973 resultados para Universidade Federal de Minas Gerais Departamento de Psicologia História
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Ps-graduao em Servio Social - FCHS
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A regio de So Thom das Letras constitui o maior centro brasileiro de lavra de quartzitos foliados, com produo atual estimada em 250.000 t/ano. O baixo ndice de recuperao decorrente das atividades de lavra destes quartzitos, estimada como inferiores a 20% do total extrado, estariam gerando cerca de 1.250.000 t/ano de rejeitos, o que tem se traduzido em grandes pilhas de bota-fora com evidentes desdobramentos ambientais indesejveis. Objetivando a adequao ambiental da lavra, a Fundao Estadual do Meio Ambiente de Minas Gerais - FEAM iniciou, a partir do ano de 1993, trabalhos de fiscalizao e orientao da atividade extrativa de quartzitos no Municpio de So Thom das Letras. A partir de 1996, esses trabalhos foram ampliados atravs do Projeto Minas Ambiente - Minerao de Pedra So Tom que, sob a coordenao da FEAM, promoveu estudos para disposio controlada e aproveitamento econmico de resduos, revegetao das pilhas de bota-fora e tcnicas menos impactantes de desmonte na lavra. Neste contexto, os estudos geolgicos, petrogrficos e qumicos ora realizados visam contribuir com aspectos de interesse para as atividades extrativas e de aproveitamento industrial dos rejeitos da lavra e do beneficiamento dos quartzitos foliados So Tom. Trabalhos desenvolvidos no mbito do Projeto Minas Ambiente e, mais recentemente, pela Universidade Vale do Rio Verde de Trs Coraes demonstraram a viabilidade tcnica de utilizao dos quartzitos para elaborao de tijolos prensados e autoclavados. Algumas variedades de quartzitos tambm esto sendo aproveitadas na produo de vidrados e esmaltes cermicos, inclusive com vantagens tcnicas e econmicas bastante competitivas sobre matrias-primas oriundas de sedimentos aluvionares. Outros usos para os quartzitos modos, como carga mineral, material filtrante e argamassas em geral, esto em fase de estudos pelos mineradores e devero ser brevemente viabilizados, o que permite vislumbrar, pelo menos a mdio prazo, um expressivo incremento dos usos industriais para os quartzitos So Tom. Palavras-chave: rocha ornamental; rocha de revestimento; quartzito laminado; recuperao de rejeito; quartzito So Tom.
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Centenas de intruses alcalino-ultrabsicas ocorrem na regio sul-sudoeste de Minas Gerais. Duas destas intruses, portadoras de diamantes e conhecidas como Canastra-1 e Abel Rgis, foram estudadas em detalhe visando seus aspectos geolgicos, geoqumicos e mineralgicos. A segunda foi ainda objeto de datao LA-MC-ICP-MS em zirco. Em termos geolgicos, tais intruses exibem diferenas morfolgicas significantes: a forma superficial do Canastra-1 irregular e de pequena dimenso (150 m de comprimento maior), enquanto o Abel Rgis circular e de grande dimetro (~1,4 km), as quais representam, respectivamente, fcies de raiz e de cratera. A geoqumica dessas intruses apresentou caractersticas peculiares, principalmente quanto aos lcalis: o pipe Canastra-1 empobrecido em Na2O e K2O, xidos que possuem contedos significantes no pipe Abel Rgis, este datado em 86,1 4,5Ma. Os aspectos mineralgicos das fases indicadoras de diamantes tambm so bastante distintos: a abundncia em Cr-espinlio, bem como a presena de sanidina e a qumica mineral de ilmenita e diopsdio, so indicadores de uma possvel tendncia lamprotica para o pipe Abel Rgis, enquanto o Canastra-1 possui aspectos geoqumicos e mineralgicos de um kimberlito clssico.
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Coordenao de Aperfeioamento de Pessoal de Nvel Superior (CAPES)
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Ps-graduao em Biocincias e Biotecnologia Aplicadas Farmcia - FCFAR
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The occurence of carbonatic rocks defines a typical type of relief, called karst, that, by its geomorphology and hydrology, usually differs from the surrounding landscape. In the upper So Francisco river basin, some striking remnants of vegetation associated to karst can be found, which are locally knwon as Mata de Pains. In this region, a mosaic of different physiognomies, including forests and open areas, which present noteworthy plant diversity, composes the vegetation. The aim of this study is to provide an inventory of angiosperm species in areas of carbonatic rocks outcrops in the upper So Francisco river basin karst region, as well as analyze the floristic relationship of the study area with different Brazilian phytogeographic domains. Fieldwork was performed during the period of 2002 a 2006, when collections of fertile speciemns were done in areas associated to carbonatic rock outcrops. During the study, 1512 exsicates were incorporated to BHCB herbarium collection. A total of 456 angiosperm species were inventoried, distributed in 299 genera and 77 families. Herbaceous habit was better represented, with 161 species, followed by shrubs and trees (111 species each) and lianas (73 species). The flora of the study area presents more influence of the Mata Atlntica domain (Atlantic Rain Forest), followed by, in order of importance, Cerrado, Amazonia, Caatinga, Pantanal and Pampa. Floristic surveys in different karst regions inserted in different phytogeographic domains may, together, provide useful information in understanding the phytogeografic history of Neotropical vegetation.
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This study describes the richness of Leguminosae used by 21 traditional farmers in coffee agroforestry systems (AFS) and forest fragments of the Atlantic Forest, in the municipality of Araponga, Minas Gerais, Brazil. It also presents the use categories, relative importance and the species similarity between the AFSs. Data were collected through semi-structured interviews and participant observation, between August 2005 and November 2006, directed during random walks in seven AFSs and forest fragments surrounding the State Park of Serra do Brigadeiro. The farmers cited 59 species of Leguminosae, of which 86% are native to the Atlantic Forest and used in ancient cultural practices, such as to make bullock carts. Twelve categories of use were established, among them the most important were fertilizer and firewood (21 spp each); in the AFSs, species used for soil fertilization (18 spp) are the most utilized, and in the forest, the species for firewood and technology (17 spp.) The relative importance index showed that in the forest, Piptadenia gonoacantha showed 83% of agreement for the use as wood for fencing pastures, while in the AFSs, Inga edulis scored 100% as food. The AFSs studied show little similarity of species (0.42 of the Sorensen scale), due to the selection promoted by the farmers, thus, providing room for the conservation of useful species of Leguminosae.
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Fundao de Amparo Pesquisa do Estado de So Paulo (FAPESP)
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This study aimed to identify the Hemerobiidae (Neuroptera) associated to Brazilian savannah and gallery forest, in Minas Gerais State, Brazil. The sampling was carried every two weeks at Brazilian savannah (Cerrado) in Divinopolis and at gallery forest in Pedra do Indaia, both in Minas Gerais State, Brazil. Collecting was carried out between November 2003 and October 2004, with Malaise traps. A total of 181 specimens of five species of Hemerobiidae were collected. The species Nusalala tessellata, Megalomus impudicus, Hemerobius bolivari and Notiobiella sp. were collected in the two sites; the fifth species Sympherobius sp. was found only in Pedra do Indaia. The species of diversity (index of Shannon-Wiener) and the equitability (J) of Hemerobiidae were similar in the areas of Brazilian savannah and gallery forest (H'=0.47-0.49, respectively, and J=0.78-0.69, respectively), and the differences observed between the two locations were not significant.
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Fundao de Amparo Pesquisa do Estado de So Paulo (FAPESP)
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Fundao de Amparo Pesquisa do Estado de So Paulo (FAPESP)
