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| 1 | Preparation and luminescence properties of Y_2O_3:Er^(3+) /TiO_2 with high specific surface area显示文摘The three composites Y2O3 :Er3+ , Y2O3 :Er3+ /Yb 3+ andY2O3 :Er3+ /TiO2 were prepared using coprecipitation and sol-gel techniques. Their morphology, specific surface area, porosity, UV-vis. absorption spectra and fluorescence spectra were measured using SEM, TEM, surface analysis, UV-vis. absorption and photoluminescence spectrophotometry. SEM and TEM showed that samples prepared using coprecipitation were dispersed, while Y2O3 :Er3+ /TiO2 particles possessed a mesoporous surface and average diameter of about 10 nm. The specific surface area and porosity of Y2O3 :Er3+ /TiO2 did not result from the combination of the individual properties of Y2O3 :Er3+ and TiO2 . The specific surface area of Y2O3 :Er3+ /TiO2 was 135.991 m 2 /g and was 4.8 times that of Y2O3 :Er3+ and 2.5 times that of Degussa P25 TiO2 . A high specific surface area is conducive for application to TiO2 photocatalysis. The fluorescence spectra of the three composites exhibited three upconversion emission peaks with maxima at 237, 395 and 467 nm following excitation at 388, 500 and 570 nm, respectively. | YE YanXi LIU EnZhou HU XiaoYun YAN ZhiYun JIANG ZhenYi FAN Jun | 2011 | Chinese Science Bulletin2011，56，25： | 4 |
| 2 | The green-emitting fluorescence of nano Y_2O_3:Er^(3+) under different excitations显示文摘The green-emitting fluorescent powders of nano Y2O3:Er3+ were fabricated by the coprecipitation method. The X-ray diffraction pattern shows that as-prepared Y2O3:Er3+ is the cubic phase crystal with a grain size of about 30 nm. The UV-Vis spectrum indicates Y2O3:Er3+ exhibits five ultraviolet visible absorption peaks at 365, 377, 489, 521 and 652 nm respectively. Meanwhile, the fluorescence spectra of Y2O3:Er3+ display four emission peaks at 522, 537, 550 and 562 nm at the excitation of 365, 377 and 521 nm, respectively. The green-emitting fluorescent mechanism of Y2O3:Er3+ is proposed as well. Additionally, the temperature dependence of fluorescence properties and metal Ag fluorescence enhancement effect are investigated. Results show that increasing the annealing temperature and metal Ag doping both can enhance the fluorescence intensity. The maximum enhancement is 87.5% after Ag is doped. | JI RuoNan YE YanXi HU XiaoYun FAN Jun LIU EnZhou ZHANG Qian ZHAO ChaoShuai YE SiWen | 2012 | Science China(Physics,Mechanics & Astronomy)2012，55，7： | 3 |
| 3 | SRSFs mediate the function of AR in the ovarian granulosa cells of patients with PCOS显示文摘Ovarian hyperandrogenism is one of the characteristics of polycystic ovary syndrome(PCOS)and androgen receptor(AR)in ovarian granulosa cells(GCs)functions as an important element to the accumulation of androgens.This study verified the existence of alternative splicing variant of AR(AR-SVs)in the GCs of PCOS patients and found that the function of AR decreased significantly in the presence of AR-SVs.And compared to the normal individuals,the expression of Serine/arginine-rich splicing factor 2(SRSF2)was higher and the expression of SRSF3 was lower in the GCs of patients with AR-SVs.More importantly,we found that the expression of SRSF2 was inhibited and that the expression of AR was decreased after the successful upregulation of miRNA-183,and testostrone(T)concentrations in the culture medium were increased.The results also showed that the expression of SRSF3 decreased when miRNA-124 was successfully upregulated,while the expression of AR significantly increased;however,the function of AR was also inhibited when T concentration in the culture medium was increased.This study has proved that SRSFs are regulated by corresponding miRNAs,and the altered expression of SRSFs interferenced the alternative splicing process of AR and ultimately decreased the function of AR,leading to the accumulation of androgens in the ovary. | Jing Luo Hong Ye Lijuan Hao Yixuan Sun Ruohan Li Yanxi Li Zhu Yang | 2021 | Genes & Diseases2021，8，1： | 0 |
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