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Rheological variability of Pseudomonas aeruginosa biofilms

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Abstract

A current trend in biofilm research uses viscoelasticity to evaluate biological mechanisms used to adapt to environmental changes. However, due to un-quantified variability in mechanical properties, it is difficult to make comparisons between different growth conditions, strains, or species. To interpret biofilm viscoelasticity requires understanding its statistical variance divorced from experimental technique. In this work, 23 P. aeruginosa biofilms at air/water interfaces are characterized using an interfacial rheometer. This provides the least disturbance to the biofilm, allowing a truer sense of biological variability. Experiments were conducted in 3 sets in 2 different labs. Moduli varied 1 order of magnitude within a single set. Statistical analysis confirms that under seemingly identical growth conditions, viscoelastic moduli were different based on experiment location, which is attributed to minor changes in ambient conditions. Understanding this variance will lead to a better evaluation and comparison of biofilm formation in future studies.

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Acknowledgments

The authors would also like to thank Dr. Michael San Francisco of TTU, Dr. Kendra Rumbaugh of TTU HSC and Dr. Vernita Gordon of UT for all their help in supplying bacteria, educating the authors in bacteria culturing technique, and a wide range of useful discussions.

Funding

This work was funded by the NSF CMMI (#1635245).

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Authors and Affiliations

  1. Department of Mechanical Engineering, Texas Tech University, Lubbock, TX, USA

    Lingjuan Qi & Gordon F. Christopher

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  1. Lingjuan Qi
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Correspondence to Gordon F. Christopher.

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Qi, L., Christopher, G.F. Rheological variability of Pseudomonas aeruginosa biofilms. Rheol Acta 60, 219–230 (2021). https://doi.org/10.1007/s00397-021-01260-w

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  • DOI: https://doi.org/10.1007/s00397-021-01260-w

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