Department of Civil and Environmental Engineering, The University of Tennessee, Knoxville, TN 37996, USA.
Bioresour Technol. 2011 Feb;102(3):3578-80. doi: 10.1016/j.biortech.2010.10.046. Epub 2010 Oct 15.
The capability of Anaeromyxobacter dehalogenans to reduce Se(IV) to Se(0) as a detoxification mechanism suggests a potential role of these ecologically important microorganisms in the biogeochemical cycling of selenium and the control of selenium contamination. However, the reduction of Se(IV) by the energetically versatile A. dehalogenans could be hindered by its ability to use alternative electron acceptors, particularly Fe(III) and humic substances which are ubiquitous in the environment. Indeed, the presence of Fe(III) partially inhibited Se(IV)-reducing activity. Nonetheless, reduction of both Se(IV) and Fe(III) proceeded simultaneously, a characteristic desirable for bioremediation efforts in many environments abundant with Fe(III). The enhancement of Se(IV) reduction by anthraquinone-2,6-disulfonate, a humic substance analog, is advantageous for microbial selenium biotransformation given the broad distribution of humic substances in natural environments, which could be exploited for the design of improved control strategies for selenium pollution.
厌氧盐单胞菌能够将硒（IV）还原为硒（0），这是一种解毒机制，表明这些在生态上重要的微生物在硒的生物地球化学循环和控制硒污染方面可能发挥作用。然而，由于厌氧盐单胞菌具有利用替代电子受体（特别是铁（III）和在环境中普遍存在的腐殖质）的能力，因此其还原硒（IV）的能力可能受到阻碍。事实上，铁（III）的存在部分抑制了硒（IV）的还原活性。尽管如此，硒（IV）和铁（III）的还原仍同时进行，这是许多富含铁（III）的环境中生物修复工作所需要的特征。蒽醌-2,6-二磺酸钠（腐殖质类似物）增强了硒（IV）的还原，这对微生物硒的生物转化是有利的，因为腐殖质在自然环境中的广泛分布，可以被用来设计改进的硒污染控制策略。
