title: Changes of cell growth and magnetosome biomineralization in Magnetospirillum magneticum AMB-1 after ultraviolet-B irradiation.
abstract: Effects of ultraviolet radiation on microorganisms are of great interest in field of microbiology and planetary sciences. In the present study, we used Magnetospirillum magneticum AMB-1 as a model organism to examine the influence of ultraviolet-B (UV-B) radiation on cell growth and magnetite biomineralization of magnetotactic bacteria (MTB). Live AMB-1 cells were exposed to UV-B radiation for 60, 300 and 900 s, which correspond to radiation doses of 120 J/m(2), 600 J/m(2), and 1800 J/m(2), respectively. After irradiation, the amounts of cyclobutane pyrimidine dimers (CPD) and reactive oxygen species (ROS) of the cells were increased, and cell growth was stunted up to ~170 h, depending on the UV-B radiation doses. The UV-B irradiated cells also produced on average more magnetite crystals with larger grain sizes and longer chains, which results in changes of their magnetic properties.
authors.affiliation: Biogeomagnetism Group, Paleomagnetism and Geochronology Laboratory, Key Laboratory of the Earth's Deep Interior, Institute of Geology and Geophysics, Chinese Academy of Sciences Beijing, China ; France-China Bio-Mineralization and Nano-Structures Laboratory, Chinese Academy of Sciences Beijing, China.
authors.forename: Yinzhao
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Biogeomagnetism Group, Paleomagnetism and Geochronology Laboratory, Key Laboratory of the Earth's Deep Interior, Institute of Geology and Geophysics, Chinese Academy of Sciences Beijing, China ; France-China Bio-Mineralization and Nano-Structures Laboratory, Chinese Academy of Sciences Beijing, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Lin
authors.affiliation: Biogeomagnetism Group, Paleomagnetism and Geochronology Laboratory, Key Laboratory of the Earth's Deep Interior, Institute of Geology and Geophysics, Chinese Academy of Sciences Beijing, China ; France-China Bio-Mineralization and Nano-Structures Laboratory, Chinese Academy of Sciences Beijing, China.
authors.forename: Jinhua
authors.initials: J
authors.lastname: Li
authors.affiliation: Biogeomagnetism Group, Paleomagnetism and Geochronology Laboratory, Key Laboratory of the Earth's Deep Interior, Institute of Geology and Geophysics, Chinese Academy of Sciences Beijing, China ; France-China Bio-Mineralization and Nano-Structures Laboratory, Chinese Academy of Sciences Beijing, China.
authors.forename: Yongxin
authors.initials: Y
authors.lastname: Pan
keywords: cell growth; magnetotactic bacteria; microbial biomineralization; rock magnetic measurement; ultraviolet-B radiation