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  • 1 Chavchavadze State University 32, Chavchavadze ave. Tbilisi 0178 Georgia
  • 2 Andronikashvili Institute of Physics 6, Tamarashvili st. Tbilisi 0177 Georgia
  • 3 Center for Environmental Biotechnology Lawrence Berkeley National laboratory Berkeley CA 94720 USA
  • 4 Joint Institute for Nuclear Research Frank Laboratory of Neutron Physics 141980 Dubna, Moscow Region Russia
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The dose-dependent formation of Cr(III) complexes and uptake of chromium by Arthrobacter oxydans — a Gram-positive bacterium from contaminated Columbian basalt rocks (USA) — were studied along with the testing under aerobic conditions of two bacterial strains of Arthrobacter genera isolated from the polluted basalts from the Republic of Georgia. Instrumental neutron activation analysis (INAA) was used to track the accumulation of chromium in the bacterial cells. To monitor and identify Cr(III) complexes in these bacteria, electron spin resonance (ESR) spectrometry was employed.