Navegando por Assunto "Tocantins - Estado"

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Acesso aberto (Open Access)
Caracterização genética de avestruzes (Struthio camelus) usando marcadores RAPD
(Universidade Federal do Pará, 2007-04-02) FERREIRA, Silvaney Fonseca; MARQUES, José Ribamar Felipe; http://lattes.cnpq.br/0104908318773676
The objective of this work was to evaluate the genetic variability of ostrich populations (Struthio camelus) through RAPD markers (Random Amplified Polymorphic DNA). 121 samples of individuals were used from Pará, Maranhão, Tocantins and Minas Gerais States. The genomic DNA was extracted from total blood. Fifteen primers were selected among the 60. The products of the PCR were visualized in agarose gel 1.5% and, a binary matrix was generated considering the presence (1) of a amplified fragment and its absence (0). The ideal number of polymorphic bands was estimated through the bootstrap analysis using the GQMOL software. The genetic similarity was estimated through the Jaccard coefficient using the NTSYS-PC (Numerical Taxonomy and Multivariate Analysis System) software, version 2.02. The origin of the genetic diversity was quantified by the analysis of molecular variance (AMOVA) using the Arlequin 2,0 software. The 15 primers generated a total of 109 polymorphic bands and the bootstrap analysis showed that at least 100 bands is the ideal number for sampling the genetic diversity, as determined by the high value of correlation (r=0,99), the low value of the squared deviation sum (1,25), and the low stress (0,05). The results suggest that the studied populations are from the same origin. Management measures must be adopted in these breeding, even using other molecular markers in the way to amplify the genetic variability and the conservation of this important genetic resource. RAPD.The bootstrap analysis showed that from 100 bands the work already becomes more trustworthy, a time that the magnitude of the correlation was well next to the maximum value (r=0,99), as also the addition of squares of shunting lines (SQd) reached low value 1,25 and the value of it estresse (e) was of 0,05. In the analysis between pairs of groups, it was verified that the greater and minor similarity are in lathe, respectively, of 0,86 and 0,00. In that it says respect to the distribution of frequency of the similarities gotten between the 5,644 pairs formed in the genetic matrix, it can be verified that 32,69 % of the pairs had been enclosed in the classrooms with similarities varying of 0,01 the 0,10. One notices that the biggest percentage (85,59%) of the pairs was distributed in the three first classrooms of the extremities and that the minority of them (14,41%) presented similarities varying of 0,21 the 1,00. The test of Mantel showed correlation of 0,81 and the dendrograma generated 67 groups delimited for the Sm that was of 0,49. The biggest 0,86 similarity was of and the minor of 0,06. The relative data to the analysis of molecular variance had shown that the percentage of genetic variation between origins was low and significant (24,03%, p < 0,0001), evidencing that great part of the variation meets inside of the populations (75,97 %). markers RAPD they had been efficient in the characterization of the genetic similarity.
Acesso aberto (Open Access)
Distribuição de raios, precipitação e casos de tempestades severas na Amazônia Oriental
(Universidade Federal do Pará, 2010) RIBEIRO, Wanda Maria do Nascimento; SOUZA, José Ricardo Santos de; http://lattes.cnpq.br/2797414407717271
The objective of this work was to analyze the relation between lightning and precipitation, over different land surfaces and through case studies of severe storms, during the period of December, 2006 to December 2008. The studies were carried out within an area limited by the geographic coordinates 0°S to 6°S and 47°W to 50°W, which includes parts of the States of Pará and Maranhão, as well as, the northern portion, of Tocantins State, in Brazil. This region was selected for study, due to its location within the core area of the sensor locations of the lightning detection network operated by the Amazonian Protection System (SIPAM-LDN), which covers most of the electric power transmission lines in eastern Amazonia. Rainfall data were collected by 46 digital pluviometers, belonging to meteorological stations of INMET and HIDROWEB-ANA. For the analysis of the days of severe storms, data from a high time resolution pluviometer, operated by CPRM in Belem, were also used. In order to classify the land surface types, in particular the vegetation cover, information from IBGE Natural Resources data library, were used. For more detailed analysis of the relations among lightning, precipitation and land surface types, the studied area was divided in three parts, with different physiographic characteristics. Area 1, including the Marajo Island and a large water surface at the mouth of the Amazon River and nearby Atlantic Ocean. Area 2, which has 60% of its surface covered by forests. Area 3, with 62% of its surface covered by agriculture and/or pasture areas. Large scale meteorological systems which produce lightning and rainfall were taken into account for the analyses over these 3 sub areas, as well as, for the severe storm case studies around Belem. In almost all storms studied, it was observed that the lightning onset of events preceded the intense rainfall. In general, the results showed some seasonally different behaviors of the lightning density of occurrences over these distinct land surface compositions. Nevertheless, this work also showed that, the meteorological conditions have larger influence on the values of this variable than the surface types . This was clearly demonstrated by the case studies of severe storms, when the ZCIT and LI`s proved to be determinant on the precipitation and lightning occurrences observed around Belem.
Acesso aberto (Open Access)
Estratigrafia e geoquímica orgânica da formação Longá, neodevoniano/eocarbonífero da Bacia do Parnaíba, região de Pedro Afonso-To
(Universidade Federal do Pará, 2017-05-30) BRITO, Ailton da Silva; LIMA, Sidney Gonçalo de; http://lattes.cnpq.br/1655930426274093; SOARES, Joelson Lima; http://lattes.cnpq.br/1345968080357131
The Late Devonian is marked by considerable paleoclimatic and paleogeographic changes related to a widespread colonization of the continent by vascular plants, exponential increase of organic production and development of background anoxia in the epeiric seas, typical of that period. In addition, during Famennian age the Gondwana continent was in high latitudes and glacial pulses occurred in South America. A postglacial phase in Late Famennian was responsible for the occurrence of a marine transgression and beginning of the Long Formation sedimentation until the Tournaisian. Devonian-Carboniferous boundary is marked by deposition of black shales in various parts of the world. The goal of this work is a paleoenvironmental reconstruction and a geochemical characterization of the postglacial organic matter deposits of Long Formation from southwest Parnaíba Basin. A lithofaciological analysis was accomplished of Longá deposits plus petrographic and X-ray diffraction. The quantification of Total Organic Carbon (TOC) plus Rock-Eval pyrolysis and biomarkers was the geochemical analysis of organic matter within Longá Shales. From the sedimentological analysis of the deposits five lithofacies was identified: conglomerate lag (Gmm), laminated shales (Fl), coarse sandstone with megaripple bedding (Sm), fine to medium hummocky cross-stratified sandstones (Sh) and wavy-linsen shale interbedding with fine sandstone (Fwl). The lithofacies were interpreted as belonging to a single facies association, representing offshore to shoreface deposits. The lower Longá Formation boundary is well delimited by a transgressive lag produced by waves that separate it from the non-marine deposits of the Cabeças Formation. The formation is characterized by the predominance of thick layers of the Fl and Fwl facies with episodic events of storms and occurrence of debris rain as result of remaining icebergs melting. In Fwl facies occur typical elements of the Cruziana Ichnofacies characterized by predominance of horizontal trace fossils. These characteristics suggest a stressful environment caused by changes in salinity during the input of ice melting water within the platform. The organic geochemistry analyzes showed that Longá shales had a low TOC content, less than 1%, values of free hydrocarbons (S1) below the detection limit of the Rock-Eval 6 equipment, and very low (0.06 to 0.23) hydrocarbons generation potential (S2). The maximum pyrolysis temperature (Tmax) as well as the thermal maturation parameters calculated on the biomarkers show that the Longá shales are immature. The values of pristane/n-C17, phytane/n-C18, Hydrogen Index (IH) and Oxygen Index (IO) suggest kerogen type III and IV, formed from conical land leaves, needles and plant waxes as are support by total sulfur (TS) <0.2 wt%, terrigenous/aquatic ratio (TAR), C29-sterol, hopane/sterane and Methylphenanthrene (MPs). This organic matter was deposited in an epeiric sea where prevailed shallow water, oxidizing conditions, normal salinity, and low temperatures.
Acesso aberto (Open Access)
Estudo petrológico e das mineralizações de granitoides Santa Luzia na região de Paraíso do Tocantins-TO
(Universidade Federal do Pará, 1996-03-24) LAMARÃO, Cláudio Nery; KOTSCHOUBEY, Basile; http://lattes.cnpq.br/0096549701457340
Acesso aberto (Open Access)
Geologia, geocronologia e litoquímica dos granitos paleoproterozóicos do tipo A no setor setentrional da Província Tocantins
(2008-06) CHAVES, César Lisboa; GORAYEB, Paulo Sérgio de Sousa; MOURA, Candido Augusto Veloso
This work presents the geologic characterization of the Ipueiras Intrusive Suite, which comprises four granitic plutons, named do Carmo, Areias, Ipueiras and Itália, located in Goiás Massif, northern sector of the Tocantins Province. New petrographic, litogeochemical, geocronological and isotopic data had allowed to discriminate these plutons of other granites of the region. Lithochemical data showed that they are peraluminous subalkaline granites, with A-type affinity. Single zircon Pb-evaporation data indicate an age of 2,08 Ga for this magmatism. Sm-Nd (TDM) ages between 2,15 and 2,19 Ga, and positive εNd(2,08 Ga) values (+2,5 to +2,9) for the Areias and Ipueiras granites suggest an origin involving juvenile mantle components. This granitogenesis may be related to the last magmatic pulses of the Transamazonian thermotectonic event, well defined in the region.
Acesso aberto (Open Access)
Neotectônica e morfogênese da região de Carolina (Ma, To), bacia do Paranaíba
(Universidade Federal do Pará, 1996-10-05) BEZERRA, Pedro Edson Leal; COSTA, João Batista Sena; http://lattes.cnpq.br/0141806217745286
Acesso aberto (Open Access)
Ocorrência de inibidores de glicosidases em cianobactérias e microalgas dos estados do Amapá e Tocantins
(Universidade Federal do Pará, 2015-08-13) SILVA, Vivian Cassia Oliveira da; XAVIER, Luciana Pereira; http://lattes.cnpq.br/6207860145204571
Cyanobacteria are presented as a new source of secondary metabolites for the production of bio-products in many industrial sectors and are used primarily because of its easy cultivation, using few nutritional sources, as well as a large biomass production. Until now we don't have many report in literature of cyanobacteria from amazon, as well as their metabolites and their use in bioproducts. Glycosidases are enzymes of extreme importance as targets for developing drugs that are used for the treatment of various diseases, as well as their inhibitors. This study aimed to identify 24 samples of cyanobacteria and microalgae from the states of Tocantins and Amapá, isolates that produce these inhibitors, as well as extract, fractionate and identify them. Initially, the detection test in petri dishes with esculin the substrate for glycosidase inhibitors has been standardized and the extraction methodology. As a result there was glucosidase inhibitory activity of crude extract and the methanol fraction of four samples (Synechococcus sp, Monoraphydium, P29 and Limnotrix sp), inhibitory activity was detected in the aqueous fractions of any culture. Two methanolic fractions that showed activity was selected for potential assay conducting inhibiting α-glycosidase face with the substrate p-nitrophenyl α-D-glucopyranoside and β-glucosidase to the substrate p-nitrophenyl β-D-glucopyranoside, where both samples had a higher percentage of inhibition for α-glucosidase compared to β-glucosidase.
Acesso aberto (Open Access)
A Pedagogia da alternância na visão dos egressos da EFA de Porto Nacional - TO: a possibilidade de uma formação integral
(Universidade Federal do Pará, 2009-08-27) CAVALCANTE, Nilton Vale; OLIVEIRA, Ney Cristina Monteiro de; http://lattes.cnpq.br/4355112931326342
In this study it was analized how the Integral Formation of young people, one of the main purposes of the network Centros Familiares de Formação por Alternância (Familiar Centers of Alternation Formation), has been happening at Escola Família Agrícola (Agricultural Family School), in the city of Porto Nacional, and how occurs the participation of its egresses in the different aspects of social life. The research is based on the qualitative approach with dialectical perpective, that here has the form of case study. We combined the use of bibliographic research with other methodological procedures, such as documentary research from which it was analysed, among other situations, the Political and Pedagogical Project of the Agricultural Family School, reports, Education Laws and opinions. We still applied semistructuralized type interviews, with 14 chosen egresses, after applying a questionnaire answered by 32 of the 103 total students that had finished the High School and Professional Education at the Agricultural Family School, until the year of 2006. At the main documents of that School, it was clear the assumption that it can contribute with the Integral Formation of its young people, by trainning them for the citizenship and building a culture of participation. The Country Education, in Brazil history, is a concrete example of indifference and refuse of a right by the Brazilian State, from what is responsability of public policies to include the country population. It is in this empty of denying people their rigths, not only done by the State, but also and mainly by the powerful social elites of Brazil, that it is born, within the civil society of Porto Nacional, the Agricultural Family School, helping country people of that region. The Agricultural Family School was created by COMSAÚDE, a nongovernmental organization, and it came from debates with country comunities of Porto Nacional and local Social Movements. One of the purposes to the creation of the School is to help people that live at the country region, giving them a quality education and reflecting the particularities of that population, working with the Familiar Agriculture. The research concluded that the Scool advances by working knowledge from reading people reality, in the light of other knowledges and possibilities and that the School contributes to form citizens at the Integral Formation of its young people.
Acesso aberto (Open Access)
Proveniência das rochas metassedimentares do Cinturão Araguaia com base em datações Pb-Pb em zircão e idades-modelo Sm-Nd
(2011-06) PINHEIRO, Bruno Luís Silva; MOURA, Candido Augusto Veloso; GORAYEB, Paulo Sérgio de Sousa
This paper presents single zircon Pb-evaporation ages, obtained in detrital zircon grains, and Sm-Nd (TDM) for metassedimentary rocks of the Araguaia belt, to investigate the possible source areas of these rocks, and to contribute to understanding the geologic evolution of this belt in the context of the West Gondwana amalgamation. Quartzite of the Morro do Campo Formation, located in the north segment of the belt (Xambioá region) gave Archean 207Pb/206Pb zircon ages (2.65-3.0 Ga), while in the south segment (Paraíso do Tocantins region), the 207Pb/206Pb zircon ages were mainly Meso-Neoproterozoic (1.25-0.85 Ga), and, secondarily, Paleoproterozoic (1.85-1.70 Ga). These results suggest the existence of different sources areas for this quartzite. The Sm-Nd (TDM) model ages of metapelites (slate, phyllite and micaschist) present bimodal distribution with the main population occurring between 2.1 and 1.4 Ga (mode in 1.6-1.7 Ga), and a less abundant population between 2.7 and 2.4 Ga. These data have been interpreted as mixing of Paleoproterozoic (or even Archean) sources with younger, probably Meso-Neoproterozoic, sources. The main candidates to be the sources of the metassedimentary rocks of the Araguaia belt would be those crustal segments located in the southeastern (São Francisco Craton, Goiás Massif, Goiás Magmatic Arc). The sedimentary succession deposited in the Araguaia oceanic basin and the associated magmatic rocks were transported, later, towards the east margin of the Amazonian Craton, during the main tectonic that led to the structural development of the Araguaia belt as a result of the West Gondwana amalgamation.
Acesso aberto (Open Access)
Região, regionalização e rede política: um estudo sobre a atuação da Associação dos Municípios do Araguaia-Tocantins (AMAT)
(Universidade Federal do Pará, 2006-12-01) RODRIGUES, Marcos Mascarenhas Barbosa; SILVA, João Márcio Palheta da; http://lattes.cnpq.br/5356047514671129
The discussion on region intends to let subsidies to understand the territorial dynamics ones in Brazil and his implications at regional level having like his principal agent of a new proposal of regionalization for the Para to Association of the Municipal districts of the Araguaia-Tocantins (AMAT). Whose implication turns in the new forms of conceiving the region and sweats form of practice methodological, the regionalization, being used in this work while instrument for confirmed that hypothesis. Having how problematic: In which measure is it possible to bring into effect a regionalization of the state of the Para, from the arrangements partner-politician with which they are established representative, from the actions of the AMAT? What took the political net constituted by the AMAT in the south-east of the Para to be differentiated and to consolidate in the form to have distinction in the State? Does the establishment of the political nets have the capacity of incorporating the territorial dimension in the execution of his strategies to think and to manage a regional project near the informing local authorities, consequently improving the municipal acting? Having like central hypothesis, that the process of concentration of the political net in the south-east of the Para is responsible it shears insurgence of process of new sub-regionalization like that we see with the proposal of creation of a new state, with the dismemberment of the big-region of the south-east from Para. The methodology way by it through the historical reconstitution of the territorial transformations, with sights to understand the new regionalization, from a vision of totality of which our cutting out makes part and suffers criticism, using interviews, secondary inquiry and bibliographical study.
Acesso aberto (Open Access)
Sistema Xerente de Educação matemática: negociações entre práticas socioculturais e comunidades de prática
(Universidade Federal do Pará, 2016-08-23) MELO, Elisângela Aparecida Pereira de; MENDES, Iran Abreu; http://lattes.cnpq.br/4490674057492872; GONÇALVES, Tadeu Oliver; http://lattes.cnpq.br/6789250569319668
When considering the complexity that involves the formation of indigenous teachers and the teaching of Mathematics in indigenous schools, especially in relation to the interconnections of socio-cultural practices to educational and training activities, which was researched in this work, in which ways can we take the experiences from the socio-interactive activities of the Xerente indigenous peoples as a base for actions to teachers who teach Mathematics in communities of practice. The question that guided this research was, in what sense the socio-interactive activities, experienced by the Xerente indigenous peoples in communities of practice, can mobilize training activities within the discipline of Mathematics for teachers who teach Mathematics at an indigenous school. Hereby, we used the ethnographic qualitative type of research for the collection of information in two villages of Porteira settlement (Nrõzawi e Salto–Kripre) about socio-cultural practices affiliations of Xerente indigenous peoples in exogamous patrilineal halves Doi and Wahirê, and male belonging in the parties of big logs of painted buriti –ĩsitro–Htâmhã and Stêromkwa. The theoretical approaches taken in this research were the communities of practice, within the discipline of Mathematics and Ethno-Mathematics, as they propitiate a rereading of these cultural practices within a view that triggers further actions in and for the training of teachers, starting from the negotiation of the meanings of cultural practices of these indigenous. The results obtained throughout the analysis indicate that the Xerente indigenous communities, in their socio-cultural practices, share a sort of joint venture, a mutual commitment and a shared repertoire in order to constitute themselves as communities of practice. Therefore, Srêmtôwẽ indigenous school goes, in their didactic and pedagogical actions, in the direction of forming communities of practice from the collective collaboration of socio-cultural practices that contribute to the creation and recreation of new Mathematics learning.
Acesso aberto (Open Access)
Viabilidade da aplicação do GPR para o mapeamento de camadas de bauxita laterítica e de goethita
(2012-06) DUARTE, Gildenilson Mendes; LUIZ, José Gouvêa; SILVA, Marcos Welby Correa; MAURITY, Clóvis Wagner
The GPR electromagnetic method was tested in the mapping of layered mineral deposits, located in two different geological environments. Measurements were made with the aim of mapping layers that form the deposits of supergene origin of lateritic bauxite and goethite. The surveys for the mapping of the bauxite layers were conducted in the municipality of Paragominas, in Pará State. The measurements for mapping the goethite layers were carried out inside a private property, which is located between the towns of Xambioá and Vanderlândia, Tocantins State, near the Araguaia Belt. The study had as main objective to identify the parameters depth and thickness of the mineralized zones, which may help in the work of exploitation of the ores. The obtained results can be considered as very satisfactory, because the method presented a good response for both types of ores investigated, making possible the characterization of the layers and the verification of their depths and thicknesses.