纳米载银室温固化型PMMA材料对小鼠肝组织和肝细胞DNA损伤的影响

目的:探讨纳米载银室温固化型聚甲基丙烯酸甲酯(PMMA)材料对雄性小鼠肝脏组织和肝细胞DNA损伤的影响,评估该纳米复合材料的肝脏毒性。方法:40只6~8周龄雄性昆明小鼠随机分为纳米载银室温固化型PMMA组(72h浸提液、1/2 72h浸提液、1/4 72h浸提液)、室温固化型PMMA组(72h浸提液、1/2 72h浸提液和1/4 72h浸提液)、阴性对照组和阳性对照组(n=5)。以经口灌胃的方式,在实验开始、24h和45h给予除阳性对照剂之外的受试物,阳性对照剂甲磺酸乙酯(EMS)仅在24和45h经口灌胃。阴性对照组小鼠灌胃给予等量生理盐水。最后一次给药3h后摘小鼠眼球取血,行肝脏生化指标检测;处死小鼠后立即完整取出肝脏,计算脏器系数;体内彗星实验(CA)检测尾部DNA百分比(%tail DNA)、尾长(TL)和Olive尾矩(OTM),采用彗星图像分析软件进行图像分析。结果:与阴性对照组比较,各实验组小鼠肝脏系数、丙氨酸氨基转移酶(ALT)和门冬氨酸氨基转移酶(AST)水平比较差异均无统计学意义(P>0.05);与阴性对照组比较,纳米载银室温固化型PMMA组和普通室温固化型PMMA组不同浓度浸提液组尾部%tail DNA、TL和OTM比较差异均无统计学意义(P>0.05)。阳性对照组小鼠%tail DNA、TL和OTM明显高于阴性对照组(t=-40.911,P<0.05;t=-16.620,P<0.05;t=32.943,P<0.05)。相同浓度下纳米载银室温固化型PMMA组%tail DNA、TL和OTM与室温固化型PMMA组比较差异均无统计学意义(P>0.05)。纳米载银室温固化型PMMA组不同浓度浸提液%tail DNA、TL和OTM比较差异无统计学意义(P>0.05)。结论:纳米载银室温固化型PMMA材料未对小鼠肝脏及其功能产生不良影响,彗星实验结果提示其不具有遗传毒性,表明该复合材料具有良好的生物相容性。

上颌第一磨牙颊侧单根1例

上颌第一磨牙牙根和根管系统解剖结构复杂,变异较大。上颌第一磨牙只有1个颊根的病例较少见。本文报告1例上颌第一磨牙只有1个颊根和1个腭根各有1个根管的病例。

Application Research Status and Development Prospect of Microbial Flocculant

Microbial flocculant （MBF） is a kind of novel flocculant, which is widely used for the food industry, highly concentrated organic waste water treatment and the urban water supply technology. Due to its characteristics of superior flocculation effect, without secondary pollution to the environment and being easily degraded, MBF has been emerging as a hotspot of water treatment research in recent years. In this paper, the latest progress of the preparation of MBFs and the flocculating mechanism were presented. The practical application research of MBFs for water treatment was reviewed. Finally, suggestions and development prospect of research on MBFs were discussed.

鲍德里亚《消费社会》的“消费异化”逻辑

在鲍德里亚的《消费社会》中,资本主义生产方式带来了巨大的生产力变革,同时也带来了该种生产方式下形成的人们的物质消费观念。物质的极大丰盛,物质欲望的极不满足,导致人们在物质消费中反而逐渐被"消费"掉。《消费社会》的语言表达晦涩、抽象,但其对西方消费社会的解读却异常深刻,理清其所描述的"消费异化"逻辑是读懂学透该著作与理解西方资本主义消费社会本质的关键。

Removal of Cr (Ⅵ) from Simulated Wastewater by FeOOH Supported on Organo-bentonite

FeOOH supported on organo-bentonite was prepared by organo-bentonite with good absorptive property,and the effects of dosage of the composite adsorbent,temperature,and Cr(Ⅵ)concentration on the removal rate of Cr(Ⅵ)in the simulated wastewater were studied.The results indicated that the removal effect of Cr(Ⅵ)was good when the mass fraction of organo-bentonite was 3‰.The removal rate of Cr(Ⅵ)from the simulated wastewater could reach the maximum 98.37% under the following conditions:the dosage of the composite adsorbent was 1.0g;the temperature was 25℃;Cr(Ⅵ)concentration was 10mg/L;the oscillating time was 4h.

“美丽中国”视域下高校生态文明教育机制研究

构建“美丽中国”是新时代生态文明建设的重要战略思想。习近平总书记提出了丰富的生态文明思想理论,为建设人类命运共同体提供了方向指引。在新时代背景下,高校思政课应顺应时代发展趋势,重视生态文明教育,并从时代背景出发,结合“美丽中国”思想积极构建生态文明教育机制,从创新教育模式、培育师资力量、构建校园生态文化等角度完善教育机制,不断提升人才培养水平,培养出建设“美丽中国”坚实的后备军。