacity. The total porosity, to macro and personal computer porosities was superior in I prepare it conventional of the soil, in the layer of 0-0.15 m when compared to the no-tillage. In spite of the retention of water in the soil to have been a little larger in the no-tillage in the superficial layer, the readiness of water was not larger in relation to the conventional handling. KEY-WORDS: Soil; no-tillage; moisture retention.
Causas de mortalidade de leit?es neonatos em sistema intensivo de produ??o de suínos
Abrah?o, Abr?o Ant?nio Ferreira;Vianna, Wagner Loesch;Carvalho, Luiz Fernando de Oliveira e Silva;Moretti, Aníbal de Sant'Anna;
Brazilian Journal of Veterinary Research and Animal Science , 2004, DOI: 10.1590/S1413-95962004000200002
Abstract: two research was conducted to evaluate and to classify the occurrence of the preweaning losses (based on the postmortem findings) of piglets in an intense swine production system, at the west of s?o paulo state during the year 2000. among total piglets born alive. 7.19 % died during the first 24 suckling days, but most of them (5.63 %) died on the 1st week of life all over the year. the most important causes of losses were overlaying (2.61 %), weakness (1.45 %), diarrhea syndrome (1.10 %), and genetic defects (0.56 %), occurring mainly on the 1st week of life. stillbirth rate, in relation to total born, was 5.96 %. evidences indicated higher number of overlaying during the hottest months of the year, caused probably by the longer staying out of the piglet's pen. it was suggested some control measures to reduce the piglets mortality in order to maximize the productive efficiency of the system.
Emprego do flunitrazepam na seda??o de suínos
Marques, José Antonio;Carvalho, Luiz Fernando de Oliveira e Silva;Valad?o, Carlos Augusto Araújo;Nunes, Newton;Vaz, Beatriz Berlink d'Utra;
Ciência Rural , 1995, DOI: 10.1590/S0103-84781995000300013
Abstract: in this research, it was evaluated the flunitrazepam, at different doses, in the tranquilization of 24 landrace swines. the animais were distributed into 4 groups and, after a previous fasting, the cardiac and respiratory rates were recorded as well as the rectal temperature and blood gas analisis. just after that, the flunitrazepam was injected at dosages of 0.01; 0.02 and 0.03mg/kg im for the groups i, ii and iii, respectively. the group iv (control) received the same volume of saline (0.9%) intramuscularly. the parametrical and blood gas recordings were performed at 10 minute intervals after the drug administration, over an hour period. at the same time, observations were performed about the clinical efectiveness of the sedation. significant changes were not observed in cardiac and respiratory rates at different dosages apphed. the dosage of 0.03 mg/kg produced the best level of sedation, without significam changes in the blood gas values.
In situ degradability of corn stover and elephant-grass harvested at four stages of maturity
Silva, Luis Felipe Prada e;Cassoli, Laerte Dagher;Roma Júnior, Luiz Carlos;Rodrigues, Ana Carolina de Oliveira;Machado, Paulo Fernando;
Scientia Agricola , 2008, DOI: 10.1590/S0103-90162008000600005
Abstract: among tropical forages, corn silage is largely used by farmers trying to explore the maximum genetic potential from the animals. however, other tropical forages, such as elephant-grass (pennisetum purpureum), are more productive and therefore cheaper to use than corn silage. our objective was to compare the in situ degradability of elephant-grass with that from corn hybrids, all harvested at four stages of maturity. the experimental design followed a randomized block design with nested subplots. two corn hybrids: ag5011, zn8392 were harvested with 25, 30, 35, and 40% dry matter (dm) in the whole plant, and separated in stem + leaf sheath + leaf blade (stover), and cobs. elephant-grass was harvested with 30, 40, 50 and 60 days after a leveling cut. dried and ground samples were incubated in nylon bags inside the rumen for 0, 6, 12, 24, 48 and 72 h to estimate the kinetics of ruminal dm and neutral detergent fiber (ndf) degradation. the advance of maturity increased the ndf and acid detergent fiber (adf) content in elephant-grass, and reduced its dm degradability. however, maturity had little or no effect on fiber content and dm degradability of corn stover. elephant-grass had a higher ndf degradability than corn stover, and there was no effect of maturity on ndf degradability of either elephant-grass or corn stover. fiber degradability of elephant-grass was not worse than that of corn stover, and therefore the choice of forage should be made on economical analysis rather than assuming an intrinsic low production potential for elephant-grass based diets.
Esterco de gado leiteiro associado à aduba??o mineral e sua influência na fertilidade de um latossolo sob plantio direto
Silva, José Carlos Peixoto Modesto da;Motta, Ant?nio Carlos Vargas;Pauletti, Volnei;Veloso, Cristina Mattos;Favaretto, Nerilde;Barcellos, Milena;Oliveira, André Soares de;Silva, Luiz Fernando Costa e;
Revista Brasileira de Ciência do Solo , 2010, DOI: 10.1590/S0100-06832010000200019
Abstract: dairy cattle in south brazil is raised mainly in a system based on partial or total confinement of the animals, generating a significant amount of residues. the residues have been used as the only nutrient source or associated to mineral sources in grain or silage production. their effect on soil characteristics has however been little explored. this study was conducted to evaluate the influence of fertilization rates with liquid dairy cattle manure associated with mineral fertilizer on p, k, c, and electrical conductivity (ec) levels of a brown oxisol, under no-tillage and winter and summer crop rotation (sorghum/black-oat/corn/ryegrass/corn/ ryegrass) for silage production, in the layers 0-5, 5-10, 10-30, 30-50 and 50-80 cm. the treatments were distributed in three randomized blocks, each divided in 12 plots, in a 3 x 4 factorial arrangement, with three mineral fertilizer levels (0, 50 and 100 % of the dose recommended for the crops) and four organic fertilizer levels (0, 30, 60, and 90 m3 ha-1 year-1). mineral fertilizer resulted in higher values of available p (mehlich-1 and resin) to a depth of 10 cm, due to the fertilizer application in depth by the planter, whereas the highest values under manure surface application were restricted to the 0-5 cm layer. potassium depletion was observed along the soil profile due to high extraction by silage, and a linear ratio with available k level could be applied in the case of liquid manure at all depths. the lack of effect by the mineral fertilizer on k is probably due to the low rate of k application. a direct relationship was observed between manure rates and organic c concentration in the 0-5 cm layer, unlike in the case of mineral fertilizer. low ec values were obtained suggesting high nutrient exportation by silage production. results indicate that there was no significant p migration in the oxisol profile, even after six years of dairy cattle manure application at high rates, and that k applied via manure and minera
Esterco líquido de bovinos leiteiros combinado com aduba??o mineral sobre atributos químicos de um Latossolo Bruno
Silva, José Carlos Peixoto Modesto da;Motta, Ant?nio Carlos Vargas;Pauletti, Volnei;Favaretto, Nerilde;Barcellos, Milena;Oliveira, André Soares de;Veloso, Cristina Mattos;Silva, Luiz Fernando Costa e;
Revista Brasileira de Ciência do Solo , 2008, DOI: 10.1590/S0100-06832008000600033
Abstract: this study aimed to evaluate the influence of fertilization doses of liquid dairy manure combined with mineral fertilizer on the chemical properties of a brown oxisol, in no-tillage system and winter and summer crop rotation (sorghum/black-oat/corn/ryegrass/corn/ryegrass), for silage production, in the layers 0-5, 5-10, 10-30, 30-50 and 50-80 cm. the treatments were distributed in three randomized blocks, divided in 12 plots per block, in a 3 x 4 factorial arrangement, with three mineral fertilizer levels (0, 50 and 100 % of the dose recommended for the crops) and four organic fertilizer levels (0, 30, 60 and 90 m3 ha-1 year-1). the liquid dairy manure increased the ph linearly in the 0-5 cm layer and quadratic in the 30-50 cm layer. the mineral fertilization reduced the ph values linearly in the 0-5 and 5-10 cm layers, with quadratic effect at 50-80 cm. the potential acidity decreased in 5-10 cm, with quadratic pattern at 10-30 cm. the exchangeable ca2+ increased in the 0-5 cm layer with manure, but no effect of mineral fertilization on this attribute was verified. an increase in exchangeable mg2+ levels was observed in the manure treatments to a depth of 30 cm; under mineral fertilizer, increases were observed from 30 cm downwards. there was a linear increase of base saturation through manure doses, down to a depth of 10 cm, and the mineral fertilization decreased base saturation at 5-10 cm, with a quadratic effect at 50-80 cm.
Energy and protein nutritional requirements for Nellore bulls
Silva, Luiz Fernando Costa e;Valadares Filho, Sebasti?o de Campos;Zanetti, Diego;Rotta, Polyana Pizzi;Marcondes, Marcos Inácio;Prados, Laura Franco;Paulino, Mário Fonseca;Azevedo, Henrique de Oliveira;
Revista Brasileira de Zootecnia , 2012, DOI: 10.1590/S1516-35982012000600028
Abstract: the objective of this study was to determine the nutritional requirements of energy and protein and estimate the efficiencies of metabolizable energy utilization for fat and protein deposition, as well as for maintenance (km) and growth (kg). an experiment of comparative slaughter was carried out with thirty-seven 14-month-old (±1 month) nellore bulls with 259±24.9 kg. animals were divided as follows: five to reference, four to maintenance level and twenty-eight bulls feeding ad libitum. bulls were also grouped in 4 different feedlot periods (42, 84, 126 and 168 days) for slaughter. the diet was composed of corn silage and concentrate, at a 55:45 ratio. after the slaughter, the left half carcasses were totally dissected for determination of body composition. the energy requirements for maintenance were obtained by exponentially relating the heat production and the metabolizable energy intake, while the energy requirements for gain (neg) were obtained according to empty body weight (ebw) and ebw gain (ebg). the net protein requirements for gain (npg) were estimated according to ebg and retained energy (re). the net (nem) and metabolizable (mem) energy requirements for maintenance were 76.5 and 113.84 kcal/ebw0.75/day, respectively. the km was 0.67. the equations for neg and npg were: neg (mcal/day) = 0.0555 × ebw0.75 × ebg1.095 and npg (g/day) = 263.37 × ebg - 23.21 × re. the kg was 0.33. the efficiencies to deposition of energy as protein and fat were 0.18 and 0.71, respectively. the model obtained for the percentage of retained energy as protein (%rep) was %rep = 2.4221 × (re/ebg)-1.6472. the net and metabolizable energy requirements for maintenance of nellore bulls were 76.5 and 113.84 kcal/ebw0.75/day. the energy and protein requirements for gain could be obtained by the respective equations: neg (mcal/day) = 0.0555 × ebw0.75 × ebg1.095 and npg (g/day) = 263.37 × ebg - 23.21 × re.
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