NDLI: Mathematical Modelling of Toxic Metal Uptake and Efflux Pump in Metal-Resistant Bacterium Bacillus cereus Isolated From Heavy Crude Oil

Content Provider	Springer Nature Link
Author	Shaw, Dario R. Dussan, Jenny
Copyright Year	2015
Abstract	The aim of this study was to describe the mechanisms that native Bacillus cereus M6 isolated from heavy crude oil $^{o}$API gravity 11.5 uses to tolerate and/or resist toxic metals. Metal tolerance and removal of Pb(II), Cr(VI), and As(V) was determined. In addition, we evidenced the subcellular distribution of metals, the efflux pump kinetics, and morphological changes in metal-tolerant bacteria. B. cereus M6 exhibited strong tolerance and resistance to the metals evaluated and efficiently removed the metal content by operating efflux pumps and accumulating mainly in membrane fraction. Also, it was found that the model that best fit the efflux corresponds to an equation for resonant oscillations. B. cereus M6 uses mechanisms, including efflux pumps, intracellular and extracellular accumulation in parallel in order to maintain metal levels below a toxic threshold and overcome the effects of high concentrations. These findings are an approach of an energy-dependent efflux system to eliminate excessive amounts of crude oil-associated metals in Bacillus. B. cereus M6 may potentially be useful in designing improved strategies for the bioremediation of soils polluted with metals. Additionally, the prediction model developed would be useful for improving the monitoring of in vitro and in vivo bioremediation processes.
Starting Page	1
Ending Page	14
Page Count	14
File Format	PDF
ISSN	00496979
Journal	Water, Air, and Soil Pollution
Volume Number	226
Issue Number	4
e-ISSN	15732932
Language	English
Publisher	Springer International Publishing
Publisher Date	2015-03-25
Publisher Place	Cham
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Bacillus cereus Toxic metals Efflux pump Bioaccumulation Biosorption Mathematical modelling Environment Water Quality/Water Pollution Atmospheric Protection/Air Quality Control/Air Pollution Soil Science & Conservation Hydrogeology Climate Change/Climate Change Impacts
Content Type	Text
Resource Type	Article
Subject	Ecological Modeling Environmental Chemistry Pollution Environmental Engineering Water Science and Technology

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