贡嘎山等国家级自然保护区简介

自然保护区是国家为保护自然环境和自然资源,对具有代表性的不同自然地带的环境和生态系统,珍贵稀有动物自然栖息地及其他自然历史遗迹和重要水源地等划出界限加以特殊保护的自然地域。国际上常以自然保护区面积占国土的百分比衡量一个国家自然资源保护事业的发展水平。...     

空间分布型的形成过程研究

具合影个研究了广义空间分布型和复合空间分布型的形成问题,解释了空间分布型的形成机理,并给出了１１种广义空间分布型和９种复事空间分布型;同时提出了空间分布型的３种判定方法：扩散系数法、空间相关法和参数变动法,它们以可用于区分常见的空间分布型,也可以用于判定分布型的形成过程;为研究空间分布型的形成机理和变化规模提供了有力的手段。以马尾松毛虫的空间分布型的研究结果表明,马尾松毛虫幼虫的空间分布型是复合负     

奇怪的血型——孟买型与类孟买型

主要介绍孟买型与类孟买型血型的发现,家谱分析和产生原因。孟买型与类孟买型是ABO变异体中发现的一种罕见血型,该类血型由于基因突变导致不能产生H物质,即使有A基因或B基因也不能产生A抗原或B抗原,在临床上常常被误认为。型血。     

云南中新世杉科化石木研究

利用光学显微镜和扫描电镜首次对云南省楚雄州晚中新世石灰坝组石鼓村层的钙化木材进行了解决学研究。鉴定出两种类型的木材。柳杉型落羽杉型木（Taxodioxylon cryptomeripsoides Schonfeld)和杉木型落羽杉型木（Taxo-dioxylon cunninghamioides Watari)。二者分别与现代柳杉属和杉木属具有最接近的亲缘关系。根据这两种杉科化石木现存最近亲缘种的生态环境,并综合其他资料,推测该地区在晚中新世为温暖湿润的亚热带气候环境。     

福建武夷山的锈菌

福建武夷山锈菌区系基本上属于温带性质,温带型的种占60％以上,也有不少亚热带和热带型的种,本地区是温带和热带锈菌的交汇处。区系成分以东亚成分占显著地位,约占总种数的38.7％;中国特有种有14种,占9.3％;世界广布种占14％;尚有广布整个北半球的泛北极种类,分布欧亚大陆的种类以及亚洲和美洲间断分布的种类。本地区锈菌在种属组成上与日本和我国台湾省相近,已知种中分别有74％和60％以上与日本和我国台湾的种相同,说明它们同属一个区系。寄生在蕨类上被称作“活化石”的原始类型如拟夏孢锈(Uredinopsis)和明痂锈(Hyalopsora)在武夷山各采到了若干种,据此推测第四纪冰期武夷山地区可能也是古老生物的天然避难所之一。     

河南产业集聚区发展的若干问题

加快产业集聚区建设,是河南中原经济区快速发展的需要。产业集聚区具有自身的特点,必须在发展解决产业问题和集聚问题,解决外生型企业与内生型企业的关系,促进中原崛起。     

贻贝核型及染色体带型分析

本文对贻贝染色体进行了核型分析,其结果为：２ｎ＝２８,１２ｍ＋１０ｓｍ＋６ｓｔ,ＮＦ＝５０,ＴＣＬ＝１０３．９０μｍ,ＣＬ：２．７３５－４．７７４μｍ。第１、２、４、８、１１、１２对为中部着丝粒染色体（ｓｍ）,第３、５、７对亚端部着丝粒染色体（ｓｍ）。对贻贝染色体的Ｇ带,Ｃ带、银染色带进行了分析。银染结果表明,贻贝细胞中有四个银染核仁组织区,分布在第３、５对染色体长臂末端。     

假结核耶氏菌在实验条件下细菌L型的观察

细菌L型广泛分布在生物体内外,并为细菌生命周期的一相。本文应用假结核耶氏菌(Yersinia pseudotuberculosis)作为研究材料,在L型培养基中无抗生素存在情况下连续传代,观察到:正常型(杆状)假结核菌出现圆球体、丝状体,继续传代又返祖为正常型。实验表明,细菌L型是细菌生命周期中的一相。     

STUDY ON THE SPATIAL DISTRIBUTION PATTERN FORMATION

从理论上研究了广义空间分布型和复合空间分布型的形成问题,解释了空间分布型的形成机理,并给出了11种广义空间分布型和9种复合空间分布型;同时提出了空间分布型的3种判定方法扩散系数法、空间相关法和参数变动法,它们可以用于区分常见的空间分布型,也可以用于判定分布型的形成过程;为研究空间分布型的形成机理和变化规律提供了有力的手段。对马尾松毛虫的空间分布型的研究结果表明,马尾松毛虫幼虫的空间分布型是复合负二项分布,个体群内是随机分布的,个体群内的个体是相互吸引的,个体群内个体的密度是Gamma分布。     

Recent advances in the study of Kaposi's sarcoma-associated herpesvirus replication and pathogenesis

It has now been over twenty years since a novel herpesviral genome was identified in Kaposi's sarcoma biopsies. Since then, the cumulative research effort by molecular biologists, virologists, clinicians, and epidemiologists alike has led to the extensive characterization of this tumor virus, Kaposi's sarcoma-associated herpesvirus(KSHV; also known as human herpesvirus 8(HHV-8)), and its associated diseases. Here we review the current knowledge of KSHV biology and pathogenesis, with a particular emphasis on new and exciting advances in the field of epigenetics. We also discuss the development and practicality of various cell culture and animal model systems to study KSHV replication and pathogenesis.     

The structure, reproduction and taxonomy of Vidalia and Osmundaria (Rhodophyta, Rhodomelaceae)

Comprises species occurring mostly in subtidal habitats in tropical, subtropical and warm-temperate areas of the world. An analysis of the type species, V. spiralis (Sonder) Lamouroux ex J. Agardh, a species from Australia, establishes basic characters for distinguishing species in the genus. These characters are (1) branching patterns of thalli, (2) flat blades that may be spiralled on their axis, (3) width of the blade, (4) primary or secondary derivation of sterile and fertile branchlets and (5) position of sterile and fertile branchlets on the thalli. Application of the latter two characters provides an important basic method for separation of species into three major groups. Osmundaria , a genus known only in southern Australia, was studied in relation to Vidalia , and its separation from the Vidalia assemblage is not accepted. Species of Vidalia therefore are transferred to the older genus name, Osmundaria. Two new species, Osmundaria papenfussii and Osmundaria oliveae are described from Natal. Confusion in the usage of the epithet, Vidalia fimbriala Brown ex Turner has been clarified, and Vidalia gregaria Falkenberg, described as an epiphyte on Osmundaria pro/ifera Lamouroux, is revealed to be young branches of the host, Osmundaria prolifera.     

New or rare chromosome counts in Artemisia L. (Asteraceae, Anthemideae) and related genera from Kazakhstan

Fifteen chromosome counts of six Artemisia taxa and one species of each of the genera Brachanthemum, Hippolytia, Kaschgaria, Lepidolopsis and Turaniphytum are reported from Kazakhstan. Three of them are new reports, two are not consistent with previous counts and the remainder are confirmations of very scarce (one to four) earlier records. All the populations studied have the same basic chromosome number, x = 9, with ploidy levels ranging from 2x to 6x. Some correlations between ploidy level, morphological characters and distribution are noted.     

肝癌中HBV和HCV基因和抗原的分布及意义

采用原位分子杂交方法检测HCV RNA及HBV X基因;采用免疫组织化学方法研究HCV核心抗原,非结构区C33c抗原及HBxAg在肝细胞肝癌中的定位及分布.结果表明(1)HCV RNA、HBV X基因在肝细胞肝癌组织检出率分别为40%(55/136)和82%(112/136).HCV RNA定位于癌细胞的胞浆内,阳性细胞呈散在、灶状及弥漫分布三种形式;HBV X基因在肝癌细胞中的分布呈胞浆型、核型及核浆型,阳性细胞也呈上述三种分布形式;(2)HCV C33c抗原、核心抗原在肝细胞肝癌中的阳性率为81%(133/164)及86%(141/164).C33c抗原定位于癌细胞及肝细胞的胞浆内;核心抗原既定位于癌细胞核中,又可定位于胞浆中.C33c抗原阳性细胞以灶状分布为主;而核心抗原阳性细     

Selection with two alleles and complete dominance

For a plant selection model with frequency-independent viabilities, fertilities and selfing rates, it is shown that apart from global fixation, for certain parameter combinations a protected polymorphism and facultative fixation (either allele may become fixed according to initial frequencies) may both occur. Facultative fixation requires different selling rates for the dominant and recessive type. Protection of the polymorphism requires resource allocation for male and female function. In this connection the problem of purely genetically caused population extinction is discussed.
For general frequency dependence and regular segregation, the chances for establishment of a completely recessive gene are compared to those of a completely dominant gene. It is proven that the process of establishment of the recessive gene, despite a fitness advantage, may be considerably endangered by drift effects if random mating prevails. The recessive gene may reach the same effectivity in establishment as a dominant gene, only if the recessive homozygote mates exclusively with its own type during the period of establishment.