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Search Results: 1 - 10 of 153551 matches for " Fábio Andrade;Bonomo "
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Produ o anual e qualidade de pastagem de Brachiaria decumbens diferida e estratégias de aduba o nitrogenada = Annual production and quality of Brachiaria decumbens pastures deferred and strategies nitrogen fertilization
Fábio Andrade Teixeira,Paulo Bonomo,Aureliano José Vieira Pires,Fabiano Ferreira da Silva
Acta Scientiarum : Animal Sciences , 2011,
Abstract: O objetivo deste trabalho foi avaliar a produ o de Brachiaria decumbens diferidos por períodos de 95 e 140 dias. Foram realizados dois ensaios experimentais (95 e 140 dias) e em cada ensaio foram estudadas quatro estratégias de aduba o no início e no final do ver o(0-0, 100-0, 50-50, 0-100 kg ha-1 de N), respectivamente, com quatro repeti es. A maior (p < 0,05) produ o anual de matéria seca (MS) foi verificada para a estratégia de aduba o com 100 kg ha-1 de N aplicados no início do ver o (100-0), nos pastos diferidos com 95 dias. Entretanto, no outono, inverno e primavera, a estratégia de aplica o de 100 kg ha-1 de N no final do ver o (0-100), proporcionou maiores (p < 0,05) produ es de forragem. A produ o diária de matéria seca, quando comparada ao ver o, sofreu redu es de 8, 89 e58% para as esta es outono, inverno e primavera, respectivamente, no ensaio de 95 dias de diferimento. Pode-se inferir que a estratégia de aplica o de 100 kg ha-1 no final do ver o é uma estratégia adequada para aumentar a produ o de matéria seca para os pastos avaliadosnos dois períodos de diferimento estudados, reduzindo a curva de sazonalidade da produ o anual de forragem. The aim of this work was to evaluate the production of Brachiaria decumbens deferred for periods of 95 and 140 days. Two experimental trials (95 and 140 days) were carried out and, in each one, four fertilization strategies were studied at the beginning and end of summer (0-0, 100-0, 50-50, 0-100 kg ha-1 of N), respectively, with four replications. The highest (p < 0.05) annual production of drymatter (DM) was verified for the fertilization strategy with 100 kg ha-1 of N applied in early summer (100-0), in pastures deferred for 95 days. However, in autumn, winter and spring, the application strategy of 100 kg ha-1 of N at end of summer (0-100) had greater (p < 0.05) forage production. Daily dry matter production, when compared to that of summer, was reduced by 8, 89 and 58% for autumn, winter and spring, respectively, in the 95-day deferring trial. It can be inferred that the strategy of application of 100 kg ha-1 in late summer is an appropriate strategy to increase dry matter production for grasses in the two studied deferral periods, reducing the curve of seasonal annual forage production.
Tiller population density in deferred Urochroa decumbens pasture and strategies for nitrogen fertilization
Teixeira, Fábio Andrade;Bonomo, Paulo;Pires, Aureliano José Vieira;Silva, Fabiano Ferreira;Abreu Filho, George;Viana, Pablo Teixeira;
Acta Scientiarum. Animal Sciences , 2013, DOI: 10.4025/actascianimsci.v35i1.10243
Abstract: the objective of this work was to evaluate the tiller population density in urochroa decumbens pasture deferred for 95 and 140 days, aiming to determine the best strategy for nitrogen fertilization. four fertilization strategies at the beginning and end of summer (0-0, 100-0, 50-50, 0-100 kg ha-1 of n) were studied, respectively, with four repetitions. for the pastures deferred for 95 days, the population densities of vegetative tillers were greater (p < 0.05) for the strategy 0-100. at the end of the deferment period, the weight of the vegetative tillers per hectare was greater for the strategy 0-100, followed by the strategy 50-50. the densities of vegetative tillers, evaluated in the pastures deferred for 140 days, were greater (p < 0.05) for the fertilization strategies 0-100 and divided 50-50. at the end of the deferment period, greater density (p < 0.05) of dead tillers was verified for the fertilization strategy 0-100, not proving effect (p < 0.05) in post-grazing. the strategy of application of 100 kg ha-1 at the end of summer, followed by the strategy of 50 kg ha-1 of nitrogen divided between the beginning and end of summer, promoted a positive influence on the tiller population density in pastures deferred for 140 days.
Exigências nutricionais de bezerros da ra?a Holandesa alimentados com concentrado e feno de capim-elefante
Nascimento, Paulo Valter Nunes;Silva, Fabiano Ferreira da;Veloso, Cristina Mattos;Bonomo, Paulo;Teixeira, Fábio Andrade;Gonsalves Neto, Jo?o;
Revista Brasileira de Zootecnia , 2009, DOI: 10.1590/S1516-35982009000800027
Abstract: thirteen male holstein calves with average age of 14 days were used. three animals were slaughtered at the beginning of the experiment (reference) and ten others were randomly distributed in two treatments (ground or pelleted feed), and slaughtered at 112 days of age to determine the nutritional requirements. regression equations of the logarithm of the amount of protein, fat and energy in the body were fitted as a function of the empty of body weight (ebw). the net protein and energy requirements for 1 kg gain of ebw were obtained by deriving the prediction equations of body composition. there were increases in protein, fat and energy contents with increase in body weight. the net protein and energy requirements for empty body weight gain (gebw) increased when ebw varied from 25.74 to 85.81 kg. the equation was obtained to estimate the retained protein as a function of the mean daily gain (dmg) and retained energy (re): rp = - 0.297083 + 4.19797 gain of fasting body weight (fgbw) + 0.0926327 re. the equation obtained to describe the relationship between retained energy (re), in mcal, and ebw daily gain (dgebw), in kg, for a determined ebw starting from the data of the present study was the following: re = 0.1004 × ebw0.75 × ebwg0.5552. the nem varied from 1.10 to 2.72 mcal/day and neg from 1.42 to 2.46 mcal/day when the body weight increased from 30 to 100 kg. from 28 to 112 days of age there were protein, fat and energy increases in the empty body composition of the holstein male calves.
Diferimento de pastos de Brachiaria decumbens adubados com nitrogênio no início e no final do período das águas
Teixeira, Fábio Andrade;Bonomo, Paulo;Pires, Aureliano José Vieira;Silva, Fabiano Ferreira;Rosa, Raul Castro Carriello;Nascimento, Paulo Valter Nunes;
Revista Brasileira de Zootecnia , 2011, DOI: 10.1590/S1516-35982011000700012
Abstract: the objective of this research was to evaluate the forage dry matter yield and its morphological components, height and pasture falling index, bulk density and forage nutritional value in brachiaria decumbens pastures deferred for 95 days under four strategies of nitrogen fertilization. it was studied four strategies of nitrogen application at the beginning and at the end of the rainy season, respectively (0-0, 100-0, 50-50, 0-100 kg n/ha) evaluated in three vertical strata at every 20 cm in a randomized block design in a split-plot arrangement with four replicates. pastures fertilized with 100 kg n at the end of the rainy season showed greater weights of total forage dry matter, leaf blade and green stem as well as height, extended height and total forage bulk density, leaf blade and green stem in all strata studied. falling indexes were greater for pastures fertilized at the end of the rainy season (0-100 and 50-50). the percentage of neutral detergent fiber were lower in stratum a (40 cm above ground), and contents of crude protein (cp) were greater in all strata for the treatments 0-100 and 50-50. although fertilization with 100 kg n at the end of the rainy season allows an increase in the mass of total forage and leaf blades and improvement in the quality of this forage, greater density of stems in the upper strata and the high falling index can characterize difficulties in forage selection and reduction in intake and animal performance.
Padr?es de deslocamento e permanência de bovinos em pastos de Brachiaria decumbens diferidos sob quatro estratégias de aduba??o
Teixeira, Fábio Andrade;Bonomo, Paulo;Pires, Aureliano José Vieira;Silva, Fabiano Ferreira da;Marques, Jair de Araújo;Santana Júnior, Hermógenes Almeida de;
Revista Brasileira de Zootecnia , 2011, DOI: 10.1590/S1516-35982011000700013
Abstract: this study was conducted to evaluate the displacement and permanency patterns of grazing cattle on brachiaria decumbens deferred during 95 days under four strategies of nitrogen application (0-0, 0-100, 50-50, 100-0 kg n.ha-1), at the beginning and at the end of the rainy season. during the deferred period, in the dry season, forage yield, canopy structural characteristics, and displacement pattern were evaluated. four steers were used in ten grazing tests of 45 minutes and 14 heifers girolanda, monitored every 10 minutes during 24 hours, were used to evaluate the permanency time. pastures fertilized with 100 kg n at the end of the rainy season had higher herbage and leaf blade, sward surface height, extended leaf height, sward leaf blade bulk density and stem mass in all canopy layers. the lodging rates were higher for pastures fertilized at the end of the rainy season (0-100 and 50-50). more feeding stations and steps per minute were found in 0-100 and 50-50 fertilization strategies, due to greater difficulty in forage selection with higher degree of lodging. on the other hand, the numbers of bites per feeding station and per minute were lower for these strategies. the permanency time was greater on pastures where the fertilization was 100 kg n.ha-1 at the end of the rainy season (0-100). fertilization close to sealing period modify the displacement pattern of animals because the higher plants lodging making the animals to spend more time on pasture with greater density of leaf blade.
Relation between Gamma Decomposition and Powder Formation of γ-U8Mo Nuclear Fuel Alloys via Hydrogen Embrittlement and Thermal Shock  [PDF]
Fábio Branco Vaz de Oliveira, Delvonei Alves de Andrade
World Journal of Nuclear Science and Technology (WJNST) , 2014, DOI: 10.4236/wjnst.2014.44023
Abstract: Gamma uranium-molybdenum alloys have been considered as the fuel phase in plate type fuel elements for material and test reactors (MTR), due to their acceptable performance under irradiation. Regarding their usage as a dispersion phase in aluminum matrix, it is necessary to convert the as cast structure into powder, and one of the techniques considered for this purpose is the hydration-dehydration (HDH). This paper shows that, under specific conditions of heating and cooling, γ-UMo fragmentation occurs in a non-reactive predominant mechanism, as shown by the curves of hydrogen absorption/desorption as a function of time and temperature. Our focus was on the experimental results presented by the addition of 8% weight molybdenum. Following the production by induction melting, samples of the alloys were thermally treated under a constant flow of hydrogen for temperatures varying from 500°C to 600°C and for times of 0.5 to 4 h. It was observed that, even without a massive hydration-dehydration process, the alloys fragmented under specific conditions of thermal treatment during the thermal shock phase of the experiments. Also, it was observed that there was a relation between absorption and the rate of gamma decomposition or the gamma phase stability of the alloy.
A moderna cafeicultura dos cerrados brasileiros
Fernandes, André Luís Teixeira;Partelli, Fábio Luiz;Bonomo, Robson;Golynski, Adelmo;
Pesquisa Agropecuária Tropical , 2012, DOI: 10.1590/S1983-40632012000200015
Abstract: the brazilian coffee planting presents a great importance in the creation of job opportunities, resources, and exchange value, being very diversified, with local particularities. the brazilian savannah covers more than 200 million ha, distributed along the states of minas gerais, goiás, mato grosso, mato grosso do sul, tocantins, bahia, piauí, maranh?o, and distrito federal, and has reached a yield of more than 5 million bags per year, mainly for coffea arabica l. the coffee growing, in that region, stands out for presenting yield above the national average and for using, in a more efficient way, agricultural inputs, irrigation, improved varieties, and mechanization, among other practices. the irrigated coffee crop, in brazil, covers 240,000 ha, most of these in the brazilian savannah, representing 10% of the total planted area and 25% of the total coffee yield. the most used irrigation systems are the sprinkler ones (conventional, net sprinkler, and center pivot) and the located ones (dripping and modified). its climate favours coffee quality, as it allows harvesting under low air humidity conditions, since rainfall is concentrated in the summer. it is also observed, in the brazilian savannah areas, higher insolation rates, mainly in the autumn and winter months, favorable to yield and quality. the most planted varieties are the catuaí and mundo novo ones, along with other promising drought and diseases resistant materials.
Tetramethrin Identified in Fat Adjacent to Mammary Carcinoma in a Male Dog—Case Report  [PDF]
Fernanda C. Figueiroa, Paulo Ricardo O. Bersano, Fábio Henrique E. Andrade, Noeme S. Rocha
Open Journal of Pathology (OJPathology) , 2012, DOI: 10.4236/ojpathology.2012.23019
Abstract: Canine mammary tumors (CMT) are very common in female dogs, representing approximately 50% of all tumors in this species, but are highly uncommon in male dogs and are primarily related to hyperestrogenism. There is considerable scientific interest in the possible role of environmental contaminants in the etiology of mammary tumors, specifically in relation to synthetic chemical substances released into the environment to which living beings are either directly or indirectly exposed. In this study, the presence of pyrethroid insecticide was observed in adipose tissue adjacent to canine mammary tumors. High Precision Liquid Chromatography—HPLC was adapted to detect and identify environmental contaminants in adipose tissue adjacent to malignant mammary tumor in one male dog, Akita, 12 years old. After surgery, the mass was carefully examined for malignant neoplastic lesions. Five grams of adipose tissue adjacent to the tumor was collected to detect environmental contaminants. The pyrethroid was identified as tetramethrin, at 0.20 μg/g. This is the first report in which the environmental contaminant level was detectable in adipose tissue of this male dog with a malignant mammary tumor, by HPLC. Results suggest the possible involvement of pyrethroid in the canine mammary tumor carcinogenesis since this animal did not present any other tumor that could cause hyperestrogenism.
CyazypyrTM Selectivity for Three Species of Phytoseiid for Coffee and Other Relevant Agricultural Crops in Brazil  [PDF]
Paulo Rebelles Reis, Melissa Alves Toledo, Fábio M. Andrade Silva
Agricultural Sciences (AS) , 2014, DOI: 10.4236/as.2014.54032
Abstract:

Mites belonging to the family Phytoseiidae are the most important and most widely studied among predatory mites of phytophagous mites. The phytophagous mites Brevipalpus phoenicis (Geijskes, 1939) (Tenuipalpidae) and Oligonychus ilicis (McGregor, 1917) (Tetranychidae) on coffee (Coffea spp.), are frequently found in combination with the predaceous mites Iphiseiodes zuluagai Denmark & Muma, 1972; Euseius alatus DeLeon, 1966 and Amblyseius herbicolus (Chant, 1959) (Acari: Phytoseiidae), among others. The purpose of this research was to study the effects of the product CyazypyrTM (cyantraniliprole 100 OD) on these three species of Phytoseiidae, relevant to coffee, citrus and other agricultural crops in Brazil, following standard laboratory procedures. Mated female mites were exposed to fresh-dried residues on a glass surface, with 8 treatments, 5 mites per glass plate and 6 replicates, in a completely randomized experimental design. Each test lasted eight days, with a daily count of the surviving females and of eggs laid. CyazypyrTM, in all tested doses (75, 100, 125, 150, 175 and 200 g a.i./ha), was selective for the studied species, A. herbicolus, I. zuluagai, and E. alatus. Overall the treatments resulted in low mortality rates and negligible impact on the reproduction. Therefore, based on IOBC standards, CyazypyrTMcan be classified as not harmful (class 1) or slightly harmful (class 2), comparable to the agrochemical TalentoTM (hexythiazox 500 WP-12 g a.i./ha) equivalent to a harmless standard of selectivity in the laboratory. CyazypyrTM is therefore a complement to programs of integrated pest management, to preserve the populations of predatory mites in crops of coffee and citrus, among others, in Brazil.

The Future Role of the Nuclear Energy in Brazil in a Transition Energy Scenario  [PDF]
Fábio Branco Vaz de Oliveira, Kengo Imakuma, Delvonei Alves de Andrade
Energy and Power Engineering (EPE) , 2014, DOI: 10.4236/epe.2014.613043
Abstract: This paper discusses and presents figures about the future power consumption in the world and, especially in Brazil, based on the current world and Brazilian’s energy scenarios. Emphasis is given to the scenarios of nuclear power and uranium resources demand. A discussion on the future roles of thorium and uranium fuels in the replacement of the traditional resources like oil and gas is also presented, as it is the role of the new nuclear power plants, planned to be built in a short term time horizon. This paper considers two different indexes for future projections, and the results obtained indicated a strong dependence on them. The time horizon for the analysis was fixed on the time estimated for Brazil to reach its maximum in population, and parameters evaluated were taken from the Brazilian’s governmental and world data on the population growth, energy consumption and energy consumption per capita. Calculations show that the power consumption projections for Brazil, for the adopted time horizon and working with global indexes, become overestimated, when compared with the results considering the national indexes. According to our approach, power consumption estimates using global indexes becomes approximately 4.5 times higher than the estimates presented by the Brazilian indexes. This was the motivation to the discussion between the Brazilian and world energy demand scenarios, and also the roles of nuclear energy in the future transition from the current conventional to alternative sources.
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