我国高校教育教学评估的文化历程

我国高校教育教学评估,虽历经十几年,但因具有行政强制色彩,评估仅仅是一种工具和手段,因而难以形成积极健康的"质量文化".结合高校教育教学实际,我国高校教育教学评估必将经历热闹的"评估运动",尴尬的"评估文化",最终形成从容的高校"质量文化".     

用菲涅耳衍射理论分析圆孔(屏、球)衍射

用菲涅耳衍射理论分析圆孔(屏、球)衍射的复振幅分布,根据其复振幅分布式得到的圆孔(屏、球)衍射成像公式与半波带法和矢量法得到的结果一致。并从理论上解释了圆孔衍射和圆屏(球)衍射图样中心的异同和泊松亮斑的成因。这种方法加深了我们对衍射成像过程的认识。     

模糊语言在商务英语信函中的应用及功效

文章讨论了多种典型的国际商务交往背景下模糊语言在商务英文信件中的应用,通过实例介绍了模糊语言在特定情境下的使用及其功用,着重分析模糊语言如何有效地为国际商务人员在商务交往中争取更大的灵活性,同时提出了一些可能会因使用模糊语言而产生的负面影响,为以英语作为交流工具的国际商务人员更恰当地运用模糊语言提供一些参考.     

澳大利亚民族文化心理及其在词汇中的映射

澳大利亚民族求新、求曲、求特、求简的文化心理和乐观、率直、开放、包容、自信的民族秉性,赋予澳大利亚英语以鲜明的特色和个性,并通过词汇最忠实、最生动地映射出来.     

Danshen protects endothelial progenitor cells from oxidized low-density lipoprotein induced impairment

In this study,we examined the protective effects of Danshen both on endothelial progenitor cells(EPCs) in patients with hypercholesterolemia and on in-vitro EPCs of healthy volunteers.In the clinical study,we randomly divided 24 subjects with hypercholesterolemia into two groups(the control group and the Danshen-treated group).At the end of two weeks of treatment,the EPC cellular functions of both groups were tested.The results indicated that,compared to the control group,EPCs in the Danshen-treated group showed significantly better cellular functions,which was manifested in the cloning number,the proliferation capacity,the number of EPC adhesions,and cell migration.In the subsequent in-vitro experiments,EPCs were treated with vehicle,oxidized low-density lipoprotein(Ox-LDL,100 μg/ml),or Ox-LDL(100 μg/ml) plus different concentrations of Danshen(Danshensu 2,10,or 50 μg/ml,respectively) for 24 h.The results showed that Danshen treatments can prevent the detrimental effects of Ox-LDL on EPC cellular functions measured by proliferation capacity(0.24±0.08,0.37±0.11,0.30±0.04 vs.0.13±0.02,P0.05,P0.01,and P0.01,respectively),and adhesion ability(63.00±11.60,70.00±10.80,85.50±11.41 vs.40.50±6.85,all P0.01).Compared to the group treated with Ox-LDL alone,Danshen treatment significantly decreased the lipid peroxidation end product malondialdehyde(MDA) [(4.34±0.54),(3.98±0.47),(3.46±0.31) vs.(5.57±0.64) nmol/ml,all P0.01],increased the production of superoxide dismutase(SOD) [(29.74±0.71),(31.09±0.83),(30.41±0.65) vs.(14.76±3.99) U/ml,all P0.01],and lowered the expression of interleukin-6(IL-6) [(24.62±7.69),(27.04±3.14),(33.38±18.86) vs.(230.67±33.53) pg/ml,all P0.01] and tumor necrosis factor-α(TNF-α) [(41.72±6.10),(17.02±6.82),(3.73±2.26) vs.(228.71±41.53) pg/ml,all P0.01] in Ox-LDL treated EPCs.These results suggest that Danshen may exert a protective effect through its antioxidant and anti-inflammatory features.     

Relation of uric acid levels to aortic root dilatation in hypertensive patients with and without metabolic syndrome

Objective:Uric acid(UA) is considered to be a powerful predictor of cardiovascular risk and hyperuricemia might be involved in the metabolic syndrome(MS).This study aims to investigate the relation between UA levels and aortic root dilatation.Methods:A total of 348 hypertensive patients [age(67.5±9.8) years] with or without MS were included in the study.The aortic root diameters at the aortic annulus,the sinuses of Valsalva,the sinotubular junction,and the proximal part of the ascending aorta were measured using a two-dimensional(2D) echocardiography.Serum UA levels were also measured for all patients.Results:A high UA level is independently associated with aortic root diameters at the sinuses of Valsalva(P=0.001) and the proximal ascending aorta(P0.0001) in the hypertensive patients without MS.In contrast,aortic root diameters were not significantly related to UA levels in the hypertensive patients with MS.Furthermore,increased UA levels were associated with an increased risk for aortic root dilatation in the patients without MS(sex-adjusted hazard ratio 1.75,95% confidence intervals(CI) 1.27-2.41),but not in those with MS.Conclusions:This study demonstrated an independent relationship between the aortic root dimensions and increased levels of serum UA in the hypertensive patients without MS.Further understanding of the mechanisms underlying these associations may allow a clearer interpretation of the potential value of specific urate-lowering treatment on cardiovascular disease.     

Preparation of high-affinity rabbit monoclonal antibodies for ciprofloxacin and development of an indirect competitive ELISA for residues in milk

A convenient competitive enzyme-linked immunosorbent assay (ELISA) for ciprofloxacin (CPFX) was developed by using rabbit monoclonal antibodies (RabMAbs) against a hapten-protein conjugate of CPFX-bovine serum albumin (BSA). The indirect competitive ELISA of CPFX had a concentration at 50% inhibition (IC₅₀) of 1.47 ng/ml and a limit of detection (LOD) of 0.095 ng/ml. The mAb exhibited some cross-reactivity, however, not so high with enrofloxacin (28.8%), ofloxacin (13.1%), norfloxacin (11.0%), fleroxacin (22.6%), and pefloxacin (20.4%). And it showed almost no cross-reactivity with other antibiotics or sulfonamides evaluated in this study. The competitive ELISA kit developed here could be used as a screening tool to detect and control illegal addition of CPFX in food products. This kit had been applied to milk detection and the recovery rates from samples spiked by CPFX were in a range of 63.02%–84.60%, with coefficients of variation of less than 12.2%.     

Case Report :Surgical intervention of severe post-ERCP-pancreatitis accompanied with duodenum perforation

Endoscopic retrograde cholangiopancreatography (ERCP) is a procedure widely used to diagnose and treat conditions of biliary or pancreatic ductal system. The post-ERCP severe acute pancreatitis (SAP) accompanied with duodenum perforation is rare but serious, remaining a challenge in clinic. In this study we report two such cases. Two Chinese women were treated for clinical suspicion of bile duct obstruction and underwent ERCP after admission. Both developed duodenum perforation and SAP after ERCP, and were ...     

树立科学发展观探索高校学生党建工作新模式

面对高等教育日益大众化、综合化、国际化的现状,加强和改进学生党建是高校基层党建面临的重大课题。本文在分析当前高校学生党建面临问题的基础上,从科学发展观的本质“以人为本”的指导思想出发,从思想观念、活动内容、工作机制、组织载体、队伍建设五个方面对当前形势下高校学生党建工作进行了创新性探索。     

论美国利益团体在马歇尔计划形成中的作用

马歇尔计划不只是美国政府内少数精英设计出来的,而且在相当程度上也是美国一些利益集团加以推进的结果.这些美国商业、劳工等利益团体不但通过发布声明、发表演讲支持马歇尔计划,而且还组建哈里曼委员会直接参与到该计划政策的制订中,对后来马歇尔计划的实施产生了重要影响.