دورية أكاديمية
Biosorption of metal elements by exopolymer nanofibrils excreted from Leptothrix cells.
| العنوان: | Biosorption of metal elements by exopolymer nanofibrils excreted from Leptothrix cells. |
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| المؤلفون: | Kunoh T; Core Research for Evolutionary Science and Technology (CREST), Japan Science and Technology Agency (JST), Okayama 700-8530, Japan; Graduate School of Natural Science and Technology, Okayama University, Okayama, 700-8530, Japan., Nakanishi M; Core Research for Evolutionary Science and Technology (CREST), Japan Science and Technology Agency (JST), Okayama 700-8530, Japan; Graduate School of Natural Science and Technology, Okayama University, Okayama, 700-8530, Japan., Kusano Y; Department of Applied Chemistry and Biotechnology, Okayama University of Science, Okayama, 700-0005, Japan., Itadani A; Department of Human Sciences, Obihiro University of Agriculture and Veterinary Medicine, Hokkaido, 080-8555, Japan; Graduate School of Science and Technology, Niigata University, Niigata, 950-2181, Japan., Ando K; Graduate School of Science and Technology, Niigata University, Niigata, 950-2181, Japan., Matsumoto S; Core Research for Evolutionary Science and Technology (CREST), Japan Science and Technology Agency (JST), Okayama 700-8530, Japan; Graduate School of Natural Science and Technology, Okayama University, Okayama, 700-8530, Japan., Tamura K; Core Research for Evolutionary Science and Technology (CREST), Japan Science and Technology Agency (JST), Okayama 700-8530, Japan; Graduate School of Natural Science and Technology, Okayama University, Okayama, 700-8530, Japan., Kunoh H; Core Research for Evolutionary Science and Technology (CREST), Japan Science and Technology Agency (JST), Okayama 700-8530, Japan; Graduate School of Natural Science and Technology, Okayama University, Okayama, 700-8530, Japan., Takada J; Core Research for Evolutionary Science and Technology (CREST), Japan Science and Technology Agency (JST), Okayama 700-8530, Japan; Graduate School of Natural Science and Technology, Okayama University, Okayama, 700-8530, Japan. Electronic address: jtakada@cc.okayama-u.ac.jp. |
| المصدر: | Water research [Water Res] 2017 Oct 01; Vol. 122, pp. 139-147. Date of Electronic Publication: 2017 May 04. |
| نوع المنشور: | Journal Article |
| اللغة: | English |
| بيانات الدورية: | Publisher: Pergamon Press Country of Publication: England NLM ID: 0105072 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1879-2448 (Electronic) Linking ISSN: 00431354 NLM ISO Abbreviation: Water Res Subsets: MEDLINE |
| أسماء مطبوعة: | Original Publication: Oxford, Pergamon Press. |
| مواضيع طبية MeSH: | Leptothrix* , Metals*, Iron ; Spectrometry, X-Ray Emission ; X-Ray Diffraction |
| مستخلص: | Leptothrix species, aquatic Fe-oxidizing bacteria, excrete nano-scaled exopolymer fibrils. Once excreted, the fibrils weave together and coalesce to form extracellular, microtubular, immature sheaths encasing catenulate cells of Leptothrix. The immature sheaths, composed of aggregated nanofibrils with a homogeneous-looking matrix, attract and bind aqueous-phase inorganics, especially Fe, P, and Si, to form seemingly solid, mature sheaths of a hybrid organic-inorganic nature. To verify our assumption that the organic skeleton of the sheaths might sorb a broad range of other metallic and nonmetallic elements, we examined the sorption potential of chemically and enzymatically prepared protein-free organic sheath remnants for 47 available elements. The sheath remnants were found by XRF to sorb each of the 47 elements, although their sorption degree varied among the elements: >35% atomic percentages for Ti, Y, Zr, Ru, Rh, Ag, and Au. Electron microscopy, energy dispersive x-ray spectroscopy, electron and x-ray diffractions, and Fourier transform infrared spectroscopy analyses of sheath remnants that had sorbed Ag, Cu, and Pt revealed that (i) the sheath remnants comprised a 5-10 nm thick aggregation of fibrils, (ii) the test elements were distributed almost homogeneously throughout the fibrillar aggregate, (iii) the nanofibril matrix sorbing the elements was nearly amorphous, and (iv) these elements plausibly were bound to the matrix by ionic binding, especially via OH. The present results show that the constitutive protein-free exopolymer nanofibrils of the sheaths can contribute to creating novel filtering materials for recovering and recycling useful and/or hazardous elements from the environment. (Copyright © 2017. Published by Elsevier Ltd.) |
| فهرسة مساهمة: | Keywords: Amorphous organic–inorganic complex; Biosorption; Exopolymer fibrils; Leptothrix; Sheath materials; Sorbed metal elements |
| المشرفين على المادة: | 0 (Metals) E1UOL152H7 (Iron) |
| تواريخ الأحداث: | Date Created: 20170610 Date Completed: 20171013 Latest Revision: 20181202 |
| رمز التحديث: | 20221213 |
| DOI: | 10.1016/j.watres.2017.05.003 |
| PMID: | 28599159 |
| قاعدة البيانات: | MEDLINE |
Full Text Finder | تدمد: | 1879-2448 |
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| DOI: | 10.1016/j.watres.2017.05.003 |