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Interaction between Ternary Rare Earth Complexes of Cinnamic Acid and Phenanthroline with DNA by Spectroscopy 总被引:2,自引:0,他引:2
Considerableattentionshavebeenpaidtothe salicylicacid,theendogenoussignalmoleculein plant,becauseofitsspecialbiologicalfunctionsin manybiologicalprocesses[1].Someinvestigations havedemonstratedthatsalicylicacidcaneliminatethebiologicalfreeradicals,andprot… 相似文献
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Y2SiO5:Ce3+ particle growth during sol-gel preparation 总被引:1,自引:0,他引:1
The phosphor Y2SiO5:Ce3+ was prepared by a sol-gel method and the particle growth process was investigated by XRD, SEM and TEM. After heating at 400 °C, the as-dried gel became a powder composed of mixed phases of polycrystalline Y2O3 and amorphous SiO2. With an increase in temperature, the crystallinity of Y2O3 improved. The sample quickly changed to the pure Y2SiO5 phase when it was heated at 1400 °C for 10 min. SEM indicated that the as-dried gel consisted of large porous particles. At an annealing temperature of higher than 400 °C, the pores in the large particles gradually expanded and grains started to appear. Consequently, the large particles disintegrated into small particles. When the sample was heated at 1400 °C, we obtained fine phosphor particles (around 2 μm) with smooth surfaces. The optimized condition for the preparation of the Y2SiO5:Ce3+ phosphor was to heat at 1400 °C for 2 h. 相似文献
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铈盐治疗烧伤的有关药学性质探讨 总被引:6,自引:0,他引:6
本文比较了硝酸铈、氯化铈、乙酸铈等三种铈盐的抑菌作用,半数致死量(LD_(50)),抗炎作用及动物烧伤的治疗观察。认为铈盐能够提高治疗烧伤的疗效,其主要原因是抗炎作用,其次有杀菌和其它辅助作用。提出以铈盐与杀菌药物配合使用,是治疗烧伤的较好的配伍方式。 相似文献
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