LExEn: Fe(III)-and Humics-Reducing Microorganisms in Extreme Environments

LExEn：极端环境中的 Fe(III) 和腐殖质还原微生物

• 批准号: 9714285
• 负责人: Derek Lovley
• 金额: $ 32.5万
• 依托单位: University of Massachusetts Amherst
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-09-15 至 2000-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9714285&HistoricalAwards=false
• 关键词: LExEn; Fe; III; Humics; Reducing

Lovely DEB-9714285 Fe(III)- and Humics-Reducing Microorganisms in Extreme Environments. Geochemical signatures potentially attributable to Fe(III)- and humics-reducing microorganisms have been found in modern and ancient extreme environments on Earth as well as on Mars. However, there has been little investigation of Fe(III)- and humics-reducing microorganisms in extreme environments. The goal of this research is to recover Fe(III)- and humics-reducing microorganisms from a variety of extreme environments and to study their metabolism and potential geochemical impacts. A major focus will be on geothermal environments because they are considered to be analogs for the environmental conditions that may have supported life on early Earth and possibly other planets. Other extreme environments that may provide insights into potential forms of microbial metabolism on other planets such as cold soils and sediments from polar regions, alkaline and hypersaline environments, as well as acidic mine drainage will also be studied. These studies are expected to suggest geochemical and/or biochemical signatures that may be used to evaluate the previous presence of Fe(III)- and humics-reducing microorganisms in ancient environments on Earth or other planets. These studies should greatly increase our understanding of the diversity of microorganisms capable of Fe(III) and humics reduction and may yield insights into the potential role of Fe(III) and external organic electron acceptors in the evolution of microbial respiration. Furthermore, the potential application of Fe(III) and humics reducers for environmental restoration, the recovery of precious metals, and the production of valuable minerals suggests that Fe(III) and humics reducers recovered from extreme environments may have economic value.

可爱的DEB-9714285 Fe(III)-和腐殖质-还原极端环境中的微生物。在地球和火星上的现代和古代极端环境中，已经发现了可能归因于铁(III)和腐殖质还原微生物的地球化学特征。然而，对极端环境中还原Fe(III)和腐殖质的微生物的研究很少。这项研究的目标是从各种极端环境中恢复还原Fe(III)和腐殖质的微生物，并研究它们的新陈代谢和潜在的地球化学影响。一个主要的重点将是地热环境，因为它们被认为类似于可能支持早期地球上生命的环境条件，也可能是其他行星上的生命。还将研究其他极端环境，这些环境可能有助于洞察其他星球上微生物新陈代谢的潜在形式，例如来自极地地区的寒冷土壤和沉积物、碱性和高盐度环境以及酸性矿山废水。这些研究预计将提出可用于评估地球或其他星球古代环境中是否存在铁(III)和腐殖质还原微生物的地球化学和/或生化特征。这些研究将大大增加我们对能够还原Fe(III)和腐殖质的微生物多样性的了解，并可能深入了解Fe(III)和外部有机电子受体在微生物呼吸作用进化中的潜在作用。此外，Fe(III)和腐殖质还原剂在环境恢复、贵金属回收和有价值矿物生产中的潜在应用表明，从极端环境中回收的Fe(III)和腐殖质还原剂可能具有经济价值。