Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.2172/1077002 |
报告编号 | DOE-GEORGIA TECH RES CORP-64124 |
来源ID | OSTI ID: 1077002 |
MOLECULAR MECHANISM OF MICROBIAL TECHNETIUM REDUCTION FINAL REPORT | |
DiChristina, Thomas J. [Georgia Tech] | |
2013-04-30 | |
出版年 | 2013 |
语种 | 英语 |
国家 | 美国 |
领域 | 地球科学 |
英文摘要 | Microbial Tc(VII) reduction is an attractive alternative strategy for bioremediation of technetium-contaminated subsurface environments. Traditional ex situ remediation processes (e.g., adsorption or ion exchange) are often limited by poor extraction efficiency, inhibition by competing ions and production of large volumes of produced waste. Microbial Tc(VII) reduction provides an attractive alternative in situ remediation strategy since the reduced end-product Tc(IV) precipitates as TcO2, a highly insoluble hydrous oxide. Despite its potential benefits, the molecular mechanism of microbial Tc(VII) reduction remains poorly understood. The main goal of the proposed DOENABIR research project is to determine the molecular mechanism of microbial Tc(VII) reduction. Random mutagenesis studies in our lab have resulted in generation of a set of six Tc(VII) reduction-deficient mutants of Shewanella oneidensis. The anaerobic respiratory deficiencies of each Tc(VII) reduction-deficient mutant was determined by anaerobic growth on various combinations of three electron donors and 14 terminal electron acceptors. Results indicated that the electron transport pathways to Tc(VII), NO3 -, Mn(III) and U(VI) share common structural or regulatory components. In addition, we have recently found that wild-type Shewanella are also able to reduce Tc(IV) as electron acceptor, producing Tc(III) as an end-product. The recent genome sequencing of a variety of technetium-reducing bacteria and the anticipated release of several additional genome sequences in the coming year, provides us with an unprecedented opportunity to determine the mechanism of microbial technetium reduction across species and genus lines. |
英文关键词 | Microbial technetium reduction bioremediation technetium-contaminated subsurface environments in situ remediation strategy molecular mechanism |
URL | 查看原文 |
来源平台 | US Department of Energy (DOE) |
引用统计 | |
文献类型 | 科技报告 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/6254 |
专题 | 地球科学 |
推荐引用方式 GB/T 7714 | DiChristina, Thomas J. [Georgia Tech]. MOLECULAR MECHANISM OF MICROBIAL TECHNETIUM REDUCTION FINAL REPORT,2013. |
条目包含的文件 | 条目无相关文件。 |
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