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Search Results: 1 - 10 of 378849 matches for " Leossávio C de;Oliveira "
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Aduba??o fosfatada em inhame em duas épocas de colheita
Oliveira, Arnaldo Nonato P de;Oliveira, Francisco A;Sousa, Leossávio C de;Oliveira, Ademar P de;Silva, Jandiê A da;Silva, Damiana F da;Silva, Natália V da;Santos, Rodolfo R;
Horticultura Brasileira , 2011, DOI: 10.1590/S0102-05362011000400002
Abstract: the low content of phosphorus in tropical soils makes essential the research about fertilization in crops which are poorly studied such as yam. thus, this study aimed to evaluate the yam productivity (cultivar da costa) depending on phosphorus doses and harvest seasons. from february to december 2009, an experiment was carried out using the randomized blocks experimental design in subdivided plots, with four replications. in the plots six doses of phosphorus were evaluated (0, 100, 200, 300, 400 and 500 kg ha-1 of p2o5), and in the subplots two harvest seasons (seven and nine months after planting). the highest weight of tubers in seven and nine months was 1.94 and 2.20 kg with 245 and 240 kg ha-1 of p2o5, respectively. there was no significant effect of phosphorus doses on the total productivity in seven months and the average value was 13 t ha-1. the highest marketable productivity was 11.8 t ha-1 with 266 kg ha-1 of p2o5. in nine months, the highest total and marketable yield (24.7 and 20.5 t ha-1, respectively) was achieved with the application of 285 and 226 kg ha-1 of p2o5, respectively. the yield of tubers classified as first was 80 and 90% in seven and nine months, respectively, and was obtained with the application of 320 and 277 kg ha-1 of p2o5, respectively. the economic doses were 219 and 233 kg ha-1 of p2o5 to obtain 20.19 t ha-1 and 12.88 t ha-1 of marketable tubers in seven and nine months, representing increments of 19.17 and 3.9 t ha-1 in comparison to no application of phosphorus, respectively.
Analytical Microscopy as a Tool in Sediments Study [Microscopia Analítica como Ferramenta no Estudo de Sedimentos]
Flávio C. Miguens,Martha L. de Oliveira,Rozane V. Marins,Luiz D. de Lacerda
Revista Virtual de Química , 2011,
Abstract: Historically, microscopes were used for descriptions of animals, plants and non-living specimens. In 19th century, the shape-function relationship marked microscopic studies. The later 20th century witnessed the nanometric special resolution provided by electron microscopes. As we enter the 21st century, the analytical electron microscopy promises to change our comprehension about the nano-world. Chemical analyses of the shape will redesign our understanding of the structure and functioning of animals, plants and non-living specimens, including sediments.
A phylogenetic analysis of Brycon and Henochilus (Characiformes, Characidae, Bryconinae) based on the mitochondrial gene 16S rRNA
Hilsdorf, Silva;Oliveira, Claudio;Lima, Flávio César Thadeo de;Matsumoto, Cristianne Kayoko;
Genetics and Molecular Biology , 2008, DOI: 10.1590/S1415-47572008000200034
Abstract: the genus brycon, the largest subunit of the bryconinae, has 42 valid species distributed from southern mexico to the la plata river in argentina. henochilus is a monotypic genus, comprising a single species (h. wheatlandii) found in the upper rio doce basin. in the present study, partial sequences of the mitochondrial gene 16s were obtained for fifteen species of brycon and for henochilus wheatlandii. the results showed that the genus brycon is paraphyletic, since henochilus is the sister-group of b. ferox and b. insignis. the most basal species analyzed were the trans-andean species b. henni, b. petrosus, and b. chagrensis.
Mixing Theory of Retroviruses and Genetic Algorithm to Build a New Nature-Inspired Meta-Heuristic for Real-Parameter Function Optimization Problems
Moreira, Renato Sim?es;Teixeira, Otávio Noura;Oliveira, Roberto Célio Lim?o de;
Polibits , 2010,
Abstract: this paper describes the development of a new hybrid meta-heuristic of optimization based on a viral lifecycle, specifically the retroviruses (the nature's swiftest evolvers), called retroviral iterative genetic algorithm (riga). this algorithm uses genetics algorithms (ga) structures with features of retroviral replication, providing a great genetic diversity, confirmed by better results achieved by riga comparing with ga applied to some real-valued benchmarking functions.
PAR METROS MORFOMéTRICOS DO ALTO CURSO DA BACIA RIO MACAé (RJ): SUBSíDIOS AO ENTENDIMENTO DA DIN MICA GEOMORFOLóGICA
Suelen Oliveira Alpino,Fernanda C. de Souza Pereira,Otávio Migues da Rocha Le?o
Revista Tamoios , 2007,
Abstract: O conhecimento das características geomorfológica de uma determinada bacia hidrográfica é de fundamental importancia para uma gest o eficaz de seus recursos naturais e para o entendimento de suas potencialidades e limita es quanto ao seu uso e ocupa o. O estudo dos parametros morfométricos surge, portanto, como subsídio ao conhecimento da rela o entre o relevo e a dinamica hídrica da bacia. Partindo desses pressupostos, este trabalho tem como objetivo caracterizar o relevo do alto curso da bacia do rio Macaé, localizado no município de Nova Friburgo (RJ), por meio da identifica o de classes de três parametros morfométricos: desnivelamento altimétrico, gradiente da bacia e densidade de drenagem. Para tanto, foi utilizada a metodologia proposta por Meis et al. (1982) de desnivelamento altimétrico, além das metodologias de gradiente da bacia e de densidade de drenagem propostas por Christofoletti (1980). Os resultados apontam para uma área de desnivelamento altimétrico elevado, chegando até 996m em uma determinada sub-bacia, e, aproximadamente, 59,05% das sub-bacias possuem desnivelamento maior que 400m. Cerca de 73,23% possuem gradiente maior que 0,2; e 59,05% possuem uma densidade de drenagem maior que 2,0 km/km2. Esses dados ir o auxiliar na compreens o dos processos hidrosedimentológicos que ocorrem na área que abrange cada sub-bacia. Palavras-chave: Bacia hidrográfica, compartimenta o topográfica e Geomorfologia.
Respiratory heat loss in Morada Nova sheep in Brazilian semi-arid regions
Steffan Edward Octávio Oliveira,Cíntia Carol de Melo Costa
Journal of Animal Behaviour and Biometeorology , 2013, DOI: 10.14269/2318-1265.v01n01a04
Abstract: This study aimed to evaluate the respiratory heat loss in sheep from the equations developed for this species and its relations with meteorological variables in semi-arid regions. The respiratory heat loss (sensible and latent) was estimated through the equations in the literature for four 12-month-old male Morada Nova sheep, kept in an installation with shading of ceramic tiles and a 3-meter-high ceiling. The following environmental variables were measured: air temperature (TA), wind speed (U), relative humidity (RH) and partial vapor pressure (PP{tA}). The physiological variables measured: rectal temperature (TR) and respiratory rate (RR). Statistical analysis was performed based on regression using PROC REG procedure in SAS. The latent respiratory heat loss showed a linear and positive correlation with ambient temperature. However, the respiratory convection showed a linear and negative correlation, but with incipient values. Therefore, the latent heat loss is more important than the sensible one in the respiratory system to maintain thermoregulation of sheep in a semi-arid region of Brazil.
Caracteriza??o da poligalacturonase produzida por fermenta??o semi-sólida utilizando-se resíduo do maracujá como substrato
Souza, Rosane L. A. de;Oliveira, Líbia de S. C.;Silva, Flávio L. H. da;Amorim, Beatriz C.;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2010, DOI: 10.1590/S1415-43662010000900011
Abstract: pectinolytic enzymes, or pectinases, are a heterogeneous group of enzymes that hydrolyze the pectic substances present in plant cells. these enzymes are applied in several areas, making it important to know their characteristics for an efficient application. this work aimed to characterize the dry residue of passion fruit (passiflora edulis) and subsequent characterization of the enzyme polygalacturonase produced by solid state fermentation and leavening agent and the filamentous fungus aspergillus niger. the residue of passion fruit presented a pectin content of 13.10%, having a potential as a substrate for the production of pectinases. the activity of polygalacturonase reached a maximum value after 66 h of process with 40% initial moisture content and 1% of nitrogen supplementation. in this condition an activity of 20.9 u g-1 was obtained. the polygalacturonase produced the crude enzymatic extract presenting good thermal stability up to temperatures of 50 °c. this enzyme remained stable in the ph range between 3.5 and 5.5 and was not detected for ph values above 6.5.
Bovinos mesti?os alimentados com diferentes propor??es de volumoso:concentrado. 2. Efeito sobre a ingest?o de nutrientes
Resende, Flávio Dutra de;Queiroz, Augusto César de;Oliveira, José Victor de;Pereira, José Carlos;Mancio, Antonio Bento;
Revista Brasileira de Zootecnia , 2001, DOI: 10.1590/S1516-35982001000100038
Abstract: the objective of this work was to evaluate the effects of the forage to concentrate ratio in the nutrient intake by 25 crossbred steers with initial 310 kg lw. five full fed diets based on tanzaniagrass hay and concentrate, with different forage to concentrate ratio (85:15, 70:30, 55:45; 40:60; and 25:75) were used. a quadratic effect was observed for the concentrate level in the diet on the intake of dry matter (dm), organic matter (om), crude protein (cp) and, gross energy (ge), with a maximum intake for dm, 2.87% pv; om, 118 g/w0,75 e 2.7% pv; cp, 1.52 kg/day; 18.2 g/w0,75; and 0.42% pv e ge, 536 kcal/ w0,75, for the levels of 39; 44, 42; 43; 39, e 38 e 46% of concentrate, respectively. a quadratic effect was observed for the digestible dry matter (ddm), digestible organic matter (dom), digestible protein (dp) and digestible energy (ed), with a maximum intake for ddm of 7.07; 83.8; and 1.91; dom, 6.91; 81.4, and 1.86; and dp, 1.13; 13.4; e 0.31, in kg/day, g/w0,75 and %lw, respectively, for the levels of 52, 49, 48, 54, 51, 50, 41, 28 e 37% of concentrate. for de, the maximum intake were 30.6 mcal/day and 356 kcal/ w0,75 , for the levels of 62.0 and 57.0% of concentrate, respectively. the maximization of the digestible nutrient intake for the maximum efficiency of nutrient utilization occurred with the intake of ndf ranged from 1.25 to 1.02% lw for crossbred steers
Bovinos mesti?os alimentados com diferentes propor??es de volumoso:concentrado. 1. Digestibilidade aparente dos nutrientes, ganho de peso e convers?o alimentar
Resende, Flávio Dutra de;Queiroz, Augusto César de;Oliveira, José Victor de;Pereira, José Carlos;Mancio, Antonio Bento;
Revista Brasileira de Zootecnia , 2001, DOI: 10.1590/S1516-35982001000100037
Abstract: the objective of this work was to evaluate the effects of the forage to concentrate ratio on the weight gain and feed: gain, and to determine the apparent digestibility of the nutrients of 25 and 20 crossbred steers averaging 310 kg lw, respectively. five full fed diets based on tanzaniagrass hay and concentrate, with different forage to concentrate ratio (85:15, 70:30, 55:45; 40:60; and 25:75) were used. the regression analysis of the coefficienties of apparent digestible dry matter, digestible organic matter, neutral detergent fiber, digestible protein and gross energy in function of the concentrate level in the diets presented quadratic effect and the maximum estimated coefficienties were 67.0, 70.0, 51.0 42.0 74.0 and 69.0 %, for the levels of 54, 58, 28, 12, 34 e 77 % of concentrate in the diets, respectively. the average daily gain (adg) linearly increased with the increase of the concentrate level in the diets. there was an increase of 0.00895 kg/day in the adg for each percent increase on the concentrate level in the diets, from 15.0 to 75.0 %. in the same range, the feed: gain of dm, cp, and ge increased 0.08; 0.011468; and 0,50646, respectively, for each percent increase on the concentrate level in the diets. the maximum nutrient digestion for the maximum efficiency of nutrient utilization occurred with the intake of neutral detergent fiber ranged from 1.25 to 1.02% lw for crossbred steers
Bovinos mesti os alimentados com diferentes propor es de volumoso:concentrado. 1. Digestibilidade aparente dos nutrientes, ganho de peso e convers o alimentar
Resende Flávio Dutra de,Queiroz Augusto César de,Oliveira José Victor de,Pereira José Carlos
Revista Brasileira de Zootecnia , 2001,
Abstract: Os objetivos deste trabalho foram avaliar os efeitos da rela o volumoso: concentrado sobre ganho de peso e convers o alimentar e determinar a digestibilidade aparente dos nutrientes de 25 e 20 novilhos mesti os, com 310 kg PV médio inicial, respectivamente. Cinco dietas foram fornecidas à vontade, à base de feno de capim-tanzania e concentrado, em diferentes propor es de volumoso:concentrado (85:15; 70:30; 55:45; 40:60; e 25:75). A análise de regress o dos coeficientes de digestibilidade aparente da matéria seca, matéria organica, fibra em detergente neutro, proteína bruta e energia bruta, em fun o do nível de concentrado na dieta, apresentou efeito quadrático e os coeficientes máximos estimados foram de 67, 70, 51, 42, 74 e 69%, para os níveis de 54, 58, 28, 12, 34 e 77,0% de concentrado na dieta, respectivamente. O ganho médio diário de PV (GMD) elevou-se linearmente com o aumento do nível de concentrado na dieta. Observaram-se incrementos de 0,00895 kg/dia no GMD para cada aumento percentual do nível de concentrado na dieta, entre 15 e 75%. Nesta mesma faixa, a convers o alimentar da MS, PB e EB melhorou 0,08; 0,011468; e 0,50646, respectivamente, para cada aumento percentual do nível de concentrado na dieta. A máxima digest o dos nutrientes para a máxima eficiência de utiliza o ocorreu com níveis de ingest o de FDN variando de 1,25 a 1,02% PV para novilhos mesti os.
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