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Search Results: 1 - 10 of 17407 matches for " Fabrício Augusto Hansel "
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Arqueologia biomolecular: passos preliminares para interpreta??es sobre a origem dos resíduos organicos preservados em fragmentos de ceramica pré-colonial no Brasil
Hansel, Fabrício Augusto;Mireski, Sandro Lucio;Madureira, Luiz Augusto dos Santos;Fossari, Teresa Domitila;
Química Nova , 2006, DOI: 10.1590/S0100-40422006000300004
Abstract: organic residue analysis of archaeological potsherds is a well-established method for determining the uses of european and north american pottery vessels. in the present work we assess if the organic residues identified in brazilian potsherd extracts are related to commodity processes (e.g. cooking or surface treatment) or to other non-archaeological sources, using as a model potsherds recovered from the rio do meio site (santa catarina island). the potsherd extracts are dominated by saturated fatty acids (ac16:0, with lower abundances of ac14:0 and ac18:0). our studies provide evidence that the organic residues preserved in the brazilian archeological potsherds are related to foodstuffs and surface treatment processes of the pottery vessels.
Lipídios em sedimentos arqueológicos: resultados preliminares do sítio arqueológico Rio do Meio, Ilha de Santa Catarina (SC)
Hansel, Fabrício Augusto;Fossari, Teresa Domitila;Madureira, Luiz Augusto dos Santos;
Revista Brasileira de Ciência do Solo , 2008, DOI: 10.1590/S0100-06832008000100013
Abstract: in this study the distribution of lipid compounds was evaluated in sediment samples of an archaeological site rio do meio, santa catarina island, brazil. in the total lipid extracts, analyzed by gas chromatography and mass spectrometry (gc and gc-ms), saturated fatty acids and alcohols were predominant. at least two sources of organic matter were detected, an older and a more recent one. in the old deposit, the most abundant lipids were short-chain fatty acids (< ac20:0), followed by a minor composition of long-chain fatty acids and alcohols (> ac20:0 and al20:0). in contrast, the fresh deposit was dominated by long-chain fatty acids and alcohols (> ac20:0 and al20:0). this paper described the incorporation of vegetal, bacterial and possible animal (fat) sources into the archaeological sediments analyzed.
Arqueologia biomolecular: passos preliminares para interpreta es sobre a origem dos resíduos organicos preservados em fragmentos de ceramica pré-colonial no Brasil
Hansel Fabrício Augusto,Mireski Sandro Lucio,Madureira Luiz Augusto dos Santos,Fossari Teresa Domitila
Química Nova , 2006,
Abstract: Organic residue analysis of archaeological potsherds is a well-established method for determining the uses of European and North American pottery vessels. In the present work we assess if the organic residues identified in Brazilian potsherd extracts are related to commodity processes (e.g. cooking or surface treatment) or to other non-archaeological sources, using as a model potsherds recovered from the Rio do Meio site (Santa Catarina Island). The potsherd extracts are dominated by saturated fatty acids (Ac16:0, with lower abundances of Ac14:0 and Ac18:0). Our studies provide evidence that the organic residues preserved in the Brazilian archeological potsherds are related to foodstuffs and surface treatment processes of the pottery vessels.
Estabelecimento in vitro de Ocotea odorifera, O. catharinensis e O. porosa In vitro Establishment of Ocotea odorifera, O. catharinensis and O. porosa
Aline Moritz,Juliana Degenhardt,Leonardo Ferreira Dutra,Fabrício Augusto Hansel
Pesquisa Florestal Brasileira , 2010, DOI: 10.4336/2012.pfb.59.37
Abstract: Várias espécies da família Lauraceae encontram-se em risco de extin o, devido ao alto valor comercial de suas madeiras e a consequente explora o das reservas naturais. Dentre elas, Ocotea porosa (imbuia), O. odorifera (canela-sassafras) e O. catharinensis (canela-preta) s o de grande importancia no Sul do Brasil, de onde s o originárias. Estas espécies apresentam sementes recalcitrantes, o que dificulta sua regenera o natural. Alem disso, a propaga o por meio de estaquia e enxertia apresenta limita es. Este trabalho teve por objetivo avaliar a germina o e multiplica o in vitro das canelas preta e sassafrás na presen a de BAP e carv o ativado e a germina o e multiplica o in vitro de imbuia sob diferentes concentra es de sacarose no meio de cultura. Para as canelas preta e sassafrás foram avaliadas duas concentra es de NaClO na desinfesta o de embri es (0,1 % e 0,5 %). Na fase de multiplica o, foi avaliado o efeito de BAP e carv o ativado. Para a imbuia, foi avaliada a influência da concentra o de sacarose (30, 60, 90 ou 120 g.L-1) na introdu o e multiplica o in vitro. A porcentagem de germina o foi superior a 85 % para as três espécies. Para a canela sassafrás, as melhores taxas de multiplica o foram obtidas na presen a de 5 μmol.L-1 de BAP. Para a imbuia, a concentra o de 60 g.L-1 de sacarose no meio proporcionou as maiores taxas de multiplica o. Apesar de o estabelecimento da canela preta ter sido satisfatório, após algumas semanas no meio de multiplica o os explantes n o apresentavam aparência normal e oxidaram. Doi: 10.4336/2009.pfb.59.37 Several species of the Lauraceae family are endangered, due to the high value of their woods, and the consequent exploitation of natural populations. Among them, Ocotea porosa, O. odorifera and O. catharinensis, native from South Brazil, have recalcitrant seeds, what makes even more dificult their natural regeneration. This work aimed to evaluate in vitro seed germination and multiplication of O. odorifera and O. catharinensis in culture medium supplemented with activated charcoal and/or BAP and in vitro seed germination and multiplication of O. porosa in culture medium supplemented with several concentrations of sucrose. The effect of BAP and activated charcoal were tested in the multiplication of O. catharinensis and O. odorifera and the effect of sucrose concentration (30, 60, 90 ou 120 g.L-1) was tested in the multiplication of O. porosa. The germination percentage was higher than 85% for all species. BAP promoted the highest multiplication rates for O. odorifera. O. porosa showed the best
Water repellency of sandy soil as a function of hydrophobic concentration Influência da concentra o de extratos hidrofóbicos na repelência à água em solos arenosos
Yorleni Chang Cambronero,Claudia Maria Branco de Freitas Maia,Renato Ant?nio Dedecek,Fabrício Augusto Hansel
Pesquisa Florestal Brasileira , 2011, DOI: 10.4336/2012.pfb.65.01
Abstract: Soil water repellency has been reported worldwide being most extremes cases observed in sandy soils. Soil water repellency is accepted to be caused by recovering of soil particles by hydrophobic compounds originated from plant decomposition. This work aimed to evaluate the influence of concentration of hydrophobic extracts from a forest soil under Pinus taeda on water repellency of sandy soil with different organic matter content. Hydrophobic compounds were extracted from a everely hydrophobic Lithosol, using chloroform:acetone, followed by isopropanol:ammonia. The water drops penetration time test (WDPT) was applied in dried samples under four temperatures, seven treatments (sand with 0%; 3%; 6.5%; 6.5% + 10% of humic acid (AH); 6,5% + 30% of AH; 6.5% + 50% of AH; and 10% of charcoal as organic matter), and three levels of hydrophobic extract. The extracted material induced hydrophobicity in all treatments, in variable intensity, but lower than those found in the original Lithosol. Treatments with extract level 1 (2.88 g kg-1) presented the highest times of water repellency. doi: 10.4336/2011.pfb.31.65.01 A repelência à água é estudada em vários solos do mundo, sendo os casos mais extremos encontrados em solos arenosos. Acredita-se que a repelência à água seja causada pelo recobrimento das partículas do solo por compostos hidrofóbicos derivados da decomposi o de plantas. Este trabalho avaliou a influência da concentra o de extratos hidrofóbicos de um Neossolo sob plantio de Pinus taeda, na repelência à água em amostras de um solo arenoso preparado em laboratório, com diferentes teores de matéria organica. Os extratos hidrofóbicos do solo original foram extraídos com clorofórmio:acetona, seguido de isopropanol:am nia. Os tratamentos constaram de mistura de areia com sete níveis de matéria organica (0%; 3%; 6,5%; 6,5% + 10% de ácido húmico (AH); 6,5% + 30% de AH; 6,5% + 50% de AH; e 10%), aos quais foram aplicadas três concentra es de extrato hidrofóbico (CEH). As amostras foram secas a diversas temperaturas antes dos testes de repelência. As CEHs induziram à repelência à água nos tratamentos, em diferentes intensidades, porém estes valores foram inferiores aos encontrados no solo original. Os tratamentos com CEH de 2,88 g kg-1 tiveram os maiores tempos de repelência. doi: 10.4336/2011.pfb.31.65.01
Assessment of lipid compounds and phosphorus in mangrove sediments of Santa Catarina Island, SC, Brazil
Mater, Luciana;Alexandre, Marcelo R.;Hansel, Fabrício A.;Madureira, Luiz A. S.;
Journal of the Brazilian Chemical Society , 2004, DOI: 10.1590/S0103-50532004000500019
Abstract: lipid compounds from seven sedimentary stations were used to assess sources of organic matter in two mangrove ecosystems located on santa catarina island, southern brazil. ratones mangrove forms part of a national preservation area and has suffered only minimal human influence. itacorubi mangrove has been seriously impacted by anthropogenic activities due to its proximity to the city of florianopolis. higher levels of total organic carbon (2.13 mmol g-1) and total phosphorus (14.9 μmol g-1) were found in ratones mangrove sediments. however, sediments from itacorubi showed a greater percentage of inorganic phosphorus (84%) than those from ratones (58%), which can be related to urban contamination. the importance of sewage outfalls into the tidal creeks crossing itacorubi mangrove was clearly seen as the concentration of coprostanol averaging 7.7 ng g-1 in ratones sediments was found to be as high as 1.42 μg g-1 in itacorubi, which is comparable to other sewage contaminated hydrosystems.
A well-log regression analysis for P-wave velocity prediction in the namorado oil field, Campos basin
Augusto, Fabrício de Oliveira Alves;Martins, Jorge Leonardo;
Revista Brasileira de Geofísica , 2009, DOI: 10.1590/S0102-261X2009000400005
Abstract: geophysical well log measurements are key information for the development of oil and gas reservoirs. however, the absence of a certain fundamental well log, for instance, the compressional-wave (p-wave) sonic log, prevents the application of specific risk-assessment techniques. therefore, the application of methodologies for estimating log records absent in wells is of great importance in the reservoir characterization and development procedures. in this paper, we use the regression analysis methodology for estimating p-wave sonic log measurements. effective porosity, shaliness and electrical resistivity are established, individually or in a combined way, as the parameters for describing p-wave velocity variation in namorado oil field, campos basin. two general equations provide 28 empirical models with potential use in estimating p-wave velocity variation from well log measurements. application of least-squares technique leads to the determination of lithology-related regression coefficients at the surroundings of two wells chosen for verifying the empirical models. the results show the equivalence of both general equations used for obtaining empirical models for p-wave velocity estimation. as confirmation of papers published previously, empirical models assuming effective porosity and/or shaliness as dependence parameters play a fundamental role in the prediction of velocity variation. nevertheless, the velocity calibration process exhibits high stability for empirical models in which electrical resistivity is used as an additional dependence parameter.
An Online mtDNA Tool for Identification of Neotropical Psittacid Species and Taxonomic Issues: A Study Case of the Amazona ochrocephala Complex  [PDF]
Anderson Vieira Chaves, R.O.P. Queiroz-Filho, Fabiano Augusto Assun??o Silva, Cristina Yumi Miyaki, Fabrício Rodrigues dos Santos
Natural Resources (NR) , 2014, DOI: 10.4236/nr.2014.511056
Abstract:
Parrots are among the most popular pets in the world and they are also some of the most illegally traded, particularly in Brazil. Some computational tools were recently developed by researchers based on molecular databases for taxonomy support, forensic identification and conservation purposes. In this study, the DNA Surveillance platform was used to build an online database tool for molecular identification of Brazilian Psittacids using DNA sequences of six mitochondrial genes. To illustrate possible taxonomic issues of the online tool due to interspecific hybridization or unresolved taxonomy, we focused on Amazona aestiva that is considered as one of the most common parrots in Brazil, commonly bred as pets, and considered to be part of a species complex with Amazona ochrocephala from South America. We provide three curated sequence databases, which allow the species identification of individuals or tissue samples of birds of the Psittacidae family using mitochondrial DNA markers, and a comprehensive description of a taxonomic issue involving the A. ochrocephala complex. The results obtained corroborate previous studies suggesting that these species are not reciprocally monophyletic, due to either an ancient hybridization in central Brazil, or, they maybe just are morpho-varieties of the same species. Alternatively, if A. aestiva and A. ochrocephala were considered as sister species, the data could be interpreted either as a result of secondary contact or incipient speciation. Beyond the use of mtDNA for species identification, the high mtDNA haplotype diversity observed in A. aestiva indicates its potential use in discrimination of lineages that could be an important auxiliary tool to certify the captive origin of legally commercialized parrots.
Fun??o pulmonar de obesos mórbidos submetidos à cirurgia bariátrica
Scipioni, Gabriela;Cieslak, Fabrício;Rosário Filho, Nelson Augusto;Leite, Neiva;
Fisioterapia em Movimento , 2011, DOI: 10.1590/S0103-51502011000400005
Abstract: objective: to compare the pulmonary function of individuals morbidly obese submitted to gastroplasty. methods: 25 individuals participated of this research, divided in experimental group with 15 subjects (female = 13 and male = 2) and control group with10 subjects (female = 8 and male = 2). spirometric values were measured in the pre-operative and post-operative phase, three months after surgery. results: there was a significant difference intragroup in the initial analysis after three months follow-up weight, body mass index (bmi), forced vital capacity (fvc), expiratory reserve volume (erv), inspiratory capacity (ic) and the forced expiratory flow (fef25-75%), in individuals who underwent surgery. for the results of the analysis of the differences between the experimental and control groups in the analysis of group and time, it were considered significant fvc and erv. verified that those nonspecific disturbances in the pre-operative and began to have normal lung function in the post-operative phase. there were not significant differences between the characteristics of the proportions of spirometry between groups and the intragroup experimental evaluation. conclusion: bariatric surgery influences in relation to improvement in lung function, observing that a longer follow-up of these individuals can show results in further confirming the importance of weight loss for lung function.
Metaheurísticas híbridas para resolu??o do problema do caixeiro viajante com coleta de prêmios
Chaves, Antonio Augusto;Biajoli, Fabrício Lacerda;Mine, Otávio Massashi;Souza, Marcone Jamilson Freitas;
Produ??o , 2007, DOI: 10.1590/S0103-65132007000200004
Abstract: the prize collecting traveling salesman problem (pctsp) can be associated to a salesman who collects a prize in each city visited and pays a penalty for each city not visited, with travel costs among the cities. the objective is to minimize the sum of the travel costs and penalties, including in the tour enough number of cities that allow collecting a minimum prize. this paper contributes with the development of a hybrid metaheuristic to pctsp, based on grasp and search methods in variable neighborhood (vns/vnd) to solve pctsp approximately. in order to validate the obtained solutions, we proposed a mathematical formulation to be solved by a commercial solver to find the best solution to the problem, being this solver applied to small problems. computational results demonstrate the efficiency of the proposed method, as much in relation to the quality of the obtained final solution as in relation to the time of execution.
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