Effect of Bi,Sb, and Ti on Microstructure and Mechanical Properties of SAC105 Alloys

The Sn-Ag-Cu (SAC) solder alloys with a low Ag (Ag < 3 wt.%) content have attracted great attention owing to their low cost, increased ability in bulk compliance, and plastic energy dissipation. However, some of their mechanical properties are generally lower than the SAC alloys with a higher Ag content. Adding alloying elements is an effective approach for improving the mechanical properties of the SAC alloys. In this study, the effect of Bi, Sb, and Ti on Sn-1 wt.%Ag-0.5 wt.%Cu (SAC105) solder alloys was investigated. The SAC solders with four compositions: SAC105-1 wt.%Bi, SAC105-1 wt.%Sb, SAC105-1 wt.%Bi-1 wt.%Sb, SAC105-1 wt.%Bi-1 wt.%Sb-0.4 wt.%Ti were prepared. The microstructure and phase compositions were characterized using electron scanning microscopy, and X-ray diffraction. The thermal properties and wettability were also examined. Uniaxial tensile tests and nano-indentation tests were conducted to evaluate the mechanical properties. The results show that adding Bi or Sb could increase the strength of SAC105 alloys mainly due to the solid solution strengthening effect. The creep resistance of SAC105 alloys was also improved with the additions of Bi and Sb. The co-additions of Bi and Sb into SAC105 alloys exhibit an enhanced creep resistance than that calculated by the theoretical calculation. The further addition of Ti into SAC105-1Bi-1Sb alloys demonstrated a much-improved creep resistance, which could be attributed to the synergistic effects of both solid solution strengthening and the precipitation hardening effects.     

索拉非尼在肝癌治疗中的应用

肝细胞癌是最常见的恶性肿瘤之一,死亡率高,预后不理想。近年来,应用分子靶向药物治疗肝癌取得重大突破,特别是多靶点、多激酶抑制药索拉非尼在肝癌的治疗取得的成功。     

以眼部症状为突出表现的鼻NK/T细胞淋巴瘤

目的:探讨以眼部症状为突出表现的鼻NK/T细胞淋巴瘤的临床特点及误诊原因。方法:回顾性分析2009-2011年诊治的11例以眼部症状为突出表现的鼻NK/T细胞淋巴瘤患者的临床资料。结果:首诊误诊率为72.7%,1次病理检查误诊率为27.3%。以眼部症状为突出表现的鼻NK/T细胞淋巴瘤发病较快,影像学表现相对特异。结论:以眼部症状为突出表现的鼻NK/T细胞淋巴瘤易误诊;结合临床特点、影像学表现,经病理学检查有助于尽早确诊。     

Exosomes with FOXP3 from gene-modified dendritic cells ameliorate the development of EAE by regulating the balance of Th/Treg

Objective: To investigate the efficiency and potential mechanisms of exosomes from dendritic cells (DCs) transfected with Forkhead box protein P3 (FOXP3) in the development of experimental autoimmune encephalomyelitis (EAE).Method: Mouse bone marrow-derived immature DCs were loaded with adenovirus carrying FOXP3 gene, and exosomes were generated. Then the exosomes with FOXP3 (FOXP3-EXOs) were co-cultured with CD4+T cell in vitro to evaluate their potential on CD4+T cell proliferation and differentiation, and injected into EAE mice to assess their effects on the development of EAE.Result: FOXP3-EXOs were effective to inhibit the CD4⁺T cell proliferation and the production of Interferon gamma (IFN-γ), interleukin (IL)-6, and IL-17, while they promoted the production of IL-10 in vitro. Moreover, FOXP3-EXOs treatment significantly decreased the neurological scores, reduced the infiltration of inflammatory cells into the spinal cord, and decreased demyelination in comparison to saline and Con-EXOs treated EAE mice. Moreover, the FOXP3-EXOs treatment resulted in obvious increases in the levels of regulatory T (Treg) cells and IL-10, whereas levels of T helper 1 (Th1) cells, Th17 cells, IFN-γ, IL-6, and IL-17 decreased significantly in the splenocyte culture of EAE mice.Conclusion: The present study preliminarily investigated the effects and potential mechanisms of FOXP3-EXOs in EAE and revealed that the FOXP3-EXOs could inhibit the production of Th1 and Th17 cells and promote the production of Treg cells as well as ameliorate the development of EAE. The neuroprotective effects of FOXP3-EXOs on EAE are likely due to the regulation of Th/Treg balance.     

竹红菌甲素敏化E．coli菌体蛋白光氧化反应及机制

本工作利用ＳＤＳ聚丙烯酰胺胶电泳技术分析了甲素对Ｅ．ｃｏｌｉ菌体蛋白光氧化的敏化作用。实验结果表明，甲素结合光照可引起菌体蛋白降解及交联。甲素敏化菌体蛋白光氧化反应可放单线态氧淬灭剂──ＮａＮ３抑制，但不被各种氧自由基、羟自由基抑制剂所阻断，提示甲素敏化的菌体蛋白光氧化反应属Ⅱ型机制。     

不同冻存液冻存慢病毒转染后稳转肝癌细胞株 HepG2的效果比较

目的筛选冻存慢病毒转染后稳转肝癌细胞株HepG2的最佳冻存液。方法采用甘油和二甲基亚砜(DMSO)2种不同冻存保护剂,以4种不同比例的冻存液分别冻存慢病毒转染后肝癌细胞HepG2及未转染的HepG2细胞,并对上述细胞复苏后的存活率及增殖能力进行比较分析。结果采用甘油为冻存保护剂时,冻存液[DMEM∶胎牛血清(FBS)∶甘油]比例为0∶9∶1的转染后细胞存活率最高(P=0.001);未转染细胞存活率与冻存液比例无关(P=0.293)。采用DMSO为冻存保护剂时,转染后细胞存活率为0%;未转染细胞存活率在60%及以上,且与冻存液比例无关(P=0.487)。冻存液中血清含量越高,复苏后细胞的增殖能力越强(P<0.05)。结论冻存慢病毒转染后的稳转肝癌细胞株HepG2的最佳冻存液为90%FBS+10%甘油。     

胫骨交锁髓内钉术后感染分析

目的：探讨胫腌骨骨折交锁髓内钉术后感染的预防与治疗方法。方法;对12例术后感染的病例进行回顾性分析。3例经过抗菌素治疗,9例经过闭式滴不引流加抗菌素治疗,结果;全部病例获随访,随访时间10个月－2年,感染控制,骨折愈合,结论：对胫骨交锁髓内钉术后感染的病人,不必急于取出内固定,采用闭式滴注引流加抗菌素治疗可获得满意效果。     

心房颤动患者心房肌组织AT1-R、AT2-RmRNA的表达及研究

目的:分析血管紧张素Ⅱ受体1型(AT1-R)和受体2型(AT2-R)mRNA在心房颤动心房肌组织中的表达情况,并探讨其与心房结构重构的关系.方法:38例因心脏疾患住院接受开胸手术的患者,男18例,女20例,平均年龄(51.97±13.87)岁(18～77岁),分为3组:窦性心律组(SR组,11例),阵发性心房颤动组(pAF组,心房颤动持续时间小于6个月,13例),慢性心房颤动组(cAF组,心房颤动持续时间大于6个月,14例).半定量聚合酶链式反应技术测定AT1-RmRNA、AT2-RmRNA和免疫组织化学技术测定AT1-R受体蛋白在心房肌组织中的表达情况.结果:与SR组和pAF组相比,cAF组患者的平均左心房直径明显增大(P＜0.01),左心室射血分数降低(P＜0.05);心房肌组织中AT1-RmRNA表达明显下调(P＜0.01～0.05),AT2-R mRNA表达明显上调(P＜0.05).AT1-R mRNA表达与左心房直径负相关(P＜0.005);AT2-R mRNA表达与左心房直径正相关,与左心室射血分数负相关.AT1-R蛋白阳性染色在SR组主要见于细胞膜,在cAF组患者主要见于成纤维细胞和血管平滑肌细胞.结论:cAF时,AT1-RmRNA表达下调,AT2-R mR-NA表达上调,说明存在组织肾素-血管紧张素系统(RAS)激活,RAS可能是通过促进心房结构重构形成,从而影响心房颤动的发生.