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Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions
08:41

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Published on: September 7, 2018

Prokaryotic transport in electrohydrodynamic structures.

A H Paulitsch-Fuchs1, E C Fuchs, A D Wexler

  • 1Wetsus, Centre of Excellence for Sustainable Water Technology, Leeuwarden, The Netherlands.

Physical Biology
|April 6, 2012
PubMed
Summary
This summary is machine-generated.

Bacterial cells, including Escherichia coli, can survive and be transported through an electrohydrodynamic (EHD) liquid bridge. Their movement is primarily towards the anode due to negative surface charge, with some cells showing increased luminescence post-transport.

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Area of Science:

  • * Electrochemistry
  • * Microbiology
  • * Biophysics

Background:

  • * High-voltage direct current applied to two beakers of water forms a horizontal electrohydrodynamic (EHD) bridge.
  • * Bacterial cell behavior within such EHD systems is not well understood.

Purpose of the Study:

  • * To investigate the transport and survival of bacterial cells within an EHD liquid bridge.
  • * To identify the forces influencing bacterial cell movement in an EHD bridge.
  • * To assess the physiological changes in bacteria after traversing the EHD bridge.

Main Methods:

  • * Optical and microbiological techniques were used to monitor bacterial transport.
  • * Escherichia coli strains (top10 and bioluminescent YMC10) were introduced into the EHD bridge setup.
  • * Cell survival and movement towards the anode were quantified.

Main Results:

  • * Escherichia coli strains survived exposure to the EHD liquid bridge.
  • * Bacteria were predominantly transported towards the anode, attributed to their negative surface charge.
  • * Dielectrophoresis and hydrostatic forces contributed to minor transport in the opposite direction.
  • * Most surviving E. coli YMC10 bacteria showed increased luminescence after 24 hours.

Conclusions:

  • * EHD liquid bridges can support bacterial cell viability and facilitate directed transport.
  • * Negative surface charge is the primary driver for E. coli migration towards the anode.
  • * Enhanced luminescence in surviving bacteria may result from nutrient limitation or a 'survival of the fittest' phenomenon.