过渡金属配合物构型畸变探究

分析了八面体配合物和四面体配合物畸变的原因,给出了判断八面体配合物和四面体配合物畸变的一般方法:配合物是否发生畸变要看中心离子电子云是否对称分布,若对称分布,就具有规则的八面体或四面体构型,否则,将会发生变形.     

青岛隆基汇源基坑冻结法支护方案分析

在青岛隆基汇源基坑的支护中,遇到了传统的基坑支护方案难以解决的问题.这种情况下,考虑到了应用冻结法施工的可能,对应用冻结法支护方案进行支护的可行性作了分析,介绍了冻结法的原理、特点,冻结壁的设计、施工工序、主要技术参数等.     

基于经济快速增长下的上海高等职业技术教育发展的思考

上海经济发展要求高等职业技术教育提供的人才数量增大、素质提高,人才结构进行调整.高等职业技术教育要在办学定位、管理体制、专业设置、课程设置、人才培养模式等方面进行深入的探讨,为上海经济发展提供所需人才.     

隔爆对旋式局部通风机控制磁力起动器的研究

煤矿井下局部通风机是保证煤矿井下安全生产的重要设备.对旋局部通风机是一种用途广泛的新型局部通风机,具有结构紧凑、噪音小、效率高、反风性能好的特点.研制与其配套的起动和控制设备是十分必要的.     

In vitro assessment of gastrointestinal viability of two photosynthetic bacteria, <Emphasis Type="Italic">Rhodopseudomonas palustris</Emphasis> and <Emphasis Type="Italic">Rhodobacter sphaeroides</Emphasis>

The objectives of this study were to assess the potential of two photosynthetic bacteria （PSB）, Rhodopseudomonas palustris HZ0301 and Rhodobacter sphaeroides HZ0302, as probiotics in aquaculture. The viability of HZ0301 and HZ0302 in simulated gastric transit conditions （pH 2.0, pH 3.0 and pH 4.0 gastric juices） and in simulated small intestinal transit conditions （pH 8.0, with or without 0.3% bile salts） was tested. The effects of HZ0301 and HZ0302 on the viability and permeability of intestinal epithelial cell in primary culture of tilapias, Oreochrornis nilotica, were also detected. All the treatments were deter- mined with three replicates. The simulated gastric transit tolerance of HZ0301 and HZ0302 strains was pH-dependent and correspondingly showed lower viability at pH 2.0 after 180 min compared with pH 3.0 and pH 4.0. Both HZ0301 and HZ0302 were tolerant to simulated small intestine transit with or without bile salts in our research. Moreover, there was no significant difference （P〉0.05） among three treatments including the control and the groups treated with HZ0301 or HZ0302 both in intestinal epithelial cell viability and membrane permeability, showing no cell damage. In summary, this study demonstrated that HZ0301 and HZ0302 had high capacity of upper gastrointestinal transit tolerance and were relatively safe for intestinal epithelial cells of tilapias.     

Cell therapy in congestive heart failure

Congestive heart failure （CHF） has emerged as a major worldwide epidemic and its main causes seem to be the aging of the population and the survival of patients with post-myocardial infarction. Cardiomyocyte dropout （necrosis and apoptosis） plays a critical role in the progress of CHF; thus treatment of CHF by exogenous cell implantation will be a promising medical approach. In the acute phase of cardiac damage cardiac stem cells （CSCs） within the heart divide symmetrically and/or asymmetrically in response to the change of heart homeostasis, and at the same time homing of bone marrow stem cells （BMCs） to injured area is thought to occur, which not only reconstitutes CSC population to normal levels but also repairs the heart by differentiation into cardiac tissue. So far, basic studies by using potential sources such as BMCs and CSCs to treat animat CHF have shown improved ventricular remodelling and heart function. Recently, however, a few of randomized, double-blind, placebo-controlled clinical trials demonstrated mixed results in heart failure with BMC therapy during acute myocardial infarction.     

日本国立大学校长角色的历史演变述论

在日本国立大学的发展史上,校长的职能、角色及选拔方式都发生过阶段性的发展和变化.这些发展和变化既是国立大学自身发展的体现,同时也是国立大学适应和应对外部环境变化及要求的结果.值得特别关注的是,在法人化改革以来,国立大学校长肩负着大学运营和大学法人经营的双重职责,兼具管理者和经理人的双重角色,集多重权力于一身,形成了一种校长治校的体制.     

我国"世界一流大学建设"的高等教育政策评价

为使我国有若干所大学进入世界一流大学的行列,我国政府和大学正在向着这一目标进发,制定了许多政策,采取了许多行动.笔者试图就我国"建设世界一流大学"这一高等教育政策进行评价.     

“可能”、“会”的“或然性”高低及特点

“可能”、“会”都可表示估计将成事实与否,但其“或然性”并不相等。“会”表推测性肯定,而“可能”只是个表肯定性不强的词语,因此就其所反映的“或然性”性质而言,“会”是个点,其值为“1”,而“可能”是个弹性区间,其值徘徊在“0．5”左右。