Purpose: Understanding the dynamics of mycorrhizal fungi in the Cerrado is fundamental for the adoption of conservation practices and for understanding the resilience of this biome in relation to long periods of drought. Thus, this work aimed to verify the dynamics of the mycorrhizal population in five phytophysiognomies of the Cerrado biome. Methods: The samples were taken from the Chapada dos Veadeiros National Park, a permanent preservation with native Cerrado vegetation without any anthropic influence. The five main phytophysiognomies of the Cerrado biome were chosen: the Campo Limpo, Campo Sujo, Cerrado Strictu Sensu, Cerradão, and Veredas. Rhizospherical soil samples were collected in both the wet and dry seasons. Spore density, mycorrhizal colonization rate, easily extractable glomalin, and associated mycorrhizal fungi genera were identified. Results: The values of spore density, mycorrhizal colonization rate, and glomalin were higher in the samples performed during the dry season compared to the samples performed in the rainy season. The same behavior was observed when comparing the different phytophysionomies. Conclusion: Mycorrhizal activity is higher in dry periods when compared to rainy periods. There is no specificity of genera of arbuscular mycorrhizal fungi within the Cerrado phytophysiognomies.

Flavonoids are highly bioactive compounds with very low toxicity, which makes them attractive starting points in drug discovery. This study aims to provide information on plant species containing flavonoids, which are found in the Brazilian Cerrado. First, we present the characterization and plant diversity with emphasis on the families of flavonoid-producing plants, and then we describe the phenylpropanoid pathway which represents the flavonoids’ main route biosynthesis—generally conserved in all species. Chemical structures and biological activities of flavonoids isolated from the Cerrado’s plant species are also described based on examples from the relevant literature studies. Finally, research on the biodiversity of the Cerrado biome should be encouraged, due to the discovery of new sources of flavonoids which can provide several benefits to human health and the possibility of developing new drugs by the pharmaceutical industry.

This article’s objective is to present, via bibliographic research, the territorial makeup of colonial Brazil (1500-1822) and the Brazilian historical approach at the beginning of the twentieth century that sought to relate questions and concepts of frontier, territoriality, and nature in the historic role of the bandeirante movement. The goal here is to address territorial and geographic questions, but also environmental ones, based on historical geography, and to present arguments that fall in the nexus between history and nature in the debate on Brazilian territorial expansion. The text is grounded in classical works, and works by renown authors on this topic, but we also include discussion of less well known sources. The intent is to identify how the theme of bandeirantes and Brazilian westward expansion can be analyzed differently in the pertinent specialized historical literature.

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Sugarcane is a very important economic crop that relies heavily on agricultural machinery, which contributes to soil compaction and a consequent decline in productivity. Subsoiling operation reduces the problems caused by compression; however, it is necessary to know its location and intensity. Accordingly, the aim of this work is to present a compression diagnostic method based on soil resistance to penetration as the parameter that indicates need for intervention in the subsoil. Measurements of penetration resistance was carried out in areas of sugarcane, located in the municipalities of Goianésia, Barro Alto and Santa Isabel, in the Brazilian state of Goiás. The Falker penetrometer (PLG 1020) was used, adjusted to a maximum depth of 40 cm and adopted as a critical resistance value of 4.0 MPa. The data were interpolated using kriging and adjusted in AutoCAD 2013 (Autodesk). The methodology proved effective in areas of compacted soil, and the surface layer had less resistance. The reduction in soil preparation was 96.54% and when considering the topographic adjustments, the reduction was 74.07%, showing the viability and importance of the diagnosis to show the proper management.

Esta nota científica visa apresentar o projeto de pesquisa em andamento resultante da parceria e cooperação interinstitucional dos docentes dos Programas de Pós-Graduação em Geografia, da Universidade Estadual Paulista “Júlio Mesquita Filho” – Campus Presidente Prudente (PPGG/UNESP); em Sociedade, Tecnologia e Meio Ambiente do Centro Universitário de Anápolis (PPSTMA/UniEVANGÉLICA); e em Desenvolvimento Sustentável da Universidade de Brasília (CDS/UnB) de acordo com os objetivos do Programa Nacional de Cooperação Acadêmica (PROCAD), Edital Capes Nº 71/2013. A nota apresenta os principais objetivos e as orientações metodológicas para o estudo da microrregião de Ceres, Goiás, a partir da investigação dos efeitos socioambientais decorrentes da expansão agrícola a partir das décadas de 1940...Palavras chave: Microrregião de Ceres; Fronteira; Meio Ambiente; Recursos Naturais

This article presents an overview of the environmental history of the Brazilian Cerrado, its environmental characteristics and the processes related to the historical change in the landscapes of this endangered ecosystem. It highlights competing classifications of the Cerrado, the role of politics in establishing them, and the environmental consequences of such classifications. More than just describing an environment, classifying an ecosystem is a political process that involves complex socio-environmental interactions. The sources used points out the different attempts to get to know and "conquered" the Cerrado, bringing together interdisciplinary perspectives from a variety of actors and institutions. Historiographic challenges go beyond environmental descriptions in that the socio-environmental interactions that made up this unique ecosystem are equally complex. This paper’s conclusions reinforce the interdisciplinary role of environmental history in the study of ecosystems and the complex relationship between culture and nature.

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