Resistance of extremely halophilic archaea to zinc and zinc oxide nanoparticles
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- 作者：Bhakti B. Salgaonkar ; Deepthi Das ; Judith Maria Bragança
- 关键词：Halophilic ; Archaea ; Halococcus strain BK6 ; Haloferax strain BBK2 ; Halorubrum strain BS17 ; Haloarcula strain BS2 ; ZnCl2 ; ZnO nanoparticles ; Metal tolerance ; Growth kinetics
- 刊名：Applied Nanoscience
- 出版年：2016
- 出版时间：February 2016
- 年：2016
- 卷：6
- 期：2
- 页码：251-258
- 全文大小：1,081 KB
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Deepthi Das (1)
Judith Maria Bragança (1)
1. Department of Biological Sciences, Birla Institute of Technology and Science Pilani, K K Birla, Goa Campus, NH 17B, Zuarinagar, 403 726, Goa, India - 刊物类别：Chemistry and Materials Science
- 刊物主题：Materials Science
Nanotechnology - 出版者：Springer Berlin / Heidelberg
- ISSN：2190-5517
文摘
Industrialization as well as other anthropogenic activities have resulted in addition of high loads of metal and/or metal nanoparticles to the environment. In this study, the effect of one of the widely used heavy metal, zinc (Zn) and zinc oxide nanoparticles (ZnO NPs) on extremely halophilic archaea was evaluated. One representative member from four genera namely Halococcus, Haloferax, Halorubrum and Haloarcula of the family Halobacteriaceae was taken as the model organism. All the haloarchaeal genera investigated were resistant to both ZnCl2 and ZnO NPs at varying concentrations. Halococcus strain BK6 and Haloferax strain BBK2 showed the highest resistance in complex/minimal medium of up to 2.0/1.0 mM ZnCl2 and 2.0/1.0–0.5 mM ZnO NP. Accumulation of ZnCl2/ZnO NPs was seen as Haloferax strain BBK2 (287.2/549.6 mg g−1) > Halococcus strain BK6 (165.9/388.5 mg g−1) > Haloarcula strain BS2 (93.2/28.5 mg g−1) > Halorubrum strain BS17 (29.9/16.2 mg g−1). Scanning electron microscopy and energy dispersive X-ray spectroscopy (SEM–EDX) analysis revealed that bulk ZnCl2 was sorbed at a higher concentration (21.77 %) on the cell surface of Haloferax strain BBK2 as compared to the ZnO NPs (14.89 %). Keywords Halophilic Archaea Halococcus strain BK6 Haloferax strain BBK2 Halorubrum strain BS17 Haloarcula strain BS2 ZnCl2 ZnO nanoparticles Metal tolerance Growth kinetics