期刊
BIOTECHNOLOGY AND BIOENGINEERING
卷 80, 期 3, 页码 289-296出版社
WILEY
DOI: 10.1002/bit.10376
关键词
biofilm; mechanical properties; shear stress; strength; viscoelasticity
资金
- NIGMS NIH HHS [R01 GM60052-01] Funding Source: Medline
A mathematical model describing the constitutive properties of biofilms is required for predicting biofilm deformation, failure, and detachment in response to mechanical forces. Laboratory observations indicate that biofilms are viscoelastic materials. Likewise, current knowledge of biofilm internal structure suggests modeling biofilms as associated polymer viscoelastic systems. Supporting experimental results and a system of viscoelastic fluid equations with a linear Jeffreys viscoelastic stress-strain law are presented here. This system of equations is based on elements of associated polymer physics and is also consistent with presented and previous experimental results. A number of predictions can be made. One particularly interesting result is the prediction of an elastic relaxation time on the order of a few minutes-biofilm disturbances on shorter time scales produce an elastic response, biofilm disturbances on longer time scales result in viscous flow, i.e., nonreversible biofilm deformation. Although not previously recognized, evidence of this phenomenon is in fact present in recent experimental results. (C) 2002 Wiley Periodicals, Inc.
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