[2] Univ Canberra, EcoChem, Canberra, ACT, Australia
[3] Inst Geol & Nucl Sci, Extremophiles Res Grp, Wairakei, New Zealand
[4] Harvard Sch Publ Hlth, Boston, MA USA
来源:
UNDERSTANDING THE GEOLOGICAL AND MEDICAL INTERFACE OF ARSENIC, AS 2012
|
2012年
关键词:
WATERS;
D O I:
暂无
中图分类号:
X [环境科学、安全科学];
学科分类号:
08 ;
0830 ;
摘要:
Early life on Earth had to cope with heat, acidity and high dissolved metal(loid) concentrations. Arsenic (As) is one metalloid enriched in geothermal waters. In order to survive toxic arsenic levels, microorganisms developed arsenic resistance mechanisms for arsenic species present at that time. Modern hot springs provide an analog to early Earth conditions in terms of temperature and dissolved arsenic concentrations. The nucleic acid data suggest a hyperthermophilic root of life, which supports the hypothesis of hot springs providing ideal conditions to investigate the evolution of microbial arsenic resistance. Geothermal pools in Wai-O-Tapu, New Zealand, with different temperature, pH and redox condition were studied for their arsenic speciation and microbial diversity. On an Eh-pH diagram, all pools plotted within the arsenite (H3AsO3) stability field. Alongside arsenite, however, HPLC-ICPMS analyses also detected arsenate, organic arsenic and unknown arsenic species, suggesting active microbial transformation of As[III] via one or more arsenic resistance mechanisms.
机构:
Univ Western Australia, Sch Earth & Geog Sci, Nedlands, WA 6009, AustraliaUniv Western Australia, Sch Earth & Geog Sci, Nedlands, WA 6009, Australia
Quaghebeur, M
Rengel, Z
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机构:
Univ Western Australia, Sch Earth & Geog Sci, Nedlands, WA 6009, AustraliaUniv Western Australia, Sch Earth & Geog Sci, Nedlands, WA 6009, Australia