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食用蔬菜能吸收和积累微塑料 期刊论文
科学通报, 2019, 卷号: 64, 期号: 9, 页码: 928-934
作者:  李连祯;  周倩;  尹娜;  涂晨;  骆永明
收藏  |  浏览/下载：63/0  |  提交时间：2020/06/17
微塑料  生菜  聚苯乙烯微球  吸收  积累  健康风险  microplastics  lettuce  polystyrene microbeads  uptake  accumulation  human health risk  Microplastic (MP, 100 nm-5 mm) may present an attributable risk to ecosystem and human health, and its pollution has become a global environmental concern. Despite a wealth of information on the accumulation of MPs in aquatic species, there is no information on the uptake and accumulation of MPs by higher plants. Terrestrial edible plants are directly exposed to MPs when agricultural soil was applied with organic manure, sewage sludge as fertilizer or plastic mulching. In this paper, the uptake of two sizes of polystyrene (PS) microbeads (0.2 and 1.0 mum) and then their distribution and migration in an edible plant lettuce were firstly investigated based on laboratory experiments. We used fluorescent markers to track PS microbeads in plant tissues and found fluorescence to be a sensitive and reliable detection method. Sections from untreated control lettuce showed no autofluorescence. When roots were treated with fluorescently labeled PS microbeads, the microbeads could be identified by its fluorescence. Our main study investigated the uptake of 0.2 mum beads, as few luminescence signals were observed in lettuce roots for 1.0 mum beads in our experiment. We observed that 0.2 mum fluorescent microbeads were extracellularly trapped in the root cap mucilage (which is a highly hydrated polysaccharide) and a dark green tip (which was typical of lettuce roots exposed to label PS beads) was usually visible to the naked eye. Confocal images revealed that the PS luminescence signals were mainly located in the vascular system and on the cell walls of the cortex tissue of the roots, indicated that the beads passed through the intercellular space via the apoplastic transport system. Once inside the central cylinder, the 0.2 mum PS beads were transferred from the roots to the stems and leaves via the vascular system following the transpiration stream. We also observed that the PS beads adhered to one another and self-assembled systematically into grape-like and (chain) string-like clusters in the intercellular space of the root and stem vascular tissue of lettuce plant. In contrast to the root and stem, PS beads were dispersed in the leaf tissue. Here, for the first time we provide evidence of the adherence, uptake, accumulation, and translocation of submicrometer MPs within an edible plant. Our findings highlight the previously underappreciated human exposure pathway to MPs through the consumption of contaminated crops and emphasize the need for new management strategies to control the release of MPs waste products into the terrestrial environment. Ultimately, the potential impacts of low range sized MPs on food safety of crop plants and human health need to be urgently considered.  
Simulation analysis of ion thruster plume thermal effect [离子推力器羽流热效应仿真分析] 期刊论文
Beijing Hangkong Hangtian Daxue Xuebao/Journal of Beijing University of Aeronautics and Astronautics, 2018, 卷号: 44, 页码: 2028-2034
作者:  Zhang, J.;  Li, J.;  You, F.;  Zheng, H.
收藏  |  浏览/下载：14/0  |  提交时间：2019/12/30
A new scalable software package for large scale beam dynamic simulations 会议论文
Shanghai, China, May 12, 2013 - May 17, 2013
作者:  Li, Ch.;  Yang, L.;  He, Y.;  Zhao, R.;  Xu, J.
收藏  |  浏览/下载：18/0  |  提交时间：2016/03/29
基于PIC方法的二维束流动力学模拟程序及其初步应用 期刊论文
2010, 2010
杨建俊; 张天爵; 安世忠; 贾先禄; 林郁正; YANG Jian-Jun; ZHANG Tian-Jue; AN Shi-Zhong; JIA Xian-Lu; LIN Yu-Zheng
收藏  |  浏览/下载：4/0
PIC方法在RFQ加速器z-code和t-code模拟程序中的应用研究 期刊论文
2010, 2010
邢庆子; 林郁正; 傅世年; XING Qingzi; LIN Yuzheng; FU Shinian
收藏  |  浏览/下载：4/0
Research and construction of flexible real time simulation platform for electric vehicle based on PC cluster 期刊论文
2010, 2010
Qi Zhanning; Chen Quanshi; Liang Weiming; Ge Jun; Tian Guangyu
收藏  |  浏览/下载：4/0
A two-dimension beam dynamics simulation code base on PIC method 期刊论文
2010, 2010
Yang Jian-Jun; Zhang Tian-Jue; An Shi-Zhong; Jia Xian-Lu; Lin Yu-Zheng
收藏  |  浏览/下载：4/0
Application of PIC method for z-code and t-code simulation in RFQ accelerators 期刊论文
2010, 2010
Xing Qingzi; Lin Yuzheng; Fu Shinian
收藏  |  浏览/下载：6/0
基于区间二型模糊方法的词计算和语言动力学系统研究 学位论文
工学博士, 中国科学院自动化研究所: 中国科学院研究生院, 2009
作者:  赵亮
收藏  |  浏览/下载：53/0  |  提交时间：2015/09/02
Sound transmission through lightweight metallic sandwich panel with corrugated core 期刊论文
Shengxue Xuebao/Acta Acustica, 2008, 卷号: 33, 期号: 4, 页码: 340-347
作者:  Xin, Fengxian;  Lu, Tianjian;  Chen, Changqing
收藏  |  浏览/下载：6/0  |  提交时间：2019/12/18

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