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Search Results: 1 - 10 of 760 matches for " Vanderley;Sobrinho "
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Repetibilidade de características agron?micas e número de cortes necessários para sele??o de Urochloa ruziziensis
Souza Sobrinho, Fausto;Borges, Vanderley;Lédo, Francisco José da Silva;Kopp, Maurício Marini;
Pesquisa Agropecuária Brasileira , 2010, DOI: 10.1590/S0100-204X2010000600007
Abstract: the objective of this work was to estimate the repeatability of agronomic traits and to determine the appropriate number of cuts for selectig urochloa ruziziensis. one hundred and eighteen progenies of half-sib u. ruziziensis and four checks, the cultivars basilisk (u. decumbens), marandu (u. brizantha), comum (u. ruziziensis) and one access urochloa sp. were evaluated. a randomized complete block with two replications and plots in a 3.0-m line with 1.0x0.5-m spacing was used. seven cuts were made at intervals of 60 and 90 days in wet and dry seasons, respectively. the evaluated characteristics were: plant height, dry matter weight (dm), fresh matter weight (fm) and percentage of dry matter (pdm). the repeatability was estimated by analysis of variance, principal components of the covariance matrix and of the correlation matrix, and structural analysis using the correlation matrix. repeatability estimates varied from 0.31-0.38 for plant height, 0.31-0.43 for fm, 0.16-0.50 for pdm and 0.23-0.43 for dm, with coefficients of determination between 57-87%. the number of cuts necessary to assess the actual value of the characteristics ranged between 7-8 cuts for fm and plant height, and 10-14 for dm and pdm, with coefficients of determination greater than 80%.
Associa??o entre caracteres e análise de trilha na sele??o de progênies de meios-irm?os de Brachiaria ruziziensis
Borges, Vanderley;Sobrinho, Fausto Souza;Lédo, Francisco José da Silva;Kopp, Maurício Marini;
Revista Ceres , 2011, DOI: 10.1590/S0034-737X2011000600013
Abstract: high association between fresh and dry mass weight can facilitate early selection of superior genotypes of b. ruziziensis r. germ. & c.m. evrard. the aim of this study was to verify the associations between traits in the selection of b. ruziziensis genotypes. the experiment was arranged in a complete randomized block design with two replications. the traits evaluated were height and vigor of plants; weight of fresh mass and percentage of dry matter of the whole plant, stem and leaf; dry mass weight of total herbage, stem, and leaf and the ratio between productivity of leaf and stem. estimation of simple correlations and path analysis were performed considering the dry mass weight as the main variable. the correlations were mostly low, but significant higher correlations were observed between fresh mass weight and dry mass weight, dry weight of the stem and dry weight of leaves. the path coefficients showed that the direct effects of different explanatory variables on the dry mass weight were mostly low. more significant direct effects were obtained with fresh mass weight, stem dry weight and leaf dry weight, indicating that the fresh mass weight allows for the indirect selection for dry mass weight.
Histogram score contributes for reliability of DNA content estimatives in Brachiaria spp Notas do histograma contribuem para a confiabilidade das estimativas do conteúdo de DNA de Brachiaria spp
Ana Luiza de Oliveira Timbó,Roselaine Cristina Pereira,Vanderley Borges dos Santos,Fausto Souza Sobrinho
Ciência e Agrotecnologia , 2012, DOI: 10.1590/s1413-70542012000600001
Abstract: Flow cytometry allows to estimate the DNA content of a large number of plants quickly. However, inadequate protocols can compromise the reliability of these estimates leading to variations in the values of DNA content the same species. The objective of this study was to propose an efficient protocol to estimate the DNA content of Brachiaria spp. genotypes with different ploidy levels using flow cytometry. We evaluated four genotypes (B. ruziziensis diploid and artificially tetraploidized; a tetraploid B. brizantha and a natural triploid hybrid), three buffer solutions (MgSO4, Galbraith and Tris-HCl) and three species as internal reference standards (Raphanus sativus, Solanum lycopersicum e Pisum sativum). The variables measured were: histogram score (1-5), coefficient of variation and estimation of DNA content. The best combination for the analysis of Brachiaria spp. DNA content was the use of MgSO4 buffer with R. sativus as a internal reference standard. Genome sizes expressed in picograms of DNA are presented for all genotypes and the importance of the histogram score on the results reliability of DNA content analyses were discussed. A citometria de fluxo permite estimar o conteúdo de DNA de um grande número de plantas rapidamente. No entanto, protocolos inadequados podem comprometer a confiabilidade dessas estimativas, levando a varia es nos valores de conteúdo de DNA para uma mesma espécie. Neste trabalho, objetivou-se propor um protocolo eficiente para a estimativa do conteúdo de DNA de genótipos de Brachiaria spp. com diferentes níveis de ploidia, utilizando a citometria de fluxo. Foram avaliados quatro genótipos (B. ruziziensis, diploide e tetraploidizada artificialmente; B. brizantha tetraploide e um híbrido natural triploide), 3 solu es tamp es (MgSO4, Galbraith e Tris-HCl) e três espécies como padr es de referência interno (Raphanus sativus, Solanum lycopersicum e Pisum sativum). As variáveis mensuradas foram: nota do histograma (1 a 5), coeficiente de varia o e estimativa do conteúdo de DNA. A melhor combina o para as análises do conteúdo de DNA de Brachiaria spp. por citometria de fluxo foi o emprego do tamp o MgSO4 com o rabanete como padr o de referência. O tamanho dos genomas expresso em picogramas de DNA foi apresentado para todos os genótipos e a importancia da pontua o do histograma na confiabilidade dos resultados das análises do conteúdo de DNA foi discutida.
Enunciative Texts Present in Physical Issues of Editions of a Brazilian National Exam as Possible Triggers of Socio-Scientific Discussions  [PDF]
Marcos Fernandes-Sobrinho
Creative Education (CE) , 2018, DOI: 10.4236/ce.2018.92021
Abstract: In this article we identify and analyze texts on physics questions in seven editions of a Brazilian national exam, with the purpose of bringing contributions to teaching planning and pedagogical actions with the perspective of supporting the creation of socio-scientific discussions (SSD), capable of inducing students in their citizenship development, in view of the difficulties of being worked in Sciences/Physics teaching environments appointed by the literature. A Brazilian state was chosen as a field, whose locus included six municipalities and 12 public institutions of basic education. Given that the results seem to distort the reality of the school context, the aforementioned difficulties were then theoretically and empirically disassembled, proving to be potentially minimized with the establishment of trails that enable the teacher to work on SSD identified in materials of easy and universal access, which contributes with advancement in the field of Science-Technology-Society education.
Development of a methodology for microstructural description
Vasconcelos, Vanderley de;Vasconcelos, Wander L.;
Materials Research , 1999, DOI: 10.1590/S1516-14391999000300003
Abstract: a systematic methodology for microstructural description can help the task of obtaining the processing x microstructure x properties x performance relationships. there are, however, some difficulties in performing this task, which are related mainly to the following three factors: the complexity of the interactions between microstructural features; difficulties in evaluating geometric parameters of microstructural features; and difficulties in relating these geometric parameters to process variables. to solve some of these problems, it is proposed a methodology that embodies the following features: takes into account the different possible types of approaches for the microstructural description problem; includes concepts and tools of total quality management; is supported on techniques of system analysis; and makes use of computer modeling and simulation and statistical design of experiments tools. the methodology was applied on evaluating some topological parameters during sintering process and its results were compared with available experimental data.
Desenvolvimento de PVC refor?ado com resíduos de Pinus para substituir madeira convencional em diversas aplica??es
Rodolfo Jr., Antonio;John, Vanderley M.;
Polímeros , 2006, DOI: 10.1590/S0104-14282006000100005
Abstract: this work evaluates the technical viability of lignocellulosic vinyl composites, using residues of pinus elliottii and pinus taeda as the reinforcement fiber. a simple and economically viable process for the treatment of these industrial residues was developed. the process includes sieving, drying and treating the wood particles. treatment is made with functional lubricants and coupling agents used as additives in the pvc industry. extrusion was performed using traditional equipment available in the brazilian pvc processing industry. the effect on the processability of the variable concentrations of the residues incorporated and the type of agent used for the treatment had been evaluated, as well as in the final properties of the composite. the results show that the development of this kind of composite material is a viable alternative for the substitution of conventional wood in diverse applications.
Development of a methodology for microstructural description
Vasconcelos Vanderley de,Vasconcelos Wander L.
Materials Research , 1999,
Abstract: A systematic methodology for microstructural description can help the task of obtaining the processing x microstructure x properties x performance relationships. There are, however, some difficulties in performing this task, which are related mainly to the following three factors: the complexity of the interactions between microstructural features; difficulties in evaluating geometric parameters of microstructural features; and difficulties in relating these geometric parameters to process variables. To solve some of these problems, it is proposed a methodology that embodies the following features: takes into account the different possible types of approaches for the microstructural description problem; includes concepts and tools of Total Quality Management; is supported on techniques of system analysis; and makes use of computer modeling and simulation and statistical design of experiments tools. The methodology was applied on evaluating some topological parameters during sintering process and its results were compared with available experimental data.
On the finite space blow up of the solutions of the Swift-Hohenberg equation
Vanderley Ferreira Jr,Ederson Moreira dos Santos
Mathematics , 2014, DOI: 10.1007/s00526-015-0821-6
Abstract: The aim of this paper is to study the finite space blow up of the solutions for a class of fourth order differential equations. Our results answer a conjecture in [F. Gazzola and R. Pavani. Wide oscillation finite time blow up for solutions to nonlinear fourth order differential equations. Arch. Ration. Mech. Anal., 207(2):717--752, 2013] and they have implications on the nonexistence of beam oscillation given by traveling wave profile at low speed propagation.
Epistemological Contributions of Toulmin’s Argumentative Model in Scientific Education  [PDF]
Tiago Clarimundo Ramos, Marcos Fernandes-Sobrinho
Creative Education (CE) , 2018, DOI: 10.4236/ce.2018.94039
Abstract: On the basis of a theoretical study, the objective of this article is to analyze questions around the scientific rationality, with an indication of the potentialities of Toulmins model of argument that can subsidize the confrontation of the problem of scientific education practices landmarked of an absolute and neutral science. The use of this argumentative model is legitimated, mainly, with the possibility of refutation as a way of demonstrating that the theoretical knowledge is provisional conjectures. Thus, it is emphasized that any conception of science linked to the activity of isolated individuals in search of truth is not resonant even with social reality itself.
Evaluation of Endectocides and Conventional Acaricides in the Control of the Boophilus microplus on Field-Kept Dairy Cattle in the State of Pernambuco-Brazil  [PDF]
Vania Lucia Assis Santana, Maria Aparecida Da Gloria Faustino, Erika Korinfsky Vanderley, Marilene Maria Lima, Leucio Camara Alves
Open Journal of Veterinary Medicine (OJVM) , 2012, DOI: 10.4236/ojvm.2012.23021
Abstract: The aim of the present study was to evaluate different acaricide treatments for the control of Boophilus microplus on field-kept dairy cattle in the state of Pernambuco, Brazil. The first phase of the experiment consisted of collecting the ingurgitated female Boophilus microplus directly from the hosts for attainment of larvae. After the attainment of larvae, the artificial infestation procedure began on the cattle, with larvae ages ranging from 7 to 14 days. On Day 0, animals were separated into 12 groups to receive the corresponding treatment: Abamectin; Ivermectin; Ivermectin LA; Amitraz; Amitraz + Ivermectin; Amitraz + Ivermectin LA; Amitraz + Abamectin; Association (Cypermethrin + Chlorpyrifos + Citronella); Association + Ivermectin; Association + Ivermectin LA; Association + Abamectin; and Control. Subsequent evaluations were made on post-treatment days +7, +14, +21, +28, +35, +42, +49, +56 and +63. Analyzing the post-treatment effectiveness per day, indices revealed considerable variation ranging from 0% to 96.63%. Such indices demonstrate the significant reduction in the number of ticks on the animals in some groups, especially in the Abamectin group. The analysis of the results demonstrates that the use of different avermectines can assist in the development of Boophilus microplus control programs, thereby reducing the number of acaricide applications and production costs related to ticks.
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