Structure of podecdysone C,a steroid with moulting hormone activity from the bark ofPodocarpus elatus R. Br.

Résumé Le Podecdysone C, un stérol extrait de l'écorce de l'arbrePodocarpus elatus R. Br. et qui fonctionne comme hormone de mue est identique au THE-III (26-hydroxy--ecdysone, II) extrait du ver du tabacManduca sexta.     

Pharmacogenetics and disease genetics of complex diseases

Advances in technologies and the availability of a single nucleotide polymorphism (SNP) map are beginning to show the true potential for the human genome project to affect patient healthcare. A whole genome scan, the use of 100,000–300,000 SNPs across the genome, is now possible. Use of traditional approaches and the whole genome scan will result in identification of disease susceptibility genes and development of many new treatments in the longer term. In the shorter term, the goal will be to predict those patients at risk to experience an adverse reaction or those with a high probability for improved efficacy (i.e. pharmacogenetics). As progress is made in the area of disease genetics and pharmacogenetics, our understanding of disease susceptibility and its interrelationship with drug response will improve, making targeted therapy (i.e. the right drug to the right patient) a reality.Received 19 December 2002; received after revision 14 February 2003; accepted 20 February 2003     

利用网络环境培养特色信息技术人才的教学模式探讨

阐述了网络技术与信息处理专业课程的特点及其教学模式改革的必要性．通过对课程结构的调整、教学手段的创新以及教学资源的优化控制等手段，探讨了更符合信息技术专业特点的人才培养方式。     

卟啉化合物的电化学性质

合成2种在苯环对位连接性质不同取代基的卟啉单体和4种桥联基团性质各异的卟啉低聚物, 并利用循环伏安法研究上述卟啉单体和卟啉低聚物的电化学性质. 结果表明: 卟啉单体周边连接推电子取代基与连接吸电子取代基的卟啉单体相比电极电势正移; 比较卟啉低聚物电化学性质发现, 桥连基团的性质及整个卟啉分子的共轭程度对其电化学性质均有不同程度的影响.     

基于多元统计分析的葡萄酒质量评定体系的探究

本文的模型是探究用葡萄和葡萄酒的理化指标评定葡萄酒质量的统计问题.研究以多元统计分析为理论基础,综合聚类、方差分析、相关性分析、因子分析等方法,通过建立葡萄酒的理化指标和质量的关系模型,定量地描述了葡萄酒的理化指标和葡萄酒质量的关系,对研究用葡萄和葡萄酒的理化指标评定葡萄酒质量,提供了理论依据,为设计葡萄酒以及改善葡萄酒的质量有重要意义.     

从苦楝籽中提取多萜类化合物的研究

用多种溶剂浸渍苦楝籽作对比实验 ,结果表明 ,用 2 0 %的甲醇水溶液 ,在 6 0℃时浸渍提取多萜类化合物的收效较好 ,产率较高 .     

Cell-surface labelling reveals no evidence for membrane assembly and disassembly during fibroblast locomotion.

As a cultured fibroblast moves, particles or pieces of debris attached to its surface move backwards with respect to both the cell and the substrate1,2, as also do concanavalin A (Con A) receptors in the membrane of the leading lamella3. One suggested explanation is that membrane components from the cytoplasm are assembled and introduced into the surface membrane of the moving cell close to its leading edge and flow backwards to a 'sink'; there the membrane is disassembled, and its components enter the cytoplasm and flow forward within the cell, to be re-introduced later into the surface membrane1,4. However, because cell-surface receptors can be redistributed as a result of cross-linking by external ligands5,6 it has been proposed that the backward flow of Con A receptors and particles may result from such a cross-linking rather than from a flow of intact cell membrane7,8. To investigate these alternatives, I have studied moving fibroblasts by means of a cell membrane label that does not induce the redistribution of its receptors. My results do not seem compatible with the membrane flow model.     

Are plant toxins aimed at decomposers?

Summary Secondary plant substances may regulate the rate of decomposition. Evidence from many quarters suggests that this may be one of their primary ecological roles.     

Biological activity of synthetic moulting hormone analogues in the blowflyCalliphora stygia

Résumé L'activité biologique de la 2, 22, 25-trideoxy--ecdysone chezCalliphora est plus élevéc que celle de toutes les substances analogues examinées.