不定型高温耐磨衬里材料的制备及应用

不定型高温耐磨衬里材料主要是针对火电、冶金、化工等行业物料输送、通风、除尘等系统设备进行内衬保护和修复而设计的。该产品采用三元复合胶结料，以刚玉为骨、粉料，并引入一定的纤维材料和少量的超微粉料及其它添加剂，使产品在相当宽的温度范围内具有很高的抗折强度和耐压强度．热震稳定性和耐磨性能优异。     

基于分子重组技术的DNA计算

DNA计算是计算科学和分子生物学相结合的新领域。目前关于DNA计算的研究主要是抽象的计算模型和简单的原理性试验。DNA剪接计算模型是以生物DNA分子重组技术为基础的文法系统。本文主要介绍DNA剪接计算模型的文法结构及计算方法,证明了DNA剪接模型可以计算所有图灵机可计算函数。     

盐生杜氏藻cbr基因的克隆

首先对其他物种cbr／elip基因的同源序列进行相似性分析,设计一对简并引物,利用TR—PCR技术获得-250bp的片段,经克隆测序分析发现其同D．bardwail的cbr基因有67．0％的同源性,然后再以此片段为模板设计引物,通过RACE技术构建盐生杜氏藻cbr基因的全长序列．     

Therapeutic angiogenesis induced by human hepatocyte growth factor (HGF) gene in rat myocardial ischemia models

Coronary arteriosclerotic cardiopathy is also named myocardial ischemia, which severely threatens humanhealth. Following the economic development and change of life style in China, population blood pressure, weight index and serum cholesterol level all rise. This prophesies incidence rate of coronary arteriosclerotic cardiopathy and stroke will increase year by year. Angioplasty and surgical bypass, the primary interventional therapies for these in-dividuals, are temporally limited by the prob…     

染色体位置对酵母SUC2基因表达的影响

通过ＦＬＰ－ＦＲＴ位点特异性ＤＮＡ切离和ＤＮＡ定点整合技术,将酵母蔗糖酶基因整合到酿酒酵母染色体不同位置上,测定了ＳＵＣ２基因表达情况,从而对酵母染色体位置效应进行了初步研究。     

The search for the right partner: Homologous pairing and DNA strand exchange proteins in eukaryotes

Finding the right partner is a central problem in homologous recombination. Common to all models for general recombination is a homologous pairing and DNA strand exchange step. In prokaryotes this process has mainly been studied with the RecA protein ofEscherichia coli. Two approaches have been used to find homologous pairing and DNA strand exchange proteins in eukaryotes. A biochemical approach has resulted in numerous proteins from various organisms. Almost all of these proteins are biochemically fundamentally different from RecA. The in vivo role of these proteins is largely not understood. A molecular-genetical approach has identified structural homologs to theE. coli RecA protein in the yeastSaccharomyces cerevisiae and subsequently in other organisms including other fungi, mammals, birds, and plants. The biochemistry of the eukaryotic RecA homologs is largely unsolved. For the fungal RecA homologs (S. cerevisiae RAD51, RAD55, RAD57, DMC1; Schizosaccharomyces pombe rad51; Neurospora crassa mei3) a role in homologous recombination and recombinational repair is evident. Besides recombination, homologous pairing proteins might be involved in other cellular processes like chromosome pairing or gene inactivation.     

生命科学研究的若干重大突破

介绍了生命科学研究的若干最新重大突破,包括基因重组改造昆虫技术、干细胞治疗技术、克隆抗盐基因技术、生物芯片技术等。     

试论国有企业改革的途径

论述了我国国有企业改革的主要途径与成效,并对国企改革带来的问题进行了思考。     

Design of nonuniform cosine-modulated filter-banks with the perfect-reconstruction property and arbitrary filter lengths

In this paper, a method is proposed to construct recombination nonuniform cosine-modulated filter banks (CMFBs) with a perfect-reconstruction property and with arbitrary filter lengths. In this filter bank (FB) structure, certain channels of an original M-channel uniform FB are merged by a set of transmultiplexers (TMUXs), yielding nonuniform outputs, and the length restrictions on the original CMFB and the recombination TMUXs are avoided, allowing them to have arbitrary filter lengths. By imposing certain improved matching conditions on the prototype filters, nonuniform FBs with arbitrary filter lengths and with good properties can be obtained. As a result, the flexibility of selecting modulation types and filter lengths is greatly increased in the design of recombination nonuniform CMFBs. Another benefit due to the flexibility is that the system delay can be reduced.