oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 7 )

2018 ( 6 )

2017 ( 8 )

2016 ( 13 )

Custom range...

Search Results: 1 - 10 of 4701 matches for " Raul CHAVES "
All listed articles are free for downloading (OA Articles)
Page 1 /4701
Display every page Item
Phylogenetic tree calculations using the Grid with DAG job
Raul Isea,Juan L. Chaves,Fernando Blanco,Rafael Mayo
Quantitative Biology , 2010,
Abstract: The goal of the work is to implement molecular phylogenetic calculations using the Grid paradigm by means of the MrBayes software using Directed Acyclic Graphs (DAG) jobs. In this method, a set of jobs depends on the input or the output of other jobs. Once the runs have been successfully done, all the results can be collected by a specific Perl script inside the defined DAG job. For testing this methodology, we calculate the evolution of papillomavirus with 121 sequences.
Avalia??o de um teste imunoenzimático competitivo no diagnóstico sorológico da brucelose em búfalos (Bubalus bubalis)
Mathias, Luis A.;Chaves, Lucila F.;Girio, Raul J. S.;Del Fava, C.;
Pesquisa Veterinária Brasileira , 1998, DOI: 10.1590/S0100-736X1998000300004
Abstract: the competitive enzyme immunoassay (ceia) for the serological diagnosis of brucellosis in buffaloes (bubalus bubalis) was evaluated by comparing its results with those obtained by the complement fixation test (cft) and rose bengal test (rbt). four hundred and seventy-seven sera were tested by ceia and rbt, and 465 of these were tested by cft. sera with a titre equal to or higher than 1/4 in cft and ceia were considered as positive. to determine the relative sensitivity and specificity of ceia, animals with a positive result to rbt and to cft were considered as diseased, and animals with a negative result to both of those tests were considered as non diseased. sera with disagreeing results for both of these tests were excluded from the analysis. the results showed an agreement of 97.42% between ceia and cft and an agreement of 95.39% between ceia and rbt. the relative sensitivity of ceia was 100% and its relative specificity 98.55%. these data show that the performance of ceia little differed from the one of the other two tests, suggesting that ceia may be an useful tool for the serological diagnosis of brucellosis in buffaloes.
Avalia o de um teste imunoenzimático competitivo no diagnóstico sorológico da brucelose em búfalos (Bubalus bubalis)
Mathias Luis A.,Chaves Lucila F.,Girio Raul J. S.,Del Fava C.
Pesquisa Veterinária Brasileira , 1998,
Abstract: O trabalho teve por objetivo avaliar o teste imunoenzimático competitivo (CEIA) para uso no diagnóstico sorológico da brucelose em búfalos (Bubalus bubalis), comparando seus resultados com aqueles obtidos na rea o de fixa o de complemento (CFT) e no teste rosa Bengala (RBT). Foram examinados 477 soros por meio do CEIA e do RBT e 465, desses mesmos soros, por meio da CFT. Na CFT e no CEIA, soros com títulos maiores ou iguais a 1/4 foram considerados positivos. Para a determina o da sensibibilidade e da especificidade relativas do CEIA, foram considerados como doentes os animais com resultados positivos no RBT e na CFT e s os os animais com resultados negativos nesses dois testes. Soros com resultados discordantes nesses duas provas foram eliminados da análise. Os resultados apontaram uma concordancia de 97,42% entre o CEIA e a CFT e uma concordancia de 95,39% entre o CEIA e o RBT. A sensibilidade relativa do CEIA foi de 100% e a especificidade relativa do teste foi de 98,55%. Esses dados mostram que o desempenho do CEIA diferiu pouco do desempenho dos outros dois testes, sugerindo que o mesmo pode constituir um recurso útil para o diagnóstico sorológico da brucelose em búfalos.
Evolu o de títulos sorológicos, nas provas de soroaglutina o em placa, antígeno acidificado tamponado e fixa o de complemento, em bezerras Nelore vacinadas aos 18 meses de idade com Brucella abortus amostra B 19
Mathias Luis A.,Chaves Lucila F.,Chen Anne A.,Girio Raul J. S.
Pesquisa Veterinária Brasileira , 2001,
Abstract: Com o objetivo de estudar a persistência da resposta sorológica, através das provas de soroaglutina o em placa, rosa Bengala e fixa o de complemento, 108 bezerras, com idade ao redor de 18 meses, foram vacinadas com uma dose padr o da vacina preparada com Brucella abortus amostra B 19. Foram obtidas amostras de soro sangüíneo antes da vacina o e após 45 dias, 6, 12 e 18 meses. Antes da vacina o, todas as bezerras apresentaram resultados negativos nos três testes. Após 45 dias, todas apresentaram título a partir de 1/100 na prova de soroaglutina o em placa e todas apresentaram resultado positivo no teste rosa Bengala, ao passo que dois animais apresentaram título 1/2 e os demais apresentaram título a partir de 1/4 na rea o de fixa o de complemento. Após um ano de vacina o, a grande maioria das bezerras já n o apresentava título sorológico significativo. Considerando o risco a que est o sujeitos animais que vivem em áreas endêmicas e em propriedades onde a doen a ocorre, e considerando a acentuada redu o de título sorológico observada na grande maioria dos animais, pode-se concluir que, no caso bezerras de ra as zebuínas em áreas endêmicas e que n o tenham sido vacinadas na idade regulamentar, é mais vantajoso vaciná-las com a amostra B 19 aos 18 meses de idade do que deixá-las expostas a um elevado risco de infec o por Brucella.
Correla es entre caracteres silvicuturais durante o crescimento de Eucalyptus grandis Hill ex Maiden. Correlations between forestry characters during Eucalyptus grandis Hill ex Maiden growth.
Léo ZIMBACK,Edson Seizo MORI,Thiago Fernandes BRIZOLLA,Raul CHAVES
Revista do Instituto Florestal , 2011,
Abstract: A espécie Eucalyptus grandis é a mais comumente cultivada em estandes comerciais no Brasil e no mundo. A espécie é plantada como cultivar e também na forma de plantios clonais de seus híbridos interespecíficos. Este trabalho é um estudo da variabilidade genética em progênies de poliniza o livre de Eucalyptus grandis (Hill) Maiden, oriundas de pomar de sementes por muda, cuja procedência é originária de Coff’s Harbour – Austrália, de propriedade da empresa Duratex S.A., localizado na Fazenda Morro D’Ouro, no município de Botucatu. Teve como objetivo analisar as correla es entre diferentes caracteres nas diferentes idades, visando subsidiar a sele o precoce em programas de melhoramento para essa espécie. Os ensaios foram instalados em dois locais, Angatuba–SP e Len óis Paulista–SP, em fevereiro de 1988. O delineamento experimental utilizado foi o de blocos casualizados, com dez repeti es, seis plantas por parcela, ao espa amento de 3 x 2 m e totalizando 76 progênies. Os caracteres avaliados foram: (1) diametro à altura do peito – (DAP); altura total e volume de madeira. As avalia es foram feitas em quatro anos iniciando a partir do segundo ano em Len óis Paulista (local 2) até o quinto ano, sendo que em Angatuba (local 1) foram realizadas avalia es anuais do segundo ao sexto ano. Os resultados mostraram que as correla es entre os caracteres de crescimento apresentaram valores elevados (0,69 a 0,99), tanto genéticos como fenotípicos, facilitando os procedimentos de sele o no avan o das gera es de melhoramento, podendo ser realizada desde o terceiro ano de idade com maior peso para DAP e volume em um índice de sele o.The species Eucalyptus grandis (Hill) Maiden is the most commercial tree cultivated in Brazil and throughout the world. It is planted as varieties and also as interspecific hybrid clonal plantings. This work is a study of genetic variation in open pollinated progenies, a seedling seed orchard of E. grandis from a Coff’s Harbour provenance, located at Morro D’Ouro Duratex S.A., in the Experimental Station in Botucatu County, S o Paulo, Brazil. The aim was to analyze correlations between different traits by different ages, aiming to support earlier selection in eucalypt breeding programs. The trials were set up in two locals, Angatuba–SP and Len óis Paulista–SP, Brazil, in February 1988. Randomized blocks with ten replications, six plants per plot, in 3 x 2 m spacing, totalizing 76 progenies was the experimental design used. The evaluated traits were: (1) diameter at breast height – DBH, plant height and wood volume. The evaluations wer
Designing a Nano Infrastructure for Brazil’s Amazon Water Resources: A Quadruple Helix Approach  [PDF]
Raul Gouvea
Journal of Water Resource and Protection (JWARP) , 2015, DOI: 10.4236/jwarp.2015.71005
Abstract: This paper elaborates on the role of green technologies and innovations in “greening” Brazil’s Amazon region fresh water resources. The paper elaborates on the development of an innovation quadruple helix to better manage the region’s water resources. Brazil accounts for close to 12% of the earth’s fresh water reserves, while most of it is in the Amazon region. The preservation of water reserves on a global scale is of paramount importance in the 21st century. Brazil, however, has not managed its water resources effectively leading to the increasing pollution and contamination of its Amazonian water resources.
Evolu??o de títulos sorológicos, nas provas de soroaglutina??o em placa, antígeno acidificado tamponado e fixa??o de complemento, em bezerras Nelore vacinadas aos 18 meses de idade com Brucella abortus amostra B 19
Mathias, Luis A.;Chaves, Lucila F.;Chen, Anne A.;Girio, Raul J. S.;Valério Neto, Walter;
Pesquisa Veterinária Brasileira , 2001, DOI: 10.1590/S0100-736X2001000400002
Abstract: one hundred and eight nelore heifers (bos indicus) about 18 months of age were vaccinated with a standard dosage (60-120 x 109 viable organisms) of brucella abortus strain 19 vaccine, aiming at to study the persistence of serological antibody titres by the plate agglutination, rose bengal and complement fixation tests. serum samples were collected just before vaccination and after 45 days, 6, 12 and 18 months. before the vaccination, all the heifers showed negative results by the three tests. after 45 days, all the heifers had titres higher than or equal to 1/100 by the plate agglutination test and all of them showed positive results by the rose bengal plate test, while 2 animals had titre 1/2 and 106 animals had titres higher than or equal to 1/4 by the complement fixation test. one year after the vaccination, most of the heifers did not show significant serological antibody titres. considering the risk to which animals in endemic areas and infected herds are subjected, and considering the clear reduction of the serological antibody titres shown by most of the vaccinated heifers, one may assume that, in case of nelore heifers in endemic areas and that were not vaccinated between 3 and 8 months of age, it would be more reasonable to vaccinate them at 18 months of age than to expose them to a high risk of brucella infection.
Subhalo abundance matching and assembly bias in the EAGLE simulation
Jonás Chaves-Montero,Raul E. Angulo,Joop Schaye,Matthieu Schaller,Robert A. Crain,Michelle Furlong
Physics , 2015,
Abstract: Subhalo abundance matching (SHAM) is a widely-used method to connect galaxies with dark matter structures in numerical simulations. SHAM predictions agree remarkably well with observations, yet they still lack strong theoretical support. Here we examine the performance, search for the best implementation, and analyse the key assumptions of SHAM using cosmological simulations from the EAGLE project. We find that $V_{\rm relax}$, the highest value of the circular velocity attained by a subhalo while it satisfies a relaxation criterion, is the subhalo property that correlates most strongly with galaxy stellar mass ($M_{\rm star}$). Using this parameter in SHAM, we retrieve the real-space clustering of EAGLE to within our statistical uncertainties on scales greater than $2$ Mpc for galaxies with $8.77<\log_{10}(M_{\rm star}[M_\odot])<10.77$. On the other hand, clustering is overestimated by $30\%$ on scales below $2$ Mpc because SHAM slightly overpredicts the fraction of satellites in massive haloes. The agreement is even better in redshift space, where the clustering in EAGLE is recovered to within our statistical uncertainties for all masses and separations. Additionally, we analyse the dependence of galaxy clustering on properties other than halo mass, i.e. the assembly bias. We demonstrate that assembly bias alters the clustering in EAGLE by $25\%$ and that $V_{\rm relax}$ captures its effect to within $15\%$. We trace the small but systematic difference in the predicted clustering of SHAM and EAGLE galaxies to the failure of a fundamental assumption of SHAM: for the same $V_{\rm relax}$, central and satellite subhaloes do not host statistically the same galaxies independently of the host halo mass.
Lazy or Greedy? Impact of Xenophobic Beliefs on Natives’ Attitudes towards Redistribution  [PDF]
Raul Magni Berton
Open Journal of Political Science (OJPS) , 2013, DOI: 10.4236/ojps.2013.31005
Abstract:

Several recent accounts have shown that anti-immigrant feeling among citizens seems to reduce the support for the welfare state. As a consequence, the rise of immigration could produce a deep change in industrialized countries’ social security systems. This paper provides evidence that support for redistribution is not decreased by generic xenophobia, but by a specific kind of xenophobic belief. It also shows that some other xenophobic beliefs tend rather to produce a demand for governmental protection programs. Based on a multivariate analysis on individual and contextual French data, findings show that the support for social protection programs is positively related to the fear of competition from immigrants and negatively with the fear that immigrants strain the welfare state. This result can be generalized to other countries where “redistributive xenophobia” is much more widespread.

Reassessing Export Diversification Strategies: A Cross-Country Comparison  [PDF]
Raul Gouvea, Gautam Vora
Modern Economy (ME) , 2015, DOI: 10.4236/me.2015.61009
Abstract: This article uses a sample of 44 countries to assess their export performance over the period 1988-2012, using the single-index model, a part of the modern portfolio theory. The article builds four clusters of countries classified by the dominance of exports of 1) fuel products, 2) manufactured products, 3) food items and agricultural products and 4) ores and minerals. All countries in the sample obtain a dominant majority of their export earnings from these broad categories of products. The results are that the export portfolios comprised of manufactured products have a superior performance than export portfolios comprised of non-manufactured products. In particular, from a risk-return perspective the export portfolio of manufactured products dominates the export portfolio of food items and agricultural products which in turn dominates the export portfolio of fuel products and of ores and minerals. This domination validates a priori belief that manufacturing goods and exports is the best strategy for development of exports of a country. An important caveat is that this rosy scenario is unlikely to last. The implications for countries and firms are also discussed.
Page 1 /4701
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.