贯叶马兜铃的组织培养与快速繁殖

1植物名称贯叶马兜铃（Aristolochia delavayiFranch）。2材料类别腋芽。3培养条件基本培养基为MS。启动培养基：（1）MS＋NAA 1 mg·L-（-1）（单位下同）＋6-BA 0.5;增殖培养基：（2）MS＋NAA 0.5＋6-BA 2;生根培养基：（3）1/2MS＋IBA 0.5。以上培养基中均加入30 g·L-（-1）蔗糖、7 g·L-（-1）琼脂,pH 5.8。培养温度（25±3）℃,光照时间12 h·d-（-1）,光照强度40～50μmol·m-（-2）·s-（-1）。     

花叶万年青的组织培养和快速繁殖

研究了观赏植物花叶万年青属9个品种的组织培养和快速繁殖技术。不同品种的组织培养能力有很大差异．培养基中添加3－5mgL-16-BA比较适宜花叶万年青不定芽的诱导培养和增殖培养,生根培养基以1／2MS＋0．5mgL-1NAA效果较好。实现了玛利安万年青等4个品种的组培快繁工厂化生产。     

风箱果腋芽组织培养

1植物名称风箱果[Physocarpusamurensis(Maxim.)Maxim.]。2材料类别休眠期腋芽。3培养条件(1)诱导培养基:WPM+TDZ0.01mg·L-1(单位下同)+IBA1.0;(2)增殖培养基:MS+6-BA1.1+NAA1.0;(3)壮苗培养基:MS+6-BA0.6+NAA2.0;(4)生根培养基:MS+IBA0.1。以上培养基均添加0.65%琼脂和2.5%蔗糖,在高温灭菌前pH值调至5.8。培养温度为25℃,光照时间16h·d-1,光强为30￣40μmol·m-2·s-1。4生长与分化情况4.1无菌材料的获得风箱果的枝条采自黑龙江省尚志市东北林业大学帽儿山实验林场境内。在室内水培3周后,取饱满的腋芽作外植体。腋芽用70%…     

沉水植物菹草的组织培养和快速繁殖

1植物名称菹草(PotamogetoncrispusL.)。2材料类别带节间的茎段。3培养条件(1)诱导腋芽萌动及不定芽分化的培养基:MS+6-BA1.0￣3.0mg·L-1(单位下同)+IBA0.5;(2)继代增殖培养基:MS+6-BA1.0;(3)生根培养基:MS+IBA1.0￣3.0+6-BA0.5。培养基(1)和(2)附加30g·L-1蔗糖和8g·L-1琼脂,(3)为不加蔗糖的固体或液体培养基。pH5.8￣6.0。培养温度为20℃,光强约40μmol·m-2·s-1,光照时间12h·d-1。4生长与分化情况4.1无菌材料的获得取菹草苗,用自来水冲洗1￣2h,切去植株的所有根及叶,取上端生长旺盛的茎段,用蒸馏水冲洗2￣3次,用5%H2O2浸…     

稷山矮牡丹腋芽的组织培养

1植物名称稷山矮牡丹(Paeonia suffruacosa Andr.var.spontanea Rehd.). 2材料类别腋芽. 3培养条件以MS为基本培养基.(1)丛生芽诱导与增殖培养基:MS 6.BA 2.0 mg·L-1(单位下同) NAA 0.1-0.2;(2)壮苗培养基:MS;(3)生根培养基:MS IAA 0.2-0.3.上述培养基蔗糖用量30 g·L-1、5.0 g·L-1琼脂,pH 5.8.培养温度(25±1)℃,光照强度40～60 μmol·m-2·s-1,光照时间15 h·d-1.     

茶条槭的组织培养和快速繁殖

1植物名称茶条槭(Acer ginnala Maxim.). 2材料类别嫩茎段. 3培养条件(1)启动培养基:木本培养基 6-BA1.0 mg·L-1(单位下同) 3%蔗糖;(2)增殖和生根培养基:木本培养基 IBA 0.1 3%蔗糖.以上培养基均加0.5%琼脂,pH 5.8.培养温度为(25±2)℃,光照时间12 h·d-1,光强为40μmol·m-2·s-1.     

金叶美国梓的组织培养和快速繁殖

1植物名称金叶美国梓(Catalpa bignoniodes). 2材料类别带腋芽的茎段. 3培养条件(1)诱导芽培养基:1/3MS 6-BA 1.0mg·L-1(单位下同) IBA 0.02 3%蔗糖;(2)增殖培养基:MS 6-BA 1.2 IBA 0.2 3%蔗糖;(3)生根培养基:1/2MS NAA 0.3 1.5%蔗糖.上述培养基均加入6.0 g.L-1倍力凝(一种微生物多糖固化剂),pH 5.8～6.2.培养温度为18～26℃,培养室内全自然光照,光照度100～2 000 lx,光照时间9～13 h.d-1.     

三叶悬钩子的组织培养

1植物名称三叶悬钩子(Rubus delavayi Franch.). 2材料类别腋芽. 3培养条件基本培养基为MS.启动培养基(即初代培养基):(1)MS培养基;继代培养基:(2)MS 6-BA 0.2 mg·L-1(单位下同) NAA 0.1;生根培养基:(3)1/2MS IBA 1.5.以上培养基均附加30%蔗糖和6 g·L-1琼脂,pH 5.8.培养温度为(23±2)℃,光照时间12 h·d-1,光照强度40～50μmol·m-2·s-1.     

野扇花的组织培养和快速繁殖

1植物名称野扇花(Sarcococca ruscifolia Stapf),别名清香桂。2材料类别带腋芽的嫩茎段。3培养条件(1)诱导培养基:MS+6-BA2.0mg·L-1(单位下同)+NAA0.05+LH450;(2)增殖培养基:MS+6-BA0.5+NAA0.01+LH300;(3)生根培养基:1/4MS+NAA0.3+IBA0.2。(1)和(2)培养基均附加3%蔗糖、0.7%琼脂,(3)附加1.5%蔗糖、0.6%琼脂,pH5.8～6.0。培养温度(23±2)℃,光强40μmol·m-2·s-1左右,光照时间12h·d-1(李树丽和石文山2005;李雪等2005)。4生长与分化情况4.1外植体的处理先用洗涤剂将外植体清洗3次,然后在流水下冲洗2～3h。在超净工作台上用0.1…     

基于液—固交替培养的水曲柳快速微繁系统研究

以茎部木质化、叶片老化、顶芽休眠的水曲柳组培苗为材料,开发了一种液体—固体交替培养的水曲柳（Fraxinus mandshurica Rupr.）快速高效的再生系统,该技术通过液体悬浮培养在短时间内使腋芽萌发,并在固体培养中腋芽离体再生获得新的组培苗。在补充不同植物生长调节剂的WPM液体和固体培养基上,可以诱导水曲柳腋芽萌发并伸长成苗。发现在添加了0.6 mg·L^-1 TDZ的WPM液体培养基中暗培养,7~15 d之内可促使水曲柳腋芽100%萌发,将萌发的嫩芽切下后接种到0.05 mg·L^-1 TDZ和0.6 mg·L^-1 BA的WPM固体培养基中光照培养,腋芽在1~2个继代内可以伸长成苗,苗平均高为2.64 cm,增殖系数达到4.04。将生根的苗移栽,50 d后存活率为90%。该技术的建立有助于水曲柳的大规模繁殖,并且液体—固体交替循环培养,简单、可控、易操作,适用于不同的生产条件,减少成本。     

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.