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3-D Multi-Species Biofilm Models. F. Gao, X. Zhong, H. La, S. Krone, L. Forney. Model based on nutrient diffusion and energy allocation. (1). (3). (2). nutrient diffusion. Nutrient concentration in bulk liquid is set to be constant and normalized to 1.0;

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3 d multi species biofilm models

3-D Multi-Species Biofilm Models

F. Gao, X. Zhong, H. La, S. Krone, L. Forney



Nutrient diffusion
nutrient diffusion

  • Nutrient concentration in bulk liquid is set to be constant and normalized to 1.0;

  • Nutrient diffuses vertically through biofilm, from top down;

  • A site obtain nutrients diffusing from a cone-shaped region above the site

a site


Birth rate
Birth rate

1

Maintenance

2

Energy

Nutrient

Stress response

ATP

Conversion

coefficient

3

Growth

  • Allows multiple nutrients

  • Metabolism

  • Effects of environment on growth rate


Placement of offspring
Placement of offspring

  • Growth is suppressed if all neighboring sites are occupied

  • Daughter cell placed at vacant direct neighbor chosen at random

  • If no direct neighbors available, 2nd direct neighbors considered

6 direct nbrs 26 2nd direct nbrs

6 direct nbrs 26 2nd direct nbrs


Death rate
Death rate

  • Death rate increased if a cell fails to get enough energy for maintenance and stress response

  • Death rate is proportional to the gap between the energy demand & actual energy available


Collapse
Collapse

  • Maximum thickness

  • Self regulation

before

after


Simulations
simulations

  • 3 species: 2 aerobic and 1 anaerobic

  • 2 aerobic species

  • 2 species: 1 aerobic and 1 anaerobic

  • randomly initialized


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