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Journal
2013 | 11 | 5 | 801-810
Article title

Low frequency electric polarizability and zeta-potential of Escherichia coli HB101 (K-12) cells during inactivation with ethanol

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EN
Abstracts
EN
The electric properties of bacteria determine their non-specific interactions with the environment, in particular their pathogenic activity. The electric polarizability of Escherichia coli HB101 (K-12 strain) was studied while inactivation with ethanol (20–40 vol.%). The current investigation might be regarded as a continuation of previous research on the polarizability of E. coli at lower ethanol concentration (≤ 20 vol.%) and higher frequencies (≥ 20 kHz). The bacteria polarizability at low frequencies (4 Hz) shows anomalies (unexpected increase in the polarizability at certain ethanol concentrations), while the parameter decreases with an increase in the ethanol concentration at higher frequencies. We investigated for the possible reasons causing the anomalies - in our case reduced to the medium dielectric permittivity, the average cell length and the surface electric charge density distribution, related to bacterial lipopolysaccharides. We suggest a hypothesis for the molecular mechanism of changing the surface charge of E. coli, carried by lipopolysaccharides, induced by the non-ionic ethanol. [...]
Publisher

Journal
Year
Volume
11
Issue
5
Pages
801-810
Physical description
Dates
published
1 - 5 - 2013
online
27 - 2 - 2013
Contributors
author
  • Rostislaw Kaischev Institute of Physical Chemistry, Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria, any_gyurova@abv.bg
  • Department of Biophysics and Radiobiology, Faculty of Biology, Sofia University St. Kliment Ochridski, 1164, Sofia, Bulgaria
  • Department of Microbial Genetics, Institute of Microbiology, Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria
author
  • Department of Microbial Genetics, Institute of Microbiology, Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria
author
  • Rostislaw Kaischev Institute of Physical Chemistry, Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria
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Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.-psjd-doi-10_2478_s11532-013-0220-9
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