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题名: Toxicological effects of nanometer titanium dioxide (nano-TiO2) on Chlamydomonas reinhardtii
作者: Chen, Lanzhou1, 2; Zhou, Lina2; Liu, Yongding1; Deng, Songqiang2; Wu, Hao2; Wang, Gaohong1
通讯作者: Wang, GH (reprint author), Chinese Acad Sci, Inst Hydrobiol, State Key Lab Fresh Water Ecol & Biotechnol, Wuhan 430072, Hubei, Peoples R China.
关键词: Nanometer titanium dioxide ; Chlamydomonas reinhardtii ; Physiological responses ; Toxicological effects ; Electron microscopy
刊名: ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
发表日期: 2012-10-01
DOI: 10.1016/j.ecoenv.2012.07.019
卷: 84, 页:155-162
收录类别: SCI
文章类型: Article
部门归属: [Chen, Lanzhou; Liu, Yongding; Wang, Gaohong] Chinese Acad Sci, Inst Hydrobiol, State Key Lab Fresh Water Ecol & Biotechnol, Wuhan 430072, Hubei, Peoples R China; [Chen, Lanzhou; Zhou, Lina; Deng, Songqiang; Wu, Hao] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430079, Peoples R China
WOS标题词: Science & Technology ; Life Sciences & Biomedicine
资助者: Chinese Natural Science Foundation [30970688, 30970446]; National Major Programs of Water Body Pollution Control and Remediation [2009ZX07103-006, 2009ZX07104-005-02, 2008ZX07105-005]; Project of Chinese Manned Spaceflight
类目[WOS]: Environmental Sciences ; Toxicology
研究领域[WOS]: Environmental Sciences & Ecology ; Toxicology
摘要: The toxicological effects of nanometer titanium dioxide (nano-TiO2) on a unicellular green alga Chlamydomonas reinhardtii were assessed by investigating the changes of the physiology and cyto-ultrastructure of this species under treatment. We found that nano-TiO2 inhibited photosynthetic efficiency and cell growth, but the content of chlorophyll a content in algae did not change, while carotenoid and chlorophyll b contents increased. Malondialdehyde (MDA) content reached maximum values after 8 h exposure and then decreased to a moderately low level at 72 h. Electron microscopy images indicated that as concentrations of nano-TiO2 increased, a large number of C. reinhardtii cells were noted to be damaged: the number of chloroplasts declined, various other organelles were degraded, plasmolysis occurred, and TiO2 nanoparticles were found to be located inside cell wall and membrane. It was also noted that cell surface was surrounded by TiO2 particles, which could present an obstacle to the exchange of substances between the cell and its surrounding environment. To sum up, the effect of nano-TiO2 on C. reinhardtii included cell surface aggregation, photosynthesis inhibition, lipid peroxidation and new protein synthesis, while the response of C. reinhardtii to nano-TiO2 was a rapid process which occurs during 24 h after exposing and may relate to physiological stress system to mitigate damage. Crown Copyright (C) 2012 Published by Elsevier Inc. All rights reserved.
英文摘要: The toxicological effects of nanometer titanium dioxide (nano-TiO2) on a unicellular green alga Chlamydomonas reinhardtii were assessed by investigating the changes of the physiology and cyto-ultrastructure of this species under treatment. We found that nano-TiO2 inhibited photosynthetic efficiency and cell growth, but the content of chlorophyll a content in algae did not change, while carotenoid and chlorophyll b contents increased. Malondialdehyde (MDA) content reached maximum values after 8 h exposure and then decreased to a moderately low level at 72 h. Electron microscopy images indicated that as concentrations of nano-TiO2 increased, a large number of C. reinhardtii cells were noted to be damaged: the number of chloroplasts declined, various other organelles were degraded, plasmolysis occurred, and TiO2 nanoparticles were found to be located inside cell wall and membrane. It was also noted that cell surface was surrounded by TiO2 particles, which could present an obstacle to the exchange of substances between the cell and its surrounding environment. To sum up, the effect of nano-TiO2 on C. reinhardtii included cell surface aggregation, photosynthesis inhibition, lipid peroxidation and new protein synthesis, while the response of C. reinhardtii to nano-TiO2 was a rapid process which occurs during 24 h after exposing and may relate to physiological stress system to mitigate damage. Crown Copyright (C) 2012 Published by Elsevier Inc. All rights reserved.
关键词[WOS]: CYANOBACTERIUM NOSTOC SP ; FRESH-WATER ; PSEUDOKIRCHNERIELLA-SUBCAPITATA ; SILVER NANOPARTICLES ; DUNALIELLA-TERTIOLECTA ; OXIDATIVE DAMAGE ; TIO2 PARTICLES ; GREEN-ALGAE ; TOXICITY ; NANOMATERIALS
语种: 英语
WOS记录号: WOS:000308771900022
ISSN号: 0147-6513
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/342005/17252
Appears in Collections:水环境工程研究中心_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Hydrobiol, State Key Lab Fresh Water Ecol & Biotechnol, Wuhan 430072, Hubei, Peoples R China
2.Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430079, Peoples R China

Recommended Citation:
Chen, Lanzhou; Zhou, Lina; Liu, Yongding; Deng, Songqiang; Wu, Hao; Wang, Gaohong.Toxicological effects of nanometer titanium dioxide (nano-TiO2) on Chlamydomonas reinhardtii,ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY,2012,84():155-162
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