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轴承钢等离子体基离子注碳复合改性层化学结构的研究
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作者 孙明仁 夏立芳 +4 位作者 吴培莲 孙跃 马欣新 张振信 李光 《宇航材料工艺》 CAS CSCD 北大核心 1998年第3期22-26,共5页
通过激光Raman光谱、X射线光电子谱(XPS)以及电阻和显微硬度的测试,研究了GCr15钢及镇钛GCr15钢试样经乙炔等离子基离子注入所得表面改性层的化学结构。结果表明:改性层呈类金刚石碳淀积层+界面混合层及类金刚石碳淀积层+C-Ti混... 通过激光Raman光谱、X射线光电子谱(XPS)以及电阻和显微硬度的测试,研究了GCr15钢及镇钛GCr15钢试样经乙炔等离子基离子注入所得表面改性层的化学结构。结果表明:改性层呈类金刚石碳淀积层+界面混合层及类金刚石碳淀积层+C-Ti混合层的复合改性层结构,在C-Ti混合层和界面混合层内既有C、Ti及C、Fe原子的混合,也有TiC及铁的碳化物形成。类金刚石碳层的硬度约为17~20GPa,与硬质含氢类金刚石碳膜的硬度相当。 展开更多
关键词 离子注入 碳膜 复合改性层 化学结构 轴承钢
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The Benefit Risk Assessment of Consumption of Marine Species Based on Benefit-Risk Analysis for Foods(BRAFO)-tiered Approach 被引量:5
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作者 GAO Yi Xiong ZHANG Hong Xia +6 位作者 LI Jing Guang ZHANG Lei YU Xin Wei HE Jia Lu SHANG Xiao Hong ZHAO Yun Feng WU Yong Ning 《Biomedical and Environmental Sciences》 SCIE CAS CSCD 2015年第4期243-252,共10页
Objective To assess the net health effect caused by the consumption of specific marine species based on Benefit-Risk Analysis for Foods (BRAFO)-tiered approach. Methods Twenty species were collected from the Zhousha... Objective To assess the net health effect caused by the consumption of specific marine species based on Benefit-Risk Analysis for Foods (BRAFO)-tiered approach. Methods Twenty species were collected from the Zhoushan Archipelago, China. Concentrations of n-3 long-chain polyunsaturated fatty acids, methyl mercury (MeHg), and dioxin-like compounds (DLCs) in the samples were analyzed for benefit risk assessment based on BRAFO-tiered approach. Results Based on the BRAFO-tiered approach, reference scenario (no intake) and alternative scenario (intake of specific species of 200 g/week) were determined. The exposure to MeHg/DLCs via alternative scenario of all studied species did not exceed provisional tolerable weekly/monthly intake. However, the adult population with high DLCs exposure in China would significantly exceed the upper limit of DLCs via an additional alternative scenario of some species such as Auxis thazard. The results of deterministic computation showed that alternative scenario of all studied species generated clear net beneficial effects on death prevention and child IQ gain. Conclusion The alternative scenario of all studied species could be recommended to population with average DLCs exposure, and the reference scenario of species with relatively high DLCs concentration could be recommended to population exposed to high DLCs. 展开更多
关键词 N-3 long-chain polyunsaturated fatty acid Methyl mercury dioxin-like compound Benefit-Risk Analysis for Foods (BRAFO) Benefit risk assessment
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二噁英及其类似物的雄激素干扰效应的虚拟筛选和分子动力学模拟
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作者 王瑜 陈双扣 +1 位作者 朱万宏 徐曦 《环境科学学报》 CAS CSCD 北大核心 2024年第3期468-478,共11页
二噁英作为典型的环境污染物引发的内分泌干扰效应威胁着人类的健康,为了快速发现潜在的对人体雄激素有干扰效应的二噁英类似物(Dioxin-like compounds,DLCs)并研究其干扰机制,采用基于分子对接的虚拟筛选研究方法,建立雄激素受体(AR)的... 二噁英作为典型的环境污染物引发的内分泌干扰效应威胁着人类的健康,为了快速发现潜在的对人体雄激素有干扰效应的二噁英类似物(Dioxin-like compounds,DLCs)并研究其干扰机制,采用基于分子对接的虚拟筛选研究方法,建立雄激素受体(AR)的3个靶点蛋白2AX6、1T7T和6ULB的分子对接模型,并通过Autodock Vina程序进行虚拟筛选方法学研究.结果表明,2AX6靶点蛋白模型对引起雄激素干扰效应的二噁英类物质具有较强的富集能力,基于该模型对ZINC数据库进行虚拟筛选发现8个DLCs与靶点蛋白结合能值低于阈值-24.27 kJ·moL^(-1),且与毒性最强的二噁英化合物TCDD的结构高度相似,毒性预测发现其均具有潜在的雄激素干扰效应,其中4个与AR受体有强的相互作用;分子动力学模拟(Molecular Dynamics,MD)研究表明,DLCs与2AX6靶点蛋白主要通过与Arg752和Gln711氨基酸残基形成氢键及其他氨基酸残基的疏水作用稳定结合,形成的复合物体系的均方根偏差(Root mean square deviation, RMSD)值最终稳定在0.11~0.13 nm,与TCDD的雄激素干扰效应作用机制相似.研究对快速筛选潜在的环境内分泌干扰物与毒性评估提供了有益的探索. 展开更多
关键词 二噁英 类二噁英物 雄激素干扰效应 虚拟筛选 分子动力学
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