铜、铁元素和麝香对癌细胞增殖与动力学影响的研究

目的：研究元素铜、铁、麝香对癌细胞增 殖及细胞周期的影响。方法：荷腹水肝癌 Ｂ Ａ Ｌ Ｂ／ｃ 小鼠分别ｉｇ 铜、铁、麝香制剂１２ 天,取腹水 癌细胞进行细胞分裂指数和流式细胞光度计分析。结果：铜、铁、麝香对癌细胞均有不同程度的抑制作用, 使分裂 指数 下降, 中小 细胞（ １０ ～２５μｍ ） 明 显增 加而 大 细胞（ ＞ ２５ μｍ ） 明 显 减少。铜、铁可使癌细胞主要阻滞在 Ｇ２ ＋ Ｍ 期。麝香对细胞大小和 细胞周期 基本无 影响。结论： 铜、铁使 癌细胞 主要阻滞在对抗癌药敏感的 Ｇ２ ＋ Ｍ 期。     

ICP-MS测定香芍软胶囊中砷 汞 铅 镉 铜的含量

目的：采用电感耦合等离子体质谱（ICP-MS）法测定香芍软胶囊（XSSC）囊心物中砷、汞、铅、镉、铜的含量。方法：样品经微波消解，以Re为内标，以茶叶、圆白菜标准物质为质控，采用ICP-MS测定上述5种元素。结果：对于所测5种元素，标准曲线的相关系数r〉0．9996，回收率为95．8-101．6％，RSD〈5．8％。结论：本测定方法快捷、准确、灵敏度高，适用于XSSC囊心物中上述5种元素的同时测定。     

曲安奈德球周注射联合激光治疗糖尿病性黄斑水肿的疗效研究

目的探讨曲安奈德球周注射联合激光治疗糖尿病性黄斑水肿的疗效。方法选择2012年1月~2014年1月我院收治的糖尿病性黄斑水肿患者48例（60眼）,全部入选病例随机分为观察组（n=26,30眼,曲安奈德球周注射联合激光治疗）和对照组（n=22,30眼,激光治疗）,比较两组的视力改善情况、FFA检查结果及两组患者治疗前及治疗后1、3、6个月黄斑中心凹视网膜厚度的变化。结果观察组30只患眼视力提高率达73.33%,显著高于对照组,差异具有统计学意义（χ^2=6.357,P〈0.05）。观察组30只患眼水肿未退率3.3%,显著低于对照组,差异具有统计学意义（χ^2=7.386,P〈0.05）。治疗1、3、6个月后,两组患者黄斑中心凹视网膜厚度分别较治疗前显著降低（P〈0.01）,且观察组较对照组降低更显著（P〈0.01）。结论曲安奈德球周注射联合激光治疗糖尿病性黄斑水肿可有效地提高视力,减轻黄斑水肿程度,安全性好,值得推广和应用。     

Restirring and Reheating Effects on Microstructural Evolution of Al–Zn–Mg–Cu Alloy during Underwater Friction Stir Additive Manufacturing

Friction stir additive manufacturing (FSAM) can be potentially used for fabricating high-performance components owing to its advantages of solid-state processing. However, the inhomogeneous microstructures and mechanical properties of the build attributed to the complex process involving restirring and reheating deserve attention. This study is based on the previous research of the underwater FSAMed 7A04 aluminum alloy and adopts a quasi in situ experimental method, i.e., after each pass of the underwater FSAM, samples were taken from the build for microstructural observation to investigate the restirring and reheating effects on microstructural evolution during the underwater FSAM. Fine-grain microstructures were formed in the stir zone during the single-pass underwater FSAM. After restirring, the grain size at the bottom of the overlapping region decreased from 1.97 to 0.87 μm, the recrystallization degree reduced from 74.0% to 29.8%, and the initial random texture transformed into a strong shear texture composed of the C {110}<11¯0>. After reheating, static recrystallization occurred in the regions close to the new additive zones, increasing the grain size and recrystallization degree. This study not only revealed the microstructural evolution during the underwater FSAM but also provided a guideline for further optimization of the mechanical properties of the Al–Zn–Mg–Cu alloy build.     

火焰原子吸收分光光度法测定SD大鼠神经组织之钙镁铁锌铜

目的:建立火焰原子吸收分光光度法测定正常SD大鼠神经组织中钙、镁、铁、锌、铜的含量,并提供其正常参考值范围。方法:使用火焰原子吸收标准曲线法测定神经组织中的钙、镁、铁、锌、铜含量,并做加标回收实验。结果:正常SD大鼠神经组织中钙、镁、铁、锌、铜的含量分别为190.31±1.29、679.79±97.67、138.15±31.03、37.15±10.57、3.06±0.13μg/g,加标回收率在90%~110%之间。结论:方法操作简便,测定值稳定,结果令人满意,为相关工作人员初步提供了正常SD大鼠神经组织中钙、镁、铁、锌、铜的参考值范围。     

同一消解液同时测定中成药中砷汞铅铜含量的研究

以新癀片为对象采用同一的微波、酸消解法，用还原气化冷原子荧光法测汞；用氢化发生-电感耦合等离子体原子发射光谱法测砷；用石墨炉原子吸收法测铅和铜。并用加际消化和国家标准物质的测定，证明方法准确可靠。     

Microstructure Evolution and Deformation Mechanisms of As-Cast Antibacterial Ti6Al4V-5Cu Alloy for Isothermal Forging Process

The hot workability behavior of antibacterial Ti6Al4V-5Cu alloy was investigated using a hot compression experiment in the temperature range of 790–1040 °C and strain rate of 10⁻³–10 s⁻¹ with a strain of 0.4. The deformation behavior of the alloy was characterized by Gleeble 3800 compression experiment, and the relationship among deformed microstructures and deformation parameters was established. The deformations of Ti6Al4V-5Cu alloy were temperature and strain rate-dependent. Higher temperature and lower strain rate made power dissipation efficiency (η) increase and reach 89%. The activation energies (Q) in the dual-phase (α + β) and single β phase regions were calculated as 175.43 and 159.03 kJ mol⁻¹, respectively. In the dual (α + β) phase region, with an increase in strain rate, flow-softening behavior was dominated, however in the single β phase region such as processing at 940 °C. Flow stress increased slightly in which work-hardening behavior was dominated (especially between strain rates of 10⁻³–1 s⁻¹). The deformation at various conditions exhibited different stress-strain profiles, providing an insight that work hardening and flow softening coexisted in Ti6Al4V-5Cu alloy. The relative intensity of oscillatory change in flow stress profile decreased as the strain rate decreased. The hot workability of Ti6Al4V-5Cu alloy was also accessed from the viewpoint of the sub-grain structure.     

PRK后房水中微量元素的变化

目的 通过测定准分子角膜切削（P）RK）术后1，2，3月兔眼房水中铜，锌，钙，镁，铁含量的变化，探讨其在PRK术后角膜创伤愈合中的作用。方法 健康新西兰大白兔12只（24眼）平均分成4组。每组3只（6眼），1组对照，另外3组行PRK术，切削深度为100μm。消融直径5.6mm。分别于术后1，2，3月抽取房水，测定铜，锌，钙，镁，铁含量。结果 PRK术后1个月时，钙和铁的含量降低，铁持续到术后3月时仍较低，术后1月锌的含量升高而钙的含量降低。镁及铜的含量没有变化。结论 锌的含量增加有利于创伤修复；铁含量减少提示铁参与角膜创伤修复过程且在角膜内再分布；钙在房水中降低体现了角膜能量代谢及能量利用加强。     

Deep Cryogenic Treatment Characteristics of a Deformation-Processed Cu-Ni-Co-Si Alloy

This paper investigated the influence of deep cryogenic treatments (DCT) on the tensile strength, elongation to fracture and conductivity of a deformation-processed Cu-Ni-Co-Si alloy. The tensile properties were measured using a mechanical testing machine. The conductivity was evaluated using a low-resistance tester. The microstructure and precipitated phases were analyzed using scanning electron microscopy (SEM), transmission electron microscopy (TEM), an energy dispersive spectrometer (EDS) and an X-ray diffractometer (XRD). The tensile strength, elongation to fracture and conductivity of the Cu-1.34Ni-1.02Co-0.61Si alloy before and after cold rolling at 47% reduction increased with increasing DCT time and tended to be stable at about 36 h. The microstructure became more uniform after the DCT. The grain size was refined and was smallest after DCT for 48 h. The DCT promoted the precipitation of the solid solution elements Ni, Co and Si from the Cu matrix to form many fine and evenly distributed 20–70 nm spherical second-phase particles in the grains and grain boundaries.