Encontrados 19 documentos, a visualizar página 1 de 2
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...
Physico-chemical property prediction and environmental fate modelling of N-acyl...
Schröder, B.; Martins, M.A.R.; Pinho, Simão; Coutinho, J.A.P.(Subcooled) vapour pressures, aqueous solubilities, Henry constants, log KOW and log KOC partition constants have been estimated for a set of N-acyl-chalcogenourea derivatives using several prediction methods (COSMO-RS in its COSMOtherm implementation, SPARC as well as EPA’s EPIsuite). The data are discussed in terms of substituent effects: how do subtle changes in the chemical composition influence basic physi...
Solubility of hesperetin in mixed solvents
Ferreira, Olga; Schroeder, B.; Coutinho, J.A.P.; Pinho, SimãoThe study of the solubility of tlavonoids is essential to support the design of several separation processes in the food and pharmaceutical industries. Hesperetin is a flavanone with great importance for its promising biological and pharmacological properties.
The cation effect on the aqueous solubility of amino acids in the presence of s...
Tomé, L.I.N.; Pinho, Simão; Jorge, M.; Gomes, J.R.B.; Coutinho, J.A.P.Aiming at contributing to the understanding the molecular level mechanisms governing the behavior of biocompounds in aqueous saline environments, experimental solubility measurements and molecular dynamics (MD) simulations were performed for aqueous solutions of three amino acids (alanine, valine and isoleucine) in the presence of a series of inorganic salts.
Characterization by electrospray ionization and tandem mass spectrometry of rha...
Pereira, Jorge F. B.; Gudiña, Eduardo J.; Dória, M. L.; Domingues, M. R. M.; Rodrigues, L. R.; Teixeira, J. A.; Coutinho, J. A. P.In this work, biosurfactants produced by two Pseudomonas aeruginosa strains isolated from Brazilian crude oils were identified by proton nuclear magnetic resonance ((1)H NMR) and further characterized by mass spectrometry (MS) coupled with electrospray ionization (ESI) and tandem mass spectrometry (MS/MS) analysis in positive mode and their surface activities evaluated. Mono-rhamnolipids and di-rhamnolipids wer...
Experimental and molecular dynamics simulation studies on thee solubilityof ami...
Tomé, L.I.N.; Pinho, Simão; Jorge, M.; Gomes, J.R.B.; Coutinho, J.A.P.Separation and concentration of biological compounds are current subjects of interest due to their high cost in comparison to the total manufacture cost. For that purpose electrolytes may be employed as they can effect significantly biochemicals solubilities, a feature that has been used for salt-induced precipitation of proteins.
The cation effect on the aqueous solubility of amino acids in the presence of s...
Tomé, L.I.N.; Pinho, Simão; Jorge, M.; Gomes, J.R.B.; Coutinho, J.A.P.The study of the solubility behavior of amino acids and proteins in aqueous electrolyte solutions is of utmost importance to understand the biochemistry of natural systems, develop medical and pharmaceutical responses to diseases induced by biochemical disorders and improve the efficiency of biotechnological processes. Although the effect of common salts on the aqueous solubility of amino acids and proteins is ...
Enhanced oil recovery under laboratory conditions using biosurfactant-producing...
Gudiña, Eduardo J.; Pereira, Jorge F. B.; Rodrigues, L. R.; Coutinho, J. A. P.; Teixeira, J. A.Oil recovery comprises a primary phase, which produces oil using the natural pressure drive of the reservoir, and a secondary phase, which includes the injection of water to improve the flow of oil to the wellhead [1,2]. While primary recovery produces 5-10% of the original oil in place, recovery efficiencies in the secondary stage vary from 10% to 40% [1]. Most of the unrecovered oil (up to two-thirds of the t...
Microbial degradation of hydrocarbons and its applications to enhanced oil reco...
Pereira, Jorge F. B.; Gudiña, Eduardo J.; Rodrigues, L. R.; Teixeira, J. A.; Coutinho, J. A. P.The renewed interest in Enhanced Oil Recovery (EOR) techniques as a consequence of the current oil prices is boosting the development of the Microbial Enhanced Oil Recovery (MEOR). This technique is useful to recover incremental oil from a reservoir beyond primary and secondary recovery operations and can be carried by the injection of exogenous or stimulation of indigenous microorganisms. This last approach is...
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