Rhizospheric Effect on the diversity of Archaea in Amazonian Dark Earth.

The objective of this work was to evaluate the rhizospheric effect of legumes on the Archean's diversity in Amazonian Dark Earth

Functional diversity of bacterial genes associated with aromatic hydrocarbon degradation in anthropogenic dark earth of Amazonia.

The objective of this work was to evaluate the catabolic gene diversity for the bacterial degradation of aromatic hydrocarbons in anthropogenic dark earth of Amazonia (ADE) and their biochar (BC). Functional diversity analyses in ADE soils can provide information on how adaptive microorganisms may influence the fertility of soils and what is their involvement in biogeochemical cycles. For this, clone libraries containing the gene encoding for the alpha subunit of aromatic ring-hydroxylating dioxygenases (a-ARHD bacterial gene) were constructed, totaling 800 clones. These libraries were prepared from samples of an ADE soil under two different land uses, located at the Caldeirão Experimental Station - secondary forest (SF) and agriculture (AG) -, and the biochar (SF_BC and AG_BC, respectively). Heterogeneity estimates indicated greater diversity in BC libraries; and Venn diagrams showed more unique operational protein clusters (OPC) in the SF_BC library than the ADE soil, which indicates that specific metabolic processes may occur in biochar. Phylogenetic analysis showed unidentified dioxygenases in ADE soils. Libraries containing functional gene encoding for the alpha subunit of the aromatic ring-hydroxylating dioxygenases (ARHD) gene from biochar show higher diversity indices than those of ADE under secondary forest and agriculture

Influência da cobertura vegetal nas estruturas de comunidades bacterianas em solos de terra preta de índio na Amazônia Central.

Levando-se em consideração a complexa dinâmica da solução do solo e dúvidas ainda existentes sobre a formação das TPIs, este estudo teve como objetivo investigar a influência da cobertura vegetal nas estruturas de comunidades bacterianas em solos de TPI e adjacente por meio da técnica molecular T-RFLP

The development and application of liquid chromatography -mass spectrometry methods for the detection and control of veterinary drug residues

SIGLEAvailable from British Library Document Supply Centre-DSC:DXN031247 / BLDSC - British Library Document Supply CentreGBUnited Kingdo