Abstract:
:The aim of this study was to verify whether extremely low frequency (ELF) magnetic fields (MF) could affect transposition activity like some environmental stress factors such as heat shock or UV irradiation. Using an Escherichia coli Lac Z(-) strain transformed with a plasmid containing a Tn 10 derivative element expressing beta-galactosidase only after transposition, it was possible to determine the events of transposition evaluating the rate at which the colonies developed dark coloured papillae (Lac Z(+)). We found that those bacteria that had been exposed for a long time (58 h) to a 50 Hz low intensity MF (0.1-1 mT) gave colonies with significantly lower transposition activity compared to sham-exposed bacteria. Such reduction in transposition activity was positively correlated to the intensity of the MF, in a dose-effect manner. This phenomenon was not affected by bacterial cell proliferation, since no significant differences were observed in number, diameter and perimeter between sham-exposed and MF-exposed colonies.
journal_name
Radiat Environ Biophysjournal_title
Radiation and environmental biophysicsauthors
Del Re B,Garoia F,Mesirca P,Agostini C,Bersani F,Giorgi Gdoi
10.1007/s00411-003-0192-9keywords:
subject
Has Abstractpub_date
2003-07-01 00:00:00pages
113-8issue
2eissn
0301-634Xissn
1432-2099journal_volume
42pub_type
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