橐吾属一新种

多年生草本。根稍带肉质,较细,疏被短柔毛,茎细瘦,直立,高30～60cm,连同花序密被黄褐色短柔毛夹疏的白色柔毛,基部直径3～6mm,被褐色枯叶柄纤维包围。丛生叶及茎基部叶具短柄,柄长2～4cm,有翅、基部扩大成鞘状,茎中上部叶不具柄而半抱茎;叶片倒宽卵形,卵形或长圆形,长     

中国毛莨科植物小志(九)

多年生低矮草本。根状茎圆柱形,粗约3毫米。茎高约5.5厘米,不分枝,与叶柄均密被开展的白色长和短柔毛及黄色短腺毛,在基部之上有1叶。基生叶约2,具长柄;叶片纸质,轮廓肾形,长1.7—2.3厘米,宽2.8—4.2厘米,基部心形,三裂稍超过中部,中深裂片扇状倒梯形或倒梯形,三浅裂,浅裂片顶端圆或钝,不分裂或有1枚牙齿,侧深裂片轮廓斜扇形,不等二浅裂,上面被近贴伏短柔毛,下面在平的脉上被开展短柔     

中国毛茛科植物小志(九)

多年生低矮草本。根状茎圆柱形,粗约3毫米。茎高约5.5厘米,不分枝,与叶柄均密被开展的白色长和短柔毛及黄色短腺毛,在基部之上有1叶。     

封面说明

<正>西藏杓兰(Cypripedium tibeticum King exRolfe),为兰科杓兰属的多年生草本植物。植株高15~35 cm。茎直立,无毛或上部近节处被短柔毛,基部具数枚鞘,鞘上方具2~4枚叶。叶片椭圆形、卵状椭圆形或宽椭圆形,长8~16 cm,宽3~9 cm,无毛或疏被微柔毛,边缘具细缘毛。茎顶生1花;苞片叶状;花梗和子房长2~3 cm;花大,俯     

广西鱼黄草属一新种

<正> 多年生草本。茎细长,匍匐,上部常缠绕,密被长硬毛。叶椭圆形或卵状披针形,长1.8—5厘米,宽0.8—2.5厘米,全缘,顶端锐尖或近圆形,具短尖头,基部近圆形,浅心形或阔楔形,边缘密被及两面疏被长硬毛,背面脉上毛常较密,侧脉每边3—6条,两面凸起,小脉平行横出,在叶面不显,在叶背明显突起;叶柄长3—8毫米,密被长硬毛。花序的苞叶卵形,基部截形,少为浅心形或近圆形。聚伞花序腋生,具花1—3朵,仅1花能育,花序梗长约5毫米;苞片线形,极小,长2—3毫米;花蕾狭卵形,顶端长渐尖;萼片披针形,近等     

水竹叶属一新种

<正> 多年生水生草本,高达30厘米,具须根;茎匍匐,多分枝,上升,节间1.5—7厘米,粗 1—3 毫米,具条棱,被一列多细胞短柔毛。叶鞘长 5—6 毫米,口部密被多细胞睫毛;叶全部茎生,无毛,心形,稀卵形,长 1—3 厘米,宽 0.8—2 厘米,顶端急尖或钝,基部通常浅心形,抱茎,稀圆形,边全缘,无柄。花通常2—4朵簇生于叶腋;苞片卵状矩圆形,长5—7毫米,宽3毫米,膜质;花梗挺直,长约1.4厘米,果时可达2厘米,被短柔毛,中部行有一关节;萼片绿色,卵形,无毛,长约4毫米,宽约2.5毫     

安徽银莲花属一新种

多年生草本。根状茎圆柱形,长3.4—4.7cm,直径4—7mm,节密集,节间短缩,密生纤维状须根。基生叶全都只1枚,具长柄;叶片纸质,肾状五角形,长2.7—5.5cm,宽4—9cm,叶基深心形,三全裂;中全裂片菱状倒卵形,宽     

四川竹类新分类群

秆高12-14米,直径粗8-10厘米,全秆共有40节,微作之字形曲折,先端直立,节间最长35-38厘米,一般长约30厘米,基部最短节间长约10厘长,圆筒形,绿色,无白粉,无毛,基部2-3节间幼时具黄白色细纵条纹(宽0.2-1毫米)秆壁厚1.5-2.5厘米,髓呈头垢状;箨环隆起,暗褐色,无毛,有时具箨鞘基部之残留物;秆环平;节内宽5-10毫早落,灰褐色,三角形至长三角形,长10-23厘米(约为节间氏度的1/3,基部宽20-30厘米,顶端宽8-16厘米,背面通常无毛(偶有稀疏棕黑色刺毛),纵脉纹显著,上部和两侧的小横脉略明显;算耳显著,不等大,厚纸质,略呈三角形或半圆形,约褶,具脉纹,无毛,易碎落,长召-4厘米,宽1-2厘米,边缘密生黄褐色长卜5毫米微弯曲之遂毛;榨舌略呈圆弧形,灰褐色,纸质,无毛,高1-3毫米,口部密生灰白色纤毛,捧片宽大,卵状三角形,直立,长5.5-16厘米,基部宽10-15厘米,先端渐尖,基部微作圆形收缩,背面无毛,微被白粉,纵脉纹较细而略明显,内面黄褐色至棕黑色,密生小刺毛和刺毛,纵脉纹显著隆起;秆芽圆锥形,不贴主秆,芽鳞无毛或有时具稀疏灰白色小刺毛,纵脉纹明显,边缘具纤毛,分枝低矮,通常于第1-2节即开始分枝,主枝常为3枚,全一民达3米,具15节,节间长6-32厘米,直径粗1-2.5厘米,无毛,无自粉,具有与秆捧性质相同的枝释,主秆下部之小枝不发达而缩短成软刺,小枝具叶5-11枚,叶鞘长5-6.5厘米,淡黄绿色,无毛,有光泽,上部纵脊明显,纵脉纹略可见,边缘密生灰白色纤毛;叶耳缺失,鞘口两肩无继毛,叶舌截平形,黄褐色,无毛,高不及1毫米,口部整齐,外叶舌显著,无毛,光亮,叶片披针形,革质,长12-23厘米,宽1.5-2.5厘米,正面绿色,背面淡绿色,均无毛,先端渐尖,旅部楔形或有时略呈圆形,次脉6-8对,小横脉不发育,边缘一侧具小锯齿而略粗糙,另一侧近于平滑,叶柄长1-3毫米,扁而微扭曲,无毛;花枝未见。笋期6-7月。     

云南姜属一新种

直立草本,高1—1.5m,基部具紫红色的无叶片的叶鞘。上部叶无柄,下部具极短的柄;叶片披针形或狭披针形,长15—32cm,宽5—6.5cm,顶端渐尖或尾尖,基部楔形,叶面绿色,无毛,叶背淡绿色,被稀疏的白色柔毛;基叶椭圆形,长约6.5cm,宽3.2cm,顶端短渐尖,基部近圆形,叶面深绿色,叶背紫红色;叶舌2裂,长4—7mm,     

新种漓江猕猴桃

<正> 大型落叶攀援藤本。幼枝密被淡黄褐色星状短绒毛,尤于枝顶端为甚;二至多年生的枝条毛渐脱落,最后秃净,红褐色至黑褐色,皮孔长圆形,显著;髓心白色至淡褐色,片层状。叶纸质,倒阔卵形至倒卵形或阔卵形,长4.5—12cm,宽4—12.5cm,先端短渐尖或急尖,极少截平并中间凹入,基部心形,边缘具硬质小齿,幼叶腹面被稀薄的星状短绒毛,背面密被淡白色星状短绒毛,老叶两面毛渐脱落,叶脉显著,在背面突起,侧脉6—9对;叶     

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.