NDLI: Effect of metal accumulation-associated oxidative stress on the combined toxicity of quantum dots with Cu(2+) to Bacillus subtilis.

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Effect of metal accumulation-associated oxidative stress on the combined toxicity of quantum dots with Cu(2+) to Bacillus subtilis.

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Effect of metal accumulation-associated oxidative stress on the combined toxicity of quantum dots with Cu(2+) to Bacillus subtilis.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Zhao, Jianhua Zhao, Yuxia Liu, Bo Zhong, Ken Yao, Hejin Lin, Kuangfei
Description	Author Affiliation: Zhao J ( School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China); Zhao Y ( School of Chemical Engineering, Huaihai Institute of technology, Lianyungang 222000, China.); Liu B ( School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China); Zhong K ( School of Chemical Engineering, Huaihai Institute of technology, Lianyungang 222000, China.); Yao H ( College of Chemical and Material Engineering, Quzhou University, Quzhou 324000, China.); Lin K ( School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China)
Abstract	Quantum dot (QD) nanoparticles can coexist with Cu(2+) in soil and can adsorb Cu(2+) entering into bacterial cells, thereby promoting cellular copper accumulation and enhancing the combined toxicity of these two chemicals. Toxicity test results on Bacillus subtilis showed that the addition of safe concentrations of MPA-CdTe QDs to Cu(2+) culture (levels under IC50 value) resulted in higher toxicity with about twofold reduction in cell viability and increased intracellular Cu content. ROS levels also increased by about 500%, and SOD activity was altered after QD addition. Treatment with Cu(2+) alone decreased the -amylase activity of B. subtilis by 8%-35%. This finding was not affected by QD addition. Moreover, increased cellular copper concentration as a result of QD addition enhanced toxicity primarily by producing superoxide anions. However, this phenomenon did not interrupt the physical-biological responses of soil microbes.
File Format	HTM / HTML
ISSN	13826689
Journal	Environmental Toxicology and Pharmacology
Volume Number	44
e-ISSN	18727077
Language	English
Publisher	Elsevier
Publisher Date	2016-06-01
Publisher Place	Netherlands
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Environmental Health Discipline Pharmacology
Content Type	Text
Resource Type	Article
Subject	Health, Toxicology and Mutagenesis Medicine Toxicology Pharmacology

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