思维美学的性质及其研究对象、任务和作用

本文探讨了新兴学科 《思维美学》的性质及其研究对象、任务和作用     

我国有色金属出口额的组合预测模型

有色金属产品是我国出口商品结构中的一个重要组成部分,在竞争激烈的国际市场上,中国有色金属产品的出口前景如何,需要我们用科学的方法加以预测。本文以一个典型产品(锑品)和一个典型市场(美国市场)为例,分别用二元线性回归模型和时间序列分析,对今后八年我国有色金属产品出口额进行了预测,并在这两种预测方法的基础上,推出了一种预测误差更小的组合预测模型。本文还对组合预测模型中权重的确定和预测误差的无偏性进行了证明。     

Finishing the euchromatic sequence of the human genome

The sequence of the human genome encodes the genetic instructions for human physiology, as well as rich information about human evolution. In 2001, the International Human Genome Sequencing Consortium reported a draft sequence of the euchromatic portion of the human genome. Since then, the international collaboration has worked to convert this draft into a genome sequence with high accuracy and nearly complete coverage. Here, we report the result of this finishing process. The current genome sequence (Build 35) contains 2.85 billion nucleotides interrupted by only 341 gaps. It covers approximately 99% of the euchromatic genome and is accurate to an error rate of approximately 1 event per 100,000 bases. Many of the remaining euchromatic gaps are associated with segmental duplications and will require focused work with new methods. The near-complete sequence, the first for a vertebrate, greatly improves the precision of biological analyses of the human genome including studies of gene number, birth and death. Notably, the human genome seems to encode only 20,000-25,000 protein-coding genes. The genome sequence reported here should serve as a firm foundation for biomedical research in the decades ahead.     

2004年科学基金国际（地区）合作与交流工作综述

本文回顾了2004年度国家自然科学基金委员会开展国际合作与交流的基本情况,以及拓展合作渠道、组织实质性合作项目等方面的进展,并简要阐述了近期工作思路和工作重点。     

A zebrafish homologue of the chemokine receptor Cxcr4 is a germ-cell guidance receptor

Germ cells preserve an individual's genetic information and transmit it to the next generation. Early in development germ cells are set aside and undergo a specialized developmental programme, a hallmark of which is the migration from their site of origin to the future gonad. In Drosophila, several factors have been identified that control germ-cell migration to their target tissues; however, the germ-cell chemoattractant or its receptor have remained unknown. Here we apply genetics and in vivo imaging to show that odysseus, a zebrafish homologue of the G-protein-coupled chemokine receptor Cxcr4, is required specifically in germ cells for their chemotaxis. odysseus mutant germ cells are able to activate the migratory programme, but fail to undergo directed migration towards their target tissue, resulting in randomly dispersed germ cells. SDF-1, the presumptive cognate ligand for Cxcr4, shows a similar loss-of-function phenotype and can recruit germ cells to ectopic sites in the embryo, thus identifying a vertebrate ligand-receptor pair guiding migratory germ cells at all stages of migration towards their target.     

The Cost effectiveness and Risk Analysis of Dynamic Conflict Decision Making

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佛山:中国渐进改革和高速发展的成功实例

佛山市贯彻渐进的经济改革和高速发展的经济增长的策略,将所有制的形式及其结构转变为多种经济成份共存的体制,达到“理想”的所有制结构;提出“贸、工、农”的策略,并加以贯彻执行,采取了面的向世界,外向型的工业化方针,成功地将其过半以上的劳力转移到主要以农村集体所有制为基础的乡镇企业中。佛山市政府在引导经济发展,协调宏观经济,组织区域性经济,参与投资和分配经济资源等方面起到了重要作用。     

回归与奉献——兼论俄狄浦斯王的心理受挫与渴望

因犯了杀父娶母大罪而被迫弄瞎双眼流放而死以解除百姓于灾难之中的俄狄浦斯王,一直作为一个罪人而承受了因果报应式惩罚。但是,随着现代心理学理论在文学批评理论领域的应用,人们才有可能从他受挫的心理出发去研究这一情节的必然性,并因此而对他的人品重新作出评价。在他的三次冒险中,始终贯穿着他强烈追求母爱的潜意识渴望,贯穿着他对人民的兴旺与幸福的无私奉献。因此,他暂时脱离母爱而流放致死只不过是一个楔子——把剧情推向高潮以更加充分地歌颂他的光辉和伟大。     

稻纵卷叶螟幼虫寄生性天敌的种群特征与多样性分析(英文)

水稻卷叶螟的田间种群包括三个种,即稻纵卷叶螟(Cnaphalocrocis medinalis),和 MarasmiaPatnalis,M.exigua。1989年雨季在菲律宾吕宋岛上两个点进行的试验共分别记录了15(内湖省)和12(中吕宋)个种的幼虫寄生性天敌,它们分别攻击寄主卵～幼虫、幼虫和幼虫～蛹期,这些寄生性天敌分属于外寄生或内寄生,单寄生或多寄生,这种生物学特征上的差异为寄生性天敌提供了降低寄主种群的广大的机会。进一步的调查显示,那些攻击低龄寄主的种类具有高繁殖力的小个体的特征,而攻击高龄寄主的种类具有较宽的寄主范围且常常发育历期较短。多数天敌寄生于2或3龄幼虫,将寄主杀死于5龄之前,优势种及寄生率随寄主密度和水稻的生长期不同而变化。 根据Hill(1972)的多样性序列指数分析指出,当以N_2为标准时,在内湖省的整个水稻生育期内始终仅有2—3个种为极优势种,其数据适于用几何或对数序列进行描述。两个点的寄生性天敌种群多样性(N_2)接近于常数3—4,均匀度(E_5)与寄主幼虫密度呈负相关。因此,幼虫的寄生作用可被认为是一个抑制并稳定水稻卷叶螟田间种群的关键因子。