盐酸法舒地尔对脑梗死患者的疗效及对血清中lL-1β、TNF-α和RHO激酶影响的观察

目的:本实验观察盐酸法舒地尔对脑梗死患者的治疗作用及对血清中白细胞介素-1β(IL-1β)、肿瘤坏死因子-α(TNF-α)和RHO激酶的影响,为临床工作提供理论帮助.方法:选取我院住院诊治的脑梗死患者186例,依患者的入院顺序分为两组,观察组共93例,在常规治疗基础上加用盐酸法舒地尔治疗,对照组共93例,只应用常规治疗...     

酚磺乙胺联合磷酸铝凝胶治疗新生儿上消化道出血临床分析

目的:探讨新生儿上消化道出血临床治疗效果。方法:采用回顾性分析的方法,分析我院收治的新生儿上消化道出血病例临床资料,依据治疗方式不同分为对照组(常规治疗组)30例和观察组[酚磺乙胺注射液(止血敏)联合磷酸铝凝胶(吉福士)治疗组]50例。结果:观察组患儿止血时间、胃管引流无血性液天数、粪便转黄天数、隐血试验阴性天数均明显低于对照组,同时观察组的治疗效果上明显的好于对照组,P<0.05,差异均有统计学意义。结论:止血敏联合吉福士治疗新生儿上消化道出血,患儿止血效果明显,值得临床推广应用。     

复方丹参片质量标准的沿革与质控技术的研究进展

综述复方丹参片制法工艺与质量控制标准的沿革,以及近年来对复方丹参片质量控制技术的研究进展;进一步分析其存在问题,并提出应提倡丹参多成分的检测、增加三七指标成分的测定、补充冰片的质量控制标准及加强指纹图谱研究等改进建议。     

不同浓度硫化氢托马斯液心脏保存效果的实验研究

目的探讨含有各种浓度硫化氢(H2S)的HST(H2S St.Thom asⅡsolutions)液对大鼠离体心脏的保存作用。方法将32只SD大鼠随机平均分为4组,分别用托马斯(St.Thom asⅡsolutions,STH)液(Ⅰ组)、含4×10-2mmol/L NaHS的HST液(Ⅱ组)、含4×10-1mmol/L NaHS的HST液(Ⅲ组)和含4mmol/L NaHS的HST液(Ⅳ组)对心脏进行保存。采用Langendorff心脏灌注和工作模型装置进行心脏功能测定,比较6 h后心功能恢复率以及能量变化、心肌含水量,观察心肌超微结构改变。结果心脏保存6 h后,Ⅳ组左心室功能损伤严重,Ⅱ、Ⅲ组左心室功能损伤较轻,其中Ⅲ组最轻。Ⅲ组冠状动脉流量(CF)恢复率较Ⅰ、Ⅳ组好;Ⅰ组心肌中ATP、乳酸(LD)、糖原含量及心肌含水量与其它3组比较,差异有统计学意义;Ⅳ组心脏复跳时间较Ⅰ组为长;心肌超微结构Ⅲ组损伤最轻;Ⅲ组心肌保存良好。结论HST保存液对大鼠心脏的保存在6 h内有明显的保护作用,效果优于STH液;含4×10-1mmol/L NaHS的HST液保存效果较好,而高浓度H2S对心肌有损害作用。     

Improving Anti-Coking Properties of Ni/Al2O3 Catalysts via Synergistic Effect of Metallic Nickel and Nickel Phosphides in Dry Methane Reforming

A series of NiP-x/Al₂O₃ catalysts containing different ratio of metallic nickel to nickel phosphides, prepared by varying Ni/P molar ratio of 4, 3, 2 through a co-impregnation method, were employed to investigate the synergistic effect of metallic nickel-nickel phosphides in dry methane reforming reaction. The Ni/Al₂O₃ catalyst indicates good activity along with severe carbon deposition. The presence of phosphorus increases nickel dispersion as well as the interaction between nickel and alumina support, which results in smaller nickel particles. The co-existence of metallic nickel and nickel phosphides species is confirmed at all the P contained catalysts. Due to the relative stronger CO₂ dissociation ability, the NiP-x/Al₂O₃ catalysts indicate obvious higher resistance of carbon deposition. Furthermore, because of good balance between CH₄ dissociation and CO₂ dissociation, NiP-2/Al₂O₃ catalyst exhibits best resistance of carbon deposition, few carbon depositions were formed after 50 h of dry methane reforming.     

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.     

Test and Microstructural Analysis of a Steel Slag Cement-Based Material Using the Response Surface Method

In this study, the silica fume replacement rate, fly ash replacement rate, and curing temperature were regarded as the independent variables, and the compressive and flexural strengths were regarded as the response values. The response surface method was used to construct the response surface polynomial regression model and obtain the optimal preparation parameters of a steel slag cement-based gel slurry (SCGS). The univariate and multivariate effects on the SCGS’s strength were investigated via analysis of variance and a three-dimensional surface model, and the hydration products and strength development law were characterized via scanning electron microscopy and X-ray diffraction. The actual compressive strengths at 3 and 28 d of age were 31.78 and 53.94 MPa, respectively, which were close to the predicted values (32.59 and 55.81 MPa, respectively), demonstrating that the optimized strengths were accurate and reliable. Further, the hydration reaction rate of SiO₂ in the silica fume and the physical filling effect of the inert components of fly ash and steel slag under the optimal parameters were the key factors for the early strength of the material. Moreover, continuous C₃S hydration in steel slag and the continuous excitation of the volcanic ash properties of fly ash were important factors for the later strength.     

The East Africa Consortium for human papillomavirus and cervical cancer in women living with HIV/AIDS

The East Africa Consortium was formed to study the epidemiology of human papillomavirus (HPV) infections and cervical cancer and the influence of human immunodeficiency virus (HIV) infection on HPV and cervical cancer, and to encourage collaborations between researchers in North America and East African countries. To date, studies have led to a better understanding of the influence of HIV infection on the detection and persistence of oncogenic HPV, the effects of dietary aflatoxin on the persistence of HPV, the benefits of antiretroviral therapy on HPV persistence, and the differences in HPV detections among HIV-infected and HIV-uninfected women undergoing treatment for cervical dysplasia by either cryotherapy or LEEP. It will now be determined how HPV testing fits into cervical cancer screening programs in Kenya and Uganda, how aflatoxin influences immunological control of HIV, how HPV alters certain genes involved in the growth of tumours in HIV-infected women. Although there have been challenges in performing this research, with time, this work should help to reduce the burden of cervical cancer and other cancers related to HIV infection in people living in sub-Saharan Africa, as well as optimized processes to better facilitate research as well as patient autonomy and safety.

KEY MESSAGES

• The East Africa Consortium was formed to study the epidemiology of human papillomavirus (HPV) infections and cervical cancer and the influence of human immunodeficiency virus (HIV) infection on HPV and cervical cancer.
• Collaborations have been established between researchers in North America and East African countries for these studies.
• Studies have led to a better understanding of the influence of HIV infection on the detection and persistence of oncogenic HPV, the effects of dietary aflatoxin on HPV detection, the benefits of antiretroviral therapy on HPV persistence, and the differences in HPV detections among HIV-infected and HIV-uninfected women undergoing treatment for cervical dysplasia by either cryotherapy or LEEP.

     

MicroRNA-144在结肠癌中的表达水平及临床意义

目的探讨microRNA-144在结肠癌中的表达水平及其与临床病理特征的相关性。方法提取38例结肠癌及其正常结肠黏膜组织标本的总RNA,采用逆转录实时荧光定量聚合酶链反应(RT-qPCR)方法检测microRNA-144的表达量,并分析其与临床分期、分化程度、淋巴结转移等临床病理特征的关系。结果癌与癌旁正常结肠黏膜组织比较,microRNA-144在癌组织中高表达,相对表达量的中位数是2.30。其表达与TNM分期(P<0.05)、分化程度(P<0.05)相关,受试者工作特征(ROC)曲线分析显示,以相对表达量1.70为临界点时,microRNA-144作为评价结肠癌细胞分化程度,敏感性为88%,特异性为61.5%。结论 microRNA-144在结肠癌中的异常表达可能与结肠癌的发生、发展有关。     

植物多糖对S_（180）细胞膜脂肪酸组成的影响

为了进一步探讨植物多糖与膜磷脂的关系，采用毛细管柱气相色谱法观察到在茯苓多糖（ＰＰＳ），刺五加多糖（ＡＳＰＳ）与Ｓ＿１８０细胞一同温育２４ｈ后，Ｓ＿１８０细胞膜中性脂的脂肪酸组成和不饱和性均未有明显变化。磷脂的脂肪酸组成发生明显改变，花生四烯酸（Ｃ＿（２０∶４），Ｐ＜０．０５）和豆蔻酸（Ｃ＿（１４∶０），Ｐ＜０．０１）的含量降低。上述结果与氨甲喋呤作用相似。讨论了膜磷脂脂肪酸组成变化的意义，认为在ＰＰＳ、ＡＳＰＳ的抗肿瘤机理中，细胞膜磷脂生化特性的改变是重要环节。