title: [Dielectric characteristics of intact and copper-modified bacteria Escherichia coli].
abstract: The dielectric parameters of the intact and Cu(2+)-modified concentrated Escherichia coli populations in the frequency range of alternating current 20 Hz-100 MHz were studied. It was found that Cu(2+)-ions in low concentrations, which are mainly absorbed by active centres of the outer cell surface, change the dielectric characteristics of the inner membrane and simultaneously increase the conductivity of plasma membrane in the frequency-independent region 10(5)-10(6) Hz. It was concluded that the disturbances in the barrier properties of plasma membrane by the action of Cu2+ are closely related to changes in the dielectric parameters of intact bacteria.
authors.affiliation: Institute of Energy Problems of Chemical Physics, Russian Academy of Sciences, Leninskii prosp. 38, korp. 2, Moscow, GSP-1, 117334 Russia.
authors.forename: L A
authors.initials: LA
authors.lastname: Volodina
authors.forename: G G
authors.initials: GG
authors.lastname: Petrzhik
mesh_terms: D002462:Cell Membrane / Q000737:chemistry / Q000378:metabolism; D002463:Cell Membrane Permeability / Q000187:drug effects; D003300:Copper / Q000494:pharmacology*; D004553:Electric Conductivity; D004926:Escherichia coli / Q000737:chemistry / Q000187:drug effects* / Q000378:metabolism
chemical_list: D003300:Copper; C029892:cupric chloride