Biomethylation and Volatilization of Arsenic by Model Protozoan Tetrahymena pyriformis under Different Phosphate Regimes

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	Biomethylation and Volatilization of Arsenic by Model Protozoan Tetrahymena pyriformis under Different Phosphate Regimes
	Yin, Xixiang; Wang, Lihong; Zhang, Zhanchao; Fan, Guolan; Liu, Jianjun; Sun, Kaizhen; Sun, Guo-Xin
刊名	INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
	2017-02-01
卷号	14 期号:2 页码:-
关键词	Arsenic Accumulation Biotransformation Phosphate Protozoan Tetrahymena Pyriformis
英文摘要	Tetrahymena pyriformis, a freshwater protozoan, is common in aquatic systems. Arsenic detoxification through biotransformation by T. pyriformis is important but poorly understood. Arsenic metabolic pathways (including cellular accumulation, effluxion, biomethylation, and volatilization) of T. pyriformis were investigated at various phosphate concentrations. The total intracellular As concentration increased markedly as the external phosphate concentration decreased. The highest concentration was 168.8 mgkg(-1) dry weight, after exposure to As(V) for 20 h. Inorganic As was dominant at low phosphate concentrations (3, 6, and 15 mgL(-1)), but the concentration was much lower at 30 mgL(-1) phosphate, and As(V) contributed only similar to 7% of total cellular As. Methylated As contributed 84% of total As at 30 mgL(-1) phosphate, and dimethylarsenate (DMAs(V)) was dominant, contributing up to 48% of total As. Cellular As effluxion was detected, including inorganic As(III), methylarsenate (MAs(V)) and DMAs(V). Volatile As was determined at various phosphate concentrations in the medium. All methylated As concentrations (intracellular, extracellular, and volatilized) had significant linear positive relationships with the initial phosphate concentration. To the best of our knowledge, this is the first study of As biotransformation by protozoa at different phosphate concentrations.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/38961]
专题	生态环境研究中心_城市与区域生态国家重点实验室
推荐引用方式 GB/T 7714	Yin, Xixiang,Wang, Lihong,Zhang, Zhanchao,et al. Biomethylation and Volatilization of Arsenic by Model Protozoan Tetrahymena pyriformis under Different Phosphate Regimes[J]. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH,2017,14(2):-.
APA	Yin, Xixiang.,Wang, Lihong.,Zhang, Zhanchao.,Fan, Guolan.,Liu, Jianjun.,...&Sun, Guo-Xin.(2017).Biomethylation and Volatilization of Arsenic by Model Protozoan Tetrahymena pyriformis under Different Phosphate Regimes.INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH,14(2),-.
MLA	Yin, Xixiang,et al."Biomethylation and Volatilization of Arsenic by Model Protozoan Tetrahymena pyriformis under Different Phosphate Regimes".INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 14.2(2017):-.