title: Heavy-ion effects on bacteria spores: the impact parameter dependence of the inactivation.
abstract: The impact parameter dependence of the inactivation of Bacillus subtilis-spores has been measured using a heavy-ion minibeam facility, which permits single-ion exposure of individual spores with a spatial accuracy of about 1 micron. The apparatus consists basically of a collimator and a microscope used to position the biological objects directly behind the collimator. Measurements were obtained for nickel, tin, and uranium ions at 1.4 MeV/u. for central hits the results show an inactivation probability of less than one with a continuous decrease in inactivation with increasing distance. Long-ranging effects which extend beyond the range of the delta electrons could not be confirmed.
authors.affiliation: GSI Biophysik, Darmstadt, Germany.
authors.forename: U
authors.initials: U
authors.lastname: Weisbrod
authors.forename: H
authors.initials: H
authors.lastname: Bücker
authors.forename: G
authors.initials: G
authors.lastname: Horneck
authors.forename: G
authors.initials: G
authors.lastname: Kraft
mesh_terms: D001412:Bacillus subtilis / Q000528:radiation effects*; D016923:Cell Death / Q000528:radiation effects; D004735:Energy Transfer; D007477:Ions; D009532:Nickel; D013171:Spores, Bacterial / Q000528:radiation effects; D014001:Tin; D014501:Uranium
chemical_list: D007477:Ions; D014501:Uranium; D014001:Tin; D009532:Nickel