64 research outputs found
Cultivation-independent methods applied to the microbial prospection of oil and gas in soil from a sedimentary basin in Brazil
The upper parts of oil field structures may leak gas which is supposed to be indirectly detected by the soil bacterial populations. Such microorganisms are capable of consuming this gas, supporting the Microbial Prospection of Oil and Gas (MPOG) methodology. The goal of the present work was to characterize microbial communities involved in short-chain alkane metabolism, namely methane, ethane and propane, in samples from a petroliferous (P) soil through clone libraries of the 16S rRNA gene of the Domains Bacteria and Archaea and the catabolic gene coding for the soluble di-iron monooxygenase (SDIMO) enzyme alpha subunit. The microbial community presented high abundance of the bacterial phylum Actinobacteria, which represented 53% of total clones, and the Crenarchaeota group I.1b from the Archaea Domain. The analysis of the catabolic genes revealed the occurrence of seven Operational Protein Families (OPF) and higher richness (Chao = 7; Ace = 7.5) and diversity (Shannon = 1.09) in P soil when compared with a non-petroliferous (Np) soil (Chao = 2; Ace = 0, Shannon = 0.44). Clones related to the ethene monooxygenase (EtnC) and methane monooxygenase (MmoX) coding genes occurred only in P soil, which also presented higher levels of methane and lower levels of ethane and propane, revealed by short-chain hydrocarbon measures. Real-time PCR results suggested that the SDIMO genes occur in very low abundance in the soil samples under study. Further investigations on SDIMOs genes in natural environments are necessary to unravel their still uncharted diversity and to provide reliable tools for the prospection of degrading populations
O Boletim Médico: prescrição dos tisiólogos para a cura da cidade de São José dos Campos (1930-1935)
Evaluating the best time to intervene acute liver failure in rat models induced by d-galactosamine
Interação entre fungos micorrĂzicos arbusculares e bactĂ©rias diazotrĂłficas em trigo
Hair fiber characteristics and methods to evaluate hair physical and mechanical properties
Incidence and main causes of severe maternal morbidity in SĂŁo LuĂs, MaranhĂŁo, Brazil: a longitudinal study
ExpressĂŁo diferencial de proteĂnas do fungo Conidiobolus lamprauges cultivado em diferentes temperaturas
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