YPO4 phosphors single-doped with Sb3+ or Gd3+ and co-doped with Sb3+ and Gd3+were prepared by a solid-state reaction method. The phase purity, morphology, photoluminescence excitation and emission properties of the pr...YPO4 phosphors single-doped with Sb3+ or Gd3+ and co-doped with Sb3+ and Gd3+were prepared by a solid-state reaction method. The phase purity, morphology, photoluminescence excitation and emission properties of the prepared phosphors were inves-tigated. The results showed that Sb3+ could sensitize Gd3+ in the co-doped phosphors which made the phosphors excitable by short-wave ultraviolet (UV) at a wavelength between 220 and 260 nm. Under 253.7 nm excitation, the co-doped phosphors Y1–x–yPO4: Sb3+x,Gd3+yshowed strong emission of Gd3+ at a wavelength of 312 nm whose intensity changed with the doping concentrations of Gd3+ and Sb3+. The optimized Y0.77PO4:Sb3+0.07,Gd3+0.16 phosphor showed an intensity comparable to commercial LaPO4:Ce phosphor (UVB-315), making it a potential candidate for mercury low-pressure discharge narrow-band UV-B emitting lamps.展开更多
目的:探讨窄谱中波紫外线(narrow-band ultraviolet B,NB-UVB)通过促进维生素D(vitamin D,VD)代谢缓解咪喹莫特(imiquimod,IMQ)诱导银屑病样小鼠皮炎的效应机制。方法:C57BL/6小鼠背部去毛外涂IMQ乳膏进行银屑病样皮炎的造模,检测小鼠...目的:探讨窄谱中波紫外线(narrow-band ultraviolet B,NB-UVB)通过促进维生素D(vitamin D,VD)代谢缓解咪喹莫特(imiquimod,IMQ)诱导银屑病样小鼠皮炎的效应机制。方法:C57BL/6小鼠背部去毛外涂IMQ乳膏进行银屑病样皮炎的造模,检测小鼠血清中VD代谢产物25(OH)D_(3)和1,25(OH)_(2)D_(3)的含量,以及皮损中VD受体(vitamin D receptor,VDR)mRNA表达;确定NB-UVB照射小鼠的辐照能量后,进行造模联合NB-UVB照射,观察小鼠皮损,检测血清中25(OH)D_(3)和1,25(OH)_(2)D_(3)的含量、皮损中VDR和炎症因子[白细胞介素(interleukin,IL)-17A、IL-23、肿瘤坏死因子(tumor necrosis factor,TNF)-α、IL-1β]的mRNA表达及蛋白含量及CD_(3)^(+)CD4^(+)IL-17A^(+)T细胞比例。使用特异性抑制剂Dafadine-A阻断小鼠VD代谢关键酶细胞色素P450家族27亚家族A成员1(cytochrome P450 family 27 subfamily A member 1,CYP27A1)活性后,再进行造模和NB-UVB照射,观察皮损,检测皮损中CD_(3)^(+)CD4^(+)IL-17A^(+)T细胞比例、炎症因子表达情况、VDR mRNA表达情况和血清中25(OH)D_(3)、1,25(OH)_(2)D_(3)的含量。结果:银屑病样小鼠模型血清中25(OH)D_(3)、1,25(OH)_(2)D_(3)含量和皮损中VDR的mRNA表达均显著降低。NB-UVB照射银屑病样小鼠模型后,相比模型组,小鼠血清中25(OH)D_(3)、1,25(OH)_(2)D_(3)含量和皮损中VDR的mRNA表达上调,皮损中炎症因子IL-17A、IL-23、TNF-α、IL-1β的表达及含量均下调、CD_(3)^(+)CD4^(+)IL-17A^(+)T细胞比例也显著下降。使用Dafadine-A预处理小鼠后进行造模联合NB-UVB照射,相比IMQ联合NB-UVB照射组,血清中25(OH)D_(3)、1,25(OH)_(2)D_(3)含量和皮损中VDR的mRNA表达均显著降低,皮损中CD_(3)^(+)CD4^(+)IL-17A^(+)T细胞比例和炎症因子IL-17A、IL-23、TNF-α、IL-1β的含量均显著升高。结论:NB-UVB照射通过促进VD代谢缓解银屑病样小鼠皮肤炎症。特异性阻断VD代谢关键酶CYP27A1活性后,NB-UVB照射缓解银屑病样小鼠皮损及炎症反应的效应显著减弱。展开更多
AIM: To examine the efficacy of non-magnifying narrow-band imaging(NM-NBI) imaging for small signet ring cell carcinoma(SRC).METHODS: We retrospectively analyzed 14 consecutive small intramucosal SRCs that had been tr...AIM: To examine the efficacy of non-magnifying narrow-band imaging(NM-NBI) imaging for small signet ring cell carcinoma(SRC).METHODS: We retrospectively analyzed 14 consecutive small intramucosal SRCs that had been treated with endoscopic submucosal dissection(ESD) and 14 randomly selected whitish gastric ulcer scars(control). The strength and shape of the SRCs and whitish scars by NM-NBI and white-light imaging(WLI) were assessed with Image J(NIH, Bethesda).RESULTS: NM-NBI findings of SRC showed a clearly isolated whitish area amid the brown color of the surrounding normal mucosa. The NBI index, which indicates the potency of NBI for visualizing SRC, was significantly higher than the WLI index(P = 0.001), indicating SRC was more clearly identified by NM-NBI. Although the NBI index was not significantly different between SRCs and controls, the circle(C)-index, as an index of circularity of tumor shape, was significantly higher in SRCs(P = 0.001). According to the receiveroperating characteristic analysis, the resulting cut-off value of the circularity index(C-index) for SRC was 0.60(85.7% sensitivity, 85.7% specificity). Thus a lesion with a C-index ≥ 0.6 was significantly more likely to be an SRC than a gastric ulcer scar(OR = 36.0; 95%CI: 4.33-299.09; P = 0.0009).CONCLUSION: Small isolated whitish round area by NM-NBI endoscopy is a useful finding of SRCs which is the indication for ESD.展开更多
Vitiligo is a common, acquired pigmentary disorder of unknown etiology with great impact on patient's appearance and quality of life. It presents a therapeutic challenge to many dermatologists. Photochemotherapy u...Vitiligo is a common, acquired pigmentary disorder of unknown etiology with great impact on patient's appearance and quality of life. It presents a therapeutic challenge to many dermatologists. Photochemotherapy using psoralen and ultraviolet A(UVA) therapy, topical and oral immunosuppresants, as well as cosmetic camouflage are also commonly employed with varying clinical efficacy. Phototherapy is a popular treatment option, which includes both of the generalized ultraviolet B(UVB) therapies, broadband UVB and narrowband UVB(NB-UVB). It has been used favorably, both alone as well as in combination with other agents like topical calcineurin inhibitors, vitamin-D analogs. Combination therapies are useful and may provide quicker regimentation and treat vitiligo with an additive mechanism of action than UVB phototherapy. Advances in technology may lead to the continuing use of UVB phototherapy as a treatment for vitiligo through the development of sophisticated devices and delivery systems as well as innovative application methods. These will provide increased therapeutic options for all vitiligo patients, particularly those with refractory disease. In this article, I have reviewed the available data pertaining to efficacy and safety issues for NB-UVB as monotherapy, its comparison with psoralen plus UVA and other modes of phototherapy, combination regimens that have been tried and future prospects of NB-UVB in vitiligo.展开更多
文摘YPO4 phosphors single-doped with Sb3+ or Gd3+ and co-doped with Sb3+ and Gd3+were prepared by a solid-state reaction method. The phase purity, morphology, photoluminescence excitation and emission properties of the prepared phosphors were inves-tigated. The results showed that Sb3+ could sensitize Gd3+ in the co-doped phosphors which made the phosphors excitable by short-wave ultraviolet (UV) at a wavelength between 220 and 260 nm. Under 253.7 nm excitation, the co-doped phosphors Y1–x–yPO4: Sb3+x,Gd3+yshowed strong emission of Gd3+ at a wavelength of 312 nm whose intensity changed with the doping concentrations of Gd3+ and Sb3+. The optimized Y0.77PO4:Sb3+0.07,Gd3+0.16 phosphor showed an intensity comparable to commercial LaPO4:Ce phosphor (UVB-315), making it a potential candidate for mercury low-pressure discharge narrow-band UV-B emitting lamps.
文摘目的:探讨窄谱中波紫外线(narrow-band ultraviolet B,NB-UVB)通过促进维生素D(vitamin D,VD)代谢缓解咪喹莫特(imiquimod,IMQ)诱导银屑病样小鼠皮炎的效应机制。方法:C57BL/6小鼠背部去毛外涂IMQ乳膏进行银屑病样皮炎的造模,检测小鼠血清中VD代谢产物25(OH)D_(3)和1,25(OH)_(2)D_(3)的含量,以及皮损中VD受体(vitamin D receptor,VDR)mRNA表达;确定NB-UVB照射小鼠的辐照能量后,进行造模联合NB-UVB照射,观察小鼠皮损,检测血清中25(OH)D_(3)和1,25(OH)_(2)D_(3)的含量、皮损中VDR和炎症因子[白细胞介素(interleukin,IL)-17A、IL-23、肿瘤坏死因子(tumor necrosis factor,TNF)-α、IL-1β]的mRNA表达及蛋白含量及CD_(3)^(+)CD4^(+)IL-17A^(+)T细胞比例。使用特异性抑制剂Dafadine-A阻断小鼠VD代谢关键酶细胞色素P450家族27亚家族A成员1(cytochrome P450 family 27 subfamily A member 1,CYP27A1)活性后,再进行造模和NB-UVB照射,观察皮损,检测皮损中CD_(3)^(+)CD4^(+)IL-17A^(+)T细胞比例、炎症因子表达情况、VDR mRNA表达情况和血清中25(OH)D_(3)、1,25(OH)_(2)D_(3)的含量。结果:银屑病样小鼠模型血清中25(OH)D_(3)、1,25(OH)_(2)D_(3)含量和皮损中VDR的mRNA表达均显著降低。NB-UVB照射银屑病样小鼠模型后,相比模型组,小鼠血清中25(OH)D_(3)、1,25(OH)_(2)D_(3)含量和皮损中VDR的mRNA表达上调,皮损中炎症因子IL-17A、IL-23、TNF-α、IL-1β的表达及含量均下调、CD_(3)^(+)CD4^(+)IL-17A^(+)T细胞比例也显著下降。使用Dafadine-A预处理小鼠后进行造模联合NB-UVB照射,相比IMQ联合NB-UVB照射组,血清中25(OH)D_(3)、1,25(OH)_(2)D_(3)含量和皮损中VDR的mRNA表达均显著降低,皮损中CD_(3)^(+)CD4^(+)IL-17A^(+)T细胞比例和炎症因子IL-17A、IL-23、TNF-α、IL-1β的含量均显著升高。结论:NB-UVB照射通过促进VD代谢缓解银屑病样小鼠皮肤炎症。特异性阻断VD代谢关键酶CYP27A1活性后,NB-UVB照射缓解银屑病样小鼠皮损及炎症反应的效应显著减弱。
文摘AIM: To examine the efficacy of non-magnifying narrow-band imaging(NM-NBI) imaging for small signet ring cell carcinoma(SRC).METHODS: We retrospectively analyzed 14 consecutive small intramucosal SRCs that had been treated with endoscopic submucosal dissection(ESD) and 14 randomly selected whitish gastric ulcer scars(control). The strength and shape of the SRCs and whitish scars by NM-NBI and white-light imaging(WLI) were assessed with Image J(NIH, Bethesda).RESULTS: NM-NBI findings of SRC showed a clearly isolated whitish area amid the brown color of the surrounding normal mucosa. The NBI index, which indicates the potency of NBI for visualizing SRC, was significantly higher than the WLI index(P = 0.001), indicating SRC was more clearly identified by NM-NBI. Although the NBI index was not significantly different between SRCs and controls, the circle(C)-index, as an index of circularity of tumor shape, was significantly higher in SRCs(P = 0.001). According to the receiveroperating characteristic analysis, the resulting cut-off value of the circularity index(C-index) for SRC was 0.60(85.7% sensitivity, 85.7% specificity). Thus a lesion with a C-index ≥ 0.6 was significantly more likely to be an SRC than a gastric ulcer scar(OR = 36.0; 95%CI: 4.33-299.09; P = 0.0009).CONCLUSION: Small isolated whitish round area by NM-NBI endoscopy is a useful finding of SRCs which is the indication for ESD.
文摘Vitiligo is a common, acquired pigmentary disorder of unknown etiology with great impact on patient's appearance and quality of life. It presents a therapeutic challenge to many dermatologists. Photochemotherapy using psoralen and ultraviolet A(UVA) therapy, topical and oral immunosuppresants, as well as cosmetic camouflage are also commonly employed with varying clinical efficacy. Phototherapy is a popular treatment option, which includes both of the generalized ultraviolet B(UVB) therapies, broadband UVB and narrowband UVB(NB-UVB). It has been used favorably, both alone as well as in combination with other agents like topical calcineurin inhibitors, vitamin-D analogs. Combination therapies are useful and may provide quicker regimentation and treat vitiligo with an additive mechanism of action than UVB phototherapy. Advances in technology may lead to the continuing use of UVB phototherapy as a treatment for vitiligo through the development of sophisticated devices and delivery systems as well as innovative application methods. These will provide increased therapeutic options for all vitiligo patients, particularly those with refractory disease. In this article, I have reviewed the available data pertaining to efficacy and safety issues for NB-UVB as monotherapy, its comparison with psoralen plus UVA and other modes of phototherapy, combination regimens that have been tried and future prospects of NB-UVB in vitiligo.
