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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
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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.
Design of Aviation Power Supply Test Information Management and Reporting Automatic Generation System
会议论文
Proceedings of 2018 IEEE 3rd Advanced Information Technology, Electronic and Automation Control Conference, IAEAC 2018
作者:
Xia, J.
;
Wang, C.
;
He, J.
;
Geng, C.
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浏览/下载:6/0
  |  
提交时间:2019/12/30
Automation
Cesium
Data fusion
Data handling
Data recording
Database systems
Fighter aircraft
System stability
Automatic Generation
Implementation effects
NET platform
Power supply
Process tests
Test reports
the. Net
Word - API
Information management
某县共青团基层组织数据管理系统的设计与实现
学位论文
2016, 2016
奚颖峰
收藏
  |  
浏览/下载:2/0
  |  
提交时间:2017/06/20
共青团组织
数据管理
信息系统
The Communist Youth League
Data management
Information System
某高校学生成绩管理系统的设计与实现
学位论文
2016, 2016
刘米江
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  |  
浏览/下载:7/0
  |  
提交时间:2017/06/20
MySQL数据库
管理信息系统
Apache Web服务器
MySQL Database
The Management Information System
Apache Web
邮政储蓄银行信贷档案管理信息系统的设计与实现
学位论文
2016, 2015
范露莹
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  |  
浏览/下载:4/0
  |  
提交时间:2017/06/20
邮储银行
信贷档案
管理信息系统
The Postal Savings Bank
Credit Archives
Management Information System
东瓯文化创意园中视频监控管理系统的设计与实现
学位论文
2016, 2015
颜雪秋
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  |  
浏览/下载:5/0
  |  
提交时间:2017/06/20
视频监控
门店安防
信息管理
Camera-Surveillance, Security of the Sailing Store, Information Management System
Business network information ecological chain.
期刊论文
Internet Research, 2016, 卷号: Vol.26 No.2, 页码: 446-459
作者:
Xu, Xiaojun
;
He, Wu
;
Yin, Ping
;
Xu, Xiaobo
;
Wang, Yuting
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  |  
浏览/下载:2/0
  |  
提交时间:2019/02/27
Business
network
Information
ecological
chain
Information
management
Structure
model
System
theories
The
Internet
of
Things
民政救助系统的设计与实现
学位论文
2015, 2014
王渊
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  |  
浏览/下载:2/0
  |  
提交时间:2016/01/12
民政救助:管理信息系统:B/S三层机构
Civil administration relief
The management information system
B/S three-tier structure
基于三维模型的工艺资源管理系统设计与实现
学位论文
2015, 2014
吴光平
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  |  
浏览/下载:1/0
  |  
提交时间:2016/01/12
三维模型
工艺资源管理
系统集成
Three-information model
Process Resource Management
The software system integration
南宁某老年公寓信息管理系统设计与实现
学位论文
2015, 2014
支桂衡
收藏
  |  
浏览/下载:2/0
  |  
提交时间:2016/01/12
老年公寓
C#
信息管理系统
Apartments for the Elderly
C#
Information Management System
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