种间关系对中条山油松人工林天然更新及群落稳定性的影响

[目的]为了揭示种间关系对中条山油松人工林天然更新及群落稳定性的影响,为油松人工林经营管理提供理论依据.[方法]基于中条山油松人工林群落样地调查数据,分析油松人工林下主要植物的种间关联性、生态位重叠及群落稳定性,并在此基础上探讨种间关联和生态位理论在油松人工林天然更新障碍及群落稳定性形成机制中的作用.[结果]中条山油松...     

Uterine adenomyosis in an orang-utan (Pongo abelii/pygmaeus)

A 48-year-old, multiparous, female hybrid orang-utan ( Pongo abelii/pygmaeus ) was investigated after a 3-year history of irregular and excessively heavy menstrual bleeding. Opportunistic pelvic examinations over a 2.5-year period were non-diagnostic. Medical therapy was not effective. A subtotal hysterectomy with bilateral salpingo-ovariectomy was performed. A pedunculated mass spanning 90% of the uterine lumen was seen grossly, and histopathology confirmed uterine adenomyosis. Adenomyosis is defined as the ectopic occurrence or diffuse implantation of endometrial tissue, including glands and stroma, into the myometrium. It is common in older, usually premenopausal, multiparous women and is frequently associated with other uterine pathology, including endometrial hyperplasia and leiomyomas. The most common clinical signs are dysmenorrhoea and heavy menstrual bleeding; however, up to 35% of women are asymptomatic. Diagnosis is difficult and requires myometrial sampling and an experienced pathologist. A hysterectomy in this case was diagnostic and curative. There have been few reports of uterine adenomyosis in non-human primates and none reported in an orang-utan. Uterine adenomyosis should be considered in the differential diagnosis in any multiparous, aged, non-human female primate with irregular and excessively heavy menstrual bleeding, and hysterectomy with bilateral salpingo-ovariectomy is recommended as a diagnostic and therapeutic solution.     

3种阔叶树育苗技术及苗木生长规律研究初探

通过对闽楠，蓝果树，东京野茉莉的育苗试验，研究苗木生长规律，掌握生理生物学特性。     

Transient gene expression in transformed banana (Musa cv. Bluggoe) protoplasts and embryogenic cell suspensions

Summary In order to introduce currently-available genes with agronomical value into banana, two genetic transformation protocols have been optimized.Firstly, regenerable protoplasts isolated from embryogenic cell suspensions of the cultivar Bluggoe have been used for the introduction of several chimaeric uidA gene constructs by electroporation. With the inclusion of polyethylene glycol and heat shock, the frequency of transiently expressing protoplasts reached 1.8% as shown by an in situ -glucuronidase assay. A duplicated 35S promoter with an alfalfa mosaic virus leader sequence (pBI-426) induced the highest expression rate among the constructs tested.Embryogenic cell suspensions of cv. Bluggoe have also been bombarded with accelerated particles coated with a high expression uidA gene construct (pEmuGN) using a biolistic gun. After a partial optimization of the procedure, transient GUS assays reproducibly demonstrated the presence of 400 blue foci in 30 l of settled cell volume (approximately 25 mg cells). Selection and characterization of antibiotic-resistant transformed cultures is in progress.Abbreviations AMV alfalfa mosaic virus - GUS -glucuronidase - TGE transient GUS expression - uidA gene for -glucuronidase     

韭菜花芽分化过程及解剖学特征研究

为明确韭菜花芽的分化过程及内部结构特征,掌握不同类型韭菜的生殖生长周期,选用深休眠韭菜品种‘平韭2号’、浅休眠韭菜品种‘四季青’和‘薹韭’的三年生植株为试验材料,采用石蜡切片技术,观察韭菜茎尖生长点的变化。结果表明：可将韭菜花芽的分化过程分为4个时期——花芽未分化期、总苞和花序原基分化期、小花原基分化期与花部原基分化期。在统一的栽培条件下,韭菜品种不同,启动花芽分化的日期也不同。浅休眠品种‘四季青’比深休眠品种‘平韭2号’早约28 d,而同为浅休眠类型的‘薹韭’则比‘平韭2号’早约62 d。另外,花芽分化过程中各时期的持续时间在不同品种之间也表现出一定差异。     

21世纪上饶封山育林工程

从封山育林的理论基础和实践创新出发,阐述了上饶市林业建设的战略目标和经营措施.     

Infection dynamics of the monogenean parasite Gyrodactylus gasterostei on sympatric and allopatric populations of the three-spined stickleback Gasterosteus aculeatus

Parasites with high host specificity maximally depend on their hosts, which should increase the likelihood of coevolution. However, coevolution requires reciprocal selection exerted by the host and the parasite, and thus a considerable level of parasite virulence. In species of the monogenean ectoparasite genus Gyrodactylus consecutive generations are confronted with a single host, which may constrain the evolution of virulence. Transmission, which is often important in the ecology of Gyrodactylus species, may have the opposite effect, but may also lead to the avoidance of coevolutionary arms races. We investigated the potential outcome of coevolution between Gyrodactylus gasterostei Gl?ser, 1974 and its host, the three-spined stickleback (Gasterosteus aculeatus L.) by determining the strength of genotype by genotype (GxG) interactions on two levels: within and between sympatric and allopatric host populations. To do so, we compared the parasite's infection dynamics on laboratory-reared sympatric (Belgian) and allopatric (German) hosts. We found that a parasite line successfully infected a range of sympatric host genotypes (represented by families), while it failed to establish on allopatric hosts. Phylogeographic studies suggest that neutral genetic divergence between the host populations cannot explain this dramatic difference. Provided that this result can be generalised towards other parasite lines, we conclude that coevolution in this host-parasite system is more likely to lead to local adaptation on the population level than to GxG interactions within populations.     

改进PSO算法在电力系统无功优化中的应用

介绍一种改进粒子群的无功优化方法。采用简化粒子群优化方程和添加极值扰动算子两种策略加以改进,提出简化粒子群优化（SPSO）算法、带极值扰动粒子群优化（DPSO）算法,并将二者结合起来提出带极值扰动的简化粒子群优化（DSPSO）算法。以IEEE6节点系统为例进行无功优化计算,并与其他算法进行比较,结果表明：该算法具有较快的收敛速度及较强的全局搜索能力,可较好地解决电力系统的无功优化问题。     

积极采取措施加快江西林业三剩物和次小薪材综合利用的步伐

林业三剩物和次小薪材的综合利用,可以减少森林资源的采伐总量,提高其综合利用率,增加林木生产者和综合利用者的收入,还可带动山区经济的发展。应在计划管理、产业结构调整、林业规费减免、税收优惠政策落实等方面采取相应的鼓励措施,以加快综合利用的步伐,从而更好地发挥林业的生态、社会和经济效益。