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Investigation of Surfactin Behavior at the Presence of Wate, Oil, and Asphaltene
, M.Sc. Thesis Sharif University of Technology ; Roosta Azad, Reza (Supervisor) ; Yaghmaee, Soheyla (Supervisor)
Abstract
In this research, the behavior of surfactin at the presence of water, decane, and asphaltene is investigated. Decane is chosen instead of crude oil to simplify the model. In the first chapter, basic molecular structures are introduced. Furthermore, in the second chapter molecular dynamics simulation, as the main tool in these simulations, is introduced. In the third chapter, one of the most important quantities in chemical engineering, diffusion coefficient, is chosen to investigate the efficiency and accuracy of molecular dynamics simulation method to calculate such a quantity and results show that molecular dynamics simulation can present accurate quantities, more accurate than common...
Isolation and screening of Bacillus subtilis MJ01 for MEOR application: biosurfactant characterization, production optimization and wetting effect on carbonate surfaces
, Article Journal of Petroleum Exploration and Production Technology ; Volume 9, Issue 1 , 2019 , Pages 233-245 ; 21900558 (ISSN) ; Ganji Azad, E ; Deihimi, T ; Niazi, A ; Ayatollahi, S ; Sharif University of Technology
Springer Verlag
2019
Abstract
The bacterial strain MJ01 was isolated from stock tank water of one of the Iranian south oil field production facilities. The 16S rRNA gene of isolate, MJ01, showed 99% similarity to Bacillus subtilis. The results revealed that biosurfactant produced by this strain was lipopeptide-like surfactin based on FTIR analysis. Critical micelle concentration of produced surfactin in distilled water was 0.06 g/l. Wettability study showed that at zero salinity surfactin can change original oil-wet state to water-wet state, but in seawater salinity it cannot modify the wettability significantly. To utilize this biosurfactant in ex situ MEOR process, economical and reservoir engineering technical...
Genome annotation and comparative genomic analysis of Bacillus subtilis MJ01, a new bio-degradation strain isolated from oil-contaminated soil
, Article Functional and Integrative Genomics ; Volume 18, Issue 5 , 2018 , Pages 533-543 ; 1438793X (ISSN) ; Niazi, A ; Deihimi, T ; Taghavi, S. M ; Ayatollahi, S ; Ebrahimie, E ; Sharif University of Technology
Springer Verlag
2018
Abstract
One of the main challenges in elimination of oil contamination from polluted environments is improvement of biodegradation by highly efficient microorganisms. Bacillus subtilis MJ01 has been evaluated as a new resource for producing biosurfactant compounds. This bacterium, which produces surfactin, is able to enhance bio-accessibility to oil hydrocarbons in contaminated soils. The genome of B. subtilis MJ01 was sequenced and assembled by PacBio RS sequencing technology. One big contig with a length of 4,108,293 bp without any gap was assembled. Genome annotation and prediction of gene showed that MJ01 genome is very similar to B. subtilis spizizenii TU-B-10 (95% similarity). The comparison...