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Differential isotopic fractionation during Cr(VI) reduction by an aquifer-derived bacterium under aerobic versus denitrifying conditions.
机构信息
Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, USA.
出版信息
Appl Environ Microbiol. 2012 Apr;78(7):2462-4. doi: 10.1128/AEM.07225-11. Epub 2012 Jan 27.
Abstract
We studied Cr isotopic fractionation during Cr(VI) reduction by Pseudomonas stutzeri strain RCH2. Despite the fact that strain RCH2 reduces Cr(VI) cometabolically under both aerobic and denitrifying conditions and at similar specific rates, fractionation was markedly different under these two conditions (ε was ∼2‰ aerobically and ∼0.4‰ under denitrifying conditions).
摘要
我们研究了假单胞菌 RCH2 还原六价铬过程中的铬同位素分馏作用。尽管 RCH2 菌株在好氧和反硝化条件下以相似的比还原速率共代谢还原六价铬，但在这两种条件下的分馏作用却有显著差异（好氧条件下的分馏系数约为 2‰，反硝化条件下的分馏系数约为 0.4‰）。
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