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Search Results: 1 - 10 of 7301 matches for " Iderval;Freitas "
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Produtividade e composi??o química de gramíneas tropicais na Zona da Mata de Pernambuco
Santos, Mércia Virginia Ferreira dos;Dubeux Júnior, José Carlos Batista;Silva, Maria da Concei??o;Santos, Stuart Francisco dos;Ferreira, Rinaldo Luiz Caraciolo;Mello, Alexandre Carneiro Le?o de;Farias, Iderval;Freitas, Erinaldo Viana de;
Revista Brasileira de Zootecnia , 2003, DOI: 10.1590/S1516-35982003000400006
Abstract: this work was carried out to evaluate the productive potencial and chemical composition of five grasses (pennisetum purpureum schum. cv. pioneiro, p. purpureum schum cv. mott; panicum maximum jacq. cv. momba?a, p. maximum jacq cv. tanzania, e brachiaria brizantha (hochst) stapf. cv. marandu). the cuts were performed at 35 days of intervals and 40 cm above ground. pioneiro showed higher dm yield (7.35 t dm/ha/35 days) when compared to the dwarf elephantgrass (5.28 t dm/ha/35 days) and tanzania grass (5.23 t dm/ha/35 days), being similar to the others. brachiaria brizantha presented the highest total tillering (538.72/m2) however the aerial tiller weight was the lowest for this species. the cultivars of p. purpureum showed higher aerial tillering and lower basal tillering, when compared to the cultivars of p. maximum. the cp concentration ranged from 6.96 to 10.20% and the cultivar pioneiro presented the highest value. no difference was found among the forages for ndf and adf, and the mean values were 73.83 and 39.20%, respectively. at the evaluated cut interval, the forages presented a high proportion of leaves (> 80%), showing potential to be used on livestock pasture-based operations in the forest zone of pernambuco.
Positive and Purifying Selection Influence the Evolution of Doublesex in the Anastrepha fraterculus Species Group
Iderval S. Sobrinho, Reinaldo A. de Brito
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0033446
Abstract: The gene doublesex (dsx) is considered to be under strong selective constraint along its evolutionary history because of its central role in somatic sex differentiation in insects. However, previous studies of dsx used global estimates of evolutionary rates to investigate its molecular evolution, which potentially miss signals of adaptive changes in generally conserved genes. In this work, we investigated the molecular evolution of dsx in the Anastrepha fraterculus species group (Diptera, Tephritidae), and test the hypothesis that this gene evolved solely by purifying selection using divergence-based and population-based methods. In the first approach, we compared sequences from Anastrepha and other Tephritidae with other Muscomorpha species, analyzed variation in nonsynonymous to synonymous rate ratios (dN/dS) in the Tephritidae, and investigated radical and conservative changes in amino acid physicochemical properties. We show a general selective constraint on dsx, but with signs of positive selection mainly in the common region. Such changes were localized in alpha-helices previously reported to be involved in dimer formation in the OD2 domain and near the C-terminal of the OD1 domain. In the population-based approach, we amplified a region of 540 bp that spanned almost all of the region common to both sexes from 32 different sites in Brazil. We investigated patterns of selection using neutrality tests based on the frequency spectrum and locations of synonymous and nonsynonymous mutations in a haplotype network. As in the divergence-based approach, these analyses showed that dsx has evolved under an overall selective constraint, but with some events of positive selection. In contrast to previous studies, our analyses indicate that even though dsx has indeed evolved as a conserved gene, the common region of dsx has also experienced bouts of positive selection, perhaps driven by sexual selection, during its evolution.
Evidence for positive selection in the gene fruitless in Anastrepha fruit flies
Iderval S Sobrinho, Reinaldo A de Brito
BMC Evolutionary Biology , 2010, DOI: 10.1186/1471-2148-10-293
Abstract: Here we test whether the fruitless gene has evolved neutrally or under positive selection in species of Anastrepha (Tephritidae: Diptera) using two different approaches, a long-term evolutionary analysis and a populational genetic data analysis. The first analysis was performed by using sequences of three species of Anastrepha and sequences from several species of Drosophila using the ratio of nonsynonymous to synonymous rates of evolution in PAML, which revealed that the fru region here studied has evolved by positive selection. Using Bayes Empirical Bayes we estimated that 16 sites located in the connecting region of the fruitless gene were evolving under positive selection. We also investigated for signs of this positive selection using populational data from 50 specimens from three species of Anastrepha from different localities in Brazil. The use of standard tests of selection and a new test that compares patterns of differential survival between synonymous and nonsynonymous in evolutionary time also provide evidence of positive selection across species and of a selective sweep for one of the species investigated.Our data indicate that the high diversification of fru connecting region in Anastrepha flies is due at least in part to positive selection, not merely as a consequence of relaxed selective constraint. These conclusions are based not only on the comparison of distantly related taxa that show long-term divergence time, but also on recently diverged lineages and suggest that episodes of adaptive evolution in fru may be related to sexual selection and/or conflict related to its involvement in male courtship behavior.Several genes related to reproduction have shown higher rates of divergence than other genes in the genome [1,2]. This fast differentiation has been explained most often by positive selection mediated by sexual selection and/or sexual conflict [1,3,4], though some have suggested relaxed selective constraints [5,6]. Because these genes show high
Desempenho produtivo de vacas 5/8 Holando/Zebu alimentadas com diferentes cultivares de palma forrageira (Opuntia e Nopalea)
Santos Djalma Cordeiro dos,Santos Mércia Virginia Ferrreira dos,Farias Iderval,Dias Flávio Marcos
Revista Brasileira de Zootecnia , 2001,
Abstract: Foi estudado o efeito de diferentes cultivares de palma forrageira sobre o desempenho produtivo de vacas mesti as holando/zebu. O delineamento experimental foi de ensaios alternativos, obedecendo a distribui o de quadrado latino, contendo três quadrados, com três períodos de 28 dias cada. Os tratamentos foram constituídos pelas cultivares de palma forrageira redonda, gigante e miúda. De modo geral, foram observadas pequenas varia es na composi o química dos cultivares de palma. N o foi observada diferen a significativa quanto ao consumo de palma in natura, consumo de restolho de milho e consumo de matéria seca, entre os animais alimentados com as diferentes cultivares de palma, sendo de 54,21; 7,91; e 9,04 kg/dia, respectivamente. Também n o foi observada diferen a para as variáveis leite produzido, leite a 4% de gordura e rela o de consumo de matéria seca para leite produzido. Os dados sugerem que vacas leiteiras mesti as podem ser alimentadas com diferentes cultivares de palma forrageira, sem comprometimento do desempenho produtivo das mesmas.
Manejo de colheita e espa amento da palma-forrageira, em consórcio com sorgo granífero, no Agreste de Pernambuco
Pesquisa Agropecuária Brasileira , 2000,
Abstract: Este trabalho foi realizado na zona semi-árida de Pernambuco e teve como objetivo investigar o efeito de espa amento, e a freqüência e intensidade de colheitas da palma-forrageira (Opuntia ficus-indica Mill.) consorciada com sorgo granífero (Sorghum bicolor (L.) Moench). O delineamento experimental foi o de blocos ao acaso em parcelas subdivididas, sendo os espa amentos alocados nas parcelas principais, e as freqüências e intensidades de colheitas, nas subparcelas. Os resultados s o de um período de 12 anos, e as produ es de matéria seca de palma, de gr os e restolhos de sorgo foram: 5,23, 1,65 e 2,07; 4,51, 1,30 e 2,10; 2,75, 1,97 e 3,51 t/ha/ano, em espa amentos de 2,0 m x 1,0 m; 3,0 m x 1,0 m x 0,50 m e 7,0 m x 1,0 m x 0,50 m, respectivamente. A produ o de matéria seca foi diferente entre as freqüências de corte, quando foram conservados os artículos primários: 4,08 t/ha/ano na freqüência de quatro anos, e de 3,43 t/ha/ano na freqüência de dois anos. A produ o de palma aumentou com o período de crescimento da planta, nas duas intensidades de corte estudadas. A composi o química dos artículos de palma e dos restolhos de sorgo foi pouco afetada pelos tratamentos.
Evaluation of feeding supply and forage cactus processing for lactation cows
Vilela, Márcio da Silva;Ferreira, Marcelo de Andrade;Azevedo, Marcílio de;Farias, Iderval;Torres, Luiz Carlos Leal;Guimar?es, Amanda Vasconcelos;
Revista Brasileira de Zootecnia , 2010, DOI: 10.1590/S1516-35982010001200027
Abstract: the aim of this study was to evaluate the effect of the manner in which diet is supplied and spineless cactus forage is processed on intake, nutrient digestibility, milk production and composition, concentration of plasma urea nitrogen (pun) in the milk urea nitrogen (mun) and production of microbial protein in holstein cows in lactation. eight cows (453 ± 75.8 kg) yielding 14 kg milk/day were allotted to a factorial design, with two manners of cactus processing (knife-chopped or forage machine) and two diet supplies (separate concentrate or total mixed ration). intakes of dry matter, organic matter, neutral detergent fiber and total digestible nutrients were lower when cactus was knife-chopped. digestibility, milk production and fat and protein yield did not change according to the manner diet was supplied neither by forage cactus processing. average milk production was 14.8 kg/day for knife-chopped cactus and 14.6 kg/day for cactus chopped in forage machine and 14.8 kg/day when cactus was given in separate concentrate and 14.5 kg/day when it was given in total mixed ration. however, fat content was lower (36 g/kg) for knife-chopped cactus fed cows. purine derivatives and concentrations of n-ureic were not influenced by the manner in which diet was supplied neither by the forage cactus processing. means observed for efficiency of microbial protein synthesis (98.9 g/kg tdn), pun concentrations (21.3 mg/dl) and mun (18.2 mg/dl) were similar for cactus processing and for the manner in which diet was supplied. forage-machine cactus processing improves dry matter intake and total mixed ration supply avoids selectivity.
Desempenho produtivo de vacas 5/8 Holando/Zebu alimentadas com diferentes cultivares de palma forrageira (Opuntia e Nopalea)
Santos, Djalma Cordeiro dos;Santos, Mércia Virginia Ferrreira dos;Farias, Iderval;Dias, Flávio Marcos;Lira, Mário de Andrade;
Revista Brasileira de Zootecnia , 2001, DOI: 10.1590/S1516-35982001000100003
Abstract: the effect of different cactus forage cultivars upon the productive performance of 5/8 holstein/zebu dairy cows was studied. a latin square design was used in an alternative assay distribution, with three squares and three periods of 28 day each. the treatments were constituted of the cactus cultivars "redonda", "gigante" and "miúda". a few variations in the chemical composition were observed among cactus cultivars. no differences were observed as for fresh cactus forage and corn stalks intake, and dry matter intake, among the animal fed different cactus cultivars, with 54.21, 7.91, and 9.04 kg/day, respectively. also, no difference was observed for milk yield, 4% corrected fat milk yield and dry matter intake per milk yield. the data suggested that crossbred dairy cows could be fed with different cactus forage cultivars, without reducing their productive performance.
IL-17 receptor signaling is required to control polymicrobial sepsis
A Freitas
Critical Care , 2009, DOI: 10.1186/cc7810
Abstract: Adult C57BL/6 WT and IL-17 receptor KO mice were subjected to nonsevere (NS-CLP) sepsis. Intraperitoneal neutrophil migration, bacteremia, cytokines and liver injury were evaluated 6 hours after surgery. The ability of IL-17 to mediate the neutrophil microbicidal activity in vitro, as well the neutrophil migration in vivo and in vitro, were also evaluated. It was observed that IL-17R-deficient mice, subjected to CLP-induced nonsevere sepsis, show reduced neutrophil recruitment into the peritoneal cavity, spread of infection, and increased systemic inflammatory response as compared with BL6 littermates. As a consequence, the mice showed an increased mortality rate. Moreover, IL-17 induced intraperitoneal neutrophil migration in vivo and in vitro. Besides, we demonstrated that neutrophils harvested from IL-17R-defective mice already show reduced microbicidal activity, compared with WT neutrophils, suggesting a physiological role of IL-17R signaling in the microbicidal activity of neutrophils. Furthermore, WT neutrophils treated with IL-17 showed strong enhancement of microbicidal activity by a mechanism dependent on nitric oxide.Taken together, our results demonstrate that IL-17 receptor signalization plays a critical role in host protection during polymicrobial sepsis.Supported by FAPESP/CNPq/FAEPA.
Indústria cultural: o empobrecimento narcísico da subjetividade
Freitas, Verlaine;
Kriterion: Revista de Filosofia , 2005, DOI: 10.1590/S0100-512X2005000200016
Abstract: the goal of the text is to analyze the critical dimension of the cultural industry concept as proposed by adorno and horkheimer, starting from the psychoanalytical notion of narcissism such as adorno has interpreted it. the mass culture is to be seen as offering the radically illusory pleasure of satisfying the anxiety of magnification of the ego, exactly in the moment when it keeps the individual within the inertial tendencies of the social unity.
Constru??o e Desconstru??o da Rela??o entre Migra??es For?adas e Desafios de Seguran?a em áfrica
Cadernos de Estudos Africanos , 2011,
Abstract: the debate on transnational challenges to security is framed within the context of the blurring of the traditional concept of state, centred on a territory delimited by borders and with a monopoly of legitimate physical violence. in the african context the debate is guided by two important dimensions: political will and the capacity of the state to protect its citizens. this article suggests that at least the political will dimension is largely constrained by the interpretation of the state on issues of citizenship, in a context where ethnicity is a structuring element of relations and belongings much more powerful than that of citizenship and encompasses the transnational dimension of such relations. therefore, it is argued that forced migrations should be framed within a societal context, focusing on the role of local populations and local contexts of violence and peace as well as the regional dynamics of integration or rejection of those who flee. in this process it is important to understand the way in which forced migrations are framed as a cause or consequence of insecurity.
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