Improved area-difference-based recovery information placement

<正> In mobile computing systems,message logging can be used to provide fault tolerance for mobilehosts.Due to the mobility of mobile hosts,their recovery information,including logged messages andcheckpoints,may spread throughout mobile support stations.During recovery,there will be a considerablecost for the collection of recovery information.To speed up recovery and to reduce the failure-freeoverhead,an improved area-difference-based scheme is proposed.It tries to keep recovery informationevenly spreading over an area.Only part of recovery information needs to be migrated for controlling thedistribution of recovery information.To reduce the migration cost,a light-weight migration is also proposed.In the performance study,we give an analysis of the probability that the light-weight migrationtakes place.     

企业并购中的融资风险及防范

在当代并购已成为经济全球化下企业超速成长的一种趋势,但从并购的特征和并购的具体事例来看,并购的整个过程又是一项高风险的资本经营活动。并购的每个流程都始终贯穿着资金的流动。分析我国企业并购中的融资风险,并根据我国的实际情况从融资规模、融资方式及融资结构等方面提出防范融资风险的具体措施。     

氨酯键和脲键对嵌段聚氨酯和嵌段聚脲性质影响的研究

用溶液聚合法合成了四种聚氨酯、聚脲模型化合物.并用凝胶渗透色谱,应力—应变,广角X射线衍射等手段检验了在相界面或在硬段微区,不同键对聚合物分子量、力学性质和聚合物形态的影响.     

Construction of a genetic map and localization of QTLs for yield traits in tomato by SSR markers

Using an F2 population derived from the hybrid of Lycopersicon esculentum Mill. ‘XF 98-7’× Lycopersicon pimpinellifolium LA2184, a SSR genetic linkage map of tomato is constructed. The map contains 112 markers and spans 808.4 cM with an average distance of 7.22 cM between loci. Two quantitative trait loci (QTLs) for first flower node on chromosomes 5 and 11, two QTLs for number of flowers per truss on chromosomes 2 and 5, and five QTLs for fruit weight on chromosomes 1, 2, 3, 9 and 12 are identified.     

Cloning, prokaryotic expression,purification and sequence analysis of 20S proteasome subunit gene from T.harzianum

The gene encoding the 20S proteasome subunit（PR29） was cloned from cDNA library of Trichoderma harzianum and expressed in Escherichia coli BL21 （D3） using a pET-28a expression system. The molecular weight of the protein was found to be approximately 29 kDa, as estimated by SDS-PAGE on gels. The target protein was insoluble when induced at 22℃ with 0.4 mmol/L IPTG, while dissoluble if induced at 37℃ with 0.8mmoL/L IPTG. The expressed product was purified through Ni-magnetic beads His Bind. The purity of the fusion protein reached above 80%. The entire eDNA sequence consisted of 1094 bp with 173 and 135 bp in 5＇ and 3＇ untranslated regions respectively. The gene encoding 261 amino acids has no signal peptide sequence. These results could provide a basis for validating the func-tions of PR29. It also provided a preliminary indication for further study of the mechanism and function of proteasome, and more information of proteasome mechanism in T.harzianum could be obtained.     

Development and Research on the Internet Resources Aggregation Platform

We proposed an Intemet resource aggregation platform based on semantic web. The platform includes an Web Ontology Language（OWL） ontology design toolkit（VO-Editor） and a selective inference algorithm engine so that it can visually editing ontology and using novel selective reasoning for information aggregation. We introduce the VO-Editor and the principle of selective inference algorithm. At last a case of budget travel system is used to interpret the approach of Internet resources aggregation by this platform.     

B值随机变量一类加权和的完全收敛性

设{Xni:1≤i≤n,n≥1}为行间独立的B值r.v.阵列,X为实值r.v.,E｜X｜p<∞,p>2,且对 x>0, 1≤i≤n,n≥1,都有P(‖Xni‖>x)≤P(｜X｜>x).{ani:1≤i≤n,n≥1}为满足条件∑ni=1a2ni=1,n≥1的实数阵列.则1n1 p∑ni=1aniXnip0蕴涵1n1 p∑ni=1aniXni完全收敛于0.     

THE INFLUENCE OF SO_3 IN C_2AF_(1-)-C_(11)A_7&CaF_2-C_2S SYSTEM ON FORMATION OF C_(11)A_7CaF_2

The paper reports investigation which have confirmed the relation between burningtemperature and formation of minerals,which exists in iron-rch fluornluminate cementIn order to burn iron-rich fluoraluminate cement at lower temperature,the SO_3 contentmust be controlled.     

Immune recognition of a human renal cancer antigen through post-translational protein splicing

Cytotoxic T lymphocytes (CTLs) detect and destroy cells displaying class I molecules of the major histocompatibility complex (MHC) that present oligopeptides derived from aberrant self or foreign proteins. Most class I peptide ligands are created from proteins that are degraded by proteasomes and transported, by the transporter associated with antigen processing, from the cytosol into the endoplasmic reticulum, where peptides bind MHC class I molecules and are conveyed to the cell surface. C2 CTLs, cloned from human CTLs infiltrating a renal cell carcinoma, kill cancer cells overexpressing fibroblast growth factor-5 (FGF-5). Here we show that C2 cells recognize human leukocyte antigen-A3 MHC class I molecules presenting a nine-residue FGF-5 peptide generated by protein splicing. This process, previously described strictly in plants and unicellular organisms, entails post-translational excision of a polypeptide segment followed by ligation of the newly liberated carboxy-terminal and amino-terminal residues. The occurrence of protein splicing in vertebrates has important implications for the complexity of the vertebrate proteome and for the immune recognition of self and foreign peptides.