Life-history traits of voles in a fluctuating population respond to the immediate environment.

Life-history traits relating to growth and reproduction vary greatly among species and populations and among individuals within populations. In vole populations, body size and age at maturation may vary considerably among locations and among years within the same location. Individuals in increasing populations are typically larger and start reproduction earlier in the spring than those in declining populations. The cause of such life-history variation within populations has been subject of much discussion. Much of the controversy concerns whether the memory of past conditions, leading to delayed effects on life-history traits, resides in the environment (for example, predators, pathogens or food) or intrinsically within populations or individuals (age distribution, physiological state, genetic or maternal effects). Here we report from an extensive field transplant experiment in which voles were moved before the breeding season between sites that differed in average overwintering body mass. Transplanted voles did not retain the characteristics of their source population, and we demonstrate an over-riding role of the immediate environment in shaping life-history traits of small rodents.     

水稻光温敏雄性不育基因连锁标记的分离与鉴定

两系法杂交稻是一种利用水稻杂种优势的重要途径,主要依据水稻光温敏雄性不育系在不同条件下的育性转换用于配制杂交种．以培矮64S(PTGMS)与明恢63杂种自交的F2代为供试材料,采用随机放大多态性DNA(RAPD)技术分离与培矮64S的PTGMS基因连锁的分子标记．在F2代2个分别代表可育和不育的群体以及亲本株系中,采用100个RAPD引物扩放基因组DNA筛选多态性DNA片段．RAPD引物S8产生的DNA片段中,除重复顺序外,有一个长度为0．85kb片段为单拷贝．分子杂交表明,这一单拷贝标记与培矮64S的PTGMS基因连锁．     

对医院中层干部管理引入竞聘上岗机制的思考

随着医院干部人事制度改革的深化,引入中层干部竞聘上岗机制势在必行。在实际运作中,应本着"公开、公平、公正"的原则,结合医院实际情况,合理组织,规范操作,科学考核,客观分析竞聘过程中的问题,采取有效措施,不断完善竞聘机制。     

荧光猝灭法研究Fe(Ⅲ)和Zn(Ⅱ)与血清白蛋白的竞争结合

利用荧光猝灭法,在生理pH值7.43,20℃时,研究了Fe(Ⅲ)-血清白蛋白-Zn(Ⅱ)双金属体系中Fe(Ⅲ)、Zn(Ⅱ)与血清白蛋白相互作用,得出Fe(Ⅲ)与血清白蛋白结合比Zn(Ⅱ)与血清白蛋白结合强,并且在HSA体系中,Zn(Ⅱ)能够促进Fe(Ⅲ)与血清白蛋白的结合.     

带干扰的多险种离散风险模型的破产概率

研究了一类带干扰的多险种离散风险模型,两索赔额均为二项随机序列,两保单到达均为Poisson随机序列,应用鞅方法得出了最终破产概率的一般表达式,Lundberg不等式,以及有限时间内破产概率的一个上界估计.     

对维吾尔族农村女性命运的深刻展示——论当代维吾尔族女作家热孜万古丽·玉素甫的女性主义小说

维吾尔族女性文学的后起之秀热孜万古丽·玉素甫的小说无论在内容还是在形式上都极具女性主义文学的特质,从上述两方面论述该作家的女性主义文学文本。     

索赔到达受同一马氏链调制的双险种风险模型

研究了一类理赔到达受同一马氏跳过程调制的双险种风险模型, 得到了其条件破产概率及最终破产概率的积分方程.     

对绳拉船靠岸问题的再探讨

将拉船细绳模拟为刚体，用刚体平面运动的基点法得出了绳上任一点的速度及加速度表达式，对细绳的运动给出了全面而清楚的分析，并给出了细绳上各点速度及方向的一般分布规律。对结果作了分析和讨论。与其他分析方法相比，本分析方法更直观，清晰，简单。     

截桩纠偏与基础托换加固实例分析

以舟山市定海某住宅楼收偏加固为实例,阐述了错杆静压桩基础托换加固技术和截桩纠偏结合基底掏土纠偏技术对水泥搅拌桩复合地基基础沉降不均匀房屋的综合治理,在居民不搬迁的情况下,把住宅楼倾斜扶正、使住宅楼的基础得到加固,达到了加固基础和纠偏房屋的目的。该项目的成功实施对舟山地区以后的房屋纠偏加固具有现实的指导意义。     

扩展安全区求解孔系坐标尺寸链

在孔系坐标尺寸换算过程中,首选设定了孔心距综合公差带安全区,并按不同的边界条件对安全区进行扩展,最后导出坐标尺寸公差的计算公式。     

基于小波分析方法的一类函数的限制逼近

对一类性质较弱的函数f(x)，通过小波变换的方法判别其与α有关的函数特性，进一步给出其具有单调性的多项式序列逼近，及相应的逼近阶估计。     

高丰度硅-28同位素的分离技术

同位素纯硅片具有特殊的物理性质,在信息技术领域有着非常广阔的应用前景。为获得高丰度28Si,利用国产的高速气体离心机,选择SiF4作为分离的工作介质,对硅同位素进行了离心分离实验。通过单机分离实验,调整气体离心机的有关参数,摸索出适合级联分离的单机参数,同时得到气体离心机分离硅同位素的单位质量数的全分离系数γ0。利用由4台离心机组成的级联,经过6个阶段的分离,得到了28Si丰度达到99.5%的样品。实验结果表明,离心法分离硅同位素是完全可行的。     

考虑磁场影响时一类半导体方程的弱解存在性

本文研究考虑磁场影响时的半导体基本方程组,这是一个抛物-椭圆耦合组,并带有混合初边值条件.利用正则化方法和 Moser 技巧得到了该问题弱解的存在性结果,从而减弱了作者在文[2]中的条件.     

如何突破系统守护的大门

介绍了一些消除密码进入操作系统的方法,包括清除sam文件、增加用户、使用专用程序破解、物理移除等方法。     

Is resistance of a muscle to fatigue controlled by its motoneurones?

The original experiment of Buller et al. and the many subsequent confirmatory reports clearly show that the time-to-peak tension and many other speed-related parameters of slow and fast muscle fibres are dictated by the motoneurone. It has been concluded that the motoneurone exerts this control of the physiological and associated biochemical properties by the frequency at which it excites the muscle fibre. However, no studies have been reported on the fatigue properties and the associated biochemical characteristics after cross-reinnervation. Based on the 'size principle' of motoneurones, it would be reasonable to assume that a muscle fibre reinnervated by a small motoneurone would be active often and that this would be manifested biochemically as an elevated oxidative capacity. Also, it has been shown repeatedly that the mitochondrial content of a muscle fibre can be modified by daily endurance type exercise. Thus, it would seem that the motoneurone at least indirectly also controls the mitochondrial content of a muscle fibre by controlling the degree of activity. We have now tested this hypothesis using self- and cross-reinnervated muscles in cats. We found that fast- and slow-twitch muscles retained their characteristic fatigue resistance properties regardless of whether the nerve to which they had become connected had originally innervated a fatigue-resistant or relatively fatiguable muscle.     

论典型个案对法治社会建设的促进

典型个案在法治社会建设中具有独特作用。由于许多典型个案涉及普通民众的关切,极易对普通民众的法治观念产生较大影响。良好的典型个案促进民众对法治的信任,而不良的典型个案又往往会让民众对法治产生怀疑。必须深刻分析典型个案对法治社会影响的机理,确保每一个典型个案的质量,让人民群众在每个典型个案件中体会到公平正义,并通过对典型个案的宣传与推介等方式,向民众传播法治,实现全民守法,促进法治社会的建设和发展。