A three-dimensional computer model analysis of three hypothetical biofilm detachment mechanisms

@article{citeulike:2599360, abstract = {Three hypothetical mechanisms of detachment were incorporated into a three-dimensional computer model of biofilm development. The model integrated processes of substrate utilization, substrate diffusion, growth, cell advection, and detachment in a cellular automata framework. The purpose of this investigation was to characterize each of the mechanisms with respect to four criteria: the resulting biofilm structure, the existence of a steady state, the propensity for sloughing events, and the dynamics during starvation. The three detachment mechanisms analyzed represented various physical and biological influences hypothesized to affect biofilm detachment. The first invoked the concept of fluid shear removing biomass that protrudes far above the surface and is therefore subjected to relatively large drag forces. The second pathway linked detachment to changes in the local availability of a nutrient. The third pathway simulated an erosive process in which individual cells are lost from the surface of a biofilm cell cluster. The detachment mechanisms demonstrated diverse behaviors with respect to the four analysis criteria. The height-dependant mechanism produced flat, steady state biofilms that lacked sloughing events. Detachment based on substrate limitation produced significant sloughing events. The resulting biofilm structures included distinct, hollow clusters separated by channels. The erosion mechanism produced neither a non-zero steady state nor sloughing events. A mechanism combining all three-detachment mechanisms produced mushroom-like structures. The dynamics of biofilm decay during starvation were distinct for each detachment mechanism. These results show that detachment is a critical determinant of biofilm structure and of the dynamics of biofilm accumulation and loss. Biotechnol. Bioeng. 2007; 97: 1573-1584. {\copyright} 2007 Wiley Periodicals, Inc.}, address = {Center for Biofilm Engineering, and Department of Chemical and Biological Engineering, Montana State University - Bozeman, Bozeman, Montana 59717-3980; telephone: (406) 994-4770; fax: (406) 994-6098}, author = {Chambless, Jason D. and Stewart, Philip S. }, citeulike-article-id = {2599360}, doi = {10.1002/bit.21363}, journal = {Biotechnology and Bioengineering}, keywords = {biofilm, detachment}, number = {6}, pages = {1573--1584}, posted-at = {2008-03-26 18:08:46}, priority = {0}, title = {A three-dimensional computer model analysis of three hypothetical biofilm detachment mechanisms}, url = {http://dx.doi.org/10.1002/bit.21363}, volume = {97}, year = {2007} }

TY - JOUR ID - citeulike:2599360 L3 - citeulike-article-id:2599360 TI - A three-dimensional computer model analysis of three hypothetical biofilm detachment mechanisms JF - Biotechnology and Bioengineering VL - 97 IS - 6 SP - 1573 EP - 1584 AD - Center for Biofilm Engineering, and Department of Chemical and Biological Engineering, Montana State University - Bozeman, Bozeman, Montana 59717-3980; telephone: (406) 994-4770; fax: (406) 994-6098 N2 - Three hypothetical mechanisms of detachment were incorporated into a three-dimensional computer model of biofilm development. The model integrated processes of substrate utilization, substrate diffusion, growth, cell advection, and detachment in a cellular automata framework. The purpose of this investigation was to characterize each of the mechanisms with respect to four criteria: the resulting biofilm structure, the existence of a steady state, the propensity for sloughing events, and the dynamics during starvation. The three detachment mechanisms analyzed represented various physical and biological influences hypothesized to affect biofilm detachment. The first invoked the concept of fluid shear removing biomass that protrudes far above the surface and is therefore subjected to relatively large drag forces. The second pathway linked detachment to changes in the local availability of a nutrient. The third pathway simulated an erosive process in which individual cells are lost from the surface of a biofilm cell cluster. The detachment mechanisms demonstrated diverse behaviors with respect to the four analysis criteria. The height-dependant mechanism produced flat, steady state biofilms that lacked sloughing events. Detachment based on substrate limitation produced significant sloughing events. The resulting biofilm structures included distinct, hollow clusters separated by channels. The erosion mechanism produced neither a non-zero steady state nor sloughing events. A mechanism combining all three-detachment mechanisms produced mushroom-like structures. The dynamics of biofilm decay during starvation were distinct for each detachment mechanism. These results show that detachment is a critical determinant of biofilm structure and of the dynamics of biofilm accumulation and loss. Biotechnol. Bioeng. 2007; 97: 1573-1584. © 2007 Wiley Periodicals, Inc. KW - biofilm KW - detachment AU - Chambless, Jason AU - Stewart, Philip PY - 2007/// UR - http://dx.doi.org/10.1002/bit.21363 ER -