title: Extremely high frequency electromagnetic radiation enforces bacterial effects of inhibitors and antibiotics.
abstract: The coherent electromagnetic radiation (EMR) of the frequency of 51.8 and 53 GHz with low intensity (the power flux density of 0.06 mW/cm(2)) affected the growth of Escherichia coli K12(lambda) under fermentation conditions: the lowering of the growth specific rate was considerably (approximately 2-fold) increased with exposure duration of 30-60 min; a significant decrease in the number of viable cells was also shown. Moreover, the enforced effects of the N,N'-dicyclohexylcarbodiimide (DCCD), inhibitor of H(+)-transporting F(0)F(1)-ATPase, on energy-dependent H(+) efflux by whole cells and of antibiotics like tetracycline and chloramphenicol on the following bacterial growth and survival were also determined after radiation. In addition, the lowering in DCCD-inhibited ATPase activity of membrane vesicles from exposed cells was defined. The results confirmed the input of membranous changes in bacterial action of low intensity extremely high frequency EMR, when the F(0)F(1)-ATPase is probably playing a key role. The radiation of bacteria might lead to changed metabolic pathways and to antibiotic resistance. It may also give bacteria with a specific role in biosphere.
authors.affiliation: Department of Biophysics, Yerevan State University, 0025, Yerevan, Armenia.
authors.forename: Hasmik
authors.initials: H
authors.lastname: Tadevosyan
authors.forename: Vitaly
authors.initials: V
authors.lastname: Kalantaryan
authors.forename: Armen
authors.initials: A
authors.lastname: Trchounian
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D025243:Bacterial Proton-Translocating ATPases / Q000037:antagonists & inhibitors / Q000378:metabolism; D004024:Dicyclohexylcarbodiimide / Q000494:pharmacology*; D024881:Drug Resistance, Bacterial / Q000528:radiation effects; D048168:Escherichia coli K12 / Q000187:drug effects / Q000254:growth & development* / Q000378:metabolism / Q000528:radiation effects*; D011827:Radiation; D012680:Sensitivity and Specificity
chemical_list: D000900:Anti-Bacterial Agents; D004024:Dicyclohexylcarbodiimide; D025243:Bacterial Proton-Translocating ATPases