921 resultados para Mata-pasto


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The microorganisms play very important roles in maintaining ecosystems, which explains the enormous interest in understanding the relationship between these organisms as well as between them and the environment. It is estimated that the total number of prokaryotic cells on Earth is between 4 and 6 x 1030, constituting an enormous biological and genetic pool to be explored. Although currently only 1% of all this wealth can be cultivated by standard laboratory techniques, metagenomic tools allow access to the genomic potential of environmental samples in a independent culture manner, and in combination with third generation sequencing technologies, the samples coverage become even greater. Soils, in particular, are the major reservoirs of this diversity, and many important environments around us, as the Brazilian biomes Caatinga and Atlantic Forest, are poorly studied. Thus, the genetic material from environmental soil samples of Caatinga and Atlantic Forest biomes were extracted by direct techniques, pyrosequenced, and the sequences generated were analyzed by bioinformatics programs (MEGAN MG-RAST and WEBCarma). Taxonomic comparative profiles of the samples showed that the phyla Proteobacteria, Actinobacteria, Acidobacteria and Planctomycetes were the most representative. In addition, fungi of the phylum Ascomycota were identified predominantly in the soil sample from the Atlantic Forest. Metabolic profiles showed that despite the existence of environmental differences, sequences from both samples were similarly placed in the various functional subsystems, indicating no specific habitat functions. This work, a pioneer in taxonomic and metabolic comparative analysis of soil samples from Brazilian biomes, contributes to the knowledge of these complex environmental systems, so far little explored

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Dissertação (mestrado)—Universidade de Brasília, Departamento de Engenharia Florestal, Programa de Pós-Graduação em Ciências Florestasi, 2015.

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Tesis (Maestría en Estudios y Gestión del Desarrollo).-- Universidad de La Salle. Maestría en Estudios y Gestión del Desarrollo, 2013

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Tesis (Zootecnista). -- Universidad de La Salle. Facultad de Ciencias Agropecuarias. Programa de Zootecnia, 2013

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Tesis (Zootecnista). -- Universidad de La Salle. Facultad de Ciencias Agropecuarias. Programa de Zootecnia, 2014

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The knowledge on the Podzols which occur in Portugal is scarce. Besides its morphological characterization, their actual extension and distribution are unknown, and its taxonomy is controversial. Therefore, 22 pedons formed under conditions considered representative of those in which Podzols mostly occur in the country were selected in the Mata Nacional de Leiria, and their morphological, physical, chemical and mineralogical characteristics were studied. Soils developed in such conditions are both Podzols and Arenossolos sensu WRB 2006, but the latter are clearly predominant. The Podzols frequently show thick albic horizons and incipient spodic horizons; the latter are dusky, but show organic matter (OM) contents close the minimum threshold considered as diagnostic criteria for spodic horizons, and low content in Al and Fe. A wide spectrum of characteristics is observed in the Arenosols. Some of them present profils with morphology close to that of the Podzols, but with a low illuvial acumulationb of OM (and Fe e Al components), and the others (the predominant Arenosols in the study area) do not present intergrade characteristics, although they can show expressed albic horizons. The former Arenosols correspond to intergrades of Podzols which are not satisfactorily fit into the recent WRB versions. The characteristics of Podzols are strongly dependent on the low weatherability and high permeability of the lithological substrate (non consolidated quartzeous sediments)

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Dissertação de Mestrado, Arquitetura Paisagista, Faculdade de Ciências e Tecnologia, Universidade do Algarve, 2016

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Como lectora, por segunda vez, de una de las novelas de María Bonilla tengo la oportunidad de compartir con los lectores de esta revista algunas reflexiones sobre mi lectura de su novela La actriz. ¿Qué es este cuadro dentro del cuadro, que nos introduce al libro mediante las paradojas del autoretrato? Una cierta manera de narrarse a sí misma, una autoficción que tiene como matriz de discurso la relación de esa autora consigo misma: una María Bonilla real con otra autora que narra su relación con una mujer de 41 o 42 años y que nos contará su íntima relación con el personaje de la reina de las hadas, Titania, de la obra de Shakespeare, El sueño de una noche de verano, escrita en 1596.

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Fondo Margaritainés Restrepo

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Fondo Margaritainés Restrepo

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Bogotá (Colombia): Universidad de La Salle. Facultad de Ciencias Agropecuarias. Programa de Zootecnia

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Tese (doutorado)—Universidade de Brasília, Centro de Desenvolvimento Sustentável, 2015.

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Ectomycorrhizal associations are poorly known from tropical lowlands of South America. Recent field trips to the reserve Parque Estadual das Dunas in Natal, in Rio Grande do Norte state, Brazil, revealed a undocumented community of ectomycorrhizal fungi. This type of Mycorrhizal association is frequently in the north hemisphere in temperate and boreal forests. The aim of this work is to analyze the occurrence of ectotrophic areas in atlantic rainforest. Collections along and around the trails in the reserve revealed six genera of putatively ECM fungi which belong to the basidiomycete, Amanitaceae, Boletaceae, Russulaceae, Entolomataceae, and Sclerodermataceae family which are poorly documented in Brazil. Plants belonging to Myrtaceae, Polygonaceae, Leguminosae/Caesalpinioideae, Erythroxylaceae, Malphigiaceae, Bromeliaceae, Loganiaceae, Sapotaceae e Celastraceae were found living next to the species of fungi analized. Our results suggest that the area studied is an ectotrophic environment which shows high diversity of putatively ECM fungi and some plants probably host ECM. The tropical lands are a potential focus to study reinforced by the new records of Scleroderma in Brazil and Northwest of Brazil

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A taxonomic survey of representatives of the genus Geastrum took place during the rainy season from 2006 to 2009 in four districts in the state of Rio Grande do Norte: Parque Estadual Dunas do Natal (Atlantic Forest), Mata do Jiqui EMPARN (Atlantic Forest) and Estação Ecológica do Seridó (Caatinga). Fourteen species were recorded: G. entomophilum, G. fimbriatum, G. hirsutum, G. javanicum, G. lageniforme, G. lloydianum, G. minimum, G. morganii, G. ovalisporum, G. pectinatum, G. saccatum, G. schweinitzii, G. setiferum and G. triplex. Of these species, eleven occurred in the Atlantic Forest and six in the Caatinga. A new species has been recorded to science, G. entomophilum, other as a first record for Brazil, G. morganii, six new records for the Northeast, and ten new records for Rio Grande do Norte. The material was tumbled in the Herbarium UFRN. Additionally, a survey of the species of the genus deposited in the Herbarium UFRN was accomplished, resulting in 244 herbarium specimens belonging to thirty-three species. Of these ones, twenty-three were collected in Brazil and ten are from Czech Republic, Europe, as donation from the VZ Herbarium