Allograftic bone marrow-derived mesenchymal stem cells transplanted into heart infarcted model of rabbit to renovate infarcted heart

Objective: To investigate the directed transplantation of allograftic bone marrow-derived mesenchymal stem cells (MSCs) in myocardial infarcted (MI) model rabbits. Materials and Methods: Rabbits were divided into 3 groups, heart infarcted model with MSCs transplanted treatment (MSCs group, n=12), heart infarcted model with PBS injection (control group, n=20), sham operation with PBS injection (sham group, n=l 7). MSCs labelled by BrdUrd were injected into the MI area of the MSCs group. The same volume of PBS was injected into the MI area of the control group and sham group. The mortality, LVIDd, LVIDs and LVEF Of the two groups were compared 4 weeks later. Tropomyosin inhibitory component (Tn I) and BrdUrd immunohistochemistry identified the engrafted cells 4 weeks after transplantation. Result: The mortality of the MSCs group was 16.7% (2/12), and remarkably lower than the control group's mortality [35% (7/20) (P＜0.05)].Among the animals that survived for 4 weeks, the LVIDd and LVIDs of the MSCs group after operation were 1.17±0.21 cm and 0.74±0.13 cm, and remarkably lower than those of the model group, which were 1.64±0.14 cm and 1.19±0.12 cm (P＜0.05); the LVEF of the MSCs group after operation was 63±6%, and remarkably higher than that of the model group,which was 53±6% (P＜0.05). Among the 10 cases of animals that survived for 4 weeks in the MSCs group, in 8 cases (80%),the transplanted cells survived in the non MI, MI region and its periphery, and even farther away; part of them differentiated into cardiomyocytes; in 7 cases (70%), the transplanted cells participated in the formation of blood vessel tissue in the MI region. Conclusion: Transplanted allograftic MSCs can survive and differentiate into cardiomyocytes, form the blood vessels in the MI region. MSCs transplantation could improve the heart function after MI.     

民国时期留日学生的学科专业特点分析

留日教育是民国时期留学教育的重要组成部分，留日学生的学科和专业结构发生了一系列的变化，以此为对象，考察和分析民国留日留学生所学学科专业特点及其成因，并试图分析民国政府在留日学生学科和专业结构不断完善过程中的推动作用。     

英语听力训练中的预测法

就英语听力教学中学生普遍存在的问题，浅述应用听力预测法实施教学。培养学生采用预测法，达到提高英语听力的理解能力。     

组成于平行机和批处理机的二阶段混合流水作业问题

A hybrid two-stage flowshop scheduling problem was considered which involves m identical parallel machines at Stage 1 and a burn-in processor M at Stage 2, and the makespan was taken as the minimization objective. This scheduling problem is NP-hard in general. We divide it into eight subcases. Except for the following two subcases： （1） b≥ an, max{m, B} 〈 n; （2） a1 ≤ b ≤ an, m ≤ B 〈 n, for all other subcases, their NP-hardness was proved or pointed out, corresponding approximation algorithms were conducted and their worst-case performances were estimated. In all these approximation algorithms, the Multifit and PTAS algorithms were respectively used, as the jobs were scheduled in m identical parallel machines.     

浅谈医院文化建设

医院文化是增强医院竞争力的客观要求,也是医院发展的重要保证。充分调动医院员工的积极性和创造性,提高医院的技术水平和服务质量,更好地服务于人民群众,促进医院知名度和美誉度的提高,是医院文化的重要内容。在市场经济条件下,不断充实医院的文化内涵,形成良好的人文环境,是提高医院竞争力和社会经济效益的保障。     

俄罗斯远程教育的发展

俄罗斯远程教育在教学和组织模式、远程教育技术、远程教育发展战略探索以及远程教育培训等方面均有着长足的发展,并取得了一定的成效和经验。这为我国大力促进社会化远程教育体系和运行机制的建设,实现更为有效的运作模式提供了重要的范例。     

学习型组织有效性评价

评价学习型组织有效性,应根据学习型组织的定义与特征以及企业的实际情况制定切实可行地评价指标,既要保证评价的客观性,正确性,又要在做法上力求简单,方便操作。学习型组织测评的基本方法是:     

关键能力培养及评估:澳大利亚的认识与实践

关键能力培养及评估是20世纪木国际职业教育界重点关注的问题之一。澳大利亚对此较早进行了理论与实践探索，其学者、职业教育与培训机构和学生从不同角度对关键能力的培养及评估提出不同认识，不同类型职业教育与培训机构的实践模式也各具特色。为应对面临的挑战，澳大利亚各界仍要经历较长的探索过程。     

自举式线性电压形成电路的补尝系数

本文引入补偿系数来描述自举式线性电压形成电路的四种补偿状态．     

用改进的元胞自动化模型模拟不同信号灯控制策略下的交通流

Traffic flows controlled by traffic light strategies were investigated via a cellular automaton model with anticipation, which is suitable for describing urban traffic. Three kinds of strategies, i. e., synchronized, green-wave and random switching lights, were designed, simulated and compared with each other. It is shown that the green-wave strategy is only valid at lower density and there is not an effective way with the three strategies to improve the efficiency of traffic flow at high density.