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Apparatus is setup as shown. An earth is needed next to the probe electrode, but not touching. They will be needed within the same solution to reduce the noise.

  • Cells containing biobrick K090002 are grown overnight in NOK with 5%(by vol.) 2M KCl added.
  • Samples are then spun down in individual 1.5ml eppendorfs.


  • Resuspend cells in 200μL clean NOK and place in sample wells
  • Lower probe electrode into cell solution and wait for stable reading - 1min.
  • Add sample solution