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Rapid and highly effective bacteria-killing by polydopamine/IR780@MnO2–Ti using near-infrared light

Progress in Natural Science:Materials International 2020年第5期30卷 677-685页

作者： xingfu teng Xiangmei Liu Zhenduo Cui Yufeng Zheng Da-fu Chen Zhaoyang Li Yanqin Liang Shengli Zhu Shuilin Wu Hubei Key Laboratory of Polymer Materials Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials School of Materials Science & Engineering Hubei University The Key Laboratory of Advanced Ceramics and Machining Technology by the Ministry of Education of China School of Materials Science & Engineering Tianjin University State Key Laboratory for Turbulence and Complex System and Department of Materials Science and Engineering College of Engineering Peking University Beijing JiShuiTan Hospital Beijing Research Institute Orthopaedics & TraumatologyLab Bone Tissue Engineering

Bacterial infections are becoming a serious public health challenge because the abuse of antibiotics worldwide has caused bacterial resistance and the occurrence of superbugs. In this work, a new near-infrared(NIR) photoresponsive coating was constructed on Ti implant material, which was composed of Mn O2, IR780 photosensitizer and polydopamine(PDA). Under the irradiation of 808 nm NIR light, the component of Mn O2in the coating exhibited high photothermal performance, and IR780 could be stimulated to generate ROS as a photosensitizer. The addition of PDA not only improved the cytocompatibility of the composite coating but also strengthened the light absorption ability of the system. Under the irradiation of 808 nm NIR light for 15 min, the composite coating killed 99.94% Staphylococcus aureus and 99.89% Escherichia coli on Ti plates. This rapid and highly effective bactericidal rate was ascribed to the synergistic effects of photothermal performance and photodynamic effect of the coatings excited by NIR light. Cell culture tests showed that PDA/IR780@Mn O2–Ti had good cytocompatibility due to the excellent biocompatibility of PDA and nanostructured surface. Therefore,this surface system will be a very promising plateform to safely and effectively kill bacteria on biomedical devices and implants in a short time.

关键词： Antibacterial Photothermal Photocatalytic MnO2 Implant

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化学混凝法预处理农村生活污水

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四川冶金 2017年第5期39卷 68-73页

作者：王明斌吴勇古腾谢兴富王辉聂凯翔成都理工大学地质灾害防治与地质环境保护国家重点实验室四川成都610059 成都理工大学环境与土木工程学院四川成都610059

针对曝气生物滤池处理生活污水时除磷脱氮存在相互影响,以及产生大量活性污泥影响曝气生物滤池使用寿命的缺点。通过实验研究了氯化铁混凝剂不同添加量对生活污水预处理的效果,探讨了总磷(TP)、波长254nm处单位比色皿光程下的紫外吸光度... 详细信息

针对曝气生物滤池处理生活污水时除磷脱氮存在相互影响,以及产生大量活性污泥影响曝气生物滤池使用寿命的缺点。通过实验研究了氯化铁混凝剂不同添加量对生活污水预处理的效果,探讨了总磷(TP)、波长254nm处单位比色皿光程下的紫外吸光度(UV254)、浊度等去除的因素,并采用SMT提取法(Standard,Measurements and Testing)分析了混凝产生的沉淀中各形态磷含量及相互关系。水样分析结果表明:投药量为0.8mg·L-1时,出水水样的浊度、UV254和TP分别为4.70 NTU、0.184cm-1、0.031 mg·L-1,去除率分别为88.50%、73.73%、99.17%,铁含量为0.350 mg·L-1。SMT提取法分析结果表明,氯化铁混凝剂优先沉淀无机磷。

关键词：混凝剂预处理农村生活污水

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柏桦——二元向度的抒情策略——以《唯有旧日子带给我们幸福》为例

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岳阳职业技术学院学报 2007年第4期22卷 90-94页

作者：滕斌西南大学中国新诗研究所重庆北碚400715

柏桦的抒情是复杂的,在技巧上注重象征、暗示、兴的融合,节奏上体现为矜持、保守、软弱、温和的"慢节奏",并以时空上的对比、转折、切分句、肯定否定交织的回旋,以通感的方式展示内心挣扎的"客观化"过程。从等待的痛苦,对过去和现在的疑... 详细信息

柏桦的抒情是复杂的,在技巧上注重象征、暗示、兴的融合,节奏上体现为矜持、保守、软弱、温和的"慢节奏",并以时空上的对比、转折、切分句、肯定否定交织的回旋,以通感的方式展示内心挣扎的"客观化"过程。从等待的痛苦,对过去和现在的疑惑,以及暗示结果的疑问来展示"戏剧性冲突"后平和的沉思来组成"戏剧性结构"。意象上追求形象、声音、色彩的从"重"到"轻"的转换,在矛盾的推进中达到情、理、智的结合。

关键词：抒情慢二元向度策略

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