缬草及其繁殖技术

缬草（ＶａｌｅｒｉａｎａｏｆｆｉｃｉｎａｌｉｓＬ．）又名满坡香、地麝,是败酱科的一种多年生高大草本。高达８０ｃｍ以上,。根状茎浓香,粗短,呈头状,带状须根簇生。茎中空,有纵棱,被粗白毛。叶对生,羽状深裂,裂片２～９对,裂片披针形或条形,顶端渐窄,基部...     

天麻室内有性繁殖技术

天麻室内有性繁殖技术蔡义荣（安徽省金寨县双河职业高中２３７３８１）天麻（Ｇａｓｔ。ｄｉ４ｅｌａｔａＢｌｕｍｅ）属寄生性兰科植物,无根无绿叶,依靠分解吸收蜜环菌卜。。ｌｉａｎａｍｅｌｌｅａ（ＶａｈｌｅｘＦｒ）ＱｕｅｌＪ而生存。应用箭麻（即成熟的天麻块茎...     

红豆杉属幼苗繁殖技术的研究进展

红豆杉属（Ｔａｘｕｓ）是珍贵的药用植物,其紫极醇的大规模开发应用加剧了资源短缺。本文概述了红豆杉属植物的区域分布、生境和群落学研究结果,重点了幼苗培育途径及技术关键。种子繁殖的关键是破除休眠和苗期遮荫;扦插繁殖的关键是插条年龄及长度、药剂品种与处理时间、扦插基质与季节、圃地荫棚与保暖设施的优化配套;组培繁殖的难点是根系诱导和幼苗芽丛形成。现阶段豆杉属植物的规模化发展宜以扦插供苗为主、辅以种子育苗、     

云抗10号良种茶的离体快速繁殖

InvitroRapidPropagationofCamelliasinensiscv．unkang10LIFu－Yuan（BaoshanTeacher'sHigherTrainingCollege,BaoshanYunnan678000）LIFu－Guo（InstituteofAgriculturalScience,BaoshanYunnan678000）1植物名称云抗10号良种茶（Camelliasinensiscv.Yunkang10）。2材料类别云南省昌宁县茶科站于1979年7月从渤海（云南省茶科所）引入作区试茶株上取穗繁殖的第二代扦插苗，已在茶园种植5年，切取茎尖芽包。3培养条件基本培养基为MS和改良ER（增加8．3％NH。NO。，COCI。·6H。0全部去除，生根时大量元素减半）。（l）MS＋6…     

鸟类的合作繁殖

简要介绍了鸟类合作繁殖的概念,列举了４种合作繁殖的典型事例,并从进化生态学理论上说明了合作繁殖的优点,成因及机制。     

红腹锦鸡繁殖生态研究

１９９３至１９９４年在贵州省绥阳县宽阔水林区进行的红腹锦鸡繁殖生态研究。野外考究中共发现１１个巢。观测得知;红腹锦鸡发情初期是３月底４月初;高峰期在４月１０左右,持续３－５ｄ;雄鸟求偶炫耀为侧面型;发情期中求偶频次最高在１４：００－１９：３０,巢主要筑于落叶,常绿阔叶林混交林中,占总数的５３．６％;雌鸟产卵期是１５ｄ,且大多是隔天产一卵;满窝卵数约５－７枚;孵化期为２３－１ｄ;雏鸟开始凿壳是近钝端     

楤木繁殖技术研究

对楤木繁殖技术进行了研究。楤木种子繁殖和扦插繁殖都用富含阔叶树腐叶的山基土作基质．播种在3月上旬进行可获70%左右的发芽率．扦插在2月上旬采用1年生枝条和2年生壮根作插穗成活率分别可达68％、76％左右。     

桃儿无繁殖生物学研究

以居群为单位研究了桃儿七的繁殖生物学,指出桃儿七为适应分布区内生长季节短暂的环境条件,花各部分的形态在开花前一年就已开始分化,并形成一休眠芽,但大小孢子还尚未进行减数分裂。到了第二年春天气温回升之后,大小孢子方才进行减数分裂,并在减数分裂之后,植株通过茎基部的居间生长将花及叶带出地面。桃儿七在开花时先花后叶。花在露出土面的第二、三天随即开放。虽然桃儿七具有一系列适应于虫煤传粉的形态结构和生物学特征     

小毛足鼠繁殖生态研究

１９９１￣１９９５年每年４￣１０月的各月中旬,在内蒙古伊克昭盟达拉特旗沙地草场上,不同生态环境中共布放１０１８４５个夹日,捕获鼠６３２５只,其中小毛足鼠（Ｐｈｏｄｏｐｕｓ ｒｏｂｏｒｏｖｓｋｉｉ）２２１７只,占３５．０５％。根据胴体重划分成４个年龄组,５年总的性比为４９．６１％,接近１：１,无季节差异。雄性繁殖期为９个月（２￣１０月）,有年间差异。雌性繁殖力随着年龄的增长而增高,亚成年组、成年Ⅰ组     

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.