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首页> 外文期刊>Environmental toxicology and chemistry >BEHAVIOR OF LEAD IN A MODEL MICROBIAL PREDATOR-PREY SYSTEM
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BEHAVIOR OF LEAD IN A MODEL MICROBIAL PREDATOR-PREY SYSTEM

机译：模型微生物捕食-收获系统中铅的行为

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Predation at the microbial level can affect the fate of toxic trace metals. Metals associated with bacterial prey can be released into the dissolved phase following digestion by a predator, and/or metals can remain in the predator and be transferred potentially to the next level of the food chain. Toxic metal ions in the aqueous phase also are expected to modify the growth and predation rate of a microbial predator. A model predator—prey system was developed to test the effects of Pb on cells and to help elucidate the fate of Pb in this type of interaction. Established methods that have been shown to be suitable for distinguishing dissolved, prey-bound, predator-bound, and ingested Pb were used to establish the pathway of Pb over time. Growth parameters were measured using batch reactors for the protozoan predator Tetrahymena thermophila and the bacterial prey Pseudomonas putida without Pb and at several concentrations of Pb. The effect of prey density on predation and Pb phase distribution also was investigated. Results demonstrate that some kinetic parameters related to prey consumption and growth of T. thermophila are altered by Pb. Upon addition of predator to prey cells in equilibrium with dissolved Pb, dissolved and prey-bound Pb become associated with the predator through ingestion and adsorption. Ingested Pb is excreted later as a bound metal associated with T. thermophila waste matter. A preliminary mathematical model was developed to describe predator—prey dynamics and their influence on the behavior and fate of Pb. Growth data were used to obtain model parameters, and model simulations for Pb fractionation are compared to experimental observations.
机译：微生物水平的捕食会影响有毒微量金属的命运。与细菌猎物相关的金属可在被捕食者消化后释放到溶解相中，和/或金属可保留在捕食者中并可能转移到食物链的下一个层次。还预期水相中的有毒金属离子会改变微生物捕食者的生长和捕食速度。开发了一个模型捕食者-猎物系统来测试Pb对细胞的作用，并帮助阐明这种相互作用中Pb的命运。已建立的方法被证明适用于区分溶解的，捕食的，捕食者的和摄入的铅，这些方法被用来建立铅在一段时间内的传播途径。使用分批反应器，对原生动物捕食性嗜热四膜膜虫和细菌捕食假单胞菌假单胞菌（Pseudomonas putida）在无铅和几种铅浓度的条件下，测量了生长参数。还研究了猎物密度对捕食和Pb相分布的影响。结果表明，Pb改变了与嗜热毁丝菌捕食和生长相关的一些动力学参数。将捕食者添加到与溶解的Pb处于平衡状态的捕食细胞中后，溶解的和被捕食者结合的Pb通过食入和吸附与捕食者相关。摄入的铅后来作为与嗜热毁丝菌废物相关的结合金属排泄。建立了一个初步的数学模型来描述捕食者-被捕食的动力学及其对铅的行为和命运的影响。使用生长数据获得模型参数，并将铅分离的模型模拟与实验观察结果进行比较。

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