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Modelling biofilm-induced formation damage and biocide treatment in subsurface geosystems.

Ezeuko CC, Sen A, Gates ID - Microb Biotechnol (2012)

Bottom Line: Persisters describe small subpopulation of cells which are tolerant to biocide treatment.Biofilm tolerance to biocide treatment is regulated by persister cells and includes 'innate' and 'biocide-induced' factors.Also, a successful application of biological permeability conformance treatment involving geologic layers with flow communication is more complicated than simply engineering the attachment of biofilm-forming cells at desired sites.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemical and Petroleum Engineering, Schulich School of Engineering, University of Calgary, Calgary, Alberta, Canada. cezeuko@ucalgary.ca

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Related in: MedlinePlus

A simplified model algorithm depicting the general sequence of model calculations during each timestep. Biofilm is treated as an adsorbed phase on pore walls and detached biofilms are produced via the network outlet.
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Related In: Results  -  Collection

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fig03: A simplified model algorithm depicting the general sequence of model calculations during each timestep. Biofilm is treated as an adsorbed phase on pore walls and detached biofilms are produced via the network outlet.

Mentions: where Y is the yield coefficient (i.e. the ratio of biomass produced per unit of substrate consumed), λ+ is microbial specific growth rate, Es is an affinity constant (i.e. the substrate concentration supporting one-half the maximum growth or nutrient uptake rate), and ϕv is the non-persister cell concentration (mass per unit pore volume). Nutrient consumption results in biofilm growth and accumulation. To avoid instabilities resulting from discretization of the governing equations, the time step is chosen to be equal to Δt = V/qmax; this denotes the global minimum time for flow between nodes in the network. The overall algorithm, presented in Fig. 3, consists of an iterative sequence to simulate biofilm evolution under flow conditions in interconnected porous media.


Modelling biofilm-induced formation damage and biocide treatment in subsurface geosystems.

Ezeuko CC, Sen A, Gates ID - Microb Biotechnol (2012)

A simplified model algorithm depicting the general sequence of model calculations during each timestep. Biofilm is treated as an adsorbed phase on pore walls and detached biofilms are produced via the network outlet.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3815385&req=5

fig03: A simplified model algorithm depicting the general sequence of model calculations during each timestep. Biofilm is treated as an adsorbed phase on pore walls and detached biofilms are produced via the network outlet.
Mentions: where Y is the yield coefficient (i.e. the ratio of biomass produced per unit of substrate consumed), λ+ is microbial specific growth rate, Es is an affinity constant (i.e. the substrate concentration supporting one-half the maximum growth or nutrient uptake rate), and ϕv is the non-persister cell concentration (mass per unit pore volume). Nutrient consumption results in biofilm growth and accumulation. To avoid instabilities resulting from discretization of the governing equations, the time step is chosen to be equal to Δt = V/qmax; this denotes the global minimum time for flow between nodes in the network. The overall algorithm, presented in Fig. 3, consists of an iterative sequence to simulate biofilm evolution under flow conditions in interconnected porous media.

Bottom Line: Persisters describe small subpopulation of cells which are tolerant to biocide treatment.Biofilm tolerance to biocide treatment is regulated by persister cells and includes 'innate' and 'biocide-induced' factors.Also, a successful application of biological permeability conformance treatment involving geologic layers with flow communication is more complicated than simply engineering the attachment of biofilm-forming cells at desired sites.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemical and Petroleum Engineering, Schulich School of Engineering, University of Calgary, Calgary, Alberta, Canada. cezeuko@ucalgary.ca

Show MeSH
Related in: MedlinePlus