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TESTING THE INDIVIDUAL EFFECTIVE DOSE HYPOTHESIS

机译:测试个人有效剂量假设

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摘要

The assumption of the individual effective dose is the basis for the probit method used for analyzing dose or concentration-response data. According to this assumption, each individual has a uniquely innate tolerance expressed as the individual effective dose (IED) or the smallest dose that is sufficient to kill the individual. An alternative to IED, stochasticity suggests that individuals do not have uniquely innate tolerance; deaths result from random processes occurring among similar individuals. Although the probit method has been used extensively in toxicology, the underlying assumption has not been tested rigorously. The goal of the present study was to test which assumption, IED or stochasticity, best explained the response of Daphnia magna exposed to multiple pulses of copper sulfate (CuSO_4) over 24 d. Daphnia magna were exposed to subsequent age-dependent 24-h median lethal concentrations (LC50s) of copper (Cu). Age-dependent 24-h LC50 values and Cu depuration test were determined prior to the 24-d bioassay. The LC50 values were inversely related to organism age. The Cu depuration of D. magna did not depend on age or Cu concentration, and 5 d was sufficient recovery time. Daphnia magna were exposed to 4 24-h Cu exposures, and surviving organisms after each exposure were transferred to Cu-free culture media for recovery before the next exposure. Stochasticity appropriately explained the survival and reproduction response of D. magna exposed to Cu.
机译:假定单个有效剂量是用于分析剂量或浓度响应数据的概率方法的基础。根据此假设,每个个体都有一个独特的先天耐受性,表示为个体有效剂量(IED)或足以杀死该个体的最小剂量。随机性是IED的另一种选择,它表明个体没有独特的先天宽容。死亡是由相似个体之间发生的随机过程导致的。尽管概率论方法已在毒理学中广泛使用,但尚未对基础假设进行严格的测试。本研究的目的是测试哪种假设(IED或随机性)能最好地解释24天内暴露于多脉冲硫酸铜(CuSO_4)的水蚤的反应。大型蚤(Daphnia magna)随后暴露于年龄依赖性的24小时铜(Cu)致死浓度中值(LC50s)。在进行24天生物测定之前,确定了年龄相关的24小时LC50值和铜净化测试。 LC50值与生物体年龄成反比。 D. magna的铜净化与年龄或Cu浓度无关,5 d即可恢复。大型蚤(Daphnia magna)暴露于4 24小时的铜暴露,每次暴露后存活的生物被转移到无铜的培养基中以恢复下一次暴露。随机性适当地解释了暴露于铜的D. magna的存活和繁殖反应。

著录项

  • 来源
    《Environmental toxicology and chemistry》 |2014年第4期|791-797|共7页
  • 作者

    Hung T. Vu; Stephen J. Klaine;

  • 作者单位

    Clemson University, Department of Biological Sciences, Institute of Environmental Toxicology, Pendleton, South Carolina, USA,Department of Zoology, The University of Melbourne, Parkville, Victoria, Australia;

    Clemson University, Department of Biological Sciences, Institute of Environmental Toxicology, Pendleton, South Carolina, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    IED; Stochastic; Aquatic Invertebrates; Copper; Toxic Effects;

    机译:简易爆炸装置;随机;水生无脊椎动物;铜;毒性作用;

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