2009 Fiscal Year Final Research Report
REE pattern as a signature of bacterial activities
| Project/Area Number |
19340168
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Geochemistry/Astrochemistry
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| Research Institution | Hiroshima University |
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Principal Investigator |
TAKAHASHI Yoshio Hiroshima University, 大学院・理学研究科, 教授 (10304396)
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| Co-Investigator(Kenkyū-buntansha) |
KANO Akihiro 九州大学, 大学院・比較社会文化研究院, 教授 (60231263)
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| Project Period (FY) |
2007 – 2009
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| Keywords | バクテリア / 希土類元素 / 吸着 / 細胞壁 / バイオフィルム / リン酸基 / カルボキシル基 / 広域X線吸収微細構造 |
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| Research Abstract |
We found that anomalous enrichment of heavy rare earth elements (REE) was observed in REE distribution patterns on various bacterial species. The enrichment is caused by complexation with multiple phosphate complexes, the contribution of which decreased with the increase in pH due to the larger contribution of carboxylate site. Similar HREE enrichment characteristic was found for REE pattern of biofilm and biogenic iron oxides formed in natural waters and also in Precambrian banded iron oxide formation (BIF). These results showed that HREE enrichment in REE pattern can be a signature of bacterial activities in natural systems and in sedimentary records.
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