期刊
出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2013925118
关键词
bacterial motility; microfluidic devices; space partitioning; wall escaper; wall accumulator
资金
- Defense Advanced Research Projects Agency [HR0011-16-2-0028, N660010318913]
- Natural Sciences and Engineering Research Council of Canada [RGPIN-2016-05019, RGPIN201804418]
- New Frontiers Research Fund of Canada [NFRFE201900129]
- Czech Science Foundation under grant agreement GACR [1711851Y]
- Australian Research Council Future Fellowship [FT180100698]
- Australian Research Council [FT180100698] Funding Source: Australian Research Council
Understanding the motility behavior of bacteria in confining microenvironments is crucial for various applications and the study showed that in moderate confinement, bacteria follow hydrodynamics-based predictions, while in tighter confining environments, steric interactions between bacteria and walls play a significant role in their movement, either pushing them in the same direction or leading to chaotic movement and trapping.
Understanding the motility behavior of bacteria in confining microenvironments, in which they search for available physical space and move in response to stimuli, is important for environmental, food industry, and biomedical applications. We studied the motility of five bacterial species with various sizes and flagellar architectures (Vibrio natriegens, Magnetococcus marinus, Pseudomonas putida, Vibrio fischeri, and Escherichia coli ) in microfluidic environments presenting various levels of confinement and geometrical complexity, in the absence of external flow and concentration gradients. When the confinement is moderate, such as in quasi-open spaces with only one limiting wall, and in wide channels, the motility behavior of bacteria with complex flagellar architectures approximately follows the hydrodynamics-based predictions developed for simple monotrichous bacteria. Specifically, V. natriegens and V. fischeri moved parallel to the wall and P. putida and E. coli presented a stable movement parallel to the wall but with incidental wall escape events, while M. marinus exhibited frequent flipping between wall accumulator and wall escaper regimes. Conversely, in tighter confining environments, the motility is governed by the steric interactions between bacteria and the surrounding walls. In mesoscale regions, where the impacts of hydrodynamics and steric interactions overlap, these mechanisms can either push bacteria in the same directions in linear channels, leading to smooth bacterial movement, or they could be oppositional (e.g., in mesoscale-sized meandered channels), leading to chaotic movement and subsequent bacterial trapping. The study provides a methodological template for the design of microfluidic devices for single-cell genomic screening, bacterial entrapment for diagnostics, or biocomputation.
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