大众体育思潮冲击下足球策略调整研究

通过问卷调查发现，现代青年对体育项目的喜爱中反映出的相对应的体育文化类型，首先是在休闲的生活方式的锻炼中有所追求展示技艺的体育项目，在此基础上分析足球运动项目不被现代青年所钟爱的原因为：社会发展的必然趋势；足球自身的特点限制了它的大众化传播；我国足球事业发展缺乏大众化策略．最后相应给出了一些对策．     

身体素质引导课存在的问题与改进办法

每学期初的两次体育课,称为身体素质引导课较为适当.目前,这类课型存在着“运动负荷安排不合理“、“练习顺序安排不适当“等问题;改进的方法是:分析问题存在的根本原因,提高教师素质,强化教学管理.     

采用WD倒谱法分析人体肾组织的超声散射微结构特征

提出了一种对超声散射信号分析的新方法———WD倒谱法 .利用该方法对人体正常肾和肾肿瘤组织的回波信号进行分析 ,与用AR倒谱法所得结果进行了比较 .结果表明 ,两种肾组织散射子的平均间距明显不同 ,WD倒谱比AR倒谱更能反映软组织的微观结构特征 ,说明WD倒谱是软组织超声散射信号分析与软组织散射子平均间距定征的一种有效方法     

The DNA sequence, annotation and analysis of human chromosome 3

After the completion of a draft human genome sequence, the International Human Genome Sequencing Consortium has proceeded to finish and annotate each of the 24 chromosomes comprising the human genome. Here we describe the sequencing and analysis of human chromosome 3, one of the largest human chromosomes. Chromosome 3 comprises just four contigs, one of which currently represents the longest unbroken stretch of finished DNA sequence known so far. The chromosome is remarkable in having the lowest rate of segmental duplication in the genome. It also includes a chemokine receptor gene cluster as well as numerous loci involved in multiple human cancers such as the gene encoding FHIT, which contains the most common constitutive fragile site in the genome, FRA3B. Using genomic sequence from chimpanzee and rhesus macaque, we were able to characterize the breakpoints defining a large pericentric inversion that occurred some time after the split of Homininae from Ponginae, and propose an evolutionary history of the inversion.     

杆系结构静/动力学计算的直接方法

针对有限单元法计算精度受网格密度制约的问题,提出一种求任意复杂杆系静、动力学问题精确解的方法.该方法基于节点分析法,逐个节点列位移相容方程和内力平衡方程,以谱系数作为未知数,杆件变形和截面内力则采用相应问题的精确解来描述.用代数符号化的方式,对方程系数矩阵的组建过程进行了详细描述,为通用程序编制提供依据.对建模过程中的分布式载荷和铰接接头的处理方法进行了探讨并给出处理方法.通过平面钢架屈曲分析和空间管路谐响应分析,证实所提方法具有计算精度高、划分单元数少的特点,特别适合于需要精确解的场合.     

Functions of poly(ADP-ribose) polymerase in controlling telomere length and chromosomal stability.

In most eukaryotes, poly(ADP-ribose) polymerase (PARP) recognizes DNA strand interruptions generated in vivo. DNA binding by PARP triggers primarily its own modification by the sequential addition of ADP-ribose units to form polymers; this modification, in turn, causes the release of PARP from DNA ends. Studies on the effects of the disruption of the gene encoding PARP (Adprt1, formerly Adprp) in mice have demonstrated roles for PARP in recovery from DNA damage and in suppressing recombination processes involving DNA ends. Telomeres are the natural termini of chromosomes and are, therefore, potential targets of PARP. Here, by the use of two different techniques, we show that mice lacking PARP display telomere shortening compared with wild-type mice. Telomere shortening is seen in different genetic backgrounds and in different tissues, both from embryos and adult mice. In vitro telomerase activity, however, is not altered in Adprt1-/- mouse fibroblasts. Furthermore, cytogenetic analysis of mouse embryonic fibroblasts reveals that lack of PARP is associated with severe chromosomal instability, characterized by increased frequencies of chromosome fusions and aneuploidy. The absence of PARP does not affect the presence of single-strand overhangs, naturally present at the ends of telomeres. This study therefore reveals an unanticipated role for PARP in telomere length regulation and provides insights into its functions in maintaining genomic integrity.     

Juvenile hormone catabolism inManduca sexta: Homologue selectivity of catabolism and identification of a diol-phosphate conjugate as a major end product

We studied time-dependent metabolism of (10R)-[³H] juvenile hormone (JH) III and (10R, 11S)-[³H]JH I injected intoManduca sexta larvae; the hormones are metabolized to polar metabolites, expecially the JH acid-diol, and an unknown. Products were analyzed using a reversed-phase liquid chromatography assay. (10R)-JH III is metabolized much more rapidly than (10R, 11S)-[³H]JH I, whether injected seperately or as a mixture of hormones. The unknown metabolites of JH I and JH III were identified as phosphate conjugates of JH I and JH III diol by tandem mass spectral analysis of isolated samples. The phosphate conjugate of JH I diol is the principle end product of JH I metabolism.     

关于现代足球与中国传统人生观的探讨

足球传入我国至今已经一百多年,同时它伴随着西方足球思想对我国的现代化足球进程的影响,冲击着我国五千多年的传统人生价值观念.而近年来,我国学者对足球的研究逐渐转向了文化层面的研究上,它将对我国足球发展风格的定位起着重要积极作用.