关于多项选择题的讨论──外语教育语言学研究之四

多项选择题是现代外语测试中运用得最多的题型之一。本文就这种题型产生的背景及其构成做了综合性的阐述；并对设计这种试题应注意的一些问题进行了探讨。此外，本文还针对多项选择题在外语教学中的应用问题提出了一些看法和建议。     

两种不同淋巴细胞分离液对脐带血单核细胞的提取及后期诱导培养CIK细胞的影响

目的:研究两种不同的淋巴细胞分离液对脐带血单核细胞的分离效果及后期对CIK细胞的诱导培养的影响。方法:分别使用国产TBD以及进口GE healthcare牌淋巴细胞分离液分离提取脐带血单核细胞,用悬浮细胞培养法诱导培养脐带血单核细胞形成CIK细胞,再用血球计数板及台盼兰染色法检测细胞密度及活率。结果:国产的TBD牌所分离的单核细胞分层较清楚,并且方便提取,而使用进口GE healthcare的淋巴细胞分离液提取的单核细胞数量较多,但经过后期诱导培养CIK细胞发现两种分离液提取的细胞培养到后期数量逐渐接近。结论:国产TBD牌淋巴细胞分离液在用于脐带血淋巴细胞分离提取时较进口GE healthcare牌经济,并且细胞提取方便,后期培养效果无明显差别。     

Population Marginal Means in the Linear Model: An Alternative to Least Squares Means

The parameter concept in the term least squares mean is defined and given the more meaningful name population marginal mean; and its estimation is discussed.     

Stem Cell Research and Biopsychosocial Perspectives From the Sciences,Government, and Community

Stem cell research is a fairly new technological advancement that has been accompanied by a wide range of support and scrutiny. On February 22, 1997, Dolly, the sheep, was successfully cloned in Scotland, while controversy erupted over the moral, ethical, and social implications of creating life. Though many agree that using human embryos is morally acceptable, the United States, Canada, Australia, United Kingdom, and European countries have passed legislation limiting or prohibiting stem cell research. This article considers the biopsychosocial benefits and potential hazards of stem cell research and how this research may affect social work practice.     

Configural Frequency Analysis: the Search for Extreme Cells

Configural Frequency Analysis (CFA) asks whether a cell in a cross-classification contains more or fewer cases than expected with respect to some base model. This base model is specified such that cells with more cases than expected (also called types) can be interpreted from a substantive perspective. The same applies to cells with fewer cases than expected (antitypes). This article gives an introduction to both frequentist and Bayesian approaches to CFA. Specification of base models, testing, and protection are discussed. In an example, Prediction CFA and two-sample CFA are illustrated. The discussion focuses on the differences between CFA and modelling.     

艺术创造中情感的流动、阻遏与控制

艺术是传达情感的 ,而情感的传达应当是美的。情感之美 ,美在流动与阻遏之中。而这又来自于创造主体对情感的控制。情感的控制 ,有助于产生情感的流动与阻遏 ,并使情感得以强化与深化 ,使艺术的情感传达产生美与力量     

论江泽民的国家创新体系思想

江泽民的国家创新体系思想厚实凝重。包含对思维创新和理论创新的前提基础作用、制度创新和管理创新的保障服务作用、技术创新的动力作用、知识创新和人才教育创新的后续支持作用的全面而又深入的论述。江泽民的国家创新体系思想直接启动了国家“十五”计划《纲要》关于“建设国家创新体系”、“建立国家知识创新体系,促进知识创新工程”的“跨越式发展”的宏伟战略。     

中国樱桃矮变株茎、叶的解剖结构

利用常规石蜡制片法对中国樱桃矮变株和正常株的茎、叶进行了解剖结构研究．结果表明，中国樱桃矮变株由于其茎、叶结构发生了变异而使其具有一定的矮化作用，故建议定名为中国樱桃短枝型或短枝樱桃较合适．     

载入海藻糖红细胞冷冻干燥保存的实验研究

探讨载入海藻糖对红细胞冷冻干燥保存的效果.利用硫酸蒽酮比色法测量细胞内海藻糖的含量,对载入海藻糖的红细胞进行了冷冻干燥保存.结果表明,细胞载入海藻糖的最高浓度为35mmol/L,经冷冻干燥后的细胞回收率与血红蛋白回收率提高非常明显,分别为冷冻干燥前的59.78±4.51%和57.49±3.69%;渗透脆性与新鲜红细胞无显著差异.载入海藻糖对红细胞的冷冻干燥保存效果有密切作用.     

哺乳动物干细胞研究进展

综述了哺乳动物胚胎干细胞的研究历史和进展,包括已成功分离出干细胞的动物和材料,分离和分化抑制的方法,并简单介绍了干细胞培养过程中存在的问题和改善情况.