CORC

浏览/检索结果: 共41条,第1-10条 帮助

已选(0)清除 条数/页:   排序方式:
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*
收藏  |  浏览/下载:22/0  |  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
收藏  |  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
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
收藏  |  浏览/下载:2/0  |  提交时间:2019/12/23
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
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
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


©版权所有 ©2017 CSpace - Powered by CSpace