Identificação e caracterização de Bacillus licheniformis e Geobacillus stearothermophilus. Produção de biossurfactante e degradação de dibenzotiofeno (dbt) por uma nova amostra de Geobacillus stearothermophilus UCP 986

by de França, Mabel Calina

Abstract (Summary)
The strains belonging the Bacillaceae family had been isolated from soil, of contaminated area of petroleum in the Porto of Recife, effluents, and sludge of textile industry. The were identified 26 strains as Bacillus licheniformis and 02 strains as Geobacillus stearothermophilus, presenting similarity to some morphophysiologics and biochemical characteristics, such as: growth in different temperatures and sodium chloride concentrations; use of the citrate; reduction of nitrate to nitrite; fermentation of sugars; position of the endospores; production of amylase, oxidase and catalase; hemolyse and susceptibility to antibiotics. The strain G. stearothermophilus showed biotechnological characteristics such as: thermophilic and halophilic; beyond an excellent capacity biosurfactant production; stability inadverse conditions of pH, temperature, and high salinity, and demonstrating reduction of the superficial tension. The dibenzotiophene (DBT), organosulfur composition in fuels as oil diesel and lubrificants, had been analyzed your processof degradation by G.stearothermophilus. It was observed that, G. stearothermophilus was capable to 77% degradated the dibenzotiophene, breaking linking carboncarbon, removal the sulphur atom, transforming into aliphatics compounds of easy degradation in the environment. The new isolated of G. stearothermophilus UCP 986 showed important characteristics in adverse conditions, demonstrating to be able an excellent candidate in treatments "in situ" in the processes of improvement on the oil recovery (MEOR) in refineries
This document abstract is also available in Portuguese.
Bibliographical Information:

Advisor:Galba Maria de Campos Takaki

School:Universidade Federal de Pernambuco

School Location:Brazil

Source Type:Master's Thesis

Keywords:Geobacillus stearothermophilus Bacillus licheniformis


Date of Publication:01/01/2005

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