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首页> 外文期刊>Environmental toxicology and chemistry >DELINEATING ION-ION INTERACTIONS BY ELECTROSTATIC MODELING FOR PREDICTING RHIZOTOXICITY OF METAL MIXTURES TO LETTUCE LACTUCA SATIVA
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DELINEATING ION-ION INTERACTIONS BY ELECTROSTATIC MODELING FOR PREDICTING RHIZOTOXICITY OF METAL MIXTURES TO LETTUCE LACTUCA SATIVA

机译：通过静电建模描绘离子相互作用，以预测金属混合物对莴苣乳杆菌的致根性

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摘要

Effects of ion-ion interactions on metal toxicity to lettuce Lactuca sativa were studied based on the electrical potential at the plasma membrane surface (Ψ_0). Surface interactions at the proximate outside of the membrane influenced ion activities at the plasma membrane surface ({M~(n+)}_0). At a given free Cu~(2+) activity in the bulk medium ({Cu~(2+)}_b), additions of Na~+, K~+, Ca~(2+), and Mg~(2+) resulted in substantial decreases in {Cu~(2+)}_0. Additions of Zn~(2+) led to declines in {Cu~(2+)}_0, but Cu~(2+) and Ag~+ at the exposure levels tested had negligible effects on the plasma membrane surface activity of each other. Metal toxicity was expressed by the {M~(n+)}_0-based strength coefficient, indicating a decrease of toxicity in the order: Ag~+ ＞ Cu~(2+) ＞ Zn~(2+). Adsorbed Na~+, K~+, Ca~(2+), and Mg~(2+) had significant and dose-dependent effects on Cu~(2+) toxicity in terms of osmolarity. Internal interactions between Cu~(2+) and Zn~(2+) and between Cu~(2+) and Ag~+ were modeled by expanding the strength coefficients in concentration addition and response multiplication models. These extended models consistently indicated that Zn~(2+) significantly alleviated Cu~(2+) toxicity. According to the extended concentration addition model, Ag~+ significantly enhanced Cu~(2+) toxicity whereas Cu~(2+) reduced Ag~+ toxicity. By contrast, the response multiplication model predicted insignificant effects of adsorbed Cu~(2+) and Ag~+ on the toxicity of each other. These interactions were interpreted using Ψ_0, demonstrating its influence on metal toxicity.
机译：基于质膜表面的电势（Ψ_0），研究了离子-离子相互作用对金属对莴苣的毒性的影响。膜附近外部的表面相互作用影响质膜表面的离子活性（{M〜（n +）} _ 0）。在本体介质（{Cu〜（2 +）} _ b）中给定的游离Cu〜（2+）活性下，添加了Na〜+，K〜+，Ca〜（2+）和Mg〜（2+ ）导致{Cu〜（2 +）} _ 0大幅下降。 Zn〜（2+）的添加导致{Cu〜（2 +）} _ 0的下降，但是在测试的暴露水平下Cu〜（2+）和Ag〜+对彼此的质膜表面活性的影响可忽略不计。金属毒性由基于{M〜（n +）} _ 0的强度系数表示，表明毒性降低的顺序为：Ag〜+＞ Cu〜（2+）＞ Zn〜（2+）。就渗透压而言，吸附的Na〜+，K〜+，Ca〜（2+）和Mg〜（2+）对Cu〜（2+）毒性具有显着的剂量依赖性。通过扩展浓度加和响应乘积模型中的强度系数，对Cu〜（2+）和Zn〜（2+）之间以及Cu〜（2+）和Ag〜+之间的内部相互作用进行建模。这些扩展模型一致表明，Zn〜（2+）显着减轻了Cu〜（2+）的毒性。根据扩展浓度添加模型，Ag〜+显着增强了Cu〜（2+）的毒性，而Cu〜（2+）降低了Ag〜+的毒性。相比之下，响应乘法模型预测吸附的Cu〜（2+）和Ag〜+对彼此毒性的影响不显着。使用Ψ_0解释了这些相互作用，证明了其对金属毒性的影响。

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  • 来源
    《Environmental toxicology and chemistry》 |2014年第9期|1988-1995|共8页
  • 作者

    T. T. Yen Le; Peng Wang; Martina G. Vijver; Thomas B. Kinraide; A. Jan Hendriks; Willie J.G.M. Peijnenburg;

  • 作者单位

    Department of Environmental Sciences, Institute for Water and Wetland Research, Radboud University Nijmegen, Nijmegen, the Netherlands,Laboratory for Ecological Risk Assessment, National Institute for Public Health and the Environment, Bilthoven, the Netherlands;

    School of Agriculture and Food Sciences, The University of Queensland, St Lucia, Queensland, Australia;

    Department of Conservation Biology, Institute of Environmental Sciences (CML), Leiden University, Leiden, the Netherlands;

    Agricultural Research Service, United States Department of Agriculture, Beaver, West Virginia;

    Department of Environmental Sciences, Institute for Water and Wetland Research, Radboud University Nijmegen, Nijmegen, the Netherlands;

    Laboratory for Ecological Risk Assessment, National Institute for Public Health and the Environment, Bilthoven, the Netherlands,Department of Conservation Biology, Institute of Environmental Sciences (CML), Leiden University, Leiden, the Netherlands;

  • 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

    Metal mixture; Model; Plant; Toxicity; Membrane surface; Interactions;

    机译：金属混合物;模型;厂;毒性;膜表面;互动互动;

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