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以实验室自制的聚三亚甲基碳酸酯(PTMC)为研究对象,通过测定聚三亚甲基碳酸酯在体外酶解过程中降解液pH变化,考察其在降解过程中是否产生酸性降解产物;通过MTS法考察聚三亚甲基碳酸酯的体外细胞毒性;通过HE染色的方法考察聚三亚甲基碳酸酯在大鼠体内埋植部位的皮肤刺激性,进而考察聚三亚甲基碳酸酯的生物相容性。结果表明:PTMC在降解过程中不产生酸性降解产物,可避免埋植部位无菌炎症的产生。同时不同分子量的PTMC可以存在于皮下组织而不会造成伤害,因此聚三亚甲基碳酸酯具有良好的生物相容性,可安全植入体内。 相似文献
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在教学中,为了实现对每个学生及时的关注和引导,我设计了"个人学习情况记录作业".引导全班同学自我观察和自我监控,并在他们作出比较恰当的自我评价,向自己提出可能目标时给予强化和积极的引导,促进学生主动进行自我调节,促使不同能力水平的学生成为自己的主人.本文主要就作业的实施情况和效果进行介绍. 相似文献
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Highly sensitive room-temperature gas sensors based on hydrothermal synthesis of Cr2O3 hollow nanospheres 下载免费PDF全文
This paper reports that Cr2O3 hollow nanospheres(HNs) were synthesized via a hydrothermal approach and characterized by scanning electron microscopy,x-ray powder diffraction,transmission electron microscopy(TEM),selective area electron diffraction and high resolution TEM,respectively.In addition,the room-temperature(RT) gas sensing properties of Cr2O3 HNs and conventional powders(CPs) were investigated by means of the surface photovoltage technique.The experimental data demonstrate that the RT gas sensor of the as-fabricated HNs reaches below 5 ppm whereas that of the CPs is about 40 ppm,which results from there being much more adsorbed and desorbed oxygen in HNs than in CPs at RT.The as-prepared Cr2O3 HNs could have potential applications as RT nanosensors. 相似文献
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