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北京大学 [2]
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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.
Oxidizing, trapping and releasing nox over model manganese oxides in alternative lean-burn/fuel-rich atmospheres at low temperatures
期刊论文
Catalysis today, 2017, 卷号: 297, 页码: 27-35
作者:
Guo, Li-Hong
;
Guo, Li
;
Zhao, Dong-Yue
;
Gao, Zhong-Nan
;
Tian, Ye
收藏
  |  
浏览/下载:36/0
  |  
提交时间:2019/04/23
No oxidation
Nox trap
Nox release
Manganese oxides
Lean-burn
Low temperature
Oxidizing, trapping and releasing NOx over model manganese oxides in alternative lean-burn/fuel-rich atmospheres at low temperatures
期刊论文
CATALYSIS TODAY, 2017, 卷号: 297, 页码: 27-35
作者:
Zhang J(张静)
;
X.-G. Li
;
L.-R. Zheng
;
J. Zhang
;
T. Ding
收藏
  |  
浏览/下载:15/0
  |  
提交时间:2019/08/27
NO oxidation
NOx trap
NOx release
Manganese oxides
Lean-burn
Low temperature
Facile Coordination-Precipitation Route to Insoluble Metal Roussin's Black Salts for NIR-Responsive Release of NO for Anti-Metastasis
期刊论文
ACS Applied Materials and Interfaces, 2017, 卷号: Vol.9 No.42, 页码: 36473-36477
作者:
Chen, L.
;
He, Q.
;
Lei, M.
;
Xiong, L.
;
Shi, K.
收藏
  |  
浏览/下载:3/0
  |  
提交时间:2019/02/25
antimetastasis
controlled
release
gas
therapy
near
infrared
light
NO
donor
NO-releasing
molecules
Roussin's
black
salts
Scheduling of Stochastic Distributed Assembly Flowshop under Complex Constraints
其他
2016-01-01
Du, Xiying
;
Ji, Mengchen
;
Li, Zhengyang
;
Liu, Bo
收藏
  |  
浏览/下载:6/0
  |  
提交时间:2017/12/03
combinatorial optimization
distributed assembly permutation flowshop scheduling
memetic algorithm
particle swarm optimization
sequence dependent setup time
release time
stochastic
no-wait constraint
MEMETIC FRAMEWORK
OPTIMIZATION
ALGORITHMS
X-ray Radiation-Controlled NO-Release for On-Demand Depth-Independent Hypoxic Radiosensitization
期刊论文
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2015, 卷号: 54, 期号: 47, 页码: 14026-14030
作者:
Fan, Wenpei
;
Bu, Wenbo
;
Zhang, Zhen
;
Shen, Bo
;
Zhang, Hui
收藏
  |  
浏览/下载:28/0
  |  
提交时间:2016/08/15
hypoxic radiosensitization
luminescent imaging
NO release
on-demand therapy
X-ray radiation
Integrating novel chemical weapons and evolutionarily increased competitive ability in success of a tropical invader
期刊论文
NEW PHYTOLOGIST, 2015, 卷号: 205, 期号: 3, 页码: 1350-1359
Zheng, YL
;
Feng, YL
;
Zhang, LK
;
Callaway, RM
;
Valiente-Banuet, A
;
Luo, DQ
;
Liao, ZY
;
Lei, YB
;
Barclay, GF
;
Silva-Pereyra, C
收藏
  |  
浏览/下载:130/0
  |  
提交时间:2015/03/26
INVASIVE PLANT
CHROMOLAENA-ODORATA
CENTAUREA-MACULOSA
BIOLOGICAL-CONTROL
ENEMY RELEASE
NATIVE PLANTS
ROOT EXUDATE
NO EVIDENCE
RANGE
ALLELOPATHY
X-ray Radiation-Controlled NO-Release for On-Demand Depth-Independent Hypoxic Radiosensitization
期刊论文
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2015, 卷号: 54, 期号: 47
作者:
Fan, Wenpei
;
Bu, Wenbo
;
Zhang, Zhen
;
Shen, Bo
;
Zhang, Hui
收藏
  |  
浏览/下载:3/0
  |  
提交时间:2019/12/19
hypoxic radiosensitization
luminescent imaging
NO release
on-demand therapy
X-ray radiation
In vitro anti-inflammatory effects of diterpenoids and sesquiterpenoids from traditional Chinese medicine Siegesbeckia pubescens
期刊论文
BIOORGANIC & MEDICINAL CHEMISTRY LETTERS, 2014, 卷号: 24, 期号: 16, 页码: 3944-3947
作者:
Wang, R
;
Liu, YQ
;
Ha, W
;
Shi, YP
;
Hwang, TL
收藏
  |  
浏览/下载:2/0
  |  
提交时间:2015/12/29
Anti-inflammatory
Siegesbeckia pubescens
NO production
O-2(-) generation
Elastase release
Cytotoxicity
In vitro anti-inflammatory effects of diterpenoids and sesquiterpenoids from traditional Chinese medicine Siegesbeckia pubescens
期刊论文
Bioorganic & Medicinal Chemistry Letters, 2014, 卷号: 24, 期号: 16, 页码: 3944-3947
作者:
Wang R(王瑞)
;
Liu YQ(刘映前)
;
Ha W(哈伟)
;
Shi YP(师彦平)
;
Tsong-Long Hwang
收藏
  |  
浏览/下载:23/0
  |  
提交时间:2014/12/11
Anti-inflammatory
Siegesbeckia pubescens
NO production
O-2(-) generation
Elastase release
Cytotoxicity
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