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Title: Analysis of Factors Limiting Bacterial Growth in PDMS Mother Machine Devices

Journal Article · · Frontiers in Microbiology
 [1];  [1];  [2]; ORCiD logo [3];  [1]
  1. The Univ. of Tennessee, Knoxville, TN (United States)
  2. Univ. of Tennessee, Knoxville, TN (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

The microfluidic mother machine platform has attracted much interest for its potential in studies of bacterial physiology, cellular organization, and cell mechanics. Despite numerous experiments and development of dedicated analysis software, differences in bacterial growth and morphology in narrow mother machine channels compared to typical liquid media conditions have not been systematically characterized. Here we determine changes in E. coli growth rates and cell dimensions in different sized dead-end microfluidic channels using high resolution optical microscopy. We find that E. coli adapt to the confined channel environment by becoming narrower and longer compared to the same strain grown in liquid culture. Cell dimensions decrease as the channel length increases and width decreases. These changes are accompanied by increases in doubling times in agreement with the universal growth law. In channels 100 μm and longer, cell doublings can completely stop as a result of frictional forces that oppose cell elongation. Before complete cessation of elongation, mechanical stresses lead to substantial deformation of cells and changes in their morphology. Lastly, our work shows that mechanical forces rather than nutrient limitation are the main growth limiting factor for bacterial growth in long and narrow channels.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1436023
Journal Information:
Frontiers in Microbiology, Vol. 9; ISSN 1664-302X
Publisher:
Frontiers Research FoundationCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 35 works
Citation information provided by
Web of Science

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  • Yang, Da; Greer, Clayton M.; Jones, Branndon P.
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journal November 2015
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Cited By (6)

Microbial single-cell growth response at defined carbon limiting conditions journal January 2019
Cell cycle-dependent regulation of FtsZ in Escherichia coli in slow growth conditions: Cell cycle-dependent regulation of FtsZ in Escherichia coli journal October 2018
The effects of polydisperse crowders on the compaction of the Escherichia coli nucleoid journal February 2020
Microbial single-cell growth response at defined carbon limiting conditions text January 2019
Metabolic activity affects response of single cells to a nutrient switch in structured populations text January 2019
Comparison of Escherichia coli surface attachment methods for single-cell microscopy journal December 2019

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