A complete sequence and comparative analysis of a SARS-associated virus(Isolate BJ01)

Severe Acute Respiratory Syndrome (SARS) is a newly identified infectious disease[1—5]. The global outbreak of SARS has been threatening the health of people worldwide and has killed 353 people and infected more than 5462 in 27 countries, as reported by WHO on April 29, 2003 (http://www.who.int/csr/sarscountry/en). Although it has been recognized that a variant of virus from the family of coronavirus might be the candidate pathogen of SARS[1—5], its identity as the unique pathogen sti…     

SARS流行与中国都市化的反思

SARS病毒在中国一些高都市化区域的高发 ,叫人不得不重提都市化这一老生常谈的问题。大都市里的居民难于呼吸到新鲜空气的原因有三个方面 ,即目前城市的建筑有缺陷 ,许多大都市空气的自我更新能力在逐步弱化 ,且与外围的空气缺少互动性。并结合有关专家的看法 ,提出了几点改进意见。     

Effects of hyaluronic acid－chitosan－gelatin complex on the apoptosis and cell cycle of L929 cells

With the development in the field of tissue engineering, the interaction between biomaterials and cells has been deeply studied. Viewing the cells seeded on the surface of materials as an organic whole, cell cycle and apoptosis are analyzed to deepen the study of cell compatibility on biomaterials, while cell proliferation and differentiation are studied at the same time. In this paper, hyaluronic acid is incorporated into the chitosan-gelatin system. Propidium iodide (PI) was used in cell cycle analysis and the double-staining of cells with annexin-V and PI was applied in cell apoptosis analysis. The results show that incorporated hyaluronic acid shortens the adaptation period of cells on the material surface, and then cells enter the normal cell cycle quickly. In addition, added hyaluronic acid inhibits cell apoptosis triggered by the membranes. Therefore, hyaluronic acid improves the cell compatibility of chitosan-gelatin system and benefits the design of biomimetic materials.     

Building of hFⅨ transgenic mice by spermatogenic cells

Human FⅨ expression vector pCMVⅨ was packaged by effectene^TM reagent and injected into mice seminiferous tubules with glass pipettes.The expressional frame of pCMVⅨ was examined by PCR and Southern blotting among 41 progenies.There were 2(4%) mice being integrated with hFⅨ gene into chromosomes.4.6ng/mL of hFⅨ protein was expressed in plasma of one mouse,which was tested by ELISA.We demonstrated that building of transgenic animals by spermatogonial stem cells is an efficient method.Meanwhile,it has also been proved to be an alternative choice for mammary gland bioreactor.     

新型电液激振装置的性能研究

结合电气与液压传动的性能优势，开发出电液激振装置，推导出该装置相关参数的相互关系式。经试验得出，激振装置的振动频率、振幅、压强、流量可以根据需要进行调节。可成为煤矿、冶金、建筑等行业振动设备的一种新型激振装置。     

新疆城乡居民两周就诊影响因素的分析

利用新疆维吾尔自治区卫生服务家庭入户调查数据，采用多因素logistic回归模型分析15岁及以上城乡居民两周就诊影响因素，结果表明：在控制居民健康状况时，性别、婚姻状况、文化、职业、收入、恩格尔系数及是否患慢性病对城市居民的就诊概率有统计学意义。农村居民两周就诊受到性别、年龄、婚姻状况、恩格尔系数、就诊距离及是否患慢性病等因素的影响。     

基于ADO接口和VC++的数据库应用系统开发

通过一个基于ADO接口和VC 编程语言的数据库查询系统的开发过程，介绍了对OLE DB和ADO的理解，提倡使用ADO开发数据库应用系统。     

西部地区科技创新现状及对策研究

本文分析了国内外科技创新形势，对西部地区，特别是陕西、四川、重庆区域的科技创新能力进行重点研究，通过对比指出西部科技创新中所存在的体制、机制方面的问题，提出了西部地区加强科技创新促进经济发展的若干对策。     

桩端压力注浆桩在卵石层中的应用

灌注桩采用桩端压力灌浆新技术后，能大幅度地提高基桩承裁能力，减小其沉降，在工程中已运用多年，但大量工程实践表明其对不同地层的适应性是不同的。根据某工程中钻孔灌注桩现场试验，对桩端压力灌浆技术在卵石层中灌注桩的运用效果其及经济、社会效益进行了分析。     

煤炭自燃早期预报的模糊聚类关联分析法

针对煤炭自燃危险程度的模糊聚类分析预报法存在的不确定性，提出用关联分析法对其进行补充、修正与完善。即用模糊聚类分析法分类后，用关联分析法求待预报样本与各类之间的关联度，根据相关程度预报，将两种方法组合成模糊聚类关联分析预报法。用该法对煤炭自燃早期预测预报，不仅克服了模糊聚类单一分析预报法的不足，使定性预报转为定量预报，而且提高了预报的准确程度，为有针对性的控制煤炭自燃提供了更科学的依据。