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浏览/检索结果: 共41条，第1-10条 帮助

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Precise Ages of Field Stars from White Dwarf Companions in Gaia DR2 期刊论文  OAI收割
The Astrophysical Journal Supplement Series, 2021, 卷号: 253, 期号: 2
作者:  Qiu,Dan;  Tian,Hai-Jun;  Wang,Xi-Dong;  Nie,Jia-Lu;  Hippel,Ted von
  |  收藏  |  浏览/下载：21/0  |  提交时间：2021/12/06
食用蔬菜能吸收和积累微塑料 期刊论文  OAI收割
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：142/0  |  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.  
Synthesis of Eugenol-Based Silicon-Containing Benzoxazines and Their Applications as Bio-Based Organic Coatings 期刊论文  OAI收割
COATINGS, 2018, 卷号: 8, 期号: 3
作者:  
  |  收藏  |  浏览/下载：28/0  |  提交时间：2018/12/04
Synthesis of Biobased Benzoxazines Suitable for Vacuum-Assisted Resin Transfer Molding Process via Introduction of Soft Silicon Segment 期刊论文  OAI收割
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 2018, 卷号: 57, 期号: 8, 页码: 3091-3102
作者:  Zhu, Jin;  Dai, Jinyue;  Teng, Na;  Shen, Xiaobin;  Liu, Yuan
  |  收藏  |  浏览/下载：37/0  |  提交时间：2018/12/04
Energy efficiency decision and selection of main engines in a sustainable shipbuilding supply chain 期刊论文  OAI收割
TRANSPORTATION RESEARCH PART D-TRANSPORT AND ENVIRONMENT, 2017, 卷号: 53, 页码: 290-305
作者:  Xie, Gang;  Yue, Wuyi;  Wang, Shouyang
  |  收藏  |  浏览/下载：25/0  |  提交时间：2018/07/30
Cyclic olefin copolymers of propylene with asymmetric Si-containing alpha,omega-diolefins: The tailored thermal and mechanical properties 期刊论文  OAI收割
polymer, 2015, 卷号: 61, 期号: 11, 页码: 108-114
作者:  Wang,Bin;  Long,Ying-Yun;  Li,Yan-Guo;  Men,Yong-Feng;  Li,Yue-Sheng
收藏  |  浏览/下载：22/0  |  提交时间：2016/05/20
Synthesis of High-Triplet-Energy Host Polymer for Blue and White Electrophosphorescent Light-Emitting Diodes 期刊论文  OAI收割
MACROMOLECULES, 2014, 卷号: 47, 期号: 21, 页码: 7397-7406
作者:  Xu, Fei;  Kim, Ji-Hoon;  Kim, Hee Un;  Jang, Jae-Ho;  Yook, Kyoung Soo
收藏  |  浏览/下载：27/0  |  提交时间：2015/04/01
Cyclopolymerization of Si-Containing alpha,omega-Diolefins by a Pyridylamidohafnium Catalyst with High Cyclization Selectivity and Stereoselectivity 期刊论文  OAI收割
macromolecules, 2014, 卷号: 47, 期号: 19, 页码: 6627-6634
Wang, Bin; Wang, Yong-Xia; Cui, Jing; Long,Yingyun; Li,Yanguo; Yuan,Xiaoyan; Li,Yuesheng
收藏  |  浏览/下载：34/0  |  提交时间：2015/06/05
Extension of Molecular Structure toward Solution-Processable Hosts for Efficient Blue Phosphorescent Organic Light-Emitting Diodes 期刊论文  OAI收割
journal of physical chemistry c, 2013, 卷号: 117, 期号: 1, 页码: 549-555
Gong SL; Zhong C; Fu Q; Ma DG; Qin JG; Yang CL
收藏  |  浏览/下载：33/0  |  提交时间：2014/04/16
Tetraphenylsilane derivatives spiro-annulated by triphenylamine/carbazole with enhanced HOMO energy levels and glass transition temperatures without lowering triplet energy: host materials for efficient blue phosphorescent OLEDs 期刊论文  OAI收割
journal of materials chemistry c, 2013, 卷号: 1, 期号: 3, 页码: 463-469
Fan C; Chen YH; Liu ZY; Jiang ZQ; Zhong C; Ma DG; Qin JG; Yang CL
收藏  |  浏览/下载：27/0  |  提交时间：2014/04/18