1. Susceptibility to heavy metals and cadmium accumulation in aerobic and anaerobic thermophilic microorganisms isolated from deep-sea hydrothermal vents.
- Author
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Llanos J, Capasso C, Parisi E, Prieur D, and Jeanthon C
- Subjects
- Bacillus growth & development, Bacteria, Anaerobic metabolism, Cadmium analysis, Cadmium pharmacology, Cobalt pharmacology, Culture Media, Drug Resistance, Microbial, Hydrogen-Ion Concentration, Metals, Heavy analysis, Microbial Sensitivity Tests, Pacific Ocean, Time Factors, Zinc pharmacology, Bacillus drug effects, Bacteria, Anaerobic drug effects, Metals, Heavy pharmacology, Thermococcales drug effects, Water Microbiology
- Abstract
Thirty thermophilic strains isolated from heavy metal-rich hydrothermal vent sites at Lau Basin were tested for their susceptibility to cadmium, zinc, cobalt, and nickel. The 14 aerobic spore formers belonging to the genus Bacillus, 6 anaerobic fermenters from the order Thermotogales, and 10 anaerobic sulfur reducers from the order Thermococcales could be clearly distinguished according to their metal susceptibilities. The Thermococcales were found to exhibit the highest resistance to cadmium and zinc, whereas Thermotogales were highly sensitive to these metals. In contrast, the Thermotogales displayed the highest resistance to cobalt ions. No clear distinction could be established between the metal susceptibilities of these strains and seven reference organisms used for comparative studies. Cadmium resistance, slightly inducible in some cadmium-resistant bacilli, was not plasmid mediated. The amount of cadmium immobilized by the Thermotogales was related to their level of resistance to this metal.
- Published
- 2000
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