无脑儿心脏的组织学观察与比较

目的:探讨无脑儿与正常胎儿心脏结构的差异,为畸形胎儿的心脏发育研究提供形态学方面的资料。方法:用H.E染色,通过光镜观察无脑儿及正常胎儿的心脏结构。结果:无脑儿心脏的蒲肯野细胞数量明显低于同龄正常胎儿。结论:无脑儿神经系统发育异常影响其心脏内蒲肯野细胞的发育。     

试论唐前期人口重心北移及其影响

大量史实表明 ,由于唐前期政治、经济、文化诸因素影响 ,从全国范围来看 ,周边地区及南方人口日渐向北方黄河中下游地区集中 ,导致了唐前期全国人口分布重心北移的现象 ,并对唐代社会经济发展产生了深远的影响     

“向未来移民”的哲学——读安希孟《孤独的哲学》

《孤独的哲学》是一部阐发“向未来移民”的哲学的书。“向未来移民”，就是自觉地与旧的传统决裂，变革自己周围的社会，改造旧世界，建设新世界。改变传统、推陈出新、穿越时间的通道、以独立的精神、自由的思想“向未来移民”，这是我们最好的选择。     

COMPUTER SIMULATION FOR ELECTRICALLY DRIVEN MOTION OF FLUID

In this paper,an equation system of electrohydrodynamics(EHD)based onthe fluid motion equations is discussed.Emphasis is put on the effects of electrical forceand surface tension upon the fluid motion.The Marker and Cell method is used to set up acomputational simulation program of electrically driven motion of fluid.With the help ofthe program,a cylindrical fluid under the influences of electrical field and surface tensionhas been calculated.The result is in good agreement with the experimental observation.     

Review:DNA-damage response network at the crossroads of cell-cycle checkpoints, cellular senescence and apoptosis

Tissue homeostasis requires a carefully-orchestrated balance between cell proliferation, cellular senescence and cell death. Cells proliferate through a cell cycle that is tightly regulated by cyclin-dependent kinase activities. Cellular senescence is a safeguard program limiting the proliferative competence of cells in living organisms. Apoptosis eliminates unwanted cells by the coordinated activity of gene products that regulate and effect cell death. The intimate link between the cell cycle, cellular senes- cence, apoptosis regulation, cancer development and tumor responses to cancer treatment has become eminently apparent. Extensive research on tumor suppressor genes, oncogenes, the cell cycle and apoptosis regulatory genes has revealed how the DNA damage-sensing and -signaling pathways, referred to as the DNA-damage response network, are tied to cell proliferation, cell-cycle arrest, cellular senescence and apoptosis. DNA-damage responses are complex, involving “sensor” proteins that sense the damage, and transmit signals to “transducer” proteins, which, in turn, convey the signals to numerous “effector” proteins implicated in specific cellular pathways, including DNA repair mechanisms, cell-cycle checkpoints, cellular senescence and apoptosis. The Bcl-2 family of proteins stands among the most crucial regulators of apoptosis and performs vital functions in deciding whether a cell will live or die after cancer chemotherapy and irradiation. In addition, several studies have now revealed that members of the Bcl-2 family also interface with the cell cycle, DNA repair/recombination and cellular senescence, effects that are generally distinct from their function in apoptosis. In this review, we report progress in understanding the molecular networks that regulate cell-cycle checkpoints, cellular senescence and apoptosis after DNA damage, and discuss the influence of some Bcl-2 family members on cell-cycle checkpoint regulation.     

A novel cell search scheme for OFDM cellular systems

INTRODUCTION Owing to its inherent ability to combat the multi-path fading channel, the modulation technology of orthogonal frequency division multiplexing (OFDM) has been widely used in many high-rate data transmissions such as digital video broadcasting (DVB-T), wireless local area network (IEEE 802.11a) and broadband wireless access (IEEE 802.16e). Re-cently, it is accepted as the most promising candidate for E-UTRA downlink (3GPP TSG-RAN-1, 2006a), which is a super 3G cell…     

海南橡胶生态系统养份的生物地球化学特点

胶园土中有机质和N、P、K、Ca、Mg以及Cu、Zn、Mo、Cr等元素的丰度值比自然土低。由于橡胶生态系统结构单一,不断地收刈胶乳和清走残落物,使土壤养分收支不平衡,需施肥加以补充。     

移民实边与19世纪美国移民运动比较研究

19世纪美国的移民运动与20世纪初清政府在内蒙古地区推行的移民实边,起初两者的目标类似、措施雷同。但由于它们是在不同的历史环境中出现的,且又土地政策取向趋异,其移民运动就呈现出殊异的历史特点,构成了各自的开发模式。     

Say Goodbye…Let's Roll: The Social Dynamics of Wireless Networks on September 11

This article describes the use of wireless telecommunication media within the different locations directly affected by the hijackings on September 11. Comparisons across these different contexts provides an empirical anchor to more general themes concerning the social dynamics of wireless in the unfolding events of this day. An indication is given of how the important social role of wireless phones in this crisis could redefine public views on wireless media and thereby shape policy and regulation in the years ahead.     

‘Are Jews Who Fled Arab Lands to Israel Refugees,Too?’ (New York Times, 2003)

What part do newspapers play in helping us understand the experiences of migration and displacement? This paper will examine this question by exploring the representation of the displacement of some of the 800,000 Jews from ‘Arab lands’ in the period immediately after the emergence of the state of Israel and, more specifically, the experiences of Jews from Iraq in 1949–1951 and Egypt in 1956–1957, as reported in the New York Times, The (London) Times, and the Manchester Guardian. Despite the underlying and well-known threats to Jewish communities in these, and other, countries and their displacement from these lands, these newspapers rarely discussed these migrations as being ‘Jewish refugees’. Why this was so is one of the key questions that this paper seeks to ask.