信阳龟山地区变余糜棱岩的矿物学特征与热-构造演化史

通过对河南信阳龟山地区变余糜棱岩中不同产状的石榴石、黑云母及白云母等矿物的矿物学特征及其反映的变质作用温压条件研究，建立了区内变余糜棱岩热－构造演化的三阶段模式：（１）原岩的深部加热和抬升；（２）中深部走滑剪切和逆冲推覆；（３）浅表层脆性断裂和火山岩浆活动。     

3×3矩阵谱问题的约化及约化方程

对称群方法对可用ＩＳＴ方法求解的可积系统的完全分类是一种很有效的方法。规范等价系统的解、守恒律等以一种明显的方式联系着，而我们已证明了约化群在规范变换下是不变的，因此对可积系统进行规范分类就非常重要。在本文中，用对称群方法研究了３×３矩阵谱问题的约化枚举及分类，并得到了一些新的约化方程族。     

Sex determining mechanisms: An evolutionary perspective

Summary Theories on the evolution of sex determining mechanisms are reviewed for male and female heterogamety, environmental sex determination, and briefly, haplo-diploidy and hermaphroditism. Because of their discrete and well-defined nature, sex determining mechanisms lend themselves to three types of evolutionary questions:what variety occurs and might be expected but does not occur,how do changes occur from one mechanism to another, andwhy do certain changes occur? All three approaches were illustrated for these different sex determining mechanisms. A generality emerging from these studies is that, at the level of selection on the sex ratio, there are no intrinsic problems in evolving from one sex determining mechanism to another: straightforward transitions between different mechanisms exist under various conditions.     

基于微分进化免疫的RBF网络学习算法研究

该文提出一种微分进化算法与免疫算法相结合的方法,将该方法用于优化RBF网络隐节点参数,以改进RBF网络的性能,仿真结果表明收敛速度较快,训练精度较高,有效地改进网络的泛化能力.     

生物进化论的由来和发展

本文讨论了生物进化论的发生及其随着细胞遗传学、群体遗传学和分子遗传学相继兴起而在细胞水平、群体的基因水平及分子水平上得到迅速发展的历程。并提及在分子水平上出现的“中性突变漂变学说”和化石真正应用于进化研究后提出的“间断平衡学说”对达尔文式进化所构成的挑战。     

Implications of toxins in the ecology and evolution of plant pathogenic microorganisms: Bacteria

This review attempts to rationalise what is known about bacterial phytotoxins and associate it with the ecology and possible evolution of the producing organisms. Study of non-toxin producing variants gives insight into the ecological role of the toxin. Elucidation of chemical structures of phytotoxins has shown that many exist as families of analogous compounds. Studies on the variation of chemical structures and how they are distributed across species and genera can lead to development of hypotheses on evolutionary relationships. Knowledge on biosynthetic pathways to tosins allows recognition of specific enzymatic steps involved in developing the characteristic features of the structures. Phytotoxins often have a potent biochemical activity, and in some cases the producing organism has associated mechanisms to prevent action of the toxin upon itself; in such cases toxigenesis is clearly not a chance event. The various aspects of bacterial toxigenesis indicate that bacterial phytotoxins are special secondary metabolic products that play beneficial roles to the producing organisms in their various ecological niches.     

植物病毒、类病毒分子进化研究的现状和展望

对植物病毒、类病毒的分子进化进行了综述，通过分析和比较其全碱基序列，探讨了病毒、类病毒内部的亲缘关系和进化关系。     

社会变革与服装设计

服装是一种社会化商品,社会变革影响人们的服装选择,而流行服装又反映了社会的发展。本文就经济发展,家庭结构变化和生活多样化三才面分析了社会发展带来的生活观念的变化,深入探讨了由此产生的对服装需求的转变,认为在九十年代,服装设计人员只有深入理解与认识这些变化,提高知识修养,才能达成与消费者的心理沟通,进而设计出满足消费者需求的产品。     

无尾两栖类宿主与多盘科吸虫关系的初步探讨

文章调查研究了云南14种无尾两栖类体内寄生多盘吸虫的自然感染情况。滇中、滇东地区滇蛙和昭觉林蛙、滇南杜氏泛树蛙为多盘吸虫宿主。分析影响多盘吸虫宿主分布的原因可能有:地质构造、无尾两栖类宿主对多盘吸虫的免疫力和多盘吸虫侵入宿主产生的致病力对抗的不同。两栖类宿主和多盘吸虫的协同进化,导致同一种无尾两栖类宿主体内寄生的多盘吸虫有交叉感染情况存在。