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Search Results: 1 - 10 of 119395 matches for " José Ant?nio Aleixo da;Lira "
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Utiliza??o de técnicas multivariadas na avalia??o da divergência genética entre clones de palma forrageira (Opuntia ficus-indica Mill.)
Ferreira, Carlos Adonai;Ferreira, Rinaldo Luiz Caraciolo;Santos, Djalma Cordeiro dos;Santos, Mércia Virginia Ferreira dos;Silva, José Antnio Aleixo da;Lira, Mário de Andrade;Molica, Silmar Gonzaga;
Revista Brasileira de Zootecnia , 2003, DOI: 10.1590/S1516-35982003000700004
Abstract: through multivariate techniques the phenetic divergence among clones of cactus forage was evaluated, in an experiment installed at experimental station of the empresa pernambucana de pesquisa agropecuária - ipa, caruaru - pe. the experimental design was a complete block design, with three blocks. the treatments were 19 clones of cactus forage of the bank of germoplasma of ipa. it was measured: a) measures in cladodios, according to the order: length, width, thickness, number and weight of the green matter; b) measures by plant: thorn presence, number of cladodios for order and total, total height, infestation for cochineal and weight of the green matter. it was applied the univariate analyses of variance (anova) and multivariate (manova), the canonical variables (cv) and cluster analysis (ca). in anova difference were verified among the averages of clones. differences among vectors of averages of clones were detected by means of manova. it was possible to reduce the original dimensionality for two dimensions, that explained of 85.03% of the total variation, by applicating vc. the infestation percentage by cochineal was considered a characteristics susceptible to discard. in ca was discriminated nine group. in the studied conditions, the characteristic infestation percentage for cochineal should not be included in the study of the genetic diversity; the characteristics of larger discrimination were thickness average for cladodio primary, secondary and tertiary, number of primary cladodio and medium weights of green matter for secondary and tertiary cladodio, in a program of crossing of cactus forage, it must be considered the group of clones and the clone performance as characteristics with higher agronomic relevance and animal science.
Sele??o de variáveis em modelos matemáticos dos parametros de cultivo do camar?o marinho Litopenaeus vannamei
Bezerra, Ady Marinho;Silva, José Antnio Aleixo da;Mendes, Paulo de Paula;
Pesquisa Agropecuária Brasileira , 2007, DOI: 10.1590/S0100-204X2007000300012
Abstract: the objective of this work was to select management variables of the marine shrimp litopenaeus vannamei that most influenced culture variable responses (production, productivity, final weight and survival rate), in mathematical models. the database was composed of 83 cultures in the period of 2003 to 2005, obtained from a shrimp farm located in the south coast of pernambuco. to estimate the parameters of the models it was used the technique of least square. the selection of variable was carried through the backward elimination process associated to the box and cox transformation. the adequacy of the equations and the hypothesis of normality and homogeneous variance for the errors were analyzed based on the analysis of variance and on the analysis of residuals. it is possible to correlate those variables and to establish predictions with the equations.
PCR Multiplex para detec??o de staphylococcus aureus enterotoxigênicos isolados de alimentos de origem animal no sul do rio grande do sul, Brasil
Zocche,Fernando; Correa Fran?a,Rodrigo; Guimar?es Aleixo,José Antnio; Nunes Moreira,?ngela; Padilha Da Silva,Wladimir;
Interciencia , 2009,
Abstract: the object of this work was to develop two multiplex pcr (mpcr) for the detection of genes of staphylococcal enterotoxins (ee) a (sea), b (seb), c (sec) and d (sed) of staphylococcus aureus isolated from food of animal origin and to relate the presence of the genes with the origin of the microorganism. the two mpcr were standardized using strains of s. aureus whose toxigenic capacity was previously confirmed through indirect elisa, with the use of reference toxins and serum antitoxins. in six (12%) out of 50 isolates of s. aureus it was possible to detect one or more genes of ee; one isolate harbored sea and seb genes, three isolates harbored seb and two harbored sed. the two sets of mpcr developed are efficient for the detection of the sea, seb, sec and sed, and, considering the existing association of enterotoxigenic s. aureus genes sea and seb with human beings and genes sec and sed with other animals, the most likely origin of the majority of the isolates are the food handlers.
Ecological succession of a stretch of Dense Rain Forest in the Lowlands, Carauari, Amazonas, Brazil Sucess o ecológica de um trecho de Floresta Ombrófila Densa de Terras Baixas, Carauari, Amazonas
Rosival Barros de Andrade Lima,José Antnio Aleixo da Silva,Luiz Carlos Marangon,Rinaldo Luiz Caraciolo Ferreira
Pesquisa Florestal Brasileira , 2011, DOI: 10.4336/2012.pfb.67.161
Abstract: This work was carried out in a stretch of Dense Rain Forest in the lowland county of Carauari, Amazonas, aiming to estimate the species composition of tree layer and classify the species in their ecological groups in order to obtain information about the current situation of the forest fragment, to be the basis for strategies for conservation and preservation as well as the basis for formulating research aimed at the dissemination of knowledge and its application to sustainable production. The forest inventory was conducted in an area of 275 ha, crossed by three transects (822 m, 1,265 m and 2,349 m), totaling 4.436 m. Plots were installed in 20 m x 25 m, 50 m equidistant, merged to the right and left of the line transect, totaling 66 sampling units. All tree individuals trees that had a circumference of 1,30 m above the ground (CAP) ≥ 25 cm were identified and measured. There were 3,050 individuals distributed in 133 species, 93 genera and 49 families. It was observed that the species of early succession (pioneer + early secondary) were more numerous, showing characteristics of a forest in early successional stage. doi: 10.4336/2011.pfb.31.67.161 O presente trabalho foi realizado em um trecho de Floresta Ombrofila Densa de Terras Baixas no Municipio de Carauari, Amazonas, tendo como objetivo estimar a composicao floristica do estrato arboreo e classificar as especies nos respectivos grupos ecologicos, a fim de se obter informacoes sobre a atual situacao do fragmento florestal, para embasar estrategias de conservacao e preservacao, bem como embasar a formulacao de pesquisas que visem a disseminacao do conhecimento e sua aplicacao na producao sustentavel. O inventario florestal foi realizado em uma area de 275 ha, cortada por tres transectos (822 m, 1.265 m e 2.349 m), totalizando 4.436 m. Foram instaladas parcelas de 20 m x 25 m, equidistantes a cada 50 m e intercaladas a direita e a esquerda da linha do transecto, totalizando 66 unidades amostrais. Foram identificados e medidos todos os individuos arboreos que apresentaram circunferencia a 1,30 m do solo (CAP) ≥ 25 cm. Registraram-se 3.050 individuos, distribuidos em 133 especies, 93 generos e 49 familias. Quanto a classificacao sucessional, as especies de inicio de sucessao (pioneiras + secundarias iniciais) foram em maior numero, demonstrando caracteristicas de uma floresta em estagio inicial no desenvolvimento sucessional. doi: 10.4336/2011.pfb.31.67.161
Distin??o de grupos ecológicos de espécies florestais por meio de técnicas multivariadas
Santos, José Humberto da Silva;Ferreira, Rinaldo Luiz Caraciolo;Silva, José Antnio Aleixo da;Souza, Agostinho Lopes de;Santos, Eufrázio de Souza;Meunier, Isabelle Maria Jacqueline;
Revista árvore , 2004, DOI: 10.1590/S0100-67622004000300010
Abstract: the objective of this research was to apply multivariete techniques analysis to separate ecological groups. data of 37 tree species, in area without intervention, obtained in ten years of survey by the experiment of sustainable production in secondary forest of transition, established in 1986, at rio vermelho and serra azul de minas, minas gerais state, brazil were used. the species were separated in pioneers, early secondary and old secondary. the considered variables were: number of trees per hectare, number of ingrowth, mortality, basal area, volume, mean diameter, increment in diameter, increment in basal area, increment in volume, index of value of importance and natural regeneration. principal components analysis (pca); cluster analysis (ca) and the discriminant analysis (da) were used. by pca it was possible to reduce the dimension to three-dimensional with variance explanation above 79%. in the ca, seeking a classification at posteriori, it was observed that group formation did not correspond to the classification at priori. with the da, 92.86 and 57.14% of classification at posteriori and at priori respectively were correct. in conclusion: the use of the principal components analysis, cluster analysis and discriminant analysis allowed the identification of tree species that should be classified in a larger number of ecological groups; and the application of pca, ca and da in the evaluation of at priori classification confirms most researchers' subjectivity in classifying ecological groups of tree species.
Compara??o de duas metodologias multivariadas no estudo de similaridade entre fragmentos de Floresta Atlantica
Ferreira, Rinaldo Luiz Caraciolo;Mota, Adalmeres Cavalcanti da;Silva, José Antnio Aleixo da;Marangon, Luiz Carlos;Santos, Eufrázio de Souza;
Revista árvore , 2008, DOI: 10.1590/S0100-67622008000300012
Abstract: the objective of this work was to compare two multivariate methodologies in similarity studies among atlantic forest fragments. a bibliographical survey was carried out, and databanks were set up from 11 fragments of atlantic forest located in the states of pernambuco, rio grande do norte, minas gerais, s?o paulo and rio de janeiro. the study of the floristic similarity was constructed using two methodologies of the multivariate analysis. for the usual methodology, a binary matrix (presence/absence) of 236 tree species present in the 11 fragments was used. a cluster analysis was applied using the simple linkage method and the jaccard's coefficient. in the proposed methodology, the principal components analysis was used for reducing the size of the density matrix and absolute dominancy of the 236 tree species, using the principal component scores to apply the cluster analysis by the euclidean distance single linkage method. two groups were identified; one in the northeastern region (pernambuco) and another in the southeastern region (minas gerais). the proposed methodology identified only one group with fragments in the northeastern region (pernambuco), standing out that the quantitative variables are of utmost importance for the association of forests in different regions. the proposal methodology has potential for use in the study of forest fragment similarity.
Estabilidade em análise de agrupamento: estudo de caso em ciência florestal
Albuquerque, Márcio Augusto de;Ferreira, Rinaldo Luiz Caraciolo;Silva, José Antnio Aleixo da;Santos, Eufrázio de Souza;Stosic, Borko;Souza, Agostinho Lopes de;
Revista árvore , 2006, DOI: 10.1590/S0100-67622006000200013
Abstract: the main objective of this research was to propose a system to the study and interpretation of stability in cluster analysis through several cluster algorithms in vegetation data. the data set used derived from a survey in the silviculture forest at federal university of vi?osa - mg. to perform the cluster analysis, the mahalanobis distance matrices were estimated on basis of original data and bootstrap resampling. also, the single linkage, complete linkage, average distances, centroid, median and ward methods were used. chi-square test was applied to detect the association among the methods. a co-phenetic correlation was obtained for the cluster methods. the results for the method associations were very similar, indicating that any algorithm of the studied clusters is stabilized, and in fact, that groups exist among the analyzed individuals. however, it was verified that the methods are coincident, except for the centroid and ward, and also the centroid and median methods, when compared to ward, respectively, based on the mahalanobis matrices derived from the original data set and bootstrap. the methodology proposed is promising to the study and interpretation of the stability of cluster analysis methods in vegetation data.
Compara??o de métodos de prognose da estrutura diamétrica de uma floresta estacional semidecidual secundária
Austregésilo, Suely Lundreeng;Ferreira, Rinaldo Luiz Caraciolo;Silva, José Antnio Aleixo da;Souza, Agostinho Lopes de;Meunier, Isabelle Maria Jacqueline;Santos, Eufrázio de Souza;
Revista árvore , 2004, DOI: 10.1590/S0100-67622004000200009
Abstract: this research aimed to compare prognoses of the diameter distribution of a seasonal secondary semidecidual forest using the movement ratio, wahlenberg and the transition methods. the data used was obtained during a 10-year survey of sustainable production in a secondary forest implanted in 1986 by the vale do rio doce company in vermelho and serra azul de minas, minas gerais, brazil. only the data regarding an area without intervention was used and the trees were grouped by class of 5 cm diameter. growth ratio analyses were carried out from 1986 to 1996 every two years. the diameter structure prognoses for 1994 and 1996 were made by using the movement ratio, wahlenberg and matrix transition methods by comparing with the actual structure. to test the consistency of the prognosis obtained by each method, the kolmogorov-smirnov test (p = 0.05) was used. for the mean number of trees, the prognoses obtained by the three methods were similar to the actual structure, in 1994 and 1996. however, for diameter distribution, the methods were not efficient when compared with the actual structure. it was concluded that the movement ratio, wahlenberg and matrix transition methods were efficient in prognosing the mean number of trees/ha; the methods movement ratio, however they were not efficient in prognosing diameter distribution.
Avalia o bromatológica de espécies arbóreas e arbustivas de pastagens em três municípios do Estado de Pernambuco = Chemical composition of tree and bush species occurring in pastures of three locations in Pernambuco State
Anália Carmem Silva de Almeida,Rinaldo Luiz Caraciolo Ferreira,Mércia Virgínia Ferreira dos Santos,José Antnio Aleixo da Silva
Acta Scientiarum : Animal Sciences , 2006,
Abstract: A pesquisa foi realizada nos Campos Experimentais de Itambé, Caruaru e Serra Talhada, pertencentes à Empresa Pernambucana de Pesquisa Agropecuária, e objetivou avaliar características bromatológicas de espécies arbóreas e arbustivas de pastagens. Para análises bromatológicas foram coletadas, nas épocas seca e chuvosa, amostras compostas de folhas e galhos com até 5,0 cm de diametro de espécies arbóreas e arbustivas presentes em áreas de pastagens. Os teores médios de MS das plantas foram de 38,89%, 48,27% e 55,20% nos Municípios de Itambé, Caruaru e Serra Talhada, respectivamente. Para PB, observou-se valores de 15,87%, 14,09% e 10,19%, respectivamente. Os valores de FDN e de FDA foram de 52,37% e 37,63%, 46,33% e 30,33%, 50,25% e 35,07%, respectivamente. As espécies, independente do local, apresentaram melhor composi o bromatológica no período chuvoso.Para utiliza o de espécies em sistemas silvipastoris, além da avalia o de características qualitativas, devem-se considerar aspectos de facilidade de propaga o, adapta o às condi es edafoclimáticas, tipo de animal e objetivo do sistema de produ o animal. The research was conducted at the Experimental Fields of Itambé, Caruaru and Serra Talhada, owned by the Agricultural Research Companyof Pernambuco (IPA). The aim was to analyze the chemical characteristics of tree and bush species grown on pasture land. In each Experimental Station, data was collected from a random sampling, during the dry and rainy seasons. Samples consisted of leaves and branches up to 5.0 cm of diameter. The average MS concentrations were 38.89, 48.27 and 55.20%. As for PB, the values observed were 15.87, 14.09 and 10.19%. The NFD and ADF concentrations were 52.37 and 37.63, 46.33 and 30.33, 50.25 and 35.07%, for Itambé, Caruaru and Serra Talhada, respectively. The studied species, independent of the region, presented better chemistry composition during the rainy season. Thus, for an adequate selection of species in silvopastoral systems, besides the evaluation of qualitative characteristics, other aspects should also be taken into consideration such as propagation,adaptation to the soil and climate conditions, animal type and objective of the animal system production.
Variabilidade e herdabilidade de caracteres morfológicos em clones de capim-elefante na Zona da Mata de Pernambuco
Silva, Antnio Luiz Cordeiro da;Santos, Mércia Virginia Ferreira dos;Dubeux Júnior, José Carlos Batista;Lira, Mario de Andrade;Ferreira, Rinaldo Luiz Caraciolo;Freitas, Erinaldo Viana de;Cunha, Márcio Vieira da;Silva, Maria da Concei??o;
Revista Brasileira de Zootecnia , 2010, DOI: 10.1590/S1516-35982010001000005
Abstract: this research was carried out at to evaluate the variability and heritability of morphologic traits in 54 elephant grass clones (three local controls and 51 from the renace/cnpgl) in the forest zone in pernambuco. it was used a complete randomized block design with additional controls. three cuts were performed on the 60th day of regrowth. there were significant differences for stem diameter, basal and aerial tillers density, width of leaf 3, length of leaf 5, leaf blade percentage, stem percentage, and leaf/stem ratio. clones of renace are similar to the ones traditionally cultivated in the conditions of forest zone in pernambuco regarded to morphological characters. cultivar pioneiro showed early flourishing in the environmental conditions of this study. number of basal and aerial/metter tillers showed good heritability, evidencing little influence of the environment on variability among the clones. considering the variability among renace clones for basal and aerial tillers/m and leaf/stem ratio and the high heritability of these characters, it is possible to obtain genetic gains for these traits in the elephant grass breeding program in the forest zone in pernambuco.
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