X 射线转换屏用Tb3+激活磷酸盐发光玻璃

Phosphate glasses 60P2O5-15CS2O- 15Al2O3-10BaO were made by high temperature melt-annealing method. The absorption spectra, excitation spectra and emission spectra of Gd³⁺-Tb³⁺ and Ce3+-Gd³⁺-Tb³⁺ co-doped phosphate glass 60P2O5-15CS2O- 15Al2O3-10BaO were studied. The experimental results indicate that, the doping of Ce3+ and Gd³⁺ in Tb³⁺ phosphate glass has a good effect on the 545 nm emission of Tb³⁺ at UV excitation. The Ce3+-Gd³⁺-Tb³⁺ co-doped phosphate glass have a good x-ray luminescence at the radiation of x-ray with energy in 50-120 kev, and a high space resolution. The Ce3+-Gd³⁺-Tb³⁺ co-doped phosphate luminescence glass is a promising material for using in the digital radiography system in medical devices.

非晶状体βγ晶状体蛋白与三叶因子蛋白复合物诱导兔胸主动脉环内皮依赖的持续收缩效应

脊椎动物中,非晶状体βγ-晶状体蛋白广泛分布于各种组织,但是功能知之甚少.三叶因子在创伤修复与肿瘤发生中具有重要作用,其分子作用机制尚不清楚.非晶状体βγ晶状体蛋白与三叶因子蛋白复合物(βγ-CAT)是一个从大蹼铃蟾皮肤分泌物中分离的一类全新的蛋白复合物.研究表明,βγ-CAT能够诱导离体的兔胸主动脉产生快速而持续的收缩,结合药理学抑制剂,细胞培养,激光共聚焦显微镜和免疫荧光原位组化,从细胞和分子水平对其作用机制进行研究.结果表明:.βγ-CAT诱导兔胸主动脉产生的收缩效应为剂量依赖(2-35 nmol/L)和内皮依赖(P＜0.01).在βγ-CAT(25nmol/L)处理的主动脉环的内皮细胞层检测到肿瘤坏死因子-α的释放.同时,βγ-CAT能够诱导原代培养的兔胸主动脉内皮细胞(RAEC)快速释放肿瘤坏死因子-α,βγ-CAT(25nmol/L)分别处理5和30min,RAEC释放的肿瘤坏死因子-α的浓度分别为(34.17±5.10)pg/mL和(98.01±4.67)pg/mL(P＜0.01).表明肿瘤坏死因子-α在βγ-CAT诱导兔胸丰动脉产生的收缩效应中发挥重要作用.为进一步深入研究非晶状体βγ晶状体蛋白与三叶因子的生理功能提供了新的思路和线索.

A new species of sisorid catfish genus Glyptothorax (Teleostei: Sisoridae) from Salween drainage of Yunnan, China

A new species of the genus Glyptothorax, Glyptothorax obliquimaculatus sp. nov. is described from the Xiaohei River, a tributary of the Nanting River, Salween drainage, in southwestern Yunnan province, China. This new species can be distinguished from its congeners by the following combination of characteristics: unculiferous ridges of the thoracic adhesive apparatus extending anteriorly onto the gular region; body with irregular dark blotches scattered along lateral surface (blotches mostly oblique); skin smooth on head and body; dorsal spine smooth without serrations on its posterior margin; lips smooth; posterior margin of pectoral spine with 7-8 serrations; dorsal-fin base 11.0-13.2% SL; pectoral-fin length 15.6-19.6% SL; depth of caudal peduncle 8.6-9.8% SL; head width 19.1-24.0% SL; nasal barbel length 23.3-33.3% HL.

The Compact Pulsed Hadron Source: A Design Perspective

During the past. decades, large-scale national neutron sources have been developed in Asia, Europe, and North America. Complementing such efforts, compact hadron beam complexes and neutron sources intended to serve primarily universities and industrial institutes have been proposed, and some have recently been established. Responding to the demand in China for pulsed neutron/proton-beam platforms that are dedicated to fundamental and applied research for users in multiple disciplines from materials characterization to hadron therapy and radiography to accelerator-driven sub-critical reactor systems (ADS) for nuclear waste transmutation, we have initiated the construction of a compact, yet expandable, accelerator complex-the Compact Pulsed Hadron Source (CPHS). It consists of an accelerator front-end (a high-intensity ion source, a 3-MeV radio-frequency quadrupole linac (RFQ), and a 13-MeV drift-tube linac (DTL)), a neutron target station (a beryllium target with solid methane and room-temperature water moderators/reflector), and experimental stations for neutron imaging/radiography, small-angle scattering, and proton irradiation. In the future, the CPHS may also serve as an injector to a ring for proton therapy and radiography or as the front end to an ADS test facility. In this paper, we describe the design of the CPHS technical systems and its intended operation.