Avaliação de sementes de milheto no cultivo de Trichoderma spp.

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Endophytic bacterium isolated of hosts present in contaminated areas by mercury in Pantanal mato-grossense.

The mercury is a contaminant in gold mining in the city of Poconé. This heavy metal is a toxic in different organisms and affect the human by bioaccumulation process causing a serie of cronic diseases. Mercury can be easily absorbed by plants and be accumulated in the human body through the food chain. The hypothesis is microorganism that is in association with plants, that survive in contaminated areas with mercury, provide greater resistance to contaminant and possibly an increased frequency of colonization. In this way, the aim of this study was to isolate endophytic bacterium that exhibit resistance to mercury

Isolation of endophytic fungi in environments with and without traces of mercury contamination, Pantanal of Mato Grosso.

The mining activity in Mato Grosso is an economic source for many cities, especially in Poconé, where this activity is responsible for significant change in the landscape and the contamination of the ecosystem by mercury. This results in serious damage to biota enhanced by bioaccumulation capacity. Mercury is toxic to all organisms, however, some microorganisms have innate or acquired tolerance to metal. Therefore, our hypothesis is based on the premise that plants in contaminated environments with mercury harbor a specific community of endophytic fungi, therefore, variations in the colonization frequency of the endophytes in these plants are expected, when compared to places without contamination

Capacity resistance of endophytic fungi the mercury.

Contamination of biological systems by mercury represents a global concern, given the difficulty of degradation, persistence and potential toxicity of this metal in the environment. Remediation strategies of soils contaminated with mercury are required and the use of microorganisms as bioremediation agents is fully justified, in particular, the various mechanisms of tolerance to heavy metals allocated to them, particularly for fungi arising from various chemical processes, such as transformation valence, intra and extracellular precipitation and oxidation. Our hypothesis is that endophytic fungi isolated from areas contaminated by mercury present higher resistance to this metal

Distribuição espacial do teor de magnésio (Mg) em solo sob floresta nativa com presença da castanha-da-amazônia (Bertholletia excelsa Bonpl.) na Amazônia Oriental.

O objetivo foi estudar a distribuição espacial do magnésio em solo com presença da castanha-da-amazônia.Resumo 2831