凸模糊合作对策的模糊核仁

为了弥补在简单对策中核心具有常常为空的缺陷,研究模糊合作对策的模糊核仁解.核仁是合作对策的一种重要的解的形式.通过把合作对策核仁解的模型延拓到模糊对策中,并通过定义模糊合作对策的字典序,给出了模糊合作对策的模糊核仁的概念;然后进一步探讨了凸模糊合作对策的模糊核仁非空且唯一等特征和性质,并对此加以证明.研究表明:模糊合作对策的核仁是合作对策核仁的自然延拓.该结果丰富了对模糊合作对策的解的研究,从而解决了凸模糊合作对策的解的结构问题.     

Three-dimensional architecture of a polytene nucleus

The three-dimensional chromosome topography in an intact nucleus has been determined using fluorescently stained Drosophila polytene chromosomes, optical fluorescence microscopy and newly developed, generally applicable, cellular image reconstruction techniques. The folding pattern is a complex mixture of parallel chromosomal segments and intertwined coils and shows extensive interaction of the chromosomes with the nuclear envelope.     

硅基片上模式复用技术进展

模式复用作为光通信的一个复用维度,最近成为国际上的研究热点。本文综述了最近应用于硅基片上模式复用的相关进展,并介绍了一些核心器件及其性能,如：总线波导、复用/解复用器、光纤接口以及多模光开关等。本文从这些器件的工作原理,分析比较了他们的性能特点和优缺点,并展望了硅基片上模式复用的发展趋势。     

苏铁（Cycas revoluta）种子核仁中氨基酸成分分析

对苏铁种子核仁中氨基酸成分进行分析,苏铁种子中含有17种氨基酸,其中总氨基酸（TAA）和必需氨基酸（EAA）含量分别为8．16S2．91．其两种氨基酸的比例与标准蛋白质存在一定的差距,但是苏铁种子药用氨基酸和鲜味氨基酸的含量分别为68g和27．7老,对苏铁种子的开发利用具有重要意义．     

几类图的伴随多项式的整除性特征

用Ｐｎ和Ｃｎ依次表示有ｎ个顶点的路和圈．Ｄｎ表示Ｋ３的一个顶点与Ｐｎ－２的一个１度点重迭后得到的图．Ｔ（ｌ，ｍ，ｎ）表示度序列是（１，１，１，２，２，……，２，３）的树，其中ｌ，ｍ，ｎ分别是从它的唯一３度点到３个１度点的３条路的长．图Ｇ的伴随多项式记为ｈ（Ｇ，ｘ），本文证明了当Ｇ＝Ｐｎ，Ｃｎ，Ｄｎ，Ｔ（１，１，ｎ），Ｔ（１，２，ｎ），Ｔ（１，３，ｎ），Ｔ（１，４，ｎ）时，ｈ（Ｇ，ｘ）能被ｈ（Ｐｍ，ｘ）（ｍ≥２）整除的充要条件．     

Configuration of nucleolar DNAin situ in nucleolus ofAllium cepa cells

The location and configuration of nucleolar DNA have not been determined for a long time. In this paper, we have observed the nucleolar ultrastructure and the character of nucleolar DNA in Allium cepa cells by conventional electron microscopy and the cytochemical NAMA-Ur DNA specific staining method. Furthermore, we have properly improved the NAMA-Ur method so as to analyze the location and configuration of nucleolar DNA in situ. Our results indicated that the nucleolar DNA in Allium cepa cells is mainly located at the border between fibrillar centers and dense fibrillar component, especially distributed in the configuration of encircling the fibrillar centers.     

Deficient pheromone responses in mice lacking a cluster of vomeronasal receptor genes

The mammalian vomeronasal organ (VNO), a part of the olfactory system, detects pheromones--chemical signals that modulate social and reproductive behaviours. But the molecular receptors in the VNO that detect these chemosensory stimuli remain undefined. Candidate pheromone receptors are encoded by two distinct and complex superfamilies of genes, V1r and V2r (refs 3 and 4), which code for receptors with seven transmembrane domains. These genes are selectively expressed in sensory neurons of the VNO. However, there is at present no functional evidence for a role of these genes in pheromone responses. Here, using chromosome engineering technology, we delete in the germ line of mice an approximately 600-kilobase genomic region that contains a cluster of 16 intact V1r genes. These genes comprise two of the 12 described V1r gene families, and represent approximately 12% of the V1r repertoire. The mutant mice display deficits in a subset of VNO-dependent behaviours: the expression of male sexual behaviour and maternal aggression is substantially altered. Electrophysiologically, the epithelium of the VNO of such mice does not respond detectably to specific pheromonal ligands. The behavioural impairment and chemosensory deficit support a role of V1r receptors as pheromone receptors.     

除环上的无穷向量与无限方阵

研究除环上无穷向量的线性关系，利用除环上无限方阵乘法的左（右）消去律给出了除环上的无限方阵可逆的新充分必要条件。