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山东师范大学 [24]
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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.
Rational design of metalloenzymes: From single to multiple active sites
期刊论文
Coordination Chemistry Reviews, 2017, 卷号: 336, 期号: Volume 336, 页码: 1-27
作者:
Lin, Ying-Wu*
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浏览/下载:22/0
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提交时间:2019/12/27
UAAs
unnatural amino acids
Rd
rubredoxin
EPR
electron paramagnetic resonance
Az
azurin
SOR
superoxide reductase
PDB
protein data bank
6-PGLac
6-phosphogluconolactonase
H-bond
hydrogen-bond
NIR
nitrite reductase
ET
electron transfer
3SCC
three stranded coiled coil
Bpy-Ala
(2,2′-bipyridinine-5-yl)alanine
CcO
cytochrome c oxidase
N2OR
nitrous oxidase reductase
XANES
X-ray absorption near-edge structure
DF
Due Ferri
4-AP
4-amino-phenol
POP
prolyl oligopeptidase
ee
enantiomeric excess
HCO
heme-copper oxidase
NOR
nitric oxide reductase
MnP
manganese peroxidase
Mb
myoglobin
RFQ-rR
freeze-quench resonance Raman
CcP
Cyt c peroxidase
BMC
microcompartment
CYP
cytochrome P450
TON
turnover number
TDHC
tetradehydrocorrin
NB
nitrobindin
RCM
ring-closing metathesis
ROMP
ring-opening metathesis polymerization
SAV
steptavidin
NCS
neocarzinostatin
BLG
-Lactoglobulin
HSA
human serum albumin
BSA
bovine serum albumin
ITC
isothermal titration calorimetry
AldO
alditol oxidase
FAD
flavin adenine dinucleotide
MP
microperoxidase
HB
heme-binding
GTL
Geobacillus thermocatenulatus lipase
4NPA
4-nitrophenyl acetate
LmrR
Lactococcal multidrug resistance Regulator
ABTS
2,2′-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt
mCPBA
meta-chloroperbenzoic acid
Fd
ferredoxin
Fld
flavodoxin
HTHP
hexameric Tyr-coordinated heme protein
AFM
atomic force microscopy
TEM
transmission electron microscopy
MRI
magnetic resonance imaging
Metalloproteins
Metalloenzymes
Protein design
Multiple active sites
Biocatalysts
影响MP1和GMPR2基因在辽宁绒山羊皮肤中表达的研究
学位论文
: 辽宁师范大学, 2015
作者:
任竞羽
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  |  
浏览/下载:14/0
  |  
提交时间:2019/03/01
MP1
GMPR2
FGF5
Noggin
IGF-1
慢病毒
A phthalide derivative isolated from endophytic fungi Pestalotiopsis photiniae induces G1 cell cycle arrest and apoptosis in human HeLa cells
期刊论文
BRAZILIAN JOURNAL OF MEDICAL AND BIOLOGICAL RESEARCH, 2013, 卷号: 46, 期号: 8, 页码: 643-649
作者:
Chen, C.[1]
;
Yang, R. L.[2]
收藏
  |  
浏览/下载:3/0
  |  
提交时间:2019/12/21
MP [4-(3 '
3 '-dimethylallyloxy)-5-methyl-6-methoxyphthalide]
p73
Apoptosis
Adsorption of O Atom on Cr (100), (110), (111), and (211) Surfaces: An 5-Parameter Morse Potential Method Study
期刊论文
BULLETIN OF THE KOREAN CHEMICAL SOCIETY, 2012, 卷号: 33, 期号: 6, 页码: 1867-1872
作者:
Han, Ling-Li
;
Liu, Tao
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  |  
浏览/下载:2/0
  |  
提交时间:2019/12/23
O-Cr system
5-MP
Surfaces
Adsorption
Frequency
氧原子在金属银(211)(410) (997)台阶表面吸附和解离的理论研究
期刊论文
2012, 卷号: 27, 期号: 1, 页码: 85-88
作者:
刁兆玉[1]
;
高惠[1]
;
王泽新[1]
收藏
  |  
浏览/下载:5/0
  |  
提交时间:2020/01/07
5
-
MP方法
低频振动
吸附
MP5在医学多媒体教学中的应用与探讨
期刊论文
中华医学教育探索杂志, 2011, 卷号: 10, 期号: 8
作者:
王毅鹏
;
吕力
;
高玉碚
;
周宁
;
邢振芝
收藏
  |  
浏览/下载:3/0
  |  
提交时间:2019/12/04
多媒体教学
MP5
医学教育
教学新模式
以产气肠杆菌催化肌苷5′-位磷酸化的特性
期刊论文
2010, 2010
赵洪新
;
杨程
;
卢元
;
施瑢
;
来奇恒
;
邢新会
;
ZHAO Hongxin
;
YANG Cheng
;
LU Yuan
;
SHI Rong
;
LAI Qiheng
;
XING Xinhui
收藏
  |  
浏览/下载:2/0
The adsorption, vibration and diffusion of hydrogen atoms on platinum low-index surfaces
期刊论文
Journal of computational and theoretical nanoscience, 2009, 卷号: 6, 期号: 2, 页码: 439-448
作者:
Yu, Yanjie
;
Yang, Jin
;
Hao, Ce
;
Zhao, Xuefei
;
Wang, Zexin
收藏
  |  
浏览/下载:24/0
  |  
提交时间:2019/05/09
5-mp
H-pt system
Low-index surfaces
Missing-row reconstruction
Adsorption
Vibration
Subsurface adsorption
The Adsorption, Vibration and Diffusion of Hydrogen Atoms on Platinum Low-Index Surfaces
期刊论文
JOURNAL OF COMPUTATIONAL AND THEORETICAL NANOSCIENCE, 2009, 卷号: 6, 页码: 439-448
作者:
Yu, Yanjie
;
Yang, Jin
;
Hao, Ce
;
Zhao, Xuefei
;
Wang, Zexin
收藏
  |  
浏览/下载:2/0
  |  
提交时间:2019/12/24
5-MP
H-Pt System
Low-Index Surfaces
Missing-Row Reconstruction
Adsorption
Vibration
Subsurface Adsorption
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