Encontrados 25 documentos, a visualizar página 1 de 3
Optimization and characterization of biosurfactant production by Bacillus subti...
Pereira, J. F.; Gudiña, Eduardo J.; Costa, Rita; Vitorino, Rui; Teixeira, J. A.; Coutinho, João A. P.; Rodrigues, L. R.Biosurfactant production by three Bacillus subtilis strains (#309, #311 and #573) isolated from Brazilian crude oils was optimized based on different carbon and nitrogen sources. The lowest surface tension values were obtained using sucrose containing media for the three isolates. Biosurfactants produced by each strain were characterized by Fourier transform infrared spectroscopy (FTIR), proton nuclear magnetic...
Partial characterization of biosurfactant from Lactobacillus pentosus and compa...
Moldes, Ana; Paradelo, R.; Vecino, X.; Cruz, J. M.; Gudiña, Eduardo J.; Rodrigues, L. R.; Teixeira, J. A.; Dominguez, José Manuel; Barral, M. T.The capability of a cell bound biosurfactant produced by Lactobacillus pentosus, to accelerate the bioremediation of a hydrocarbon-contaminated soil, was compared with a synthetic anionic surfactant (sodium dodecyl sulphate SDS-). The biosurfactant produced by the bacteria was analyzed by Fourier transform infrared spectroscopy (FTIR) that clearly indicates the presence of OH and NH groups, C=O stretching of ca...
Biosurfactant-producing and oil-degrading Bacillus subtilis strains enhance oil...
Gudiña, Eduardo J.; Pereira, J. F.; Costa, Rita; Coutinho, João A. P.; Teixeira, J. A.; Rodrigues, L. R.Microbial Enhanced Oil Recovery (MEOR) technology uses microorganisms and their metabolites to retrieve unrecoverable oil from mature reservoirs. In situ stimulation of biosurfactant-producing and oil-degrading microorganisms reduces the capillary forces retaining the oil inside the reservoir and decreases its viscosity, thus promoting oil flow and consequently production. In this work, a sand-pack column model...
Potential therapeutic applications of biosurfactants
Gudiña, Eduardo J.; Rangarajan, Vivek; Ramkrishna, Sen; Rodrigues, L. R.Biosurfactants have recently emerged as promising molecules for their structural novelty, versatility, and diverse properties that are potentially useful for many therapeutic applications. Mainly due to their surface activity, these molecules interact with cell membranes of several organisms and/or with the surrounding environments, and thus can be viewed as potential cancer therapeutics or as constituents of d...
A biosurfactant-producing and oil-degrading Bacillus subtilis strain enhances o...
Gudiña, Eduardo J.; Pereira, J. F.; Costa, Rita; Rodrigues, L. R.; Coutinho, João A. P.; Teixeira, J. A.Microbial Enhanced Oil Recovery (MEOR) is potentially useful to increment oil recovery from reservoirs beyond primary and secondary recovery operations using microorganisms and their metabolites. In situ stimulation of microorganisms that produce biosurfactants and degrade heavy oil fractions reduces the capillary forces that retain the oil inside the reservoir and decreases oil viscosity, thus promoting its fl...
Evaluation and characterization of biosurfactants produced by microorganisms is...
Pereira, J. F.; Gudiña, Eduardo J.; Costa, Rita; Rodrigues, L. R.; Teixeira, J. A.; Coutinho, João A. P.Surface-active agents or surfactants are amphiphilic molecules that comprise both hydrophilic and hydrophobic moieties, allowing the reduction of the surface and interfacial tensions, as well as the formation of oil in water or water in oil emulsions. Due to their interesting properties, surfactants are widely used by petroleum industries to reduce the capillary forces that retain the oil inside the reservoir. ...
Improved biosurfactant production by a Pseudomonas aeruginosa strain using agro...
Gudiña, Eduardo J.; Rodrigues, Ana I.; Teixeira, J. A.; Rodrigues, L. R.Microbial surfactants are amphipathic molecules produced by a variety of microorganisms that exhibit pronounced surface and emulsifying activities. Biosurfactants can replace synthetic surfactants in environmental and industrial applications, such as bioremediation and microbial enhanced oil recovery. Furthermore, some biosurfactants have been reported as suitable alternatives to synthetic medicines and antimic...
Ehanced oil recovery under simulated reservoir conditions using an indigenous B...
Gudiña, Eduardo J.; Pereira, Jorge F. B.; Costa, A. R.; Rodrigues, L. R.; Coutinho, J. A. P.; Teixeira, J. A.Microbial Enhanced Oil Recovery (MEOR) is potentially useful to increment oil recovery from reservoirs beyond primary and secondary recovery operations using microorganisms and their metabolites. In situ stimulation of microorganisms that produce biosurfactants and degrade heavy oil fractions reduces the capillary forces that retain the oil inside the reservoir and decreases oil viscosity, thus promoting its fl...
Production and characterization of biosurfactants produced by microorganisms is...
Pereira, Jorge F. B.; Costa, A. R.; Gudiña, Eduardo J.; Rodrigues, L. R.; Teixeira, J. A.; Coutinho, J. A. P.Surfactants are amphiphilic molecules that comprise both hydrophilic and hydrophobic moieties, allowing the reduction the surface and interfacial tensions, as well as the formation of oil in water or water in oil emulsions. These surface-active compounds are extensively used by petroleum industries in order to reduce the capillary forces that entrapped the oil inside the reservoir. The compounds synthetized che...
Biosurfactant producing microorganisms and its application to enhanced oil reco...
Gudiña, Eduardo J.; Pereira, J. F.; Rodrigues, L. R.; Coutinho, J. A.; Teixeira, J. A.; Soares, L. P.Microbial Enhanced Oil Recovery (MEOR) is a tertiary oil recovery process where microorganisms and their metabolites are used to retrieve unrecoverable oil from mature reservoirs. Stimulation of biosurfactant production by indigenous microorganisms can reduce the capillary forces that retain the oil into the reservoir. The studied reservoir is characterized by alternated oil and water sand layers, with an avera...
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