扶正培本系列方药在胃癌综合治疗中的临床与机理研究

[目的]探索扶正培本系列方药在胃癌综合治疗中的临床疗效。[方法]针对胃癌患者不同阶段临床特点和治疗的主要环节,在扶正培本治则指导下的系列治法与方药的临床作用的研究,有针对化疗毒付反应的健脾益肾冲剂、预防转移复发的扶正防癌口服液和针对晚期带瘤患者提高生活质量的养胃抗瘤冲剂。[结果]扶正培本系列方药对化疗药物具有明显的增效减毒作用,提高机体免疫功能,清除有害自由基,提高SOD活性,降低术后复发与转移,提高带瘤患者的生活质量延长生存期等作用[结论]扶正培本系列方药防治复发转移作用的可能分子机制在于：可以促进肿瘤细胞凋亡信号转导基因Fas蛋白和mRNA表达,降低FasL蛋白和mRNA表达;进而提高起始型Caspase-8的活性;同时提高凋亡调控基因Bax蛋白和mRNA表达,降低Bcl-2/Bax比例,从而减弱Bcl-2蛋白和mRNA表达抑制细胞凋亡的作用,降低肿瘤细胞线粒体膜电位△ψm和降低细胞内PH值,使细胞酸化,通过线粒体途径有效地放大了凋亡信号;最终活化Caspase-3导致细胞凋亡。     

卡铂碳包铁纳米磁性微球对移植性肝癌热疗疗效机制的研究

目的 卡铂Fe@C纳米笼壳聚糖微球 (C-Fe@C-CN) 对移植性肝癌模型具有较好的热疗效果,探讨热疗对肿瘤细胞治疗的分子机制.方法 用制备好卡铂Ve@C纳米笼壳聚糖微球 (C-Fe@C-CN) ,对50只移植性肝癌大鼠模型 (随机分为5组,A组生理盐水组、B组卡铂组,C组微球组,微球热疗30min D组和微球热疗60min E组) ,经肝动脉注射给药24h后,免疫组织化学法观察热疗对肝癌肿瘤细胞HSP70表达的影响,流式细胞术检测对肝癌细胞凋亡率及Fas蛋白表达的影响.结果 HSP70蛋白表达,A、B、c组 (n=6) 均为阴性,E组明显高于D组[ (96.11%±15.40%) n=6) vs (74.71%±13.85%) (n=6) ,p<0.05].D、E组肝癌细胞凋亡率[ (58.37%±13.84%) 、 (64.87%±15.72%) ]和Fas蛋白表达[ (35.23%±15.72%) 、 (38.45%±5.64%) ]较其他组显著增高 (P<0.01) ,D组与E组比较差异无显著性 (P>0.05) .结论 C-Fe@C-CN具有良好的磁靶向力和感应产热性能,加热可以诱导HSP70蛋白的大量产生,可以激活Fas基因诱导肝癌细胞凋亡,是一种潜在的抗肿瘤磁性纳米靶向热疗药物栽体.     

抑制性消减杂交筛选与克隆果蝇七氟烷敏感性相关基因

目的 采用抑制性消减杂交(SSH)方法筛选与克隆果蝇七氟烷敏感性相关的基因,以进一步研究吸人麻醉药的作用机制.方法 以对七氟烷敏感和耐药的果蝇品系为研究模型,以野生型黑腹果蝇作为对照,应用SSH方法筛选与吸人麻醉药七氟烷敏感性相关的候选基因.结果 筛选到的差异片段中,在敏感品系中高调的有77个.低调的有56个;在耐药品系中高调的有58个,低调的有52个;在敏感品系中高调而耐药品系中低调的有4个.经过与果蝇基因库比对,确定了其中大部分基因的功能,发现这些基因均非位于Y染色体上;与吸入麻醉药敏感性相关的基因大部分位于第2号染色体上.结论 本实验结果与先前有的学者用遗传学方法定位所得结果基本一致,七氟烷麻醉相关基因定位于2号染色体上,为常染色体显性遗传,并且果蝇对吸入麻醉药的敏感性在雌性与雄性间无差异,为进一步研究吸人麻醉药的作用机制提供了新的思路和方法.     

构建大学生党员先进性教育长效机制的实践和思考

保持大学生党员先进性是新时期高校学生党建工作的重大课题。为了构建大学生党员先进性教育长效机制,从思想政治教育、制度建设、党组织活动、社会实践、成才教育、作风建设等方面入手,不断增强大学生党员党性修养,使大学生党员真正树立自身先进性意识,使其成为社会主义事业合格建设者和可靠接班人。     

深圳市院办院管模式下人才培养互动机制的影响因素及对策

目的：分析深圳市院办院管模式下医院与社康中心人才培养互动机制中存在的问题,并针对性提出相关对策,为政府有关部门的决策提供参考。方法：收集2007年深圳市有关人才培养机制的各项政策,并进行社康中心工作人员问卷调查和知情人访谈,在此基础上进行分析。结论：医院与社康中心人才培养互动机制的影响因素很多,应当通过重视人才培养规划、鼓励和吸引人才、多种途径培养人才等方式促进人才培养互动机制的构建。     

29例严重药物不良反应病例分析及其赔偿机制的探讨

目的分析药物不良反应的相关因素,探讨其赔偿机制。方法对2005年1月至2007年12月发生的29例严重药物不良反应病例进行回顾性分析。结果严重药物不良反应发生于各年龄层,21例患者经及时治疗后好转,7例病情加重,1例有后遗症,导致的医疗费用支出平均达8491．95元,支付类别近一半为自费。结论药物不良反应难以避免,在加强监测、保障患者用药安全的同时,亟待建立相应的赔偿机制,以维护患者的利益。     

Gravitational dynamos and the low-frequency geomagnetic secular variation

Self-sustaining numerical dynamos are used to infer the sources of low-frequency secular variation of the geomagnetic field. Gravitational dynamo models powered by compositional convection in an electrically conducting, rotating fluid shell exhibit several regimes of magnetic field behavior with an increasing Rayleigh number of the convection, including nearly steady dipoles, chaotic nonreversing dipoles, and chaotic reversing dipoles. The time average dipole strength and dipolarity of the magnetic field decrease, whereas the dipole variability, average dipole tilt angle, and frequency of polarity reversals increase with Rayleigh number. Chaotic gravitational dynamos have large-amplitude dipole secular variation with maximum power at frequencies corresponding to a few cycles per million years on Earth. Their external magnetic field structure, dipole statistics, low-frequency power spectra, and polarity reversal frequency are comparable to the geomagnetic field. The magnetic variability is driven by the Lorentz force and is characterized by an inverse correlation between dynamo magnetic and kinetic energy fluctuations. A constant energy dissipation theory accounts for this inverse energy correlation, which is shown to produce conditions favorable for dipole drift, polarity reversals, and excursions.     

Recombinant-activated coagulation factor VIIa (NovoSeven): current development

Recombinant activated coagulation factor VII (rFVIIa) was developed initially for treatment of patients with hemophilia and neutralizing antibodies ("inhibitors") to coagulation factors VIII or IX. Owing to the unique and selective mechanism of action of rFVIIa and encouraged by clinical experience with other circumstances of inadequate hemostasis, a broad development program has been pursued to test potential efficacy and evaluate safety of this biologic for indications other than hemophilia. This review summarizes the current development of rFVIIa, focusing on results of prospective, randomized clinical trials.     

Incidental magnetization transfer effects in multislice brain MRI at 3.0T

PURPOSE: To evaluate the effect of incidental magnetization transfer (iMT) in multislice brain imaging at 3.0T. MATERIALS AND METHODS: The contribution of iMT to multislice brain MRI was evaluated at 3.0T. In 10 normal subjects we obtained multislice fast spin-echo (FSE) MR images using a 16-echo pulse train without an off-resonance MT pulse at 3.0T and 1.5T. We quantified the extent of iMT by calculating the iMT ratio (iMTR). RESULTS: We found that the iMT contrast (iMTC) has a greater effect at 3.0T. As the number of slices increased in multislice FSE imaging, the difference between two field strengths became larger. Compared to WM structures, however, the difference in iMT effect between 1.5T and 3.0T was smaller in the case of GM structures. CONCLUSION: The iMTC has a greater effect at 3.0T. The strength of the iMT is different for different tissue types and also varies according to the number of slices used.