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Search Results: 1 - 10 of 292628 matches for " Carlos Alberto da Silva e Cunha "
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Helena Maria Santos de Oliveira,Cláudia Maria Ferreira Pereira Lopes,Carlos Alberto da Silva e Cunha
Revista Universo Contábil , 2008,
Abstract: Neste trabalho, efectuamos uma revis o de literatura sobre a relevancia da transparência da informa o financeira por parte dos emitentes de valores mobiliários admitidos à negocia o em mercados regulamentados que se situem nos Estados membros da Uni o Europeia. Desta resulta consensual que a transparência nas demonstra es financeiras (DF) é uma quest o cada vez mais fundamental dada a forte internacionaliza o das empresas e globaliza o dos mercados, afectando o fluxo de capitais e o próprio desenvolvimento dos mercados financeiros. A Directiva 2004/109/CE do Parlamento Europeu e do Conselho, de 15 de dezembro de 2004, reflecte a preocupa o dos Estados membros em harmonizar os requisitos e critérios de transparência, particularmente no seguimento da Directiva 2003/34/CE, sobre os Prospectos, no que se refere às informa es respeitantes aos emitentes de valores mobiliários. Esta quest o da transparência foi também muito impulsionada pela promulga o da Sarbanes-Oxley Act. In this work, we review some of the literature that deals with the relevance of the transparency of financial information disclosed by firms whose stock is traded on regulated financial markets located in the European Union. From this review it is agreed that the transparency of financial reports is becoming an increasingly important question since the internationalization of firms and globalization of markets are becoming stronger. These situations affect capital flow and the development of financial markets. Directive 2004/109/CE of the European Parliament and Council, issue on 15th December 2004, shows the preoccupation of European Members about the use the of criteria for transparency, namely in following the 2003/34/CE Directive, related with the Prospectus, in the case of firms that have issued stock. The importance of transparency also increases with the Sarbanes-Oxley Act.
Study of warm ischemia followed by reperfusion on a lower limb model in rats: effect of allopurinol and streptokinase
Cunha, Marcelo Sacramento;Silva, Jose Carlos Faes da;Nakamoto, Hugo Alberto;Ferreira, Marcus Castro;
Clinics , 2005, DOI: 10.1590/S1807-59322005000300006
Abstract: prolonged tissue ischemia leads to changes in microcirculation and production of oxygen free radicals. the event eventually responsible for tissue death is the no-reflow phenomenon and its management is a challenge for the surgeon dealing with replantation or transplantation. we introduce a model of warm ischemia and reperfusion of the lower limb of rats with which we studied the effect of allopurinol and streptokinase. method: section of the lower limb with preservation of vessels and nerves was performed in 110 rats. femoral vessels clamped for periods of 0, 2, 4, 6, and 8 hours of ischemia were allowed to reperfuse (groups m0, m2, m4, m6, and m8 respectively). other groups, e1, e2, and e3, received streptokinase, allopurinol, or a combination of the two drugs after 6 hours of ischemia. results: viability rates of the ischemic limbs after 7 days were 100% (m0), 80% (m2), 63.6% (m4), 50% (m6), and 20% (m8). in the experimental groups, e1, e2, and e3, viability rates were 67% (e1), 70% (e2), and 70% (e3). groups m0, m2, m4, m6, and m8 differed among themselves except for groups m4 and m6. group e1 had a higher rate of limb viability than m6 (control group) but not than m4. groups e1, e2 and e3 had higher rates of limb viability than m6 but not than m2 or m4. discussion: the results suggest that increased viability of limbs after 6 hours of ischemia occurs when allopurinol or streptokinase is used. the combination of the two drugs does not appear to produce any additional effect.
Coeficientes médios da equa??o de Angstr?m-Prescott, radia??o solar e evapotranspira??o de referência em Brasília
Dornelas, Karla Daniele e Silva;Silva, Cícero Lopes da;Oliveira, Carlos Alberto da Silva;
Pesquisa Agropecuária Brasileira , 2006, DOI: 10.1590/S0100-204X2006000800001
Abstract: the objective of this work was to estimate angstr?m-prescott equation mean coefficients in brasília, df, brazil, and their effects on the calculations of global radiation (rs) and reference crop evapotranspiration (eto). it was used meteorological data from embrapa hortali?as weather station, from 1978 to 2003. the mean coefficients were determined by linear regression analysis considering monthly, annual and total periods. using the calculated coefficients for different periods and those provided by fao (0.25 and 0.50), rs and eto were estimated and their performances were evaluated. monthly mean coefficient a varied from 0.241 to 0.345, and b from 0.430 to 0.515. annual mean coefficients a and b were 0.278 and 0.498, and total means were 0.282 and 0.490, respectively. these coefficients did not differ from each other on radiation estimates. the month of july provided the worse estimates and performance. when using calculated rs estimates with monthly, annual, total and fao coefficients, estimated values of eto did not differ from observed ones, providing excellent performance, despite the mean coefficient used. depending on the final application, it is suggested the use of total mean coefficients due to their easiness to estimate the shortwave radiation.
Distribui??o das raízes dos citros em fun??o da profundidade da cova de plantio em Latossolo Amarelo dos Tabuleiros Costeiros
Souza, Laercio Duarte;Ribeiro, Luciano da Silva;Souza, Luciano da Silva;Ledo, Carlos Alberto da Silva;Cunha Sobrinho, Almir Pinto da;
Revista Brasileira de Fruticultura , 2006, DOI: 10.1590/S0100-29452006000100025
Abstract: citros crop in northeast brazil is concentrated on states of bahia and sergipe, with 106,385 hectares, established in the coastal tablelands agricultural ecosystem, where yellow latosol prevail, with cohesive horizons that become hard when dry. this problem retains the roots development along the soil profile, decreasing the soil volume explored and consequently the availability of water and nutrients. to solve this problem, breaking the cohesive layer and increasing the volume of roots in the soil, orange tree 'valência' grafted on lemon tree 'volkameriano' was planted in several hole depths (0.40; 0.60; 0.80; 1.00 and 1.20 m). the distribution of roots, evaluated in four different diameters, showed differences among the treatments. the best depths were 0.80 m, 1.00 m and 1.20 m.
Avalia??o de plantas cítricas, em diferentes profundidades de plantio, em latossolo amarelo dos tabuleiros costeiros
Souza, Laercio Duarte;Cunha Sobrinho, Almir Pinto da;Ribeiro, Luciano da Silva;Souza, Luciano da Silva;Ledo, Carlos Alberto da Silva;
Revista Brasileira de Fruticultura , 2004, DOI: 10.1590/S0100-29452004000200015
Abstract: the citros crop in bahia and sergipe, represents about 103.000 hectares and is established in the coastal table land, where yellow latosol prevail, with cohesive horizons that become hardned when dry. this problem restrains the development of the roots along the profile of the soil, promoting the decrease of soil volume explored and consequently the availability of water and nutrients. to solve this problem, breaking the cohesive layer and increase the volume of soil roots it was used several depths of planting with holes of 0,40; 0,60; 0,80; 1,00 and 1,20 m, using orange tree 'valência' grafted on lemon tree 'volkameriano'. the best development of the roots was obtained with the 1,00 m and 1,20 m of depth. no significant statistical results was obtained for diameter of the cup and the stem, plant height and production of fruits among the treatments.
Divergência genética entre cinco cultivares de mamoneira
Bahia, Henrique Fortes;Silva, Simone Alves;Fernandez, Luzimar Gonzaga;Ledo, Carlos Alberto da Silva;Moreira, Ricardo Franco Cunha;
Pesquisa Agropecuária Brasileira , 2008, DOI: 10.1590/S0100-204X2008000300010
Abstract: the objective of this work was to evaluate the genetic divergence between castor bean (ricinus communis l.) cultivars, from adaptative traits, yield components and cultivars productivity. the experiment in a randomized blocks design with five treatments and five replications was carried out in a xanthic hapludox in cruz das almas, ba, brazil. data were submitted to the variance analysis and the average values had been commanded according to scott-knott test (a = 0.05). based on multivariate analysis, the genetic divergence was determined using cluster analysis and principal components analysis. tree groups were formed, and the one which comprised the cultivate more divergent, mirante 10, is not recommended for hybridization due to its low performance. promising combinations are those ones found between sipeal 28 x brs 188 paragua?u, sipeal 28 x brs 149 nordestina, ebda mpa 17 x brs 188 paragua?u and ebda mpa 17 x brs 149 nordestina, due to the dissimilarity and the best average performance of these genotypes.
Estreptoquinase e oxigênio hiperbárico em congest?o após reimplante de membro
Cunha, Marcelo Sacramento;Silva, José Carlos Faes da;Nakamoto, Hugo Alberto;Fels, Klaus Werner;Ferreira, Marcus Castro;
Revista da Associa??o Médica Brasileira , 2007, DOI: 10.1590/S0104-42302007000100015
Abstract: objective: the effectiveness of streptokinase and hyperbaric oxygen therapy on venous occlusion after limb reimplantation was tested in rats. methods: amputation with preservation of vessels and nerves of the right hind limb was carried out in 140 rats. groups mg0, mg1, mg2, mg3 and mg4 were submitted to 0, 1, 2, 3 and 4 hours of venous occlusion. mg3 was elected as control for the experimental groups. groups eg1 and eg2 were submitted to 3 hours of venous occlusion and were treated with streptokinase and hyperbaric oxygen therapy. limbs were observed for 7 days and their mortality and survival rates were studied. results: trans-operatory mortality rates in groups mg0, mg1, mg2, mg3 and mg4 were 0, 10, 15, 30 and 60% respectively and the postoperatory mortality rates were 5; 11.1; 11.7; 14.2 and 100% respectively. the limb survival rates were 100%, 87.5%, 80% and 66.67% respectively and 76.9% and 100% in eg1 and eg2. model groups were statistically different, except for mg1 and mg2 in trans-operatory mortality rates. there were no statistical differences in postoperatory mortality rates between model groups except for mg3 and mg4. model groups were statistically different, with the exception of mg1 and mg2, in limb survival rates. eg1 and mg3 showed no statistical difference in limb survival and eg2 had a better limb survival than mg3. conclusion: results suggest that the administration of streptokinase does not change effects of venous occlusion and that hyperbaric oxygen therapy may decrease the effects of venous occlusion in limbs.
Produtividade da bananeira ´Prata-An?´ e ´Grande Naine´ no terceiro ciclo sob irriga??o por microaspers?o em tabuleiros costeiros da Bahia
Coelho, Eugenio Ferreira;Ledo, Carlos Alberto da Silva;Silva, Sebasti?o de Oliveira e;
Revista Brasileira de Fruticultura , 2006, DOI: 10.1590/S0100-29452006000300021
Abstract: the work had as objective to define the most adequate irrigation system to banana crop in the third cycle under bahia coast tableland conditions. the experiment followed a random block design with four replications and 10 treatments, in a 5 x 2 factorial scheme with five levels of water depths and two banana cultivars: "prata an?" (prata group) and "grande naine" (cavendish group). the treatments or irrigation systems were defined from five fractions of the crop evapotranspiration, defined by the product of potential evapotranspiration and the recommended crop coefficients. the grande naine cultivar was harvested 45 days earlier than the prata ana, under irrigation. the irrigation depth of 415 mm was considered the most adequate to be applied to the grande naine cv., while the water depth of 554 mm was the most adequate for the 'prata an?'. the crop coefficients had limits from 0.44 to 0.89 and 0.58 to 1.18 for grande naine and prata an? cultivars respectively.
Studies of micronuclei and other nuclear abnormalities in red blood cells of Colossoma macropomum exposed to methylmercury
Rocha, Carlos Alberto Machado da;Cunha, Lorena Araújo da;Pinheiro, Raul Henrique da Silva;Bahia, Marcelo de Oliveira;Burbano, Rommel Mario Rodríguez;
Genetics and Molecular Biology , 2011, DOI: 10.1590/S1415-47572011000400024
Abstract: the frequencies of micronuclei (mn) and morphological nuclear abnormalities (na) in erythrocytes in the peripheral blood of tambaqui (colossoma macropomum), treated with 2 mg.l-1 methylmercury (mehg), were analyzed. two groups (nine specimens in each) were exposed to mehg for different periods (group a - 24 h; group b - 120 h). a third group served as negative control (group c, untreated; n = 9). although, when compared to the control group there were no significant differences in mn frequency in the treated groups, for na, the differences between the frequencies of group b (treated for 120 h) and the control group were extremely significant (p < 0.02), thus demonstrating the potentially adverse effects of mehg on c. macropomum erythrocytes after prolonged exposure.
Efeito de rodas compactadoras submetidas a cargas verticais em profundidades de semeadura sobre o desenvolvimento do milho
Silva, Rouverson P. da;Corá, José E.;Carvalho Filho, Alberto;Lopes, Afonso;Furlani, Carlos E. A.;
Engenharia Agrícola , 2004, DOI: 10.1590/S0100-69162004000200019
Abstract: the success of the establishment of a crop depend on several factors and the seeders press wheels should be capable to improve the contact soil-seed in order to promote good seed germination. the present work had as objective to study the influence of three models of press wheel, three depths of sowing and three load levels on the press wheel on the germination and development of the corn grow, in a projected sowing assay lane for this purpose. the experiment was carried out at municipal district of uberaba - mg, brazil, in a split plot array, with 27 treatments and four replications, used to evaluate agronomic characteristics of the corn crop. the results evidenced that the depth of sowing was the factor that more affected the vegetative development of the corn crop in the stadium 2, and none of the evaluated characteristics in the stadium 4 had significant differences in the measures of the corn development.
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